JPH09322553A - Power supply device, discharge lamp lighting device, and lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure safety and public standard by reducing inverter output when a discharge lamp fails and controlling output constantly when there is no discharge lamp. SOLUTION: Discharge lamp failure is detected by VL, IL detection circuits 9 and 10, and the presence or absence of the insertion of the discharge lamp is detected by a filament placement detection means 13. When the discharge lamp fails while a discharge lamp 7 is placed, output is reduced to and retained at the output lower limit of an inverter 12 (a first level), the above output reduction/retention is canceled when the discharge lamp 7 is removed, and the output of the inverter 12 is controlled to a constant set value (a second level), thus keeping the unloaded secondary voltage of the inverter 12 to be within a constant value of ±10% (nominal standard) for the scattering of circuit parts when the discharge lamp 7 is removed from the device after the discharge lamp failure is detected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inverter lighting type power supply device, a discharge lamp lighting device and a lighting device having a power factor improving function.

[0002]

2. Description of the Related Art FIG. 43 shows an example of a conventional power supply device. Here, a discharge lamp lighting device using a discharge lamp as a load is shown.

In FIG. 43, reference numeral 1 is, for example, an AC power supply having a commercial frequency. In the power supply device, a full-wave rectifier as a rectifying device 2 is connected to the AC power supply 1 via a power switch SW. This rectifying device 2 is
For example, it is formed of a diode having a high-speed switching property. Two MOS FETs as a pair of switching devices 3 and 4 are connected in series between the output terminals of the rectifying device 2.

The switching device 3 includes a primary winding 6-1 of a leakage type insulation transformer as an inductor 6.
And a series circuit of a capacitor as the first capacitor C1 are connected in parallel.

According to this technical means, the inductor 6
The output circuit is formed at both ends of the. That is, the secondary winding 6-2 of the inductor 6 is used as an output circuit. A discharge lamp 7 as a load, for example, a fluorescent lamp is connected to the secondary winding 6-2. Further, between the filaments of the discharge lamp 7, there is a condenser C3 for filament preheating.
Is connected. In such an example, the leakage inductance of the inductor 6 also acts as the current limiting impedance of the discharge lamp 7.

A second capacitor C2 is connected in parallel to the second switching device 4 via an inductor 6.

Further, the primary winding (control winding) 8-1 of the drive transformer 8 is connected between the discharge lamp 7 and the secondary winding 6-2 of the insulating transformer as the inductor 6.

A series circuit of a resistor R1 and a secondary winding (load winding) 8-2 of the drive transformer 8 is connected in parallel between the gate and source of the switching device 3, and the switching device is connected. 3 is supplied with a gate current. Similarly, a resistor R2 and the drive transformer 8 are provided between the gate and source of the switching device 4.
The secondary winding (load winding) 8-3 and a series circuit are connected in parallel to supply a gate current to the switching device 4.

Secondary winding 8-of the drive transformer 8
2, 8-3 respectively supply a gate current to each switching device 3, 4 based on the current flowing through the primary winding 8-1.

Further, between the output terminals of the rectifying device 2,
A resistor R0 and a capacitor C0 are connected in series to form a time constant circuit, and the connection point between the resistor R0 and the capacitor C0 is connected to the input terminal of the trigger element in the control circuit 5. This configuration constitutes a startup means for supplying a startup trigger signal to the switching device 4 to turn on the switching device 4 when the power switch SW is turned on. The control circuit 5 includes a trigger circuit that generates a start trigger signal and supplies the start trigger signal to the gate of the switching device 4 when the charging voltage of the capacitor C0 reaches a predetermined value during start-up. A circuit having a light receiving portion of a photocoupler PC1 for receiving an abnormality detection signal when an abnormality is detected, and controlling to increase the switching frequency of the switching device 4 constituting the inverter 12 based on the abnormality detection signal. It also has means.

A lamp voltage detection circuit (hereinafter, VL detection circuit) 9 is connected in parallel to the discharge lamp 7, and a lamp current detection circuit (hereinafter, IL detection circuit) 10 is connected in series to the discharge lamp 7. It is connected. The VL detection circuit 9 detects a phenomenon that a current flows in the discharge lamp 7 in only one direction at the end of its life (a half-wave current), or when the discharge lamp 7 is not present. It is a circuit for detecting that the voltage exceeds a predetermined value. IL detection circuit 10
Is composed of a DC detection circuit, and detects when the discharge lamp 7 becomes DC (half-wave current) at the end of its life.

Further, when the VL detection circuit 9 or the IL detection circuit 10 obtains an abnormality detection signal (detection signal of end of life or no discharge lamp), the detection signal is supplied to the latch holding means 11. ing. Latch holding means 1
As long as the inverter 12 is operating, the reference numeral 1 keeps the abnormality detection state based on the detection signal, and the holding current causes the light emitting portion of the photocoupler PC1 to generate an optical signal. An optical signal for abnormality detection from the photocoupler PC provided in the control circuit 5
The light is received by the light receiving section of 1, and the inverter 12
The switching frequency can be increased to suppress the inverter output to a low level. In addition,
The latch holding means 11 is not limited to the secondary side of the inductor 6, and may be provided on the primary side.

Next, the operation of the discharge lamp lighting device configured as described above will be described.

When the power switch SW is turned on, the rectifying device 2
The output voltage of R2 charges the capacitor C0 through R0, and when the charged voltage exceeds a predetermined value, the control circuit 5 generates a start trigger signal and supplies it to the gate of the switching device 4, and the switching device 4 is turned on. When the switching device 4 is turned on, a current flows like the positive output terminal of the rectifying device 2 → the capacitor C 1 → the primary winding 6-1 of the inductor 6 → the switching device 4 → the negative output terminal of the rectifying device 2. As a result, a current flows through the primary winding 8-1 of the drive transformer 8 connected in series with the secondary winding 6-2 of the inductor 6, and the secondary windings 6-2 and 6-3 of the drive transformer 6 are connected.
Currents of opposite polarities flow in the switching devices 3,
4 alternately turns on and off, and self-excited oscillation is reached.

A high-frequency current (several tens of kHz) flows through the primary winding 6-1 of the inductor 6, and the secondary winding 6-
The discharge lamp 7 connected to 2 is lit at high frequency.

On the other hand, when a half-wave current flows at the end of life of the discharge lamp 7, the IL detection circuit 10 or the VL detection circuit 9 is detected.
This is detected by the latch holding means 1 by the detection signal.
Continue to pass the holding current for abnormality detection to 1, and connect the photocoupler PC
The control circuit 5 causes the inverter 12 to turn on by turning on 1
The switching frequency is controlled to control the inverter output.

The reason for limiting the inverter output at the end of its life is (1) protection of the inverter circuit and (2)
It is the protection of the discharge lamp. (1) and (2) will be explained.

(1) When the discharge lamp 7 starts half-wave discharge at the end of its life, the output of the inverter is not AC. Therefore, in the case of the self-excited type, the switching operation is not normal and the switching element generates heat. You Therefore, by reducing the current when the switching element is on,
The switching element is placed in a safe mode and controlled to suppress heat generation.

(2) When the discharge lamp 7 is half-wave discharged, the filament electrode is damaged, and the filament starts abnormal discharge or the emitter which emits thermoelectrons due to overheating abnormally heats up and the filament electrode May bend or fall off to come into contact with the tube wall of the discharge lamp 7, and the discharge lamp 7 may crack. Therefore, the output of the inverter is controlled so as to suppress the heat generation of the filament electrode.

When the discharge lamp 7 reaches the end of its life and does not light up, the lamp voltage rises and the VL detection circuit 9 detects this and the latch holding means 11 carries out an abnormal holding operation, and the photo coupler PC1 is used. The control circuit 5 controls so that the output of the inverter 12 is reduced.

On the other hand, when the discharge lamp 7 as a load is removed from the lighting device (that is, no load is applied) and both ends of the secondary winding 6-2 of the inductor 6 are opened, the drive transformer 8 is opened.
No current flows through the primary winding 8-1, and the outputs of the secondary winding 8-2 and the secondary winding 8-3 of the drive transformer 8 disappear. Therefore, the supply of the gate current to each of the switching devices 3 and 4 is cut off, and the self-oscillation of the inverter 12 is stopped. When the oscillation of the inverter 12 is stopped, the latch holding means 11
The power to turn on is also removed, and the latch operation for abnormality detection is also canceled. Therefore, when the discharge lamp 7 is removed from the lighting device, the stress of the switching devices 3 and 4 can be significantly reduced as compared with the case where the switching operation is performed even under no load due to the oscillation stop of the inverter 12. I have.

Discharge lamp 7 in an abnormal state (half-wave discharge, non-lighting)
If you install a normal discharge lamp in the lighting device after removing the
Since the control circuit 5 has a trigger circuit, the switching devices 3 and 4 are operated to start self-excited oscillation and the discharge lamp is normally lit.

As described above, the above technical means is extremely effective.

The power supply device shown in FIG. 43 is of a type that does not improve the power factor, but the present applicant has previously proposed a technique for improving the power factor in Japanese Patent Application No. 6-178925 as a device of this type. Suggested means.

FIG. 44 shows an example of a power supply device for improving the power factor. 44 is different from FIG. 43 in that the first capacitor C1 is composed of a capacitor having a relatively large capacity such as an electrolytic capacitor,
The primary winding 8-1 of the drive transformer 8 is connected in series with the primary winding 6-1 of the inductor 6. The first capacitor C1 is a smoothing capacitor having a smoothing effect on the output frequency of the rectifier 2. The second capacitor C2 is a resonance capacitor having a relatively small capacitance, and the capacitance of the second capacitor C2 is extremely smaller than the capacitance of the first capacitor C1. At the same time, it resonates at the switching frequency of the switching devices 3 and 4. By disposing the primary winding 8-1 of the drive transformer 8 on the primary side of the inductor 6, the power factor improving effect can be enhanced.

In the device of this construction, when the inverter is operating,
For the rectified voltage charged in the first capacitor C1,
By superimposing the resonance voltage due to the inductance of the inductor 6 and the inductance of the drive transformer 8 on the second capacitor C2, the power supply input current flows even in a low voltage period in the power supply half cycle, and the input power factor is improved.

However, in the apparatus of FIG. 44, the VL detection circuit 9 or the IL detection circuit 10 detects the end of life, and an abnormal holding current flows in the latch holding means 11, causing a photocoupler PC.
Based on the detection signal transmitted through 1, when the control circuit 5 is controlling to throttle the inverter output,
Even if the discharge lamp 7 is removed, since the primary winding 8-1 of the drive transformer 8 is on the primary side of the inductor 6, the oscillation of the inverter 12 is continued and the secondary winding 6- of the inductor 6-
Since the inverter output is output to both ends of the switch 2 and the power for the latch holding means 11 is still obtained by the output, the latch release is not performed. Since the capacitor C3 is removed from both ends of the secondary winding 6-2 when the discharge lamp 7 is removed, this inverter output generated at both ends of the secondary winding 6-2 is very large and dangerous. (Before removing the discharge lamp 7, since the capacitor C3 is connected in series with the inductance of the inductor 6, the voltage generated across the secondary winding 6-2 of the inductor 6 can be suppressed to some extent.)

[0028]

By the way, in the case of the power supply device for improving the power factor as shown in FIG. 44, since the power of the latch holding means is still obtained even if the discharge lamp is pulled out, the latch is not released. The inverter output is held in a controlled state to be suppressed. In addition, even if the discharge lamp is removed, the primary winding of the drive transformer for self-excitation is on the primary side, so it is not possible to automatically detect the presence or absence of the discharge lamp. Even if is installed, the inverter output reduction control is still applied and the power supply switch SW is turned off once to stop the inverter oscillation so that the starting voltage can be regenerated in order to return to normal operation. It is inconvenient because it is necessary to turn on the power switch SW again.

Further, according to the public standards (items for listing the rated secondary voltage) such as the Electrical Appliance and Material Control Law, it is necessary to describe the output voltage of the discharge lamp when it is removed from the lighting device (when there is no load). In some cases, it is required to be within ± 10% regardless of unit variation. However, with the conventional method of reducing the inverter output when the discharge lamp is abnormal (half-wave discharge, non-lighting, etc.), it is difficult to keep the inverter output constant within ± 10% against variations in circuit components. there were.

Therefore, the present invention has been made in view of the above problems.
An object of the present invention is to provide a power supply device, a discharge lamp lighting device, and a lighting device that can realize a reduction in the output of an inverter when a discharge lamp is abnormal, a release of the reduction output when there is no discharge lamp, and a constant output control with a simple configuration. And

[0031]

According to a first aspect of the present invention, there is provided a power supply device including a rectifying device for rectifying the voltage of an AC power supply;
An inverter that converts a rectified voltage from the rectifier into an AC voltage having a frequency higher than the output frequency of the rectifier using a switching device and an inductor; a control circuit that controls the output of the inverter; and an output of the inverter A load to be driven; an abnormality detecting means for detecting an abnormality in the load; a mounting detecting means for detecting mounting of the load; and a control in the case where the abnormality detecting means detects a load abnormality while the load is mounted. Output reduction holding means for reducing the output of the inverter to a lower limit by using a circuit; and when the mounting detection means detects that the load is not mounted, the operation of the output reduction holding means is canceled to turn off the inverter. And a means for controlling the output of the control unit so that the output becomes a set constant value.

According to a second aspect of the present invention, there is provided a power supply device which rectifies the voltage of an AC power supply; the rectified voltage from the rectification device is higher than the output frequency of the rectification device by using a switching device and an inductor. An inverter for converting into an AC voltage; a control circuit for controlling the output of the inverter; a load driven by the output of the inverter; an abnormality detecting means for detecting an abnormality of the load; a mounting detection for detecting mounting of the load Means; if the abnormality detection means detects a load abnormality while the load is mounted, or if the mounting detection means detects that the load is not mounted, the inverter is used by using the control circuit. And a means for controlling the output of the control unit so that the output becomes a set constant value.

According to a third aspect of the present invention, there is provided a power supply device which rectifies the voltage of an AC power supply; first and second switching devices which are connected in series with each other, and which are respectively connected in parallel. First and second capacitors,
The midpoint of the first and second switching devices and the first and second
A high-frequency output inductor and a transformer for driving the first and second switching devices, which are provided in series with the middle point of the second capacitor, wherein the first capacitor is different from the second capacitor. The second capacitor and the inductor are in a relationship of resonating in accordance with ON / OFF of the first and second switching devices, and the first and second switching devices are alternately turned on / off. A self-exciting bridge-type inverter that converts a rectified voltage from the rectifying device into an AC voltage having a frequency higher than an output frequency of the rectifying device; a load driven by the output of the inverter; An abnormality detecting means, which is capable of controlling the switching operation of the first switching device and controlling the output of the inverter, A first control circuit for reducing the output of the inverter to a lower limit based on a load abnormality detection signal from an abnormality detecting means; controlling a switching operation of the second switching device and controlling an output of the inverter. And a second control circuit capable of

According to a fourth aspect of the present invention, there is provided a power supply device which rectifies the voltage of an AC power supply; first and second switching devices which are connected in series with each other, and which are respectively connected in parallel with each other. First and second capacitors,
The midpoint of the first and second switching devices and the first and second
A high-frequency output inductor and a transformer for driving the first and second switching devices, which are provided in series with the middle point of the second capacitor, wherein the first capacitor is different from the second capacitor. The second capacitor and the inductor are in a relationship of resonating in accordance with ON / OFF of the first and second switching devices, and the first and second switching devices are alternately turned on / off. A self-exciting bridge-type inverter that converts a rectified voltage from the rectifying device into an AC voltage having a frequency higher than an output frequency of the rectifying device; a load driven by the output of the inverter; Abnormality detecting means; holding means for latching a load abnormality detection signal from the load abnormality detecting means; switching of the first switching device A first control circuit capable of controlling the operation of the inverter and controlling the output of the inverter, and reducing the output of the inverter to a lower limit based on a load abnormality detection signal from the holding means; And a second control circuit capable of controlling the switching operation of the second switching device and controlling the output of the inverter.

According to a fifth aspect of the present invention, there is provided a power supply device which rectifies the voltage of an AC power supply; first and second switching devices which are connected in series with each other, and which are respectively connected in parallel with each other. First and second capacitors,
The midpoint of the first and second switching devices and the first and second
A high frequency output inductor and a drive transformer of the first and second switching devices, which are provided in series with the middle point of the second capacitor, wherein the first capacitor is different from the second capacitor. And the second capacitor and the inductor are in a relationship of resonating according to on / off of the first and second switching devices, and the first and second switching devices are alternately turned on / off. A self-exciting bridge-type inverter that converts a rectified voltage from the rectifying device into an AC voltage having a frequency higher than an output frequency of the rectifying device; a load driven by the output of the inverter; Abnormality detection means; holding means for latching a load abnormality detection signal from the load abnormality detection means; mounting detection means for detecting load mounting; Means for releasing the latch of the holding means when the wearing detection means detects that the load is not mounted; and controlling the switching operation of the first switching device and controlling the output of the inverter. It is possible to reduce the output of the inverter to the lower limit based on the load abnormality detection signal from the holding means, while the mounting detection means detects that the load is not mounted, the load abnormality is detected. A first control circuit for reducing the output of the inverter to a lower limit on the basis of a load non-mounting detection signal from the mounting detection means instead of the load abnormality detection signal from the detection means; and a switching operation of the second switching device. And a second control circuit capable of controlling the output of the inverter.

In the above description, a voltage detection circuit for detecting a voltage abnormality and / or a current detection circuit for detecting a current abnormality can be used as the abnormality detecting means. As the load, for example, various external loads such as a discharge lamp, a motor, and other rectifying circuits can be connected. Furthermore, the rectifier is preferably a full-wave rectifier that full-wave rectifies the output of the AC power supply.

As the switching device, for example, a field effect transistor can be used. In this case, the parasitic diode built in the field effect transistor due to its structure can be used for reverse current flow. Also, like a bipolar transistor, a switch element without a built-in parasitic diode between the collector and emitter may be the main constituent. In this case, the conduction direction is reversed and the diode is connected in parallel between the collector and emitter. To do.

Further, when the first and second switching devices are alternately turned on and off, it means that there is a period in which both are substantially off while one is turned on and the other is turned off. , You don't have to. The switching frequency of the switching device is higher than the output frequency of the rectifying device, and is preferably several kHz or more,
Furthermore, it is more preferable that the frequency is 20 kHz or higher, which is higher than the audible frequency.

Further, in the above description, "in series" or "in parallel" means to include both cases where other electric components are interposed and cases where they are not interposed.

The inductor may be one that can resonate with the second capacitor, but a leakage type isolation transformer is preferable.

Further, the drive transformer is composed of, for example, a current transformer (saturable reactor).

The invention according to claim 6 is characterized in that the second control circuit in the power supply device according to any one of claims 3 to 5 is provided with adjusting means for determining the output of the inverter. And

According to a seventh aspect of the present invention, the second control circuit in the power supply device according to any one of the third to sixth aspects is configured so that the second control circuit is based on a load abnormality detection signal from the abnormality detection means. It is characterized in that it comprises means for shifting the output of the inverter by one step.

According to an eighth aspect of the present invention, a rectifying device for rectifying a voltage of an AC power source; and a rectifying voltage from the rectifying device is converted into an AC voltage having a frequency higher than an output frequency of the rectifying device by using a switching device. An inverter; first for producing and outputting a DC power supply voltage from the output of the inverter
A power supply circuit; a control circuit which operates by a DC power supply voltage from the first power supply circuit to control the output of the inverter; a plurality of discharge lamps driven by the output of the inverter; A plurality of abnormality detecting means for respectively detecting the abnormalities; a plurality of notification lamps to which a DC power supply voltage from the first power supply circuit is introduced at one end; and a plurality of abnormality detecting means detecting an abnormality, Output reduction holding means for reducing the power supplied to the control circuit from the first power supply circuit to reduce or stop the output of the inverter by turning on the plurality of notification lamps respectively; A second power supply circuit that is provided on the side of the AC power supply and that generates a power supply voltage from the output of the preceding stage that is supplied to the inverter and guides it to one end of the plurality of notification lamps. Characterized by comprising a; If.

According to a ninth aspect of the present invention, a rectifying device for rectifying the voltage of an AC power source; and a rectifying voltage from the rectifying device is converted into an AC voltage having a frequency higher than the output frequency of the rectifying device by using a switching device. An inverter; a power supply circuit that creates and outputs the DC power supply voltage; a control circuit that operates by the DC power supply voltage from the power supply circuit and controls the output of the inverter; and a plurality of drives driven by the output of the inverter A discharge lamp; a plurality of abnormality detecting means for detecting abnormality of each of the plurality of discharge lamps; a plurality of notification lamps to which a DC power supply voltage from the first power supply circuit is introduced at one end; a plurality of abnormality detections When the means detects an abnormality, the power supplied from the power supply circuit to the control circuit is reduced by turning on the plurality of notification lamps. An output reduction holding means for reducing or stopping the output of the inverter; and a system-off circuit for releasing the latch of the ON state of the plurality of notification lamps to the output reduction holding means by a predetermined operation. And

According to a tenth aspect of the present invention, a rectifying device for rectifying the voltage of an AC power source; and a rectifying voltage from the rectifying device is converted into an AC voltage having a frequency higher than the output frequency of the rectifying device by using a switching device. An inverter; a power supply circuit that creates and outputs the DC power supply voltage; a control circuit that operates by the DC power supply voltage from the power supply circuit to control the output of the inverter; and a plurality of drives driven by the output of the inverter A discharge lamp; a plurality of abnormality detecting means for detecting an abnormality of each of the plurality of discharge lamps; a plurality of notification lamps to which a DC power supply voltage from the first power supply circuit is introduced at one end; a plurality of abnormality detections If the means detects an abnormality, the power supplied from the power supply circuit to the control circuit is reduced by turning on the plurality of notification lamps. Output reduction holding means for reducing or stopping the output of the inverter; performing a system-off operation by a predetermined operation to reduce the power supplied from the power supply circuit to the control circuit to reduce or stop the output of the inverter; A system-off circuit for releasing the latching of the plurality of notification lamps in the on state to the output reduction and holding means; and a mounting detection means for detecting mounting of the plurality of discharge lamps. In a case where it is detected that the plurality of abnormality detecting means are not attached, when all of the plurality of abnormality detecting means do not detect an abnormality, the system off circuit is caused to perform a system off operation, and at least one of the plurality of abnormality detecting means is used. A mounting detection control circuit for stopping the system-off operation by the system-off circuit when one detects an abnormality; Characterized in that was.

According to a twelfth aspect of the present invention, there is provided the power supply device according to any one of the first to seventh aspects; and a discharge lamp that is energized by the output of the power supply device. And

According to a twelfth aspect of the present invention, in the discharge lamp lighting device according to the eleventh aspect, the discharge lamp is provided with an impedance element in parallel between the filament terminals.

The thirteenth aspect of the present invention is characterized by comprising a lighting device main body; and the discharge lamp lighting device according to any one of the eighth to twelfth aspects.

According to the first aspect of the present invention, when the load is attached and the load is abnormal, the output is reduced to the output lower limit of the inverter, and when the load is removed from this state, the above output is output. It is possible to release the reduction hold and control the inverter output to a set constant value. As a result, when the load is removed from the device after detecting a load abnormality, the no-load secondary voltage of the inverter can be suppressed to a fixed value within ± 10% (public standard) with respect to variations in circuit components. it can.

According to the second aspect of the present invention, the inverter output can be controlled to the set constant value when the load is attached and the load is abnormal or when the load is not attached. As a result, the inverter output can be suppressed to within ± 10% (public standard) with respect to variations in circuit components both when the load is abnormal and when the load is not attached.

In the third aspect of the present invention, the first control circuit is related to the resonance system and has a characteristic that the frequency changes and the inverter output greatly changes in response to changes in the control level. The circuit is related to the smoothing voltage by the first capacitor, and has a characteristic that the smoothing voltage changes in response to the control level change and the inverter output changes smoothly. When the load is abnormal, the control operation by the first control circuit is stopped to set (reduce) the output to the lower limit, and then the stable output control is performed by the second control circuit.

In the invention of claim 4, when the load abnormality is detected, it can be latched.
Once a load abnormality occurs, the load abnormality detection signal is continuously output, so the control operation by the first control circuit is stopped and the output is continuously reduced to the lower limit, while the stable output setting is performed by the second control circuit. be able to.

According to the fifth aspect of the present invention, a load abnormality can be detected and latched, and when the load is removed in this state, this is detected, the latch is released, and at the same time the load non-attachment detection is performed. Based on the signal, it is possible to maintain the setting of stopping (controlling) the output to the lower limit by stopping the control operation by the first control circuit, and stable output control by the second control circuit is performed.

According to the sixth aspect of the present invention, the second control circuit is provided with a means for adjusting the inverter output, for example, a resistor volume, so that the inverter output can be controlled to a desired constant value under no load.

According to the seventh aspect of the invention, the second switching circuit outputs the second switching circuit by switching the resistance value and the like in the second control circuit using the load abnormality detection signal. The control level of the device can be shifted by one step to control the inverter output by one step. This makes it possible to set the inverter output at the time of load abnormality detection to a lower value.

In the eighth aspect of the present invention, when the output reduction holding means detects an abnormality in the plurality of abnormality detecting means, the plurality of notification lamps are turned on, whereby the first reduction lamp is turned on. Since the power supplied from the power supply circuit to the control circuit is reduced and the output of the inverter is reduced or stopped, the inverter output can be reduced and maintained when the discharge lamp is abnormal, and the first power supply circuit is more effective than the inverter. It is provided on the AC power supply side, and the power supply voltage is created from the output of the previous stage supplied to the inverter and guided to one end of the plurality of notification lamps, so the notification lamps are kept lit even when the inverter is completely stopped. it can.

In the ninth aspect of the present invention, when the output reduction holding means detects an abnormality in the plurality of abnormality detecting means, the plurality of notification lamps are turned on so that the power supply circuit is turned off. Since the power supplied to the control circuit is reduced and the output of the inverter is reduced or stopped, the inverter output can be reduced and held when the discharge lamp is abnormal, and the system-off circuit causes the output reduction holding means to perform a predetermined operation. Since the latches for turning on the plurality of notification lamps are released, the latches for turning on the notification lamps can be released with a simple circuit configuration by turning the power off or operating the remote controller.

According to the tenth aspect of the invention, when the output reduction holding means detects an abnormality in the plurality of abnormality detecting means, the plurality of notification lamps are turned on so that the power supply circuit is turned off. Since the power supplied to the control circuit is reduced and the output of the inverter is reduced or stopped, the inverter output can be reduced and maintained when the discharge lamp is abnormal, and when the discharge lamp is not installed, a plurality of abnormality detection means can be used. When at least one detects an abnormality, the system-off operation by the system-off circuit is stopped, so that the notification lamp can be prevented from being erroneously turned off when the discharge lamp is replaced at the end of its life.

In the discharge lamp lighting device according to claim 11, since the discharge lamp is used as the load of the power supply device according to any one of claims 1 to 7, when the discharge lamp is abnormal, the discharge lamp output can be reduced as much as possible. Moreover, the no-load output can be reduced to a constant value when the discharge lamp is removed. When no load is applied, the inverter output can be suppressed within ± 10% (public standard) with respect to variations in circuit components.

In the discharge lamp lighting device according to the twelfth aspect, since the impedance element is provided in parallel between the filament terminals of the discharge lamp, an excessive output voltage is not generated when the lamp is removed. Further, it is possible to avoid the risk of lamp destruction due to heat generation when the filament is broken.

In the illumination device according to claim 13, since the discharge lamp lighting device according to any one of claims 8 to 12 is provided in the illumination device main body, the discharge lamp output can be reduced as much as possible when the discharge lamp is abnormal. Further, it is possible to realize a lighting device capable of reducing the no-load output to a constant value when the discharge lamp is removed.
When no load is applied, the inverter output can be suppressed within ± 10% (public standard) with respect to variations in circuit components.

[0063]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a power supply device according to a first embodiment of the present invention. Here, a discharge lamp lighting device using a discharge lamp as a load is shown. 41, the same function parts as those in FIG.

In FIG. 1, reference numeral 1 is, for example, an AC power supply of commercial frequency. The power supply device is the AC power supply 1
A full-wave rectifier as the rectifier 2 is connected to the power switch SW. The rectifying device 2 is formed of, for example, a diode having a high-speed switching property.
Two MOS FETs as a pair of switching devices 3 and 4 are connected in series between the output terminals of the rectifying device 2.

The switching device 3 includes a primary winding 6-1 of a leakage type insulation transformer as the inductor 6.
And the primary winding (control winding) 8-1 of the drive transformer 8
And a smoothing capacitor having a relatively large capacity as the first capacitor C1 are connected in parallel. The first capacitor C1 has a smoothing effect on the output frequency of the rectifier 2. The drive transformer 8 is composed of a current transformer (saturable reactor).

In this technical means, the inductor 6
The output circuit is formed at both ends of the. That is, the secondary winding 6-2 of the inductor 6 constitutes an output circuit. A discharge lamp 7 as a load, for example, a fluorescent lamp is connected to the secondary winding 6-2. A condenser C3 for preheating the filament is connected between the filaments of the discharge lamp 7. In such an example, the leakage inductance of the inductor 6 also acts as the current limiting impedance of the discharge lamp 7.

For the second switching device 4, the primary winding (control winding) 8 of the drive transformer 8 is
The second capacitor C2 is connected in parallel via -1 and the inductor 6. The capacity of the second capacitor C2 is extremely smaller than the capacity of the first capacitor C1 and is selected as a value that resonates at the switching frequency of the switching devices 3 and 4 together with the inductance of the inductor 6.

Between the gate and source of the switching device 3, a series circuit of a resistor R1 and a secondary winding (load winding) 8-2 of the drive transformer 8 is connected in parallel,
A gate current is supplied to the switching device 3. Similarly, a series circuit of a resistor R2 and a secondary winding (load winding) 8-3 of the drive transformer 8 is connected in parallel between the gate and the source of the switching device 4, and the switching device 4 is connected to the series circuit. It is designed to supply gate current.

Secondary winding 8- of the drive transformer 8
2, 8-3 respectively supply a gate current to each switching device 3, 4 based on the current flowing through the primary winding 8-1.

Further, between the output terminals of the rectifying device 2,
A resistor R0 and a capacitor C0 are connected in series to form a time constant circuit, and the connection point between the resistor R0 and the capacitor C0 is connected to the input terminal of the trigger element in the control circuit 5. This configuration constitutes a startup means for supplying a startup trigger signal to the switching device 4 to turn on the switching device 4 when the power switch SW is turned on. The control circuit 5 includes a trigger circuit that generates a start trigger signal and supplies the start trigger signal to the gate of the switching device 4 when the charging voltage of the capacitor C0 reaches a predetermined value during start-up, while controlling the lamp voltage or lamp current of the discharge lamp 7. When an abnormality is detected, it has a light receiving portion of a photocoupler PC1 for receiving the abnormality detection signal, and based on the abnormality detection signal, the switching frequency of the switching device 4 constituting the inverter 12 is increased to suppress the inverter output. It also has circuit means for controlling.

Further, the VL detection circuit 9 is connected in parallel to the discharge lamp 7, and the IL detection circuit 10 is connected in series to the discharge lamp 7. The VL detection circuit 9 detects a phenomenon that a current flows in the discharge lamp 7 in only one direction at the end of its life (a half-wave current), or when the discharge lamp 7 is not present. It is a circuit for detecting that the voltage exceeds a predetermined value. The IL detection circuit 10 is
It is composed of a DC detection circuit, and detects when the discharge lamp 7 becomes DC (half-wave current) at the end of its life.

Further, when the VL detection circuit 9 or the IL detection circuit 10 obtains an abnormality detection signal (end-of-life detection signal), the detection signal is supplied to the latch holding means 11A. As long as the inverter 12 is operating, the latch holding means 11A continues to hold the abnormality detection state based on the detection signal, and the holding current causes the light emitting portion of the photocoupler PC1 to generate an optical signal.
When the filament mounting means 12, which will be described later, detects that there is no filament, that is, there is no discharge lamp 7, the holding current is turned off by the detection signal to release the latch, and at the same time, the control circuit 5 is controlled to make the inverter output constant. At the end of the life of the discharge lamp 7, the optical signal for detecting the abnormality from the latch holding means 11A is received by the light receiving portion of the photocoupler PC1 provided in the control circuit 5, and by this, The switching frequency of the inverter can be increased to suppress the output of the inverter to a low level. On the other hand, when the discharge lamp 7 is pulled out from this state, the holding current is turned off by the detection signal of no filament to release the latch and the control circuit is simultaneously released. 5 is controlled so that the inverter output is kept constant. The latch holding means 11 is not limited to the secondary side of the inductor 6 and may be provided on the primary side.

Further, each filament 7 at both ends of the discharge lamp 7
Terminals a and b to which the electrodes of the filaments 7-1 and 7-2 are attached so that capacitors C4 and C5 as impedance elements can be connected in parallel to -1, 7-2, respectively.
With the configuration in which the capacitors C4 and C5 are connected in parallel to the terminals c and d, respectively, when the discharge lamp 7 is removed from the lighting device, an excessive voltage does not appear at both ends of the secondary winding 6-2 of the inductor 6. In this way, a highly safe configuration is provided.

Furthermore, in the present embodiment, the electrode terminals a of the filaments 7-1 and 7-2 at both ends of the discharge lamp 7 are
b, the filament mounting means 13 is connected in parallel to one of the terminals c and d (or the terminals a and b) of the terminals c and d,
The detection signal when the filament mounting means 13 detects the presence of the filament is supplied to the latch holding means 11A. When the latch holding means 11A receives the filament detection signal, the latch holding means 11A performs the above-mentioned latch release and constant output control.

Next, the operation of the discharge lamp lighting device configured as described above will be described.

When the power switch SW is turned on, the rectifying device 2
The output voltage of 1 charges the capacitor C0 through the resistor R0, and when the charged voltage exceeds a predetermined value, the control circuit 5 generates a start trigger signal and supplies it to the gate of the switching device 4, and the switching device 4 is turned on. When the switching device 4 is turned on, the positive output terminal of the rectifying device 2 → the capacitor C 1 → the primary winding 6-1 of the inductor 6 → the primary winding 8-1 of the drive transformer 8 → the drain / source of the switching device 4 → rectification The current flows like the negative output of the device 2. As a result, the primary winding 8 of the drive transformer 8 connected in series with the secondary winding 6-1 of the inductor 6
-1 causes a current to flow, and the secondary winding 6 of the drive transformer 6-
Currents having polarities opposite to each other flow in 2 and 6-3, the switching devices 3 and 4 are alternately turned on and off, and self-oscillation is reached.

A high-frequency current (several tens of kHz) flows through the primary winding 6-1 of the inductor 6, and the secondary winding 6-
The discharge lamp 7 connected to 2 is lit at high frequency.

FIG. 2 shows the discharge lamp 7 at the end of its life.
3 shows the change over time of the lamp voltage VL.

When the discharge lamp 7 reaches the end of its life and a half-wave current flows or becomes unlit, the lamp voltage VL rises as shown in FIG. 2 (a), and if this state continues for a certain period, IL
This rise in VL is detected by the threshold value Vr set in the detection circuit 10 or the VL detection circuit 9, and a holding current indicating that an abnormality has been detected is continuously supplied to the latch holding means 11A by the detection signal, and the current is kept. By illuminating the photocoupler PC1 by the control circuit 5, the control circuit 5 controls the switching frequency of the inverter 12 to be high so that the inverter output voltage, that is, the voltage across the secondary winding 6-2 of the inductor 6 is reduced. As a result, the lamp voltage VL across the discharge lamp 7
Is narrowed down to a low level voltage V1 which is close to that during normal lighting, as shown in FIG. 2 (b). This low voltage V1 is at or near the lower limit voltage of the inverter output. At this time, the current flowing through the discharge lamp 7 is extremely small due to the lamp voltage VL being controlled to a level close to the lower limit, and may be in a half-wave discharge state. It gets very dark. In this state, when the user pulls out the discharge lamp 7, the filament attachment detecting means 12
Detects this and transmits it to the latch holding means 11A, whereby the latch holding means 11A controls the latch release and the inverter output voltage to be constant. That is, the lamp voltage VL is controlled so as to have a constant value V2 as shown in FIG. After that, when the normal discharge lamp 7 is mounted, the filament mounting means 13 informs the latch holding means 11A of the filament mounting, and releases the constant output control while maintaining the latch release. As a result, the time constant circuit of the resistor R0 and the capacitor C0 and the trigger circuit in the control circuit 5 are activated, and the starting voltage from the control circuit 5 is the switching device 4,
2, the switching devices 3 and 4 start self-excited oscillation, and the output voltage of the secondary winding 6-2 of the inductor 6, that is, the lamp voltage VL instantly rises as shown in FIG. 2 (d). , The discharge lamp 7 is normally turned on. After lighting, high-frequency lighting is performed at a normal lamp voltage V3 as shown in FIG. 2 (e).

FIG. 3 shows a specific circuit example of the power supply device shown in FIG. 1 and 3 indicate the same circuit or element. In the figure, the switching device 3, the resistor R1, the drive secondary winding 8-2, which is located in the upper stage of the inverter 12,
And the capacitor C1 on the high side (hereinafter referred to as the H side),
The switching device 4, the resistor R2, the drive secondary winding 8-3, and the capacitor C2 located in the lower stage are called the low side (hereinafter referred to as the L side).

Between the output terminals of the rectifying device 2 is a time constant circuit consisting of a series circuit of a resistor R0 and a capacitor C0. A series circuit of a PNP transistor Q1 and a capacitor C6 is connected to both ends of the capacitor C0, and a transistor Q1 is connected. A Zener diode ZD3 is connected between the base and the negative output terminal of the rectifier 2. Therefore, when the voltage between the output terminals of the rectifying device 2 is high at the time of start-up or at the end of life, the charging voltage of the capacitor C0 also becomes high, and when the Zener voltage of the Zener diode ZD3 is exceeded, the transistor Q1 turns on. The voltage determined by the Zener voltage is output across the capacitor C6. This output voltage Vcc acts as a control voltage for controlling the control circuit 5 at the time of startup or the end of life.

The collector / emitter of the phototransistor of the photocoupler PC1 forming the safety circuit 5A is connected in parallel to both ends of the output capacitor C6 of the control power supply 14, and the resistor R3 and the resistor volume VR with a sliding terminal, And a series circuit of a resistor R4 is connected in parallel.
The voltage obtained at the sliding terminal of the volume VR is supplied to the gate of the MOS FET 15 used as a variable resistor, and between the sliding terminal of the volume VR and the negative output terminal of the rectifier 2. , And a capacitor C7 for supplying the gate voltage is connected. MOS FET15
Is connected to the cathode of the diode D1 via the resistor R5, and the anode of the diode D1 is connected to the gate of the MOS FET constituting the switching device 4 via the resistor R2. Resistor R3, resistor potentiometer VR with sliding terminal, resistor R4, capacitor C7, MOS FE
T15, the resistor R5, and the diode D1 form an L-side control circuit 5L.

Further, the voltage Vcc of the output capacitor C6 of the control power supply 14 is supplied to the base of the switching transistor Q0 via the resistor R7. The collector of the transistor Q0 is connected to the negative output terminal of the rectifier 2, the emitter of the transistor Q0 is connected to the anode of the diode D2 via the resistor R6, and the diode D2 is connected.
The cathode of is connected to the gate of a MOS FET that constitutes the switching device 4 via a resistor R2. Resistance R
6, resistor R7, transistor Q0, and diode D2
Constitute an H-side control circuit 5H.

In the L-side control circuit 5L described above, when the potential on the gate side of the secondary winding 8-3 of the drive transformer 8 is positive, the diode D1 is turned on and the resistor R5 and the MOS FET 15 are turned on. The resistance between the drain and the source will be connected in series. In addition, the H side control circuit 5
H is when the potential on the gate side of the secondary winding 8-3 of the drive transformer 8 is negative (in other words, the potential on the gate side of the secondary winding 8-2 of the drive transformer 8 is positive. At some point, diode D2 will conduct and resistor R6 will be connected.

Safety circuit 5A, L-side control circuit 5L, and H
In the control circuit 5 composed of the side control circuit 5H, when the lamp voltage VL rises at the end of the life and the light emitting portion of the photocoupler PC1 is illuminated, the light receiving portion of the photocoupler PC1, that is, the safety circuit 5A is short-circuited. MO of L side control circuit 5L
The SFET 15 turns off, and the transistor Q0 of the H-side control circuit 5H turns off. That is, when the lamp voltage VL rises,
Both the control circuits 5L and 5H are turned off, and at this time, the output voltage of the inverter 12 is reduced (throttled) to almost the lower limit. On the other hand, in the case of a normal discharge lamp, the power switch SW
When the power is turned on, the Zener diode ZD3 from the control power supply 14
Is supplied to the control circuit 5, and this voltage causes the switching transistor Q0 of the H-side control circuit 5H.
Is turned on and the MOS FE of the L side control circuit 5L is
The variable resistance value due to T15 is set small. At this start, the H-side control circuit 5H controls the resistance R5 and the MOS FET1.
5 becomes a resistance circuit, and the L side control circuit 5L has a resistance R6.
The output voltage of the inverter 12 rises, the secondary side voltage of the inductor 6 rises, and the discharge lamp 7
To turn on.

A series circuit of capacitors C9 and C10 and a resistor R9 is connected in parallel to both ends of the secondary winding 6-2 of the inductor 6, and a connection point between the capacitors C9 and C10 and a connection point between the capacitor C10 and the resistor R9. Between the capacitor C9,
A voltage obtained by dividing the lamp voltage VL is derived by the series circuit of C10 and resistor R9. The resistance R9 has a small resistance value. This voltage is supplied to the VL detection circuit 9 described below. In the VL detection circuit 9, capacitors C9 and C1
A voltage obtained by dividing the lamp voltage VL by a series circuit of 0 and a resistor R9 is converted into a direct current by a rectifying / smoothing circuit composed of a clamping diode D4, a rectifying D5, a smoothing capacitor C11 and an output resistor R10, and then the resistance is changed. PUT through R11
While being supplied to the anode of (programmable unijunction transistor), the cathode of the Zener diode ZD1 and the PU are connected through resistors R11 and R12.
It is supplied to the gate of T together. The Zener diode ZD1 and the light emitting diode of the photocoupler PC1 form a safety circuit holding means. Zener diode ZD
The Zener voltage of 1 determines the threshold value for VL detection. The anode of the Zener diode ZD1 is
Connected to the connection point of the capacitor C10 and the resistor R9,
The cathode of the PUT is connected to the anode of the light emitting diode which is the light emitting portion of the photocoupler PC1, and the cathode of the light emitting diode is connected to the connection point of the capacitor C10 and the resistor R9. Therefore, at the end of life, the discharge lamp 7
When the lamp voltage VL rises, the smoothing capacitor C11
When the smoothed voltage obtained at the voltage exceeds the Zener voltage of the Zener diode ZD1, the Zener diode ZD1 becomes conductive and the gate of the PUT is set to the Zener voltage of ZD1.
T turns on and the light emitting diode of the photocoupler PC1 also turns on. Once the PUT is turned on, the holding current continues to flow, thereby latching that the lamp voltage is in the abnormal detection state. While the PUT is performing the latch operation, the holding current keeps the photocoupler PC1 shining.

The voltage obtained at the smoothing capacitor C11 is the collector / emitter of the phototransistor which is the light receiving portion of the photocoupler PC2 and the Zener diode ZD2.
Through the cathode of the PUT and the photocoupler PC1
It is connected to the connection point with the light emitting diode. The Zener voltage of the Zener diode ZD2 is set to a constant value lower than the Zener voltage of the Zener diode ZD1. The phototransistor of the photocoupler PC2 receives the light detection signal from the light emitting diode which is the light emitting portion of the photocoupler PC2 in the filament mounting means 13 when the filament mounting means 13 described later detects no filament (that is, no discharge lamp). And conduct. VL rises due to the abnormality of the discharge lamp 7, and the PUT and the photocoupler P
When the discharge lamp 7 is pulled out while C1 is on, the photocoupler PC2 turns on, the Zener diode ZD2 also conducts, and the current flowing through PC2 and ZD2 increases more than the current flowing through PUT. The holding current flowing through the PUT decreases and the PUT turns off. That is, PUT
The latched state for abnormality detection is released. Along with this, the current flowing in the light emitting portion of the photocoupler PC1 also tries to be turned off, and the collector of the light receiving portion (phototransistor) of the photocoupler PC1 forming the safety circuit 5A in the control circuit 5
The emitters are opened, and the safety circuit operation (that is, the operation of reducing the inverter output) is about to be canceled. At the same time, the inverter output voltage tries to rise, but since the photocoupler PC2 is turned on and the zener diode ZD2 is also conducting, a current defined by the zener voltage of ZD2 flows through the light emitting diode of the photocoupler PC1. The safety circuit 5A in the control circuit 5 works to try to throttle the inverter output again. As a result, the inverter output voltage, that is, the lamp voltage VL of the discharge lamp 7, becomes V2 as shown in FIG. 2 (c).
It is controlled to be constant at the level of. This constant value V
2 is a value determined by the Zener voltage of the Zener diode ZD2, whereby the lamp voltage VL when there is no discharge lamp 7 (when there is no load) can be suppressed within ± 10%. The phototransistor of the photocoupler PC2 and the Zener diode ZD2 constitute a latch release and constant output control means.

Further, one end of the secondary winding 6-2 of the inductor 6 is connected in series to one filament 7-2 of the discharge lamp 7 via the capacitor C8, and a high frequency wave for lighting the discharge lamp 7 is generated. The output of the inverter is supplied to the discharge lamp 7 through this capacitor C8. And
One end of the secondary winding 6-2 of the inductor 6 is connected to the connection point between the capacitor C10 and the resistor 9 through the resistor R8, while one end of the secondary winding 6-2 of the inductor 6 is connected through the diode D3. Is connected to the positive output terminal of the smoothing capacitor C11 (that is, the collector of the photocoupler PC2). The positive output terminal of the smoothing capacitor C11 is connected to one end (terminal c) of the discharge lamp 7 via a clamping diode D6. Resistors R8, R9 and diode D3
Constitute the IL detection circuit 10. With such a configuration, when the discharge lamp 7 is half-wave discharged and a direct current (half-wave current) flows from one end of the inductor 6 through the series circuit of the resistor R8 and the resistor R9, the secondary winding of the inductor 6 Line 6-
At one end of 2, a DC voltage is generated by resistors R8 and R9,
This is added to the VL detecting zener diode ZD1 through the diode D3 and the resistors R11 and R12, and when the threshold voltage Vr for detecting VL (that is, the zener voltage of ZD1) is exceeded, ZD1 becomes conductive and determines the gate voltage of the PUT. , PU
When a potential difference is generated between the anode and the gate of T, PUT is turned on, a latch current indicating abnormality detection is passed, the light emitting part of the photocoupler PC1 is illuminated, and the light receiving part of the photocoupler PC1 which is the safety circuit 5A is turned on. As a result, the control circuit 5 controls the output of the inverter to the lower limit. This inverter output reduction control is the same as in the case of the VL detection circuit 9.

Further, the filament mounting means 13 is connected in parallel with the terminals c and d to which one filament electrode 7-2 of the discharge lamp 7 is connected. Filament mounting means 1
3 is a series circuit of a resistor 13 and a diode D7 connected in parallel between terminals c and d, and a series circuit of a resistor 15 and a resistor 14 is connected in parallel. Are connected in parallel. With this configuration, when the filament 7-2 of the discharge lamp 7 is attached to the terminals c and d,
Since the input terminals of the filament mounting means 13 are short-circuited by the filament, the light emitting diode of the photocoupler PC2 is off and no light emitting current flows. When the filament 7-2 of the discharge lamp 7 is not attached to the terminals c and d, the high frequency voltage generated across the capacitor C5 provided between the terminals c and d is the diode D7.
Rectified and smoothed by the capacitor C13, and the smoothed voltage is applied to both ends of the light emitting diode of the photocoupler PC2,
The PC2 is made to illuminate, thereby operating the output constant control means of the latch holding means 11A. That is, the phototransistor of PC2 is turned on, and the inverter output, that is, the lamp voltage VL, is changed to the Zener diode ZD as shown in FIG. 2 (c).
It is controlled so that it becomes a constant value V2 determined by 2.

As described above, in the embodiment described with reference to FIGS. 1 to 3, when the end of the life is reached due to the presence of the lamp, the VL detection circuit 9 or the IL detection circuit 10 detects this, and the light emitting portion of the photocoupler PC1. Is turned on and the light receiving section is turned on to control both the L-side control circuit 5L and the H-side control circuit 5H to the maximum extent so as to reduce the inverter output to the lower limit. Further, when the lamp voltage VL when there is no lamp is controlled to a constant value V2, the latch release and constant output control means provided in the latch holding means 11A is used. The fixed value V2 of the lamp voltage VL when there is no lamp is determined by
Specifically, it was a Zener diode ZD2.

On the other hand, in the embodiments shown in FIGS. 4 to 9 below, when the end of life is reached due to the presence of a lamp, the VL detection circuit 9 or the IL detection circuit 10 detects this and the photo coupler By illuminating the light emitting portion of PC1 and turning on the light receiving portion thereof, the inverter output is reduced by controlling only the H side control circuit 5H to the lower limit while leaving the control of the L side control circuit 5L. is there.

FIG. 4 shows a power supply unit according to the second embodiment of the present invention. FIG. 5 shows a specific circuit example.

FIG. 4 shows only the schematic configuration of the second embodiment. When the end of life of the discharge lamp 7 is detected by the VL and IL detection circuits 9 and 10, only the H side control circuit 5H that controls the H side of the inverter 12 is controlled to the lower limit to reduce (throttle) the inverter output. The L-side control circuit 5L for controlling the L-side is controlled to be preset. Of course, when the discharge lamp 7 is normally turned on, the H-side control circuit 5H and the L-side control circuit 5 are
Both L perform a normal control operation to control the output of the inverter 12 and control the lamp current of the discharge lamp 7 to be the rated power. This power adjustment during normal lighting can be performed by adjusting and fixing the resistance value or the like in the control circuits 5H and 5L in advance for each power supply device.

In this way, when the lamp abnormality is detected, H
The control operation of only the side control circuit 5H is stopped and the control operation of the L side control circuit 5L is left because the L side control circuit 5L can determine the smoothed DC voltage by the capacitor C1. Is. That is, in the inverter 12, when the L-side switching device 4 is turned on, the rectifying device 2 causes the capacitor C1, the primary winding 6-1 of the inductor 6, the primary winding 8-1 of the drive transformer 8,
A current flows like the switching device 4, and the smoothing voltage by the capacitor C1 is changed depending on the gate voltage control of the switching device 4, and the voltage change rate gives a smooth change by the control signal. In the H-side control circuit 5H, when the H-side switching device 3 is turned on, current flows from the rectifying device 2 to the switching device 3, the primary winding 8-1 of the drive transformer 8, the primary winding 6-1 of the inductor 6, and the capacitor C2. As described above, the frequency of the resonance system changes greatly depending on the control of the gate voltage of the switching device 3. In the inverter 12, the relationship between the frequency and the change rate of the output voltage is such that the output voltage changes greatly even if the frequency is changed slightly. Therefore, the control range can be wide, but the output voltage must be controlled to obtain a constant output. Variation tends to increase. Therefore, when it is attempted to suppress the inverter output to a low constant value when the lamp voltage becomes abnormally high, the H-side control circuit 5
The control operation of H is stopped to narrow the output, and the stable inverter control operation by the L-side control circuit 5L is performed. As a result, even when the lamp voltage or lamp current is abnormal, the inverter output can be reduced to a constant value, and the reduced output voltage can be suppressed within ± 10% with respect to the circuit variation.

Referring to FIG. 5, when an abnormal value of VL or IL is detected by the VL detection circuit 9 or the IL detection circuit 10, the Zener diode ZD1 becomes conductive and PUT becomes conductive, and the photocoupler PC1 shines. The base of the switching transistor Q0 in the H side control circuit 5H
The switching transistor Q0 is turned off by short-circuiting the collector and emitter of the phototransistor of the photocoupler PC1 connected between the emitters. Thus, when a lamp abnormality is detected, only the H-side control circuit 5H can be controlled to the lower limit to operate so as to reduce the inverter output. In the L-side control circuit 5L, constant output control is performed by determining the gate voltage of the MOS FET 15 as a variable resistance by the resistance division ratio of the resistors R3 and R4 connected in series.

FIG. 6 shows a power supply device according to a third embodiment of the present invention. FIG. 7 shows a specific circuit example.

6 and 7 are different from FIGS. 4 and 5 in that the gate voltage of the MOS FET 15 in the L-side control circuit 5L is connected in series to the resistance division ratio of the resistance R3, the resistance volume VR, and the resistance R4. By adjusting the sliding terminal of the volume VR, the inverter output when the lamp abnormality is detected, that is, the lamp voltage can be adjusted to a desired constant value. Others are the same as the case of FIG. 4 and FIG. 5, and when the lamp abnormality is detected, the control operation of the H side control circuit 5H is stopped and only the H side control circuit 5H is controlled to the lower limit to reduce the inverter output. Let it work as you would.

FIG. 8 shows a power supply device according to a fourth embodiment of the present invention. FIG. 9 shows a specific circuit example.

8 and 9, the points different from FIGS. 6 and 7 are that the gate voltage of the MOS FET 15 in the L-side control circuit 5L is the resistance division ratio of the resistance R3, the resistance volume VR, and the resistance R4 connected in series. Besides,
Both ends of the resistor R4 can be short-circuited by a collector-emitter path of a phototransistor which is optically coupled to the light emitting portion of the photocoupler PC1. VL and IL detection circuits 9 and 1
The abnormality detection signal of 0 is used not only as the H control operation stop signal but also as the level shift signal of the resistance voltage dividing ratio. Others are the same as those in FIGS. 6 and 7, and the control operation of the H-side control circuit 5H is stopped when a lamp abnormality is detected, and only the H-side control circuit 5H is controlled to the lower limit to reduce the inverter output. Let it work as you would. Therefore, since only the control operation by the L-side control circuit 5L may occur, the inverter output voltage may become too high. Therefore, in order to control the output voltage to a lower value, the resistance value is switched. Even after the resistance value is switched, the inverter output when the lamp abnormality is detected, that is, the lamp voltage, can be further adjusted to a desired constant value by adjusting the sliding terminal of the resistance volume VR.

As described above, in the embodiment described with reference to FIGS. 4 to 9, when the end of life is reached due to the presence of the lamp, the VL detection circuit 9 or the IL detection circuit 10 detects this and the light emitting portion of the photocoupler PC1. Is turned on and the light receiving section is turned on, so that the control of the L-side control circuit 5L is left,
It has been attempted to reduce the inverter output by controlling only the H side control circuit 5H to the lower limit.

On the other hand, in the embodiments shown in FIGS. 10 to 18 below, when the end of life is reached with a lamp, this is detected by the VL detection circuit 9 or the IL detection circuit 10 and the photocoupler is detected. By turning on the light-emitting portion of PC1 and turning on the light-receiving portion thereof, only the H-side control circuit 5H is controlled to the lower limit to reduce the inverter output while the control of the L-side control circuit 5L is left, and there is no lamp. At this time, in order to control the lamp voltage VL to a constant value within ± 10% with respect to the circuit variation, the filament attachment detecting means 13
By detecting the absence of the lamp with, the light emitting portion of the photocoupler PC1 is made to illuminate and the light receiving portion is turned on similarly to the end of life with the lamp, and the control of the L side control circuit 5L is left. As it is, only the H side control circuit 5H is controlled to the lower limit to reduce the inverter output to a constant value. In this case, the means for controlling the output when there is a lamp and the end of the life is the same as the means for controlling the output when there is no lamp, and the control operation of the H side control circuit 5H is stopped and the L side control circuit is stopped. It is controlled so as to have a constant value only by the control operation of 5 L. That is, what sets the lamp voltage VL to the constant value V4 is specifically the level shift operation and resistance volume adjustment by the L-side control circuit 5L.

FIG. 10 shows a power supply unit according to the fifth embodiment of the present invention.

In FIG. 10 and FIG. 11, VL and IL
The lamp abnormality detection signals from the detection circuits 9 and 10 are used as the H control operation stop signal to the H side control circuit 5H and the L side control circuit 5
Not only is it used as a level shift signal to L, but unlike FIG. 8 and FIG. 9, a filament mounting detection means 13 is provided, and no lamp is detected regardless of whether or not the discharge lamp 7 is abnormal. In this case, the lamp non-detection signal from the filament attachment detecting means 13 is used as an H control operation stop signal to the H side control circuit 5H and a level shift signal to the L side control circuit 5L.

In such a structure, as shown in FIG. 11 (a), when VL rises and exceeds the threshold value Vr of the VL detection circuit 9 or the IL detection circuit 10 at the end of life,
When this is detected, the control operation of the H-side control circuit 5H is stopped by the detection signal and the output is controlled so as to be narrowed down to the lower limit, and the control operation of the L-side control circuit 5L is reduced by one step to a constant value. To control. As a result, the lamp voltage VL
Is narrowed down to a constant value V4 as shown in FIG. 11 (b). Even if the discharge lamp 7 is removed from this state, this is detected by the filament attachment detection means 13, and the detection signal outputs the same operation as described above, that is, the control operation of the H-side control circuit 5H is stopped and the output is narrowed down to the lower limit. L side control circuit 5
The control operation of L is controlled so that the output is reduced by one step and becomes a constant value. As a result, the lamp voltage VL continues to have a constant value V4 as shown in FIG. 11 (c). After that, when the normal discharge lamp 7 is mounted, the filament mounting detection means 13 detects the presence of the lamp, and the H control operation stop signal and the level shift signal disappear by this detection, so the H side control circuits 5H, L side The control circuit 5L returns to the normal control state, and when the lamp is mounted, a high starting voltage is output from the inverter 12 and the discharge lamp 7 is lit at the time of starting, as shown in FIG. 11 (d). After the discharge lamp is normally turned on, VL becomes a substantially constant value V3.

FIG. 12 shows a specific circuit example of FIG.

The circuit of FIG. 12 differs from the circuit of FIG. 9 in that the H-side control circuit 5H and the L-side control circuit 5L have different configurations, and that the starting circuit 16 is provided in the preceding stage of the inverter 12. The latch holding means 11A in the latter stage of the VL and IL detection circuits 9 and 10 has a latch function for latching an abnormal lamp state, and also releases the latch by removing the lamp and releases the latch for shifting to the control operation when there is no lamp. It has a function and a filament attachment detecting means 13 is provided.

The H-side control circuit 5H includes the latch holding means 11
The photocoupler PC1 of A has a phototransistor which is a light receiving part for the light emitting part, and a series circuit of resistors R31 and R32 is connected in parallel to both ends of the output capacitor C6 of the control power supply 14, and the phototransistor is connected to both ends of the resistor R31. The collector and emitter are connected in parallel, and resistors R31 and R32 are connected.
The connection point of is connected to the base of PNP transistor Q31,
The emitter of Q31 is connected to the positive output terminal of the capacitor C6, the collector of Q31 is connected to the base of the NPN transistor Q32 via the resistor R33, and the collector of Q32 is connected to the negative output terminal of the capacitor C6. The emitter of Q32 is connected to the gate circuit of the switching device 4 through the parallel circuit of the resistor R34 and the capacitor C31 and further through the diode D31.

The L-side control circuit 5L has a series circuit of a resistor R42, a collector / emitter of a PNP transistor Q42, and a resistor R43 connected in parallel across the output capacitor C6 of the control power supply 14, and a base of Q42 and a negative electrode of the capacitor C6. A series circuit of a variable resistor VR41 and a resistor 43 and a parallel circuit of a capacitor C42 are connected between the output terminal and the output terminal, and the base of Q42 is connected to the positive output terminal of the rectifier 2 via the resistor R20. Is connected to the base of NPN transistor Q41,
The emitter of Q41 is connected to the negative output terminal of the capacitor C6, the collector of Q41 is connected to the negative output terminal of the capacitor C6 via the capacitor C41, and is connected to the gate circuit of the switching device 4 via the diode D41.
The collector and emitter of the phototransistor of the photocoupler PC1 are connected in parallel with the resistor R44, and the resistance value of the series circuit of the volume VR41 and the resistor R44 is switched by turning the phototransistor on and off, whereby the L-side control circuit 5L. The control can be shifted by one level.

The starter circuit 16 connects a series circuit of a resistor R21 and a capacitor C21 between the output terminals of the rectifier 2,
The connection point between the capacitor 21 and the capacitor C21 is connected to the gate circuit of the switching device 4 via the diac as the trigger element TR and the resistor R21 in series, while it is connected to the connection point of the switching devices 3 and 4 via the diode D21 and the resistor R22. are doing.

The latch function of the latch holding means 11A is PU
It is composed of a series circuit of T and a light emitting diode of the photocoupler PC1, and the latch release function supplies the detection voltage by the smoothing capacitor C11 of the VL and IL detection circuits 9 and 10 to the collector of the phototransistor of the photocoupler PC2. The emitter of the phototransistor is connected to the connection point between the PUT and the light emitting diode of the photocoupler PC1.

The filament mounting means 13 has terminals c and d.
Connect a series circuit of resistor 13 and diode D7 in parallel between
Further, a series circuit of a resistor 14 and a capacitor C13 is connected in parallel, and a resistor 15 and a light emitting diode of a photocoupler PC2 are connected in parallel to both ends of the capacitor C13.

In the configuration of FIG. 12, when the power switch SW is turned on, the capacitor C0 of the control power supply 14 is charged and the power is supplied to the control circuits 5H and 5L, while the starting circuit 1
When the capacitor C21 of 6 is charged and its charging voltage exceeds the breakover voltage of the trigger element TR, the trigger element TR becomes conductive and supplies a gate current to the switching device 4 to turn on the switching device 4. As a result, from the positive terminal of the rectifier 2 to the capacitor C1 and the inductor 6
Primary winding 6-1, primary winding 8 of drive transformer 8
1, a current flows through the switching device 4 and the negative terminal of the rectifying device 2, and when the primary winding 8-1 of the drive transformer 8 is saturated, the polarity of the current changes, and the switching devices 3 and 4 alternately turn on and off to oscillate. Start. The drive transformer 8 is composed of a current transformer (saturable reactor). Simultaneously with the start of oscillation of the inverter 12, the power supply voltage Vcc is also supplied from the control power supply 14 to the H-side control circuit 5H and the L-side control circuit 5L, so that the transistors Q31 and Q32 are turned on and the transistors Q42 and Q41 are turned on. Diode D3 in each gate circuit of devices 4 and 3
The output voltage of the inverter 12 rises by connecting the resistor R41 and the resistor R31 via 1 and D41. As a result, the discharge lamp 4 connected to the secondary winding 6-2 of the inductor 6
A high output voltage is supplied to the discharge lamp 7 at startup, and the discharge lamp 7 is turned on.

For each power supply unit, even if the discharge lamp 7 is for 60 W, for example, when the lamp is normally lit, the lamp current will vary depending on the variation of the parts of the inverter circuit. , L side control circuit 5L
A resistance volume VR41 is provided in the. By adjusting this VR41, in the case of 60 W, it is possible to adjust the lamp current variation for each unit so that 60 W output can be obtained. In FIG. 13 (a), two types of units 1 and 2 are used.
The adjustment of the case where the lighting output WL has a variation based on the circuit variation is shown. The variation in the lighting output WL can be adjusted to a desired value of 60 W by changing the resistance value of VR41. In the unit 1, VR41 is set to 10 kΩ, and in the unit 2, VR41 is set to 20 kΩ so that the lighting output WL is constantly adjusted to 60 W. In this way, by adjusting the output WL at the time of lighting so as to be constant at VR41, as shown in FIG. 13 (b), the secondary winding 6-2 at both ends of the inductor 6 when the discharge lamp is removed is removed. The load secondary voltage can be made equal between the units 1 and 2. That is, as shown in FIG. 14, when the lighting output WL is plotted on the horizontal axis and the no-load secondary voltage is plotted on the vertical axis, there is a proportional relationship between the lighting output WL and the no-load secondary voltage. By setting the lighting output WL with the volume VR41, the no-load secondary voltage is also set, and the set no-load secondary voltage is described for each unit based on the Electrical Appliance and Material Control Law (display) )There is a need to.

At the end of the life, when an abnormality is detected by the VL and IL detection circuits 9 and 10, the Zener diode ZD is detected.
1 becomes conductive, PUT becomes conductive, and photocoupler PUT1
When the light emitting diode of the above continues to emit light, the phototransistor of the photocoupler PUT1 of the H side control circuit 5H is turned on, the transistors Q31 and Q32 are turned off, and the control operation of the H side control circuit 5H is stopped. In addition, the L-side control circuit 5
When the phototransistor of the photocoupler PUT1 is turned on, L changes so that the series resistance value of the volume VR41 is level-shifted and the on resistance of the transistor Q42 as a variable resistance becomes small, and the on resistance of the transistor Q41 also becomes small. As described above, the level is shifted, the ON period of the switching device 4 is shortened, and the inverter output is controlled to be a constant value which is reduced by one step. The lamp voltage VL at this time becomes the constant value V4 shown in FIG. 11 (b). When the discharge lamp 7 is pulled out from this state, the filament mounting detection means 13 detects the absence of the lamp, illuminates the light emitting diode of the photocoupler PC2, and turns on the phototransistor of the photocoupler PC2 in the latch holding means 11A. , The current increases in the phototransistor, and the holding current flowing in the PUT decreases and is released from the latch, but the light emitting diode of the photocoupler PC1 continues to illuminate, so that the H side control circuit 5H and the L side control circuit 5L The control status is the same as with the lamp at the end of life,
The inverter output voltage, that is, the lamp voltage VL has a constant value V4 as shown in FIG. 11 (c). When the normal discharge lamp 7 is mounted, the filament mounting detection means 13 detects the presence of the lamp and stops the light emission of the photocoupler PC2, so that the photocoupler PC in the latch holding means 11A is stopped.
Both the phototransistor 2 and the light emitting diode of the photocoupler PC1 are turned off. As a result, the H-side control circuit 5H and the L-side control circuit 5L are released from the output reduction operation, the switching device 4 is turned on again by the starting circuit 16 and the inverter output is increased at the time of starting, and the discharge lamp 7 is discharged. Lights up. After the normal lighting, the lamp voltage VL becomes substantially constant at V3 as shown in FIG. 11 (e).

The operation at the end of life of the power supply device shown in FIG. 12 is shown in the flowchart of FIG. In step S1, it is determined whether or not there is a lamp, and if there is a lamp, the control operation of the H-side control circuit by the latch in step S2 is stopped. After that, when the lamp is pulled out, the process proceeds to step S3, where a signal indicating the removal of the lamp is generated and a latch release signal is generated. In step 4, the control operation of the H-side control circuit is continuously stopped on the basis of the signal indicating the lamp disengagement. This state is maintained as long as there is no lamp. Next, the presence / absence of a lamp is determined (step S
If it is determined that the lamp is mounted in step 5), step S
Proceeding to step 6, the starting voltage is generated and the lamp is turned on.

In the power supply device of FIGS. 10 and 12, when the discharge lamp 7 is pulled out while the discharge lamp 7 is normally lit, the filament attachment detecting means 13 detects this and detects the latch holding means. Since the phototransistor of the photocoupler PC2 in 11A is turned on and the light emitting diode of the photocoupler PC1 connected in series to this is also turned on, the H-side control circuit 5H stops the H-side control operation, and at the same time, the L-side control circuit 5L. Performs constant output control operation. As a result, even when the discharge lamp 7 is removed in the normal lighting state, it is possible to set the lamp voltage to a reduced constant value similar to the case where the lamp abnormality is detected.

FIG. 16 shows a power supply unit according to the sixth embodiment of the present invention. This embodiment is an improvement of the embodiment of FIG. 12 for two lights. In FIG.
Two discharge lamps 7A and 7B are connected in series, and the discharge lamp 7A
The filament 7-2 and the discharge lamp 7B 7-3 obtain the output voltage from the secondary winding 6-2 of the inductor 6 by transformer coupling. As for the filament mounting detecting means, in addition to the filament mounting detecting means 13 for the discharge lamp 7A, a filament mounting detecting means 17 for the discharge lamp 7B is provided. The configuration of the filament attachment detecting means 17 is the same as that of the filament attachment detecting means 13, and a series circuit of a resistor 51 and a diode D51 is connected in parallel between the filament terminals,
Further, a series circuit of a resistor 52 and a capacitor C51 is connected in parallel, and a resistor R53 and a light emitting diode of a photocoupler PC3 are connected in parallel to both ends of the capacitor C51.
The collector / emitter of the phototransistor of the photocoupler PC3 is connected in parallel with the collector / emitter of the phototransistor of the photocoupler PC2 that performs the latch release function in the latch holding means 11A. Other configurations are the same as those in FIG.

In the embodiment shown in FIG. 16, the discharge lamps 7A and 7A
When either one of B is removed, the photocoupler PC2,
One of the light emitting diodes of PC3 is turned on, and the phototransistor which is the light receiving portion thereof is also turned on, so that the light emitting diode of the photocoupler PC1 is turned on. Therefore, when one of the discharge lamps is missing, the H side control circuit 5
The control operation of H is off, and the L-side control circuit 5L carries out constant value control of output reduction. Only when both the discharge lamps 7A and 7B are mounted, the light emission of the photocouplers PC2 and PC3 is turned off, the light emission of the photocoupler PC1 is also turned off, and the control operation stop of the H side control circuit 5H is released and the L side control is performed. Since the output reduction operation of the circuit 5L is also canceled, a starting voltage is generated and both the discharge lamps 7A and 7B are started and the lighting is started.

FIG. 17 shows a power supply unit according to the seventh embodiment of the present invention. Although the present embodiment is similar to the configuration of FIG. 12, it differs from FIG. 12 in the configuration of the H-side control circuit 5H and the configuration of the L-side control circuit 5L.

The H-side control circuit 5H includes the latch holding means 11
The photocoupler PC1 of A has a phototransistor which is a light receiving portion for the light emitting portion, and a series circuit of resistors R31 and R32 and a zener diode ZD31 is connected in parallel across the output capacitor C6 of the control power supply 14 to connect the resistors R31 and R32. The collector and emitter of the phototransistor are connected in parallel at both ends of the series circuit, the connection point of the resistors R31 and R32 is connected to the base of the PNP transistor Q31, the emitter of Q31 is connected to the positive output terminal of the capacitor C6, and Q31 Is connected to the base of an NPN transistor Q32 via a resistor R33, and the collector of Q32 is connected to the negative output terminal of a capacitor C6. The emitter of Q32 is connected to the gate circuit of the switching device 4 through the parallel circuit of the resistor R34 and the capacitor C31 and further through the diode D31.

The L-side control circuit 5L has a series circuit of a resistor R42, a collector / emitter of a PNP transistor Q42, and a resistor R43 connected in parallel across the output capacitor C6 of the control power supply 14, and the base of Q42 is a resistor volume VR41. Connected to the sliding terminal of, and one end of the resistance volume VR41 is connected to the negative output terminal of the capacitor C6 via the resistance R44, and V
The other end of R41 is connected to the positive output terminal of the rectifier 2 via the resistor R20, the capacitor C42 is connected in parallel to both ends of the series circuit of VR41 and the resistor R44, and the collector of Q42 is connected to the base of the NPN transistor Q41. One is connected to the negative output terminal of the capacitor C6 via the resistor R43, the emitter of Q41 is connected to the negative output terminal of the capacitor C6, and the collector of Q41 is connected to the negative output terminal of the capacitor C6 via the capacitor C41. It is connected to the gate circuit of the switching device 4 via the diode D41. Other configurations are the same as those in FIG.

In the structure shown in FIG. 17, during normal operation, when the output voltage Vcc of the control power supply 14 rises,
Since the resistance-divided potential is applied to the base of the transistor Q31, the transistor Q31 turns on and the transistor Q32 also turns on. If the transistor Q32 turns on, the resistance R
An impedance determined by 34 and the capacitor C31 is equivalently added to the gate circuit of the switching device 3 to normally control the inverter output. On the other hand, at the end of life, VL
, IL detection circuits 9 and 10 detect an abnormality, the Zener diode ZD1 becomes conductive, the PUT turns on, the light emitting diode of the photocoupler PC1 illuminates, and based on this, the phototransistor of the photocoupler PC1 in the H side control circuit 5H turns on. When turned on, the transistor Q31 is turned off,
Since Q32 is turned off, the control operation of the H side control circuit 5H is stopped. At the same time, the phototransistor of the photocoupler PC1 is turned on, so that the voltage Vcc of the power supply output line of the control power supply 14 is controlled to a voltage lower by one step determined by the Zener voltage of the Zener diode ZD31, and the L side control is performed by the lowered voltage Vcc. Since the circuit 5L performs the control operation, it is possible to control the output of the inverter to the constant value of the level lowered by one step. In other words, the inverter output when the H-side control is stopped, that is, the lamp voltage VL, can be set to a constant value which is lowered by one step by controlling the voltage Vcc.

FIG. 18 shows a power supply unit according to the eighth embodiment of the present invention. 17 and the present embodiment,
The configuration of the H-side control circuit 5H is different. The L-side control circuit 5L is the same as in FIG. In the present embodiment, the H-side control circuit 5H is arranged near the gate circuit of the switching device 3 of the inverter 12.

Photocoupler PC of the latch holding means 11A
A phototransistor which is a light receiving part for the light emitting part of 1 is provided, and a series circuit of a Zener diode ZD31 and a capacitor C32 is connected in parallel to both ends of the output capacitor C6 of the control power supply 14, and the collector of the phototransistor is connected in parallel to the capacitor C32. Connect the emitter and connect the connection point of Zener diode ZD31 and capacitor C32 to diode D31.
Is connected to the control circuit 5H on the H side. The H-side control circuit 5H is connected in parallel with the secondary winding 8-2 of the drive transformer 8 in the gate circuit of the switching device 3 of the inverter 12 in parallel with the diode D32 and the collector of the transistor Q33.
A series circuit of an emitter and a resistor R36 is connected, a capacitor C34 is connected in parallel between the collector of the transistor Q33 and the source of the switching device 3, and a resistor R35 and a capacitor C33 are connected in parallel between the base of the transistor Q33 and the source of the switching device 3. Are connected in parallel circuit. Other configurations are the same as those in FIG. Diode D32 and capacitor C
The circuit composed of 34 is for rectifying and smoothing the high frequency current appearing in the gate circuit of the switching device 3 to store a DC voltage in the capacitor C34 and using it as the collector power source of the transistor Q33.

In the configuration shown in FIG. 18, during normal operation, when the output voltage Vcc of the control power supply 14 rises,
It enters the base of the transistor Q33 through the Zener diode ZD31, the resistor and the diode D31. Transistor Q
When 33 is turned on, the impedance determined by the resistor R36 is added to the gate circuit of the switching device 3 to normally control the inverter output. On the other hand, at the end of life, VL,
When the IL detection circuits 9 and 10 detect an abnormality, the Zener diode ZD1 is turned on, the PUT is turned on, the light emitting diode of the photocoupler PC1 is illuminated, and the phototransistor of the photocoupler PC1 is turned on based on this, thereby controlling the H side. Since the base potential of the transistor Q33 in the circuit 5H drops to the reference potential and Q33 is turned off, the control operation of the H side control circuit 5H is stopped. At the same time, the phototransistor of the photocoupler PC1 is turned on, so that the voltage Vcc of the power supply output line of the control power supply 14 is controlled to a voltage lower by one step determined by the Zener voltage of the Zener diode ZD31, and the L side control is performed by the lowered voltage Vcc. Circuit 5L
Perform a control operation, it is possible to control the output of the inverter to a constant value with a level lowered by one step. That is, H
It is possible to set the inverter output when the side control is stopped, that is, the lamp voltage VL, to a constant value which is lowered by one step by controlling the voltage Vcc.

FIG. 19 is a perspective view showing an illumination device according to an embodiment of the present invention.

In the figure, reference numeral 201 is the main body of the illuminating device,
The discharge lamp 7 is mounted on the main body 201. Further, in the main body 201, for example, a discharge lamp lighting device 200 as shown in any one of the embodiments of FIGS. 1 to 18 and FIGS. The discharge lamp lighting device 200 may be provided outside the main body 201 instead of being provided inside the main body 201. Further, although the lighting device of the present embodiment is of a type directly attached to the ceiling, other devices may be used.

FIG. 20 is a circuit diagram showing a power supply device according to a ninth embodiment of the present invention, and FIG. 21 is a waveform diagram of each part of FIG. FIG. 20 shows a two-stone two-lamp discharge lamp lighting device.

In the embodiment shown in FIG. 20, the primary winding of the drive transformer CT is in the closed loop even when the lamp is unplugged (hereinafter, the lamp is unplugged). It is for prevention. That is, it is intended to prevent the inverter from consuming electric power even though there is no discharge lamp as a load.

In FIG. 20, when the lamp disconnection detection circuit A detects the lamp disconnection, the diode of the photocoupler PC2 emits light and the phototransistor of PC2 is turned on. At this time, the potential of the capacitor C1 changes to the Zener diode Z.
It is charged to the potential determined by D1 and transistor Q5
Is turned on (hereinafter ON). This turns on Q1,
The inverter stops. PC2 by stopping the inverter
Since the light emitting diode of is turned off (hereinafter OFF), C
1 is discharged, Q5 is turned off, and oscillation starts. After that, the lamp is reattached and the operation is repeated until the PC2 diode does not emit light during the operation of the inverter.

When the lamp life detecting circuit B detects the lamp life and the PC1 diode emits light, the phototransistor of PC1 is turned on, the PUT is turned on, and the latch is held.
At this time, C1 is charged to the ZD1 potential and Q5 is turned on.
And stop the oscillation. By the way, when the oscillation is stopped, the trigger voltage VC3 of the capacitor C3 changes from 0 to VTH (threshold value of the trigger element TR). Therefore, if Q6 is turned on near VTH, Q6 is turned on and Q5 is turned off. To do. Therefore, Q1 and Q2 oscillate intermittently. On the other hand, PUT is Q
Since the holding current can be supplied even when 6 is ON and Q1 and Q2 are oscillating, the latch is maintained. In the above operation, when the lamp is removed to replace the lamp, the phototransistor of PC2 is turned on, so that the holding current of the PUT is cut off and the latch is released. After that, the operation of the lamp disconnection circuit starts.

Although it is possible to turn off the transistor Q2 instead of turning off the transistor Q1, there is a reason to turn off Q1 in a complicated structure.

FIG. 22 is a circuit diagram showing a modification of FIG. It shows the configuration when Q2 is turned off. 23 (a) to 23 (e) show the circuit operation of FIG.

In FIG. 22, since Q2 is turned off, a simple structure can be obtained. However, if Q2 is forcibly turned off,
Or, if the drive of Q2 decreases, the capacitor C6,
Although C6 is charged by the resonance of the primary winding IVTP of the inverter transformer IVT, it is not discharged and the voltage after rectification rises, and the voltage applied when Q2 is OFF (the collector-emitter voltage of Q2). VCEQ2) becomes excessive. As a result, Q2 requires a high breakdown voltage element. When turning off Q2, diode D
1 can reduce the inverter output at the same time.

In FIG. 23, since Q2 does not turn on,
Alternatively, since the number of ONs is small, the currents of the circled numbers 1 and 5 shown in FIGS. 23 (a) and (e) are small, so that the C6 voltage becomes excessive and the positive terminal potential VDC of the rectifier (that is, the capacitor C5 positive side potential) is growing. As a result, Q1 is ON, Q2 is OF
At F, the voltage applied to Q2 becomes excessive.

According to the embodiment shown in FIG. 20, the lamp removal,
At the end of the lamp's life, the electronic parts generate less heat, enabling longer life. Also, the power consumption is low when the lamp is removed and the lamp is at the end of its life.

FIG. 24 is a circuit diagram showing a power supply device according to the tenth embodiment of the present invention. FIG. 24 shows a two-lamp single-stone discharge lamp lighting device.

This is a configuration for intermittent oscillation at the time of lamp removal and the end of the lamp life (hereinafter referred to as the end of the lamp life). Conventionally, when the lamp oscillates and the lamp oscillates intermittently at the end of the lamp life, the starting voltage is generated at the time of re-oscillation, so the lamp blinks.

In FIG. 24, the diode D1 lowers the gate potential of the inverter output control section Q3 to the level of the ground GND, so that the intermittent output during intermittent oscillation can be suppressed to a low level. , It is possible to completely eliminate the blinking of the lamp during intermittent oscillation. The detection sensitivities of the circuits A, B, and C are adjusted so that the output voltage at the time of intermittent oscillation becomes a level at which the lamp is not restarted.

According to the embodiment of FIG. 24, the lamp removal,
At the end of the lamp life, the output was suppressed below the lamp start, so the lamp did not blink. Therefore, the stress of the lamp can be reduced.

The embodiments of FIGS. 20 and 24 described above have a function of varying the output of the inverter, and
Alternatively, it is provided with a safety circuit configuration (that is, photocouplers PC1 and PC2) that detects the end of the lamp life and causes the inverter to operate intermittently, but has the following features.

(1) At the time of the intermittent oscillation, the output variable circuit section is set to the output lower limit state simultaneously with the intermittent oscillation.

(2) The intermittent oscillation performed at the end of the lamp life is performed by using the latch element, and after the latch trigger (end of life detection signal) is input, the latch operation of the latch element is maintained except for the lamp removal. It is characterized by

(3) The latch operation of (2) is characterized in that the oscillation of the inverter is intermittently restored by the trajectory trigger signal of the inverter. The latch element maintains the latch operation even when the oscillation is restored.

(4) The latch operation of (2) is characterized in that the latch is released by the lamp disconnection signal, and then the intermittent operation is performed by the lamp disconnection signal.

(5) The output generation period at the time of intermittent oscillation is characterized in that the output voltage is set so that the output voltage becomes equal to or lower than the lamp starting voltage.

(6) The intermittent oscillation operation is performed by short-circuiting / opening the drive signal of the main switching element of the inverter by the auxiliary switch element. In the case of an inverter configuration of two or more stones, the inverter start trigger signal is not input. It is characterized in that it is provided in the main switching element on the side.

The following embodiments shown in FIG. 25 to FIG. 28 relate to a circuit configuration for detecting a lamp abnormality, and it is judged that the lamp is abnormal when the lamp voltage rises. After that, it is configured to rise with a time constant (delay) of several seconds to several tens of seconds. This is to prevent the starting secondary voltage generated on the secondary side of the inverter from being detected as an abnormality when the power is turned on. Conventionally, if the abnormality detection voltage does not decrease after the lapse of the above time, it is determined that the lamp is abnormal and the inverter output is controlled to decrease through the safety circuit (photocoupler), so that the generation of the starting secondary voltage is suppressed. Conventionally, in order to simplify the control circuit, the adjustment level of the inverter output adjustment circuit is set to be the same level when lighting and when the starting secondary voltage is generated. However, since the control level is the same when the lamp is lit and when the starting secondary voltage is generated, if the level setting that emphasizes the level when the lamp is lit is performed, the generated value of the starting secondary voltage becomes extremely large or small. There was something that happened. If the starting secondary voltage is small, it causes a defective starting of the lamp, and if it is large, the leakage current generated from the lamp becomes excessive and adversely affects the device parts.

Therefore, in the embodiment shown in FIGS. 25 to 28, when the rise of the lamp voltage is detected using the time constant circuit, when the time constant circuit is operating (the voltage to be detected rises The control level of the inverter control circuit is changed (switched) to match the starting secondary voltage.

FIG. 25 is a circuit diagram showing a power supply device according to an eleventh embodiment of the present invention, and FIG. 26 is a diagram for explaining the operation of FIG. In FIG. 26, V detection means the detection voltage of the abnormality detection circuit.

In FIG. 25, the time constant circuit is constructed by combining the capacitor C1 and the transistor Q1, and a long time constant can be generated even with a small capacitor. In the present embodiment, the light emitting diode of the photocoupler PC2 is connected in series with the collector terminal of the transistor Q1 of the time constant circuit so that PC2 emits light, that is, the capacitor C1.
While the charging current is flowing and the transistor Q1 is turned on, the control level of the inverter control circuit is changed to an appropriate starting secondary voltage by turning on the phototransistor on the secondary side of PC2. Since the lamp voltage is kept low and constant after the lamp is lit, the time constant circuit does not perform the charging operation. That is, PC2 is turned off, and the lighting of the lamp is controlled by the control level at lighting different from the starting secondary voltage.

By the way, in the case of the embodiment of FIG. 25, in the case of an inverter using a plurality of lamps having different lamp voltages as compatible loads, the detected voltage is not always at the steady level at the time of starting. If the detected voltage after lighting is lower than the steady level during stable lighting, the time constant circuit will charge even after lighting, so the brightness immediately after lighting will be brighter or darker than during steady lighting. Conceivable.

FIG. 27 shows a twelfth embodiment of the power supply device according to the present invention, in which this problem has been improved. FIG.
27 shows an operation explanatory diagram of FIG.

27 is different from FIG. 25 in that the Zener diode ZD2 is provided in series with the light emitting diode of the photocoupler PC2, and (detection voltage during steady lighting) ≦
(ZD2 Zener voltage). The detected voltage instantly rises to the ZD2 Zener voltage with a short time constant, and after the lamp starts, the detected voltage becomes higher than the steady-state level,
Since the charging current to the capacitor C1 does not flow, make sure that the PC
2 can be turned off, and there will be no change in brightness immediately after lighting.

According to the embodiment of FIGS. 25 and 27,
With a simple configuration, the inverter control level can be set optimally during lighting and when the secondary voltage for starting is generated. In addition, it is possible to prevent a change in brightness immediately after lighting, although the control levels are different in the two modes of lighting and starting.

The embodiments of FIGS. 25 and 27 described above detect the lamp voltage that rises with a time constant after the occurrence of a lamp abnormality, and perform detection as an abnormality when the detected voltage exceeds a predetermined value. However, it has the following features.

(1) When the time constant circuit operates (when the detection voltage rises), the control level of the inverter control circuit is switched to a level suitable for the starting secondary voltage different from the lighting state.

(2) It is characterized in that the detection voltage of the circuit for detecting the lamp abnormality is raised (instantaneously) to the level at the time of normal lighting before lighting the lamp without delay (instantaneously).

The embodiments described with reference to FIGS. 29 to 38 below relate to a circuit for detecting a lamp abnormality. However, conventionally, even a lamp abnormality can be judged to be abnormal depending on the ambient temperature of the lamp. The detection voltage may not rise or may be released again even if it rises. In this case, the safety circuit of the inverter does not operate (that is, abnormal transmission due to lighting of the photocoupler is not performed), and excessive stress is applied to the inverter. In addition to increasing the stress on the lamp, semiconductor damage to the inverter,
In some cases, the end of the lamp tube was destroyed.

FIG. 29 illustrates a problem when the filament is broken. During use, after the metal component of the lamp filament is deposited on the base of the electrode (called flare),
If the filament is broken, a high-frequency current will flow over the deposited film, causing the deposited film to generate power loss (heat loss) and generate heat, causing the glass flare to melt at high temperatures, causing the lamp to fall off and catch fire. May occur.

A constant current determined by the output voltage of the inverter and the capacitor C is supplied as the filament current If. Since the vapor deposition film resistance R (deposition film) is several Ω to several MΩ, for example, the inverter output is 300 V and C is 5600 p
F, inverter output frequency f = 50kHz, R (deposited film)
Is 100Ω, W (deposited film) = 2π × 50 kHz × 5600 pF × 300
A loss of V × 100Ω = 53 W occurs, the vapor deposition film generates heat, and the glass melts.

FIG. 30 is a circuit diagram showing a power supply device according to a thirteenth embodiment of the present invention, and FIG. 31 is a diagram for explaining the operation of FIG.

In FIG. 30, in order to detect a lamp abnormality,
The lamp voltage VL is provided by providing a voltage detector and a direct current detector.
Since it is configured to detect two values, that is, half-wave current detection (DC current detection), the lamp abnormality is reliably detected regardless of changes in ambient temperature, and the safety circuit operation is performed. That is, in the VL detection, if the abnormality detection level is V20 'as shown in FIG. 31 (a), the abnormality cannot be detected in the temperature region shown by the crosshatch pattern, but in the IL detection, the same detection level V20' is obtained. It is possible to detect an abnormality even in the temperature range where VL cannot be detected. Therefore, V
Half-wave current detection can cover the temperature range that cannot be covered by L detection.

FIG. 32 is a circuit diagram showing a power supply device according to a fourteenth embodiment of the present invention, and FIG. 33 is a diagram for explaining the operation of FIG.

In FIG. 32, since a PUT (programmable unijunction transistor) is provided as a holding means for holding the state after the abnormality is detected, the safety circuit operation is held by the holding means after the safety circuit is operated. The inverter and lamp can always be controlled in a safe state regardless of changes in ambient temperature after circuit operation and abnormal lamp discharge. That is, after the safety circuit is operated, it is always turned on regardless of the state of the load. Since the PUT can be turned off (the safety circuit is released) by stopping the oscillation of the inverter, the power can be turned off and the lamp can be removed.

FIG. 34 is a circuit diagram showing a power supply device according to a fifteenth embodiment of the present invention, and FIGS. 35 to 37 are views for explaining the operation of FIG.

In FIG. 34, an impedance element (capacitor, inductor, or resistor) is arranged in parallel with the filament.
Is provided, the electric power applied to the vapor deposition film on the flare can be limited by the parallel impedance.
The filament current I (f
If the impedance) is increased, the current I (deposited film) flowing through the deposited film can be reduced as shown in FIG. 37, and as shown in FIG. 36, W (deposited film) = I (deposited film) ×
R (deposited film) can be suppressed.

FIG. 38 is a diagram for explaining a problem when the lamp is removed from the state of FIG.

If there is a filament parallel impedance, the feedback current continues to flow even after the lamp is pulled out, so self-sustained pulsation continues. Since the safety circuit is latching, the starting voltage cannot be generated again even if the lamp is remounted.

FIG. 39 is a circuit diagram showing a power supply unit according to the 16th embodiment of the present invention.

In FIG. 39, in the case of the parallel impedance arrangement for the filament, considering the self-excited inverter that feeds back the secondary current of the inverter, the filament attachment detection means is arranged to reduce or stop the high frequency output of the inverter when the lamp is disconnected. Provided. Since there is no lamp when the lamp is removed, flare melting need not be considered. When the filament detachment detecting means detects the lamp disconnection, the light emitting diode of the photocoupler PC2 emits light and the phototransistor turns on, thereby releasing the PUT which is the means for holding the safety circuit, but PC2 and PC1 continue to turn on. With the configuration, the operation of reducing the high frequency output of the inverter continues, and the inverter can be protected. That is, when the lamp is removed, PC2 emits light and PUT is reset. At this time, since PC1 continues to be turned on through the phototransistor of PC2, the inverter remains in safe operation. When the lamp is installed normally, since PUT is OFF and PC2 is OFF, a starting voltage can be generated and the lamp is turned on again.

FIG. 40 is a circuit diagram showing a discharge lamp lighting device according to the seventeenth embodiment of the present invention.

In FIG. 40, the AC power supply voltage from the commercial AC power supply 51 is rectified by the rectifier 52, smoothed by the smoothing capacitor C51, and supplied to the inverter 60. The inverter 60 includes a drive circuit 61 and resistors R61 and R
62 and FETs 62 and 6 which are switching devices
The rectification voltage from the rectification device is converted into an AC voltage having a frequency higher than the output frequency of the rectification device by using a switching device. The connection points of the FETs 62 and 63 are the capacitor C61, the coil L61, and the discharge lamp 5.
3 is connected to the source of the FET 63 through the series connection, and the capacitor C62, the coil L62, and the discharge lamp 5 are connected.
4 connected in series to the source of FET 64.

The first power supply circuit includes a capacitor C65,
It is composed of diodes C65 and C66, and creates a DC power supply voltage from the output of the inverter 60 and outputs it to the wiring 66. The wiring 66 is connected to the reference potential point via the smoothing capacitor C50.

The discharge lamps 53 and 54 are connected in parallel with the capacitor C.
63 and C64 are connected.

The connection point on the positive electrode side of the discharge lamp 53 and the capacitor C63 is connected to the end of life detecting circuit period 67 which is an abnormality detecting means.

The end of life detection circuit period 67 includes an NPN transistor 68, a diode D67, a capacitor C67 and a resistor R.
67 and R68, each detects an abnormality (end of life) of the discharge lamp 53, and supplies a detection voltage of the detection result to the end of life signal generation circuit 71.

The end of life detection circuit period 69 is an NPN transistor 70, a diode D69, a capacitor C69, a resistor R.
69 and R70, each detects an abnormality (end of life) of the discharge lamp 54, and supplies a detection voltage of this detection result to the end of life signal generation circuit 73. The end-of-life signal generation circuit 71 includes a comparator 72, a power supply E71 that generates a reference voltage that serves as a reference for comparison of the comparator 72, a resistor R71, and a capacitor C71. When the output exceeds the predetermined level, the output which becomes the high level is supplied to the output reduction holding means 75.

The end-of-life signal generating circuit 73 includes a comparator 74, a power supply E73 which generates a reference voltage which serves as a reference for comparison of the comparator 74, a resistor R73 and a capacitor C.
When the detection result of the end of life detection circuit period 69 exceeds a predetermined level, the output reduction holding means 78 is supplied with an output that becomes a high level.

On the other hand, the first and second notification lamps 81, 8
Reference numeral 2 is a light emitting diode, the anode of which is connected to the wiring 66, and the DC power supply voltage from the first power supply circuit 65 is led to one end. The cathodes of the first and second notification lamps 81 and 82 are
It is supplied to the output reduction holding means 75 and 78, respectively.

The output reduction holding means 75 includes resistors R75 and R75.
76, R77, R78, PNP transistor 76, NP
N-transistor 77, capacitors C75, C76, C7
7 and a diode D75. When the output from the end-of-life signal generating circuit 71 is at a high level in the state where a power supply voltage of a predetermined value or more is supplied from the wiring 66, the signal is latched and the notification lamp 81 A current flows from the cathode, and the notification lamp 81 is turned on.

The output reduction holding means 78 includes resistors R79 and R.
80, R81, R82, PNP transistor 79, NP
N-transistor 80, capacitors C78, C79, C8
0, a diode D78, and when the output from the end-of-life signal generating circuit 73 becomes a high level in the state where the power supply voltage of a predetermined value or more is supplied from the wiring 66, the signal is latched and the notification lamp 82 is turned on. A current flows from the cathode, and the notification lamp 82 is turned on.

The second power supply circuit 90 includes resistors R91 and R9.
2 is provided on the side closer to the AC power supply than the inverter 60 (between the output terminals of the AC power supply 51 in the case of the embodiment of the present invention), and the power supply voltage is supplied from the output of the preceding stage supplied to the inverter. It is created and guided to the wiring 66 (that is, one end of the plurality of notification lamps 81 and 82).

When the power supply voltage is supplied from the wiring 66, the oscillation control IC 91 supplies a control signal to the drive circuit 61 to oscillate the FETs 62 and 63 and operate the inverter 60.

The oscillation control IC 91 and the drive circuit 61 are control circuits which operate by the DC power supply voltage from the first power supply circuit 65 and control the output of the inverter 60.

With such a configuration, the output reduction holding means 75 and 78 turn on the plurality of notification lamps 81 and 82, respectively, when the plurality of abnormality detecting means detect an abnormality. The power supplied from the first power supply circuit to the control circuit is reduced to reduce or stop the output of the inverter.

The operation of the embodiment of the invention as described above will be described with reference to the case where the discharge lamp 53 reaches the end of its life.

When the discharge lamp 53 reaches the end of its life, the discharge lamp 5
3 and the voltage at the connection point on the positive electrode side of the capacitor C63 increase, the detection voltage of the end of life detecting circuit period 67 increases, and the end of life signal generating circuit 71 causes the output reduction holding means 75 to output a high level output. Supply. As a result, the PNP transistor 76 is turned on, the NPN transistor 77 is turned on, and the notification lamp 81 is turned on to emit light. When the notification lamp 81 is turned on, the oscillation control IC 91 is connected from the wiring 66.
Voltage decreases, the oscillation control IC 91 is turned off, the drive circuit 61 is turned off, and the FET 6 is turned off.
2, 63 are stopped oscillating, and the output of the inverter 60 is stopped. Here, the output of the inverter 60 is stopped, and the first
Although the output of the power supply circuit 65 is also turned off, power is supplied from the second power supply circuit 90 and the diode 81 keeps emitting light.

When the discharge lamp 54 reaches the end of its life, the output of the inverter 60 is stopped and the notification lamp 82 emits light.

In FIG. 40, when the oscillation control IC 91 is turned off, the drive circuit 61 is turned off and the output of the inverter 60 is stopped.
The output of the inverter 60 may be reduced without turning off when C91 is turned off.

According to the embodiment of the invention as described above, since the inverter output can be reduced and maintained when the discharge lamp is abnormal, the output can be reduced and the safety can be improved when the discharge lamp is abnormal. Even when is completely stopped, the second power supply circuit 90 can maintain the lighting of the notification lamp, which is very convenient.

FIG. 41 is a circuit diagram showing a discharge lamp lighting device according to the eighteenth embodiment of the present invention. The same components as those of the embodiment of the invention shown in FIG. Is omitted.

Referring to FIG. 41, in the embodiment of the present invention, the output reduction holding means 75,
A system-off circuit 101 for releasing the latch of the plurality of notification lamps 81 and 82 in the on-state is provided for 78.

The system off circuit 101 includes a remote control off / power source monitoring means 102, an NPN transistor 103,
105, a PNP transistor 104, a resistor R101,
It is composed of R102 and a capacitor C101.

The remote control off / power supply monitoring means 102, when the notification lamp is turned off by the remote control or when a high level signal is output by the power supply, the NPN transistor 103,
105, the PNP transistor 104 is turned on, the current of the wiring 66 flows directly from the NPN transistors 103 and 105 to the reference stage point, and when the voltage of the wiring 66 becomes the same level as the voltage of the reference potential point, the output reduction holding means 75, 78.
The charge is discharged from the capacitors C76 and C79 of
The N transistors 77 and 80 are turned off, and the latches of the PNP transistors 76 and 79 are released.

According to the embodiment of the invention as described above, since the inverter output can be reduced and maintained when the discharge lamp is abnormal, the output can be reduced and the safety can be improved in the case of the discharge lamp abnormality, and at the same time, it is simple. With such a circuit configuration, it is very convenient because you can unlatch the notification lamp by turning off the power or operating the remote control.

FIG. 42 is a circuit diagram showing a discharge lamp lighting device according to the eighteenth embodiment of the present invention. The same components as those of the embodiment of the invention shown in FIG. 41 are designated by the same reference numerals. Is omitted.

In FIG. 42, the system-off circuit 201 is shown.
Is an NPN transistor 202, 203, a resistor R201
The system is turned off by a predetermined operation of the remote control off means 202, the power supply monitoring means 203, etc., and the power supplied from the power supply circuit 65 to the oscillation control IC 91 is reduced to reduce the output of the inverter. At the same time as stopping, the output reduction holding means 75, 78 are made to release the latch of the plurality of notification lamps 81, 82 in the ON state. Remote control off means 20
2 and the power supply monitoring means 203 connect the wiring 220 to the reference potential point to cause the system-off circuit 201 to perform the system-off operation.

The mounting detection control circuit 211 includes the first and second
Is connected to the output reduction holding means 75 and 78 through the anode / cathode paths of the diodes D221 and D222, and the control terminal is connected to the remote control off means 20.
2 and the output terminals of the power supply monitoring means 203 and the like. The mounting detection control circuit 211 includes the NPN transistor 2
12, resistors R211 to R217, and diode D21
1, D212, a Zener diode Dz211, and capacitors C211 and C212, and has mounting detection means for detecting the mounting of the plurality of discharge lamps 53 and 54. The mounting detection means does not mount a discharge lamp. When it is detected that none of the plurality of abnormality detecting means (lifetime detection circuit period 67, 69) has detected an abnormality, the system-off circuit 201 is caused to perform a system-off operation, and When at least one of the plurality of abnormality detecting means detects an abnormality, the system off operation by the system off circuit is stopped.

The operation of this embodiment of the invention will be described.

When the discharge lamps 53 and 54 are mounted together, and the discharge lamp 53 is removed while both discharge lamps 53 and 54 are not at the end of their life, in this case, the voltage of the emitters of the PNP transistors 76 and 78 is High, diode D
Both 221 and D222 are turned off. On the other hand, the discharge lamp 5
Since the connection points of the negative electrodes 3 and 54 and the capacitors C63 and C64 are both in a high state, the mounting detection control circuit 211
At, the diodes D211 and D212 are turned off, the Zener diode Dz211 is turned on, and the NPN transistor 212 is turned on. This turns off the NPN transistor 203 in the system-off circuit 201,
The NPN transistor 202 turns on. This causes the system-off circuit 201 to perform a system-off operation to reduce the power supplied from the power supply circuit 65 to the oscillation control IC 91 to reduce or stop the output of the inverter, and to the output reduction holding means 75, 78. The latches for turning on the plurality of notification lamps 81 and 82 are released.

With the discharge lamps 53 and 54 both attached, and both discharge lamps 53 at the end of their lives, the discharge lamp 53
In this case, the PNP transistor 76
The voltage of the emitter of is low, and the diodes D221 are both turned on. As a result, the Zener diode Dz211
Turns off and the NPN transistor 212 turns off. As a result, in the system-off circuit 201, the NPN transistor 203 turns on and the NPN transistor 202 turns off. As a result, the system-off operation of the system-off circuit 201 becomes impossible, the power supplied from the power supply circuit 65 to the oscillation control IC 91 does not decrease, the output of the inverter 60 does not decrease, and the output reduction holding means 7
For 5, 78, the notification lamp 81 is kept latched in the ON state. As a result, the notification lamp 81 continues to emit light.

When the discharge lamp 54 is removed, the operation is the same as when the discharge lamp 53 is removed.

According to the embodiment of the invention as described above, since the inverter output can be reduced and maintained when the discharge lamp is abnormal, the output can be reduced and the safety can be improved when the discharge lamp is abnormal. With such a circuit configuration, it is possible to prevent the notification lamp from being accidentally turned off when the discharge lamp is replaced at the end of its life, which is very convenient.

The discharge lamp shown in FIG. 40 to FIG.
Although two cases have been described above, a plurality of other discharge lamps (for example, five discharge lamps) may be provided.

[0207]

According to the invention described in claim 1, when the load is attached and the load is abnormal, the output is reduced to the lower limit of the output of the inverter, and when the load is removed from this state, It is possible to release the above-mentioned output reduction hold and control the inverter output to a set constant value. As a result, when the load is removed from the device after detecting a load abnormality, the no-load secondary voltage of the inverter can be suppressed to a fixed value within ± 10% (public standard) with respect to variations in circuit components. it can. In the case of a load abnormality and the accompanying load removal, it is possible to reduce the output and enhance the safety, and it is possible to satisfy the official standard.

According to the second aspect of the present invention, the inverter output can be controlled to the set constant value when the load is attached and the load is abnormal or when the load is not attached. As a result, the inverter output can be suppressed to within ± 10% (public standard) with respect to variations in circuit components both when the load is abnormal and when the load is not attached.

According to the third aspect of the present invention, the first control circuit is related to the resonance system and has the characteristic that the frequency changes and the inverter output greatly changes in response to changes in the control level. The control circuit relates to the smoothing voltage by the first capacitor and has a characteristic that the smoothing voltage changes in response to a change in the control level and the inverter output changes smoothly. When the load is abnormal, the control operation by the first control circuit is stopped to set (reduce) the output to the lower limit, and then the stable output control is performed by the second control circuit. When a load abnormality occurs, the output can be reduced to improve safety.

According to the fourth aspect of the present invention, when the load abnormality is detected, it can be latched. Therefore, once the load abnormality is generated, the load abnormality detection signal is continuously output. Therefore, the first control While the control operation by the circuit is stopped and the output is continuously reduced to the lower limit, stable output setting by the second control circuit can be performed. When a load abnormality occurs, the output can be reduced to improve safety.

According to the fifth aspect of the present invention, a load abnormality can be detected and latched, and when the load is removed in this state, this is detected, the latch is released, and at the same time the load is not mounted. Based on the detection signal, it is possible to maintain the setting that the control operation by the first control circuit is stopped and the output is reduced (squeezed) to the lower limit, and stable output control is performed by the second control circuit. When a load abnormality occurs, the output can be reduced to improve safety.

According to the sixth aspect of the invention, since the second control circuit is provided with a means for adjusting the inverter output, for example, a resistance volume, the inverter output can be controlled to a desired constant value when there is no load. .

According to the seventh aspect of the present invention, the load abnormality detection signal is used to switch the resistance value and the like in the second control circuit to output the second control circuit.
The control level of the second switching device can be shifted by one stage to control the inverter output by one stage. This makes it possible to set the inverter output at the time of load abnormality detection to a lower value. When a load abnormality occurs, the output can be surely reduced to improve safety.

According to the invention as set forth in claim 8, since the inverter output can be reduced and maintained when the discharge lamp is abnormal, when the discharge lamp is abnormal, the output can be reduced to improve the safety and the inverter can be completely operated. It is very convenient because the indicator lamp can be kept lit even when it stops.

According to the ninth aspect of the present invention, since the inverter output can be reduced and maintained when the discharge lamp is abnormal, the output can be reduced and safety can be improved and a simple circuit configuration can be provided when the discharge lamp is abnormal. Then, it is very convenient because you can unlatch the notification lamp by turning off the power or operating the remote control.

According to the tenth aspect of the invention, since the inverter output can be reduced and maintained when the discharge lamp is abnormal, the output can be reduced to improve safety and a simple circuit configuration can be provided when the discharge lamp is abnormal. Therefore, when the discharge lamp is replaced at the end of its life, it is possible to prevent the notification lamp from being accidentally turned off, which is very convenient.

According to the discharge lamp lighting device described in claim 11, since the discharge lamp is used as the load of the power supply device according to any one of claims 1 to 7, when the discharge lamp is abnormal, the discharge lamp output is reduced as much as possible. Therefore, the safety of the discharge lamp lighting device can be improved, and the no-load output can be reduced to a constant value when the discharge lamp is removed. When no load is applied, the inverter output can be suppressed within ± 10% (public standard) with respect to variations in circuit components.

According to the discharge lamp lighting device of the twelfth aspect, since the impedance element is provided in parallel between the filament terminals of the discharge lamp, an excessive output voltage is not generated when the lamp is removed. Further, it is possible to avoid the risk of lamp destruction due to heat generation when the filament is broken.

According to the lighting device of the thirteenth aspect, since the discharge lamp lighting device according to any one of the eighth to twelfth aspects is provided in the lighting device main body, the discharge lamp output is maximized when the discharge lamp is abnormal. Therefore, it is possible to realize a lighting device that can be reduced in safety, enhance the safety of the lighting device, and can reduce the no-load output to a constant value when the discharge lamp is removed. When no load is applied, the inverter output can be suppressed within ± 10% (public standard) with respect to variations in circuit components.

[Brief description of drawings]

FIG. 1 is a block diagram schematically showing a power supply device according to a first embodiment of the present invention.

FIG. 2 is a waveform diagram illustrating a change in lamp voltage at the end of the life of FIG.

FIG. 3 is a circuit diagram showing a specific circuit of the power supply device of FIG.

FIG. 4 is a circuit diagram showing a power supply device according to a second embodiment of the present invention.

5 is a circuit diagram showing a specific circuit of the power supply device of FIG.

FIG. 6 is a block diagram schematically showing a power supply device according to a third embodiment of the present invention.

7 is a circuit diagram showing a specific circuit of the power supply device shown in FIG.

FIG. 8 is a block diagram schematically showing a power supply device according to a fourth embodiment of the present invention.

9 is a circuit diagram showing a specific circuit of the power supply device of FIG.

FIG. 10 is a block diagram schematically showing a power supply device according to a fifth embodiment of the present invention.

11 is a waveform diagram illustrating changes in the lamp voltage at the end of the life of FIG.

12 is a circuit diagram showing a specific circuit of the power supply device of FIG.

FIG. 13 is a diagram illustrating volume setting of the L-side control circuit of FIG.

FIG. 14 is a diagram illustrating volume setting of the L-side control circuit of FIG.

FIG. 15 is a flowchart illustrating an operation at the end of life in FIG.

FIG. 16 is a circuit diagram showing a power supply device according to a sixth embodiment of the present invention.

FIG. 17 is a circuit diagram showing a power supply device according to a seventh embodiment of the present invention.

FIG. 18 is a circuit diagram showing a power supply device according to an eighth embodiment of the present invention.

FIG. 19 is a perspective view showing a lighting device according to an embodiment of the present invention.

FIG. 20 is a circuit diagram showing a power supply device according to a ninth embodiment of the present invention.

FIG. 21 is a waveform chart of each part of FIG. 20.

22 is a circuit diagram showing a modified example of FIG.

FIG. 23 is a diagram showing the circuit operation of FIG. 22.

FIG. 24 is a circuit diagram showing a power supply device according to a tenth embodiment of the present invention.

FIG. 25 is a circuit diagram showing a power supply device according to an eleventh embodiment of the present invention.

FIG. 26 is a diagram for explaining the operation of FIG. 25.

FIG. 27 is a circuit diagram showing a power supply device according to a twelfth embodiment of the present invention.

FIG. 28 is a diagram illustrating the operation of FIG. 27.

FIG. 29 is a view for explaining a problem when the filament is broken.

FIG. 30 is a circuit diagram showing a power supply device according to a thirteenth embodiment of the present invention.

FIG. 31 is a view for explaining the operation of FIG. 30;

FIG. 32 is a circuit diagram showing a power supply device according to a fourteenth embodiment of the present invention.

FIG. 33 is a diagram illustrating the operation of FIG. 32.

FIG. 34 is a circuit diagram showing a power supply device according to a fifteenth embodiment of the present invention.

FIG. 35 is a view for explaining the operation of FIG. 34;

FIG. 36 is a diagram for explaining the operation of FIG. 34.

FIG. 37 is a view for explaining the operation of FIG. 34.

FIG. 38 is a view for explaining a problem when the lamp is pulled out.

FIG. 39 is a circuit diagram showing a power supply device according to a sixteenth embodiment of the present invention.

FIG. 40 is a circuit diagram showing a discharge lamp lighting device according to a seventeenth embodiment of the present invention.

FIG. 41 is a circuit diagram showing a discharge lamp lighting device according to an eighteenth embodiment of the present invention.

FIG. 42 is a circuit diagram showing a discharge lamp lighting device according to a nineteenth embodiment of the present invention.

FIG. 43 is a block diagram showing a conventional power supply device.

FIG. 44 is a block diagram showing a conventional power supply device for improving the power factor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... AC power supply 2 ... Rectifier 3 ... 1st switching device 4 ... 2nd switching device 5 ... Control circuit 6 ... Inductor 7 ... Discharge lamp 8 ... Drive transformer 9 ... VL detection circuit 10 ... IL detection circuit 11, 11A ... Latch holding means 12 ... Inverter 13 ... Filament mounting detection means

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[Procedure amendment]

[Submission date] October 7, 1996

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG. 40

[Procedure amendment 2]

[Document name to be amended] Drawing

[Correction target item name] FIG. 41

[Correction method] Change

[Correction contents]

FIG. 41

[Procedure 3]

[Document name to be amended] Drawing

[Correction target item name] FIG. 42

[Correction method] Change

[Correction contents]

FIG. 42

Claims (13)

[Claims] 1. A rectifier for rectifying the voltage of an AC power supply; an inverter for converting the rectified voltage from the rectifier into an AC voltage having a frequency higher than the output frequency of the rectifier using a switching device and an inductor; A control circuit for controlling the output of the inverter; a load driven by the output of the inverter; an abnormality detecting means for detecting an abnormality of the load; a mounting detecting means for detecting mounting of the load; a state in which the load is mounted In the case where the abnormality detecting means detects a load abnormality, the output reduction holding means for reducing the output of the inverter to the lower limit by using the control circuit; and the attachment detecting means detects that the load is not attached. In this case, means for canceling the operation of the output reduction holding means and controlling the output of the inverter so as to become a set constant value; Power supply. 2. A rectifier for rectifying the voltage of an AC power supply; an inverter for converting the rectified voltage from the rectifier into an AC voltage having a frequency higher than the output frequency of the rectifier by using a switching device and an inductor; A control circuit for controlling the output of the inverter; a load driven by the output of the inverter; an abnormality detecting means for detecting an abnormality of the load; a mounting detecting means for detecting mounting of the load; a state in which the load is mounted In the case where the abnormality detecting means detects a load abnormality, or when the mounting detecting means detects that the load is not mounted, the output of the inverter is set to a constant value set using the control circuit. And a means for controlling so that the power supply device is provided. 3. A rectifying device for rectifying the voltage of an AC power supply; first and second switching devices connected in series with each other, and first and second capacitors connected in parallel to these devices, respectively. An inductor for high frequency output provided in series between a midpoint of the first and second switching devices and a midpoint of the first and second capacitors, and a drive of the first and second switching devices Equipped with a transformer for
The first capacitor has a larger capacity than the second capacitor, and the second capacitor and the inductor are in a relationship of resonating according to ON / OFF of the first and second switching devices. A self-exciting bridge-type inverter that converts the rectified voltage from the rectifying device into an AC voltage having a frequency higher than the output frequency of the rectifying device by alternately turning on and off the second switching device; A load to be driven; an abnormality detecting means for detecting an abnormality of the load; a switching operation of the first switching device can be controlled, and an output of the inverter can be controlled. A first control circuit that reduces the output of the inverter to a lower limit based on a load abnormality detection signal; and a switch of the second switching device. Power supply, characterized in that provided with the; control the quenching operation, a second control circuit capable of controlling an output of the inverter. 4. A rectifying device for rectifying the voltage of an AC power supply; first and second switching devices connected in series with each other, and first and second capacitors connected in parallel to these respectively. An inductor for high frequency output provided in series between a midpoint of the first and second switching devices and a midpoint of the first and second capacitors, and a drive of the first and second switching devices Equipped with a transformer for
The first capacitor has a larger capacity than the second capacitor, and the second capacitor and the inductor are in a relationship of resonating according to ON / OFF of the first and second switching devices. A self-exciting bridge-type inverter that converts the rectified voltage from the rectifying device into an AC voltage having a frequency higher than the output frequency of the rectifying device by alternately turning on and off the second switching device; A load to be driven; an abnormality detecting means for detecting an abnormality of the load; a holding means for latching a load abnormality detection signal from the load abnormality detecting means; a switching operation of the first switching device; The output of the inverter can be controlled based on the load abnormality detection signal from the holding means. In a first control circuit for reducing; controls the switching operation of said second switching device,
A second control circuit capable of controlling the output of the inverter; 5. A rectifying device for rectifying the voltage of an AC power supply; first and second switching devices connected in series with each other, and first and second capacitors respectively connected in parallel with them. An inductor for high frequency output provided in series between a midpoint of the first and second switching devices and a midpoint of the first and second capacitors, and a drive of the first and second switching devices Equipped with a transformer for
The first capacitor has a larger capacity than the second capacitor, and the second capacitor and the inductor are in a relationship of resonating according to ON / OFF of the first and second switching devices. A self-exciting bridge-type inverter that converts the rectified voltage from the rectifying device into an AC voltage having a frequency higher than the output frequency of the rectifying device by alternately turning on and off the second switching device; A load to be driven; an abnormality detecting means for detecting an abnormality of the load; a holding means for latching a load abnormality detection signal from the load abnormality detecting means; a mounting detecting means for detecting mounting of the load; Means for releasing the latch of the holding means when it detects that the load is not mounted; and a switching operation of the first switching device. The output of the inverter can be controlled and the output of the inverter is reduced to the lower limit based on the load abnormality detection signal from the holding means, while the mounting detection means does not load the load. When it is detected, the first control for reducing the output of the inverter to the lower limit based on the load non-mounting detection signal from the mounting detection unit instead of the load abnormality detection signal from the load abnormality detection unit. And a second control circuit capable of controlling the switching operation of the second switching device and controlling the output of the inverter. 6. The power supply device according to claim 3, wherein the second control circuit includes adjusting means for determining the output of the inverter. 7. The third control circuit comprises means for shifting the output of the inverter by one step based on a load abnormality detection signal from the abnormality detection means. The power supply device according to any one of 1. 8. A rectifier for rectifying a voltage of an AC power supply; an inverter for converting a rectified voltage from the rectifier into an AC voltage having a frequency higher than an output frequency of the rectifier by using a switching device; A first power supply circuit that creates a DC power supply voltage from the output and outputs the DC power supply voltage;
A control circuit that operates by the DC power supply voltage from the power supply circuit to control the output of the inverter; a plurality of discharge lamps that are driven by the output of the inverter; and a plurality of discharge lamps that respectively detect abnormalities in the plurality of discharge lamps. Abnormality detecting means; the plurality of notification lamps to which the DC power supply voltage from the first power supply circuit is introduced at one end; Output reduction holding means for reducing the electric power supplied from the first power supply circuit to the control circuit to reduce or stop the output of the inverter by setting the state; and the output reduction holding means provided on the AC power supply side and the inverter rather than the inverter. A second power supply circuit that creates a power supply voltage from the output of the previous stage that is supplied to the inverter and guides it to one end of the plurality of notification lamps;
A discharge lamp lighting device comprising: 9. A rectifier for rectifying the voltage of an AC power supply; an inverter for converting the rectified voltage from the rectifier into an AC voltage having a frequency higher than the output frequency of the rectifier using a switching device; and the DC power supply. A power supply circuit that creates and outputs a voltage; a control circuit that operates by a DC power supply voltage from the power supply circuit and controls the output of the inverter;
A plurality of discharge lamps driven by the output of the inverter;
A plurality of abnormality detecting means for detecting abnormality of each of the plurality of discharge lamps; a plurality of notification lamps to which a DC power supply voltage from the first power supply circuit is introduced at one end; and a plurality of abnormality detecting means for detecting abnormality If detected, output reduction holding means for reducing the power output from the power supply circuit to the control circuit to reduce or stop the output of the inverter by turning on the plurality of notification lamps respectively; A discharge lamp lighting device, comprising: a system-off circuit that causes the output reduction / holding means to release the latch of the plurality of notification lamps in an on state by an operation. 10. A rectifying device for rectifying the voltage of an AC power supply;
An inverter that converts a rectified voltage from the rectifier device into an AC voltage having a frequency higher than the output frequency of the rectifier device using a switching device; a power supply circuit that creates and outputs the DC power supply voltage; A control circuit which is operated by a DC power supply voltage and controls the output of the inverter; a plurality of discharge lamps driven by the output of the inverter; a plurality of abnormality detection means for detecting abnormality of each of the plurality of discharge lamps; A plurality of notification lamps to which a DC power supply voltage from the first power supply circuit is introduced at one end; and when the plurality of abnormality detection means detect an abnormality, by turning on the plurality of notification lamps, respectively. Output reduction holding means for reducing the power supplied from the power supply circuit to the control circuit to reduce or stop the output of the inverter; Ri performs system off operation, while reducing or stopping the output of the inverter reduces the power supplied to the control circuit from the power supply circuit,
A system-off circuit for releasing the latching of the plurality of notification lamps in the on state to the output reduction and holding means; and a mounting detection means for detecting mounting of the plurality of discharge lamps. In a case where it is detected that the plurality of abnormality detecting means are not attached, when all of the plurality of abnormality detecting means do not detect an abnormality, the system off circuit is caused to perform a system off operation, and at least one of the plurality of abnormality detecting means is used. And a mounting detection control circuit for stopping the system-off operation by the system-off circuit when one detects an abnormality. 11. A discharge lamp lighting device, comprising: the power supply device according to claim 1; and a discharge lamp that is energized by an output of the power supply device. . 12. The discharge lamp lighting device according to claim 8, wherein the discharge lamp is provided with an impedance element in parallel between the filament terminals. 13. A lighting device comprising: a lighting device main body; and the discharge lamp lighting device according to claim 11 or 12.