JP4525446B2 - Discharge lamp lighting device and lighting fixture - Google Patents

Description

  The present invention relates to a discharge lamp lighting device that uses a plurality of types of high-pressure discharge lamps as compatible lamps, and a lighting fixture using the same.

  Conventionally, as a high-pressure discharge lamp lighting device for lighting a high-pressure discharge lamp (HID lamp), a copper-iron type ballast has been mainly used. However, in recent years, electronic ballasts using many electronic components aimed at reducing the weight, size and function of ballasts are becoming mainstream. This electronic ballast will be briefly described below.

  FIG. 15 shows a block diagram of an electronic ballast. A DC power supply circuit section A including a rectifier circuit is connected to the AC power supply Vs, an inverter circuit section B capable of adjusting and controlling the power supplied to the discharge lamp is connected to the output terminal, and a discharge lamp DL is connected to the output terminal. Has been. The inverter circuit unit B converts the output of the DC power supply circuit unit A into a low-frequency AC voltage and supplies it to the discharge lamp DL, and controls the operation of the lighting circuit unit C according to the state of the discharge lamp DL. And a control circuit unit D for performing the above.

  In such a conventional lighting device, when lighting an HID lamp having different characteristics, it is necessary to use a high-pressure discharge lamp lighting device suitable for the lamp to be lit. In other words, a dedicated high-pressure discharge lamp lighting device must be provided for each discharge lamp having different characteristics, and the investment in terms of development cost, development period, and the like was great. For these reasons, the high-pressure discharge lamp lighting device has been desired to have a performance capable of lighting a plurality of types of HID lamps.

Therefore, Japanese Patent Application Laid-Open No. 2003-229289 proposes a high-pressure discharge lamp lighting device for a plurality of types of HID lamps, and measures the time until the tube voltage of the HID lamp exceeds a predetermined threshold value. Thus, a means for discriminating the load type is introduced.
JP 2003-229289 A

  Japanese Patent Application Laid-Open No. 2003-229289 discloses various lamp discrimination methods. However, there is no description of a method for discriminating lamp types using a plurality of types of lamp discrimination methods. Here, a method for discriminating the lamp with higher accuracy is disclosed.

  For example, in a discharge lamp lighting device capable of lighting a plurality of types of HID lamps, when the target lamps are CDM-35 and CDM-70 manufactured by PHILIP, The light is lit at 35 W or 70 W depending on the determination result of the one type of determination method. When this discrimination method is one type, the lamp type can be most easily discriminated, but on the other hand, when there are a large number of target lamps, the possibility of erroneous discrimination increases. This is because even if the lamps of each lamp manufacturer have the same rated power, there are differences in various points such as color temperature, arc tube shape, and encapsulating material.

  FIG. 8 shows the behavior of the lamp voltage after starting the lamps of CDM-35 and CDM-70. As shown in FIG. 8, between the CDM-35 and the CDM-70, there is a difference in how the ramp voltage rises, so that it is possible to determine the lamp type in the transient state of the ramp voltage rise. On the other hand, as shown in FIG. 9, it can be seen that the CDM-35 and OSRAM HCI-70 are very similar to each other when the rise characteristics of the lamp voltage after starting the lamp are compared. That is, in the combination of lamps in FIG. 9, it is difficult to determine the lamp type in the transient state of the ramp-up voltage as in the combination in FIG.

  Although such rated lamp power is different, it is necessary to accurately discriminate even lamps having relatively similar characteristics. As the method, a discrimination method using a plurality of discrimination methods can be considered.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a discharge lamp lighting device capable of accurately discriminating a lamp type by using a plurality of types of discrimination methods.

According to the present invention, in order to solve the above-described problems, a power conversion circuit that converts power from a DC power source and supplies power to a high-pressure discharge lamp, and a lighting control circuit that controls supply power of the power conversion circuit, A high-pressure discharge lamp of a plurality of rated power types, comprising: a determination means for detecting the electrical characteristics of the discharge lamp by a plurality of detection means and determining the rated power of the discharge lamp from the plurality of electrical characteristics detected from the plurality of detection means Is a discharge lamp lighting device that lights up with any one of them connected, and the discriminating means raises the lamp voltage from the first voltage to the second voltage after starting the discharge lamp. First determining means for determining whether or not the time required for the discharge is longer than a threshold value, and whether the lamp voltage at the first lighting power when the discharge lamp is stable is greater than the lamp voltage at the second lighting power Second discriminator to determine whether or not Wherein the door, each of the plurality of kinds of high-pressure discharge lamp as a load object, advance to correspond to the pattern of the combination of the determination result by the determination result by the first discriminating means second discriminating means, said plurality of determination The connected discharge lamp type is determined based on the combination pattern of the results determined from the means.

  According to the present invention, the electrical characteristics of the discharge lamp are detected by the plurality of detection means, and the determination means for determining the rated power of the discharge lamp from the plurality of electrical characteristics detected from the plurality of detection means is provided. Since the connected discharge lamp type is discriminated based on the combination pattern of the discriminated result, there is an effect that the lamp type can be discriminated with high accuracy.

(Embodiment 1)
FIG. 1 shows a circuit diagram of Embodiment 1 of the present invention. For example, a DC voltage obtained by rectifying and smoothing a commercial AC power supply by a boost chopper circuit is applied to the electrolytic capacitor C01. As shown in FIG. 2, this DC voltage is generally the lamp end-to-end voltage (no-load secondary voltage) V02 = about 300V, which is required for starting the HID lamp.

  The control power supply circuit 1 is composed of a series circuit of step-down resistors R01 and R02 and Zener diodes ZD1 and ZD2, and generates voltages Vcc1 and Vcc2 to be supplied to the control circuit.

  The step-down chopper circuit 2 includes a switching element Q01, a regenerative diode D01, an inductor L01, and a capacitor C02. When the switching element Q01 switches at a high frequency, the DC voltage stored in the electrolytic capacitor C01 is necessary for the lamp DL. Convert to electricity.

  The polarity inversion circuit 3 includes a full bridge circuit of switching elements Q02, Q03, Q04, and Q05, and converts the DC voltage of the capacitor C02 of the step-down chopper circuit 2 to a low frequency of several tens Hz to several hundreds Hz.

  The igniter circuit 4 includes a pulse transformer and a pulse generation circuit, and generates a high-pressure pulse (about 3 to 5 kV) necessary for starting the lamp.

  The constant WLa circuit 5 detects the lamp power by detecting the current value supplied to the load side from the constant voltage of the electrolytic capacitor C01 by the resistor R05, converts it to an arbitrary voltage value by the amplifier circuit OP1, and the resistance R1 It is converted into a DC voltage by a DC conversion circuit comprising a capacitor C1. The converted DC voltage value is compared with the value obtained by converting the PWM signal output from the microcomputer into the DC voltage value by the resistor R2 and the capacitor C2, by the error amplifier OP2. The comparator CP2 compares the voltage value output by comparison with the triangular wave high-frequency signal generated by the high-frequency oscillation circuit 7, thereby generating a drive signal for the switching element Q01 of the step-down chopper circuit 2. A Zener diode connected to the output terminal of the constant WLa circuit 5 determines the maximum value of the output voltage of the error amplifier OP2.

  Further, the constant Ila circuit 6 controls the lamp current Ila at a low impedance immediately after the lamp DL is started. This circuit detects the current value flowing through the lamp DL by detecting the current value flowing through the lamp DL by the resistor R06 and calculating the difference between the detected value and the voltage value detected by the resistor R05. . That is, since the reference ground of this circuit is provided on the negative potential side of the electrolytic capacitor C01, the resistor R06 has not only the lamp current value but also the discharge current value from the electrolytic capacitor C01 detected by the resistor R05. In order to detect this, the current flowing through the lamp DL is detected by calculating the difference between the value detected by the resistor R05 and the value detected by the resistor R06 by the differential amplifier OP3.

  Next, the switching element Q01 of the step-down chopper circuit 2 is controlled by converting the detected voltage into a DC voltage by a DC conversion circuit comprising a resistor R3 and a capacitor C3 and comparing it with a reference voltage value obtained by dividing Vcc1. .

  FIG. 3 shows output characteristics of a general 70 W HID lighting circuit. The constant Ila circuit 6 controls a constant Ila region of Vla <60V in FIG. 3, and the constant Wla circuit 5 controls a constant Wla region of Vla ≧ 60V.

  The high-frequency oscillation circuit 7 is composed of comparators CP1, CP2, CP3, a CR charge / discharge circuit, etc., and oscillates a high-frequency signal for on / off control of the switching element Q01 of the step-down chopper circuit 2, The width is controlled to receive the outputs of the constant Wla circuit 5 and the constant Ila circuit 6 and realize the output characteristics of FIG.

  The discharge lamp discrimination circuit 8 detects the lamp voltage of the discharge lamp DL and discriminates a plurality of types of discharge lamps. For example, it is composed of a general-purpose microcomputer such as PIC12F675 (8-bit microcomputer with A / D conversion function / flash memory) manufactured by Microchip, and the lamp voltage is monitored by monitoring the voltage at the voltage dividing points of the resistors R03 and R04. 3 is made variable, and the pulse width of the PWM signal output to the CR integrating circuit of the capacitor C2 and the resistor R2 is made variable according to the detected value, so that the constant Wla region of Vla ≧ 60V in FIG. 3 is realized. I have control. The PWM signal is output from the second pin of the microcomputer. The first pin is a power supply terminal, and the eighth pin is a ground terminal. Furthermore, the 7th pin is set as an input, and reads the lamp voltage value obtained from the voltage across the capacitor C02.

  FIG. 3 illustrates the output characteristics when it is determined that the lamp is a 70 W lamp. However, when it is determined that the lamp is a 35 W lamp, a capacitor is connected from the microcomputer so that the output characteristic in the constant Wla region is a lamp power of 35 W. The pulse width of the PWM signal output to the CR integrating circuit of C2 and resistor R2 is changed. Also, when switching the lighting power for lamp type determination, the pulse width of the PWM signal output from the microcomputer to the CR integration circuit of the capacitor C2 and the resistor R2 is changed.

  Next, a specific lamp determination method will be described.

(Determination method 1)
FIG. 10 shows the rising characteristics of the lamp voltage after starting the lamps of 35W and 70W lamps of various manufacturers and various shapes. FIG. 11 shows the elapsed time from Vla = 30 V to Vla = 40 V obtained from FIG. As apparent from FIG. 11, it can be seen that a 35 W lamp and a 70 W lamp can be discriminated on the basis of about 6 seconds.

  However, as shown in FIG. 9, the OSRAM HCI-70 lamp exhibits a rise characteristic substantially equivalent to that of the 35 W lamp. FIG. 12 shows the elapsed time from Vla = 30 to 40V when the HCI-70W lamp is included. In FIG. 12, as described above, even if a threshold value for discriminating between a 35 W lamp and a 70 W lamp is set in about 6 seconds, a part of the HCI lamp can be discriminated as a 70 W lamp, but a part thereof is a 35 W lamp. And misclassified.

(Determination method 2)
Therefore, the discrimination method 2 shown in FIG. 13 is used. FIG. 13 shows lamp voltages at various lighting powers when the 35 W lamp and 70 W lamp of each company are stable. From FIG. 13, the method of changing the lamp voltage with the lighting power Wla = 40 to 33 W is detected. That is, in the 70 W lamp, if the difference in lamp voltage between the lighting power of 40 W and 33 W is taken, Vla40−Vla33 becomes smaller than zero, and in the 35 W lamp, it becomes positive. In other words, it is possible to determine the lamp type based on how the lamp voltage changes.

  Table 1 shows the discrimination results of Discrimination Method 1 and Discrimination Method 2 when CDM-35, CDM-70, and HCI-70 are the target loads. In Table 1, some HCI lamps can be discriminated as 70 W by the discriminating method 1, but here, the HCI-70 is discriminated as a 35 W lamp by the discriminating method 1.

  That is, such a discrimination pattern appears for each target lamp. By discriminating using this discrimination pattern, it is possible to discriminate more lamps and improve discrimination accuracy.

  The discrimination flow of this embodiment is shown in FIG. Step # 1 is a lamp start determination. When it is detected that the lamp voltage has dropped or the lamp current starts to flow, the lamp start is determined. In step # 2, discrimination method 1 is performed. That is, the elapsed time from the lamp voltage Vla of 30V to 40V is measured. From the measurement result, it is discriminated whether it is a 35 W lamp or a 70 W lamp with a boundary of about 6 seconds, and the discrimination result 1 is stored in step # 3. In step # 4, discrimination method 2 is performed. That is, the lamp voltages at the lighting powers of 40 W and 33 W are compared to determine whether the lamp is a 35 W lamp or a 70 W lamp from the magnitude relationship, and the determination result 2 is stored in step # 5. In steps # 6, # 7, and # 8, the discrimination results 1 and 2 are referred to, and the lamp types of CDM-70, CDM-35, and HCI-70 are discriminated based on Table 1.

  In addition, when the discrimination results of the discrimination method 1 and the discrimination method 2 are different from the assumed discrimination result pattern as shown in Table 1, the smallest electric power among the high-pressure discharge lamps to be loaded (35 W in this example) You may make it light by.

(Embodiment 2)
A second embodiment of the present invention will be described with reference to FIG. Since the ballast in the present embodiment is the same as that used in the first embodiment, a duplicate description is omitted.
In this embodiment, as shown in FIG. 5, when the discrimination results of the discrimination method 1 and the discrimination method 2 are different from the assumed discrimination result pattern as shown in Table 1, the same discrimination method is repeated again. It is set. The example in Table 1 is a determination method at the time of starting the lamp. Therefore, after the lamp is turned off, the determination is performed again. However, for example, when the determination is performed at the time of stable lighting, it is not necessary to turn off the lamp. When the determination method is used, it goes without saying that the determination may be made again without turning off the light.
(Embodiment 3)

Embodiment 3 of the present invention will be described with reference to FIG. Since the ballast in the present embodiment is the same as that used in the first embodiment, a duplicate description is omitted.
In the present embodiment, as shown in FIG. 6, if the discrimination results of the discrimination method 1 and the discrimination method 2 are different from the assumed discrimination result pattern as shown in Table 1, the determination method 1 is not re-executed. No, start again from the discrimination method 2. By doing so, re-discrimination becomes possible earlier than in the second embodiment.

(Embodiment 4)
A fourth embodiment of the present invention will be described with reference to FIG. Since the ballast in the present embodiment is the same as that used in the first embodiment, a duplicate description is omitted.
In the present embodiment, unlike the previous embodiments, if the discrimination results of the discrimination method 1 and the discrimination method 2 are different from the assumed discrimination result pattern as shown in Table 1, it is turned on at a certain power level or again. It does not make any distinction and turns off. By controlling in this way, it is possible to avoid lighting with incorrect power as much as possible.

(Embodiment 5)
FIG. 14 shows a structural example of a lighting fixture using the discharge lamp lighting device of the present invention. (A), (b) is an example applied to a spotlight, (c) is an example applied to a downlight. In the figure, 11 is an electronic ballast storing a circuit of a lighting device, and 12 is a high pressure discharge lamp. The lamp body 13 is a wiring. In any lighting fixture, a plurality of types of high-pressure discharge lamps such as 35 W and 70 W can be appropriately selected and mounted. A plurality of these lighting fixtures may be combined to construct an illumination system, and a plurality of different types of high-pressure discharge lamps may be used in combination depending on the required illuminance, emission color, design, and the like.

It is a circuit diagram which shows the circuit structure of Embodiment 1 of this invention. It is a wave form diagram which shows the no-load secondary voltage of Embodiment 1 of this invention. It is a characteristic view which shows the output characteristic of Embodiment 1 of this invention. It is a flowchart which shows operation | movement of Embodiment 1 of this invention. It is a flowchart which shows operation | movement of Embodiment 2 of this invention. It is a flowchart which shows operation | movement of Embodiment 3 of this invention. It is a flowchart which shows operation | movement of Embodiment 4 of this invention. It is a characteristic view which shows the representative example of the lamp voltage rising characteristic at the time of a start. It is a characteristic view which shows another example of the lamp voltage rising characteristic at the time of starting. It is a figure which shows the measurement result of the lamp voltage rise characteristic at the time of a start. It is explanatory drawing which shows an example of a lamp classification discrimination method. It is explanatory drawing which shows the subject of the lamp classification discrimination method of FIG. It is explanatory drawing which shows another example of lamp | ramp classification discrimination. It is a perspective view which shows the external appearance of the lighting fixture of this invention. It is a block diagram of the conventional lighting device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Control power supply circuit 2 Step-down chopper circuit 3 Polarity inversion circuit 4 Igniter circuit 5 Constant Wla circuit 6 Constant Ila circuit 7 High frequency oscillation circuit 8 Discharge lamp discrimination circuit

Claims (6)

A power conversion circuit that converts power from a DC power source and supplies power to the high-pressure discharge lamp, a lighting control circuit that controls power supplied to the power conversion circuit, and electrical characteristics of the discharge lamp are detected by a plurality of detection means, And a discrimination means for discriminating the rated power of the discharge lamp from a plurality of electrical characteristics detected from a plurality of detection means. The high-pressure discharge lamp of a plurality of rated power types is a load object, and one of them is connected and lit. In the discharge lamp lighting device, the determination means determines whether the time required for the lamp voltage after starting the discharge lamp to rise from the first voltage to the second voltage is longer than a threshold value. And a second discriminating unit for discriminating whether or not the lamp voltage at the first lighting power when the discharge lamp is stable is larger than the lamp voltage at the second lighting power, Multiple types of high-pressure discharge lamps For each, in advance to correspond to the pattern of the combination of the determination result by the determination result by the first discriminating means second discriminating means, is connected based on the pattern of the combination of the result of the discrimination from the plurality of discriminating means A discharge lamp lighting device characterized by determining a type of a discharge lamp. The discharge lamp lighting device according to claim 1, wherein the combination pattern of the results discriminated from the plurality of discriminating means is a load target when the pattern does not match any of a plurality of types of high-pressure discharge lamps to be loaded. A discharge lamp lighting device characterized by being lit with the smallest electric power among high-pressure discharge lamps. 2. The discharge lamp lighting device according to claim 1, wherein when the combination pattern determined by the plurality of determination means is not suitable for any of a plurality of types of high-pressure discharge lamps to be loaded, the determination is performed again. A discharge lamp lighting device characterized by that. 2. The discharge lamp lighting device according to claim 1, wherein the combination pattern of the results determined by the plurality of determination means does not match any of the plurality of types of high-pressure discharge lamps to be loaded. A discharge lamp lighting device characterized by re-determination from the middle of the lamp. 2. The discharge lamp lighting device according to claim 1, wherein when the combination pattern of the results determined by the plurality of determining means is not suitable for any of the plurality of types of high-pressure discharge lamps to be loaded, the discharge lamp is turned off. A discharge lamp lighting device characterized by: A lighting fixture comprising the discharge lamp lighting device according to any one of claims 1 to 5.

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