KR100639483B1 - electrodeless discharge lamp electric source apparatus - Google Patents

Abstract

The power supply device of the electrodeless discharge lamp of the present invention is to boost the rectified voltage rectified AC power to generate an intermittent ground current to the ground to output the boosted voltage by the electromagnetic induction action by the boosting coil and Control the boosted voltage so that the boosted voltage has a constant voltage value by varying the pulse width of the interrupted ground current by the divided rectified voltage, and change the pulse width of the interrupted ground current by the rectified current monitor voltage and the reference voltage. The phase control voltage stabilizer is configured to reduce the phase difference between the rectified voltage and the rectified current by controlling the phase of the rectified current flowing through the coil.

According to the present invention, even when the voltage of the AC power supply is changed or the internal impedance of the electrodeless discharge lamp is changed, a boosted voltage having a stable value is always generated to obtain a high frequency interrupted current that is a stable high frequency driving power suitable for the rated power, and the brightness is stable. It is possible to achieve high brightness illumination, and to match the phase of rectified voltage and rectified current so that the power factor is close to 1 to control the effective power of the high frequency driving power supply to the maximum, which has high brightness and saves energy. It is possible to prevent the generation of harmonics in the rectified current, which can greatly reduce the generation of high frequency electromagnetic induction noise.

Electrodeless discharge lamp, step-up voltage, pulse width modulation, power factor, intermittent current

Description

Electrodeless discharge lamp electric source apparatus

1 is a configuration diagram of a power supply device of an electrodeless discharge lamp of the present invention;

2 is a configuration diagram of a phase control voltage stabilization unit;

3 is a signal waveform diagram of a phase control voltage stabilization unit.

* Explanation of symbols for main parts of the drawings

CMP ... AC power supply A ...

B ... high frequency switching part DB ... full-wave rectifier

XL ... step-up coils Q1, Q2, Q3 ... 1st, 2nd, 3rd switch

Dr. Rectifier Diode Vi ...

Cs ... Smoothing Capacitor Lw ... Corrugation Coil

LD _coil ... Excited coil (electrodeless discharge lamp) VRphase ... Phase control voltage stabilizer

GS _RF ... first switch control signal Inv-GS _RF ... second switch control signal

Is1, Is2 ... High frequency interrupted current Vd ... Rectified voltage

IBr ... rectified current Is ... interrupted ground current

VB ... step-up voltage PWM ... pulse width modulated signal

Vf ... voltage booster voltage Vpha ... voltage booster voltage

Idet ... rectified current monitor voltage Isen ... interrupted current monitor voltage

Vm ... Differential voltage 10 ... Integrator

11 ... subtraction part 12, 13 ... 1st, 2nd comparator

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device for an electrodeless discharge lamp. In particular, the electrodeless discharge lamp, which is used as a high brightness lighting device, is lighted with high efficiency, and when the electrodeless discharge lamp is turned on, the boosted voltage is rapidly increased to produce the electrodeless discharge lamp. The present invention relates to a power supply device for an electrodeless discharge lamp having low noise, which can be stably lit and prevent the brightness of a flashing light from changing.

In the past, incandescent lamps and fluorescent lamps were mainly used as lightings, but the demand for the use of electrodeless discharge lamps having high brightness and long-term use is rapidly increasing in accordance with social needs such as saving power, saving resources, and improving brightness in living environments. It is increasing.

Since a high voltage power source having a high frequency is required to turn on the electrodeless discharge lamp, a power supply device for switching a high voltage boosted from a commercial AC power source to a high frequency signal is used. In order to reduce the cost and size of the power supply, instead of using a large power transformer that boosts the commercial power, the commercial power is rectified and then switched off by a switch, and the voltage is boosted to a high voltage. An inverter for converting or converting is required, which is disclosed in Japanese Patent Laid-Open No. 9-237687.

In the power supply apparatus of the conventional electrodeless discharge lamp, the impedance of the electrodeless discharge lamp is changed by the discharge phenomenon after the electrodeless discharge lamp is turned on by the application of high voltage, and the brightness of the electrodeless discharge lamp is changed by the change of the impedance. Or flashing problems.

In addition, the power supply device of a conventional electrodeless discharge lamp is a problem that the electromagnetic induction noise is generated in the electrodeless discharge lamp when the voltage is boosted by switching or chopping at a high frequency, causing the malfunction of the equipment by affecting the surrounding broadcast receiving equipment or office equipment Have

In addition, the power supply device of the conventional electrodeless discharge lamp does not rapidly increase the boosted voltage when the electrodeless discharge lamp is turned on, so that the discharge start of the electrodeless discharge lamp becomes unstable, and the sudden large current is interrupted with the interruption of discharge. It has a problem that the high frequency noise is generated to flow to.

An object of the present invention is to maintain the boosted voltage applied to the electrodeless discharge lamp at a constant voltage even if the AC power, which is a commercial voltage, or the internal impedance is changed by the discharge phenomenon of the electrodeless discharge lamp. The phase difference of the rectified current is reduced, preferably zero, so as to maximize the efficiency of the power supply device of the electrodeless discharge lamp, so that the electrodeless lamp can be stably lit and emit light with high efficiency. To provide a device.

According to another object of the present invention, even if the AC power source, which is a commercial voltage, is changed due to various factors or the driving impedance is changed by the discharge change of the electrodeless discharge lamp, the first switch is controlled on / off using a pulse width modulated signal to increase the boosted voltage. It is possible to have a constant voltage and to accurately control the boosted voltage, so that the brightness of the electrodeless discharge lamp can be maintained stably, and the on / off of the first switch is controlled by the pulse width modulation signal so that the electrodeless discharge lamp can be controlled. It is to provide a power supply device of an electrodeless discharge lamp that can reduce the generation of high frequency electromagnetic induction noise by reducing the phase difference between the rectified voltage and the rectified current of the boosted voltage supplied.

It is still another object of the present invention to control the voltage control voltage stabilization part to have a constant voltage by increasing the voltage up to a constant voltage by the pulse width modulation signal, and at the same time to control the phase of the rectified voltage and the rectified current. Since the phase control voltage stabilization part including the first switch can be digitalized, the integrated circuit (IC) can be integrated into a single chip. To provide a power supply.

Still another object of the present invention is to stably and quickly turn on the electrodeless discharge lamp by stably increasing the boost voltage at the time of starting the electrodeless discharge lamp or changing the discharge of the electrodeless lamp. The present invention provides a power supply device for an electrodeless discharge lamp that can prevent the brightness of a blinking lamp from being changed due to a change in the lamp discharge.

In order to achieve the above object, a power supply device of an electrodeless discharge lamp of the present invention is a power supply device of an electrodeless discharge lamp that supplies a high frequency current to the excitation coil to excite the electrodeless discharge lamp by the electromagnetic induction action of the excitation coil. Boosting means for interrupting the rectified voltage of the rectified AC power to generate an intermittent ground current to the ground to output the boosted voltage by an electromagnetic induction action by the boosting coil; And the divided voltage boost voltage obtained by dividing the boosted voltage, the divided voltage rectified voltage divided by the rectified voltage, the rectified current monitor voltage and the reference voltage which monitor the rectified current flowing through the boosted coil, and receiving the divided voltage by the divided voltage boosted voltage and the divided voltage rectified voltage. The boost voltage is controlled so that the boost voltage has a constant voltage value by varying the pulse width of the pulse width. It characterized in that it comprises a phase control voltage stabilization means for controlling to reduce the phase difference between the rectified voltage and the rectified current.

In addition, in order to achieve the above object, the power supply device of the electrodeless discharge lamp of the present invention supplies a high frequency current to the excitation coil to the power supply device of the electrodeless discharge lamp to excite the electrodeless discharge lamp by the electromagnetic induction action of the excitation coil. A full-wave rectifying means for receiving an AC power and full-wave rectifying the AC power to output a rectified voltage; First switching means for interrupting the intermittent ground current flowing from the rectified voltage to the ground by turning the rectified voltage to ground by turning on or off according to the pulse width modulation signal; A boost coil having one end connected to the rectified voltage and the other end connected to the first switch means to generate an electromotive voltage by electromagnetic induction according to the interruption of the intermittent ground current by turning on or off the first switch means; A rectifying diode for voltage rectifying the electromotive voltage; A capacitor for outputting a boosted voltage by smoothing the output voltage of the rectifier diode; Pulse width modulated signal having a variable pulse duty corresponding to the voltage difference between the divided voltage step-up voltage divided by the boosted voltage and the intermittent current monitor voltage monitoring the interrupted ground current, and the phase difference between the rectified voltage and the rectified current flowing through the boosted coil. A phase control voltage stabilization means for outputting the voltage to maintain the boosted voltage to have a constant voltage value and bring the phase of the rectified current closer to the phase of the rectified voltage; And second and third switch means connected in series with respect to the boosted voltage by receiving a first switch control signal having a predetermined frequency and a second switch control signal whose polarity is inverted from the first switch control signal. It is characterized in that it comprises a high frequency inverter which conducts and cuts alternately every half cycle according to two switch control signals to generate a high frequency interrupted current, and a high frequency interrupted current flows through the excitation coil.

The phase control voltage stabilization means receives the divided voltage boosted voltage obtained by dividing the boosted voltage according to the magnitude of the resistance value and the divided voltage rectified voltage obtained by dividing the rectified voltage according to the magnitude of the resistance value, and subtracts the divided voltage rectified voltage from the divided voltage boosted voltage. Subtraction means for outputting a voltage; First comparing means for receiving an intermittent current monitor voltage and a differential voltage for monitoring the intermittent ground current and comparing the differential voltage and the intermittent current monitor voltage to output a voltage control pulse signal that is activated when the differential voltage is greater than the intermittent current monitor voltage; A second comparison that receives a rectified current monitor voltage and a reference voltage monitoring the rectified current flowing in the boosting coil, compares the reference voltage with the rectified current monitor voltage, and outputs a phase control pulse signal that is activated when the reference voltage is greater than the rectified current monitor voltage; Way; And a logical multiplication means for receiving the voltage control pulse signal and the phase control pulse signal and performing a logical multiplication of the received voltage control pulse signal and the phase control pulse signal to output a pulse width modulated signal for controlling the interrupted ground current. .

The phase control voltage stabilizing means further comprises an integrating means for integrating the divided rectified voltage so that the charge relaxation time of the divided rectified voltage is smaller than the discharge relaxation time of the divided rectified voltage.

Hereinafter, a power supply device of an electrodeless discharge lamp of the present invention will be described in detail with reference to the accompanying drawings.

1 is a configuration diagram of a power supply device of an electrodeless discharge lamp of the present invention.

The power supply device of the electrodeless discharge lamp of the present invention of Figure 1 receives the AC power (CMP), full-wave rectifying the AC power (CMP) to output a rectified voltage (Vd), a pulse width modulation signal ( PWM switch is turned on or off to flow the rectified voltage (Vd) to the ground to interrupt the intermittent ground current (Is) flowing from the rectified voltage (Vd) to the ground, one end of the rectified voltage (Vd) The other end is connected to the first switch Q1 to generate an electromotive voltage Vi by an electromagnetic induction action according to the interruption of the intermittent ground current Is by turning on or off the first switch Q1. Step-up coil (XL), rectifier diode (Dr) for voltage rectifying voltage (Vi), capacitor (Cs) for outputting boosted voltage (VB) by smoothing the output voltage of rectified diode (Dr), boosted voltage (VB) Voltage difference between positive step-up voltage (Vf) divided by voltage and intermittent ground current (Is) and intermittent current monitor voltage (Isen) Outputs a pulse width modulated signal PWM having a pulse duty varying in response to a phase difference between the voltage Vd and the rectified current IBr flowing in the boosting coil XL, so that the boosted voltage VB has a constant voltage value. And a phase control voltage stabilization unit VRphase for maintaining the phase of the rectified current IBr closer to the phase of the rectified voltage Vd, and a first switch control signal GS _RF having a predetermined frequency and a first switch control signal ( GS _RF ) receives the second switch control signal Inv-GS _RF whose polarity is inverted and connects the second and third switches Q2 and Q3 connected in series with the boosted voltage VB to the first and the second. Two high frequency interrupted currents Is1 and Is2 are generated by alternately conducting and blocking every half cycle according to the switch control signals GS _RF and Inv-GS _RF , and the high frequency interrupted currents Is1 and Is2 are excited coils (LD _Coil). It consists of the high frequency inverter B which flows into ().

With the above-described configuration, the power supply device of the electrodeless discharge lamp of the present invention can generate the pulse width modulation signal PWM even if the AC power source CMP is changed by various factors or the driving impedance is changed due to the discharge change of the electrodeless discharge lamp. It is possible to control the first switch Q1 on / off so that the boosted voltage VB can have a constant voltage, and the boosted voltage VB can be precisely controlled so that the brightness of the electrodeless discharge lamp can be stably maintained. The phase difference between the rectified voltage Vd and the rectified current IBr of the boosted voltage VB supplied to the electrodeless discharge lamp is controlled by controlling the on / off of the first switch Q1 to the pulse width modulated signal PWM. It is possible to reduce the occurrence of harmonics to reduce the generation of electromagnetic induction noise having a high frequency.

As shown in FIG. 2, the phase control voltage stabilization unit VRphase divides the voltage booster voltage Vf and the rectified voltage Vd by dividing the voltage booster voltage VB according to the magnitude of the resistance value. A subtractor 11 for receiving a divided rectified voltage Vpha and subtracting the divided rectified voltage Vpha from the divided boosted voltage Vf to output the differential voltage Vm, and the intermittent ground current Is monitored Receives the current monitor voltage (Isen) and the differential voltage (Vm), compares the differential voltage (Vm) and the intermittent current monitor voltage (Isen), and activates the voltage when the differential voltage (Vm) is greater than the intermittent current monitor voltage (Isen). The first comparator for outputting the pulse signal Vp, the rectified current monitor voltage Idet and the reference voltage Vref which monitor the rectified current IBr flowing through the boosting coil XL, receive the reference voltage Vref and rectified. It is activated when the reference voltage Vref is greater than the rectified current monitor voltage Idle by comparing the current monitor voltage Idle. The second comparator 13 outputting the phase control pulse signal Vq, the voltage control pulse signal Vp, and the phase control pulse signal Vq are received and the received voltage control pulse signal Vp and phase control pulse signal ( And a logical product 14 for outputting the pulse width modulated signal PWM for interrupting the intermittent ground current Is by multiplying Vq).

The power supply device of the electrodeless discharge lamp of the present invention is configured to have a constant voltage by the pulse width modulation signal PWM by the phase control voltage stabilizing unit configured as described above, so that the boost voltage VB is stable. It can be controlled so as to control the phase, and at the same time, the phase control between the rectified voltage Vd and the rectified current IBr can be precisely performed, and the phase control voltage stabilization part including the first switch Q1 can be all digitalized. As a result, integrated circuits (ICs) can be integrated into a single chip, thereby miniaturizing and reducing the cost.

The phase control voltage stabilization unit VRphase integrates the divided voltage rectification voltage Vpha to allow the charge relaxation time τc of the divided voltage rectification voltage Vpha to be smaller than the discharge relaxation time τd of the divided voltage rectified voltage Vpha. 10 may be further configured.

By the integrator 10 as described above, the boost voltage VB is rapidly increased when the electrodeless discharge lamp is started or when the electrodeless discharge lamp is discharged, so that the electrodeless lamp can be stably and quickly turned on. In addition, it is possible to prevent the brightness of the blinking lamp from being changed due to the discharge change of the electrodeless discharge lamp.

Operation of the power supply device of the electrodeless discharge lamp of the present invention according to the above configuration is as follows.

Operation of the power supply device of the electrodeless discharge lamp of Figure 1 is as follows.

The full-wave rectifier DB including the diode bridge is full-wave rectified by the AC power source CMP, which is a commercial power source, to output the rectified voltage Vd, and the rectified voltage Vd is supplied to the boosting unit A. The rectified voltage Vd is interrupted by a first switch Q1 composed of N-channel MOS transistors that are turned on or off in accordance with the logic value of the pulse width modulation signal PWM, and the intermittent ground current when the first switch Q1 is turned on. (Is) to ground. Due to the electromagnetic induction action by the intermittent ground current Is, an electromotive voltage Vi is generated in the boosting coil XL, and the electromotive voltage Vi superimposed on the rectified voltage Vd is rectified to the rectifying diode Dr. Is smoothed by the smoothing capacitor Cs, and the boosting unit A outputs the boosted voltage VB.

The boosted voltage VB is input to the high frequency switching unit B. The second switch Q2 composed of the N-channel morph transistors is turned on or off according to the first switch control signal GS _RF of a square wave having a pulse duty of 50% at a frequency of about 2.5 MHz. third switch (Q3) is turned on or off in response to a first switch control signal (GS _RF) the second switch control signal (Inv-GS _RF) with the polarity of the polarity opposite to that of. Therefore, the second switch Q2 and the third switch Q3 are alternately turned on or off and chopped the boost voltage VB inputted to the high frequency switching unit B, and the high frequency intermittent currents are high frequency switching currents flowing in opposite directions. (Is1, Is2) occurs.

The high frequency intermittent currents Is1 and Is2 are waveform shaped by a waveform shaping coil Lw from a square wave to a sine wave, and an excitation coil of an electrodeless discharge lamp formed of a resonant circuit of an induction coefficient Lo and a capacitor Co. LD _Coil is driven to excite the electrodeless discharge lamp to control lighting and discharge to emit the electrodeless discharge lamp normally. The high frequency switching unit B is called a high frequency inverter because it is turned on or off by a high frequency signal.

When the electrodeless discharge lamp is turned on, the internal impedance is greatly changed due to the change of the discharge state, and the boosted voltage VB is changed according to the change of the internal impedance, which causes the brightness of the electrodeless discharge lamp to be changed. Therefore, the boosted voltage VB should be controlled to maintain a constant voltage so that the brightness of the electrodeless discharge lamp does not vary. When the boosted voltage VB is kept constant and the electrodeless discharge lamp is driven at the rated voltage, the lifetime of the electrodeless discharge lamp is improved.

In addition, when the phase of the rectified current IBr flowing through the boosting coil XL approaches the phase of the rectified voltage Vd, the power factor is close to 1, thereby increasing the effective power of the boosted voltage VB supplied to the electrodeless discharge lamp. You can do In other words, power efficiency can be optimized. In order to solve this problem, the boosting unit A includes a phase control voltage stabilization unit VRphase. The phase control voltage stabilization part VRphase includes a divided voltage boosted voltage Vf divided by a boosted voltage VB, a divided voltage rectified voltage Vpha divided by a rectified voltage Vd, and a rectified current flowing through a boosted coil XL. Intermittent current monitor voltage (Isen) that monitors the intermittent ground current (Is) flowing intermittently through the first switch (Q1) that is turned on or off according to the rectified current monitor voltage (Idet) and the pulse width modulated signal (PWM). ) To receive the voltage stabilization control of the boosted voltage (VB) and phase control of the current / voltage.

2 is a configuration diagram of the phase control voltage stabilization unit, and FIG. 3 is a signal waveform diagram of the phase control voltage stabilization unit. Referring to FIGS. 2 and 3, voltage stabilization control for the boost voltage VB and phase control of the current / voltage are performed. The operation description is as follows.

The divided voltage rectifying voltage Vpha obtained by dividing the rectified voltage Vd into the resistors R1 and R2 connected in series is input to a phase control voltage stabilizer VRVR, thereby integrating the relaxation time of charge and discharge for the first time. The integrated waveform is converted into an integrated waveform that changes more quickly and smoothly than the discharge or falling waveform. That is, since the divided voltage rectified voltage Vpha is quickly charged to the capacitor C12 through the diode D11 at the time of charging by the integrator 10, the charge relaxation time τc becomes small and at the time of discharge, the capacitor C12 is discharged. Since the voltage charged at is slowly discharged through the resistor R11, the discharge relaxation time tau d becomes considerably longer than the charge relaxation time tau c. As described above, by integrating the charge and discharge relaxation times by the integrator 10, the voltage boosted voltage VB can be increased rapidly at the start of lighting of the electrodeless discharge lamp, and thus the threshold voltage causing the discharge start reaction of the electrodeless discharge lamp. Momentarily, the lighting of the electrodeless discharge lamp becomes unstable, and the brightness fluctuates, preventing the flashing of light or the inrush current generated at the start of discharge. It can prevent.

In addition, if the capacity of the capacitor C12 is selected to have a value 50 to 150 times larger than the capacity of the capacitor C11, preferably about 100 times, the optimum charge / discharge relaxation time can be obtained.

The subtractor 11 configured using the OP amplifier divides the boosted voltage Vf obtained by dividing the boosted voltage VB by two resistors R3 and R4 connected in series and the divided voltage integrated by the integrator 10. The rectified voltage Vpha is received to output a differential voltage Vm obtained by subtracting the divided voltage rectified voltage Vpha from the divided voltage boosted voltage Vf.

The first comparator 12 is the first switch by a resistor Rs connected between the first switch Q1 and the source terminal of the first switch Q1 and ground, which are turned on or off according to the pulse width modulation signal PWM. When Q1 is turned on, the intermittent current monitor voltage Isen and the differential voltage Vm, which are voltages generated in the resistor Rs by the intermittent ground current Is flowing in the resistor Rs, are compared to the voltage control pulse signal ( Outputs Vp). That is, the first comparator 12 outputs an activated voltage control pulse signal Vp having a high logic value when the differential voltage Vm is greater than the intermittent current monitor voltage Isen, and the differential voltage Vm is an intermittent current. If it is equal to or less than the monitor voltage Isen, an inactive voltage control pulse signal Vp having a low logic value is output. The intermittent current monitor voltage Isen is obtained by integrating the intermittent ground current Is by the primary induction coefficient Lp and the resistor Rs of the boosting coil XL and thus has a triangular wave signal waveform.

The second comparator 13 monitors the rectified current IBr that rectifies the boosted current flowing through the boosting coil XL with the secondary coil Ls of the boosting coil XL, and monitors the rectified current monitor voltage Idet. The envelope voltage (Idet-En), which is integrated by the coil (Ls) and the input resistance (Ri), and the magnitude of the voltage greatly changes, and the reference voltage (Vref) defined by the user is received to receive the envelope voltage (Idet-En) and The phase control pulse signal Vq is output by comparing the reference voltage Vref. That is, the second comparator 13 outputs an activated phase control pulse signal Vq having a high logic value when the reference voltage Vref is greater than the envelope voltage Idet-En, and vice versa. Outputs the deactivated phase control pulse signal Vq.

The AND product 14 formed of an AND gate receives the voltage control pulse signal Vp and the phase control pulse signal Vq and logically multiplies these signals to turn on or off the first switch Q1. Output the modulation signal PWM.

As described above, the phase control voltage stabilization unit VRphase maintains the boost voltage VB at a constant voltage value by the pulse width modulation signal PWM, and at the same time, the phase difference between the rectified current IBr and the rectified voltage Vd. To get closer to zero. The phase control voltage stabilizer (VRphase) of FIG. 2 is composed of a circuit that does not use a clock signal, but a phase control voltage stabilizer having the same function may be implemented using a clock signal, and a pulse width modulation is performed. A phase control voltage stabilization unit having the same function can be implemented by using a microcomputer such as an appropriate custom IC or a central processor unit for control.

Therefore, the power supply device of the electrodeless discharge lamp of the present invention is characterized by the internal impedance of the electrodeless discharge lamp, i.e., even if the voltage of the alternating current power source (CMP), which is a commercial power source, is changed by various factors or by the discharge phenomenon of the electrodeless discharge lamp. Even when the equivalent impedances of the excitation coil (LD _Coil ), Lo, Co, and parallel resistance change, a boosted voltage (VB) with a stable value is always generated to generate a high frequency interrupted current (Is1 / Is2), which is a stable high frequency drive power supply suitable for the rated power. ) Can be obtained.

In addition, the power supply device of the electrodeless discharge lamp of the present invention can achieve high brightness illumination with stable brightness, and match the phase of the rectified voltage Vd and the rectified current IBr in the boosted voltage VB to match the power factor thereof. By controlling the effective power of the high frequency drive power supply to be close to 1, the high brightness and energy saving lighting device can be realized.

In addition, in the power supply device of the electrodeless discharge lamp of the present invention, since the phase of the rectified voltage Vd and the rectified current IBr in the boosted voltage VB coincides with the power factor of 1, harmonics are applied to the rectified current IBr. It can prevent generation, and can greatly reduce generation of high frequency electromagnetic induction noise.

The power supply device of the electrodeless discharge lamp of the present invention generates a boosted voltage having a stable value at all times even when the voltage of the AC power source is changed by various factors or the internal impedance of the electrodeless discharge lamp is stable, so that it is suitable for rated power. It is possible to obtain high frequency interruption current as a power source, achieve high brightness illumination with stable brightness, and match the phase of rectified voltage and rectified current so that its power factor is close to 1 to maximize the effective power of the high frequency driving power supply. By controlling, it has high brightness, saves energy, and prevents harmonics from being generated in the rectified current, thereby greatly reducing generation of high frequency electromagnetic induction noise.

Claims (6)

In the power supply device of the electrodeless discharge lamp to supply a high frequency current to the excitation coil to excite the electrodeless discharge lamp by the electromagnetic induction action of the excitation coil, Boosting means for interrupting the rectified voltage rectified by the AC power to generate an intermittent ground current to the ground to output the boosted voltage by an electromagnetic induction action by the boosting coil; And The divided voltage boosted voltage obtained by dividing the boosted voltage and the divided voltage rectified voltage divided by the rectified voltage, the rectified current monitor voltage and the reference voltage which monitor the rectified current flowing through the boosted coil, are received by the divided voltage boosted voltage and the divided voltage rectified voltage. The stepped voltage is controlled by varying the pulse width of the interrupted ground current so that the boosted voltage has a constant voltage value, and the pulse width of the interrupted ground current is varied by the rectified current monitor voltage and the reference voltage. And a phase control voltage stabilizing means for controlling a phase of the rectified current flowing through the boosting coil to reduce a phase difference between the rectified voltage and the rectified current. The method of claim 1, wherein the phase control voltage stabilization means Receives the divided voltage boosted voltage obtained by dividing the boosted voltage according to the magnitude of the resistance value and the divided voltage rectified voltage obtained by dividing the rectified voltage according to the magnitude of the resistance value, and subtracts the divided voltage rectified voltage from the divided voltage boosted voltage to output a differential voltage. Subtraction means; Receiving an intermittent current monitor voltage and the differential voltage that monitor the intermittent ground current, comparing the differential voltage with the intermittent current monitor voltage, and outputting a voltage control pulse signal that is activated when the differential voltage is greater than the intermittent current monitor voltage; 1 comparing means; Receives a rectified current monitor voltage and a reference voltage that monitor the rectified current flowing through the boosting coil, compares the reference voltage and the rectified current monitor voltage, and outputs a phase control pulse signal that is activated when the reference voltage is greater than the rectified current monitor voltage. Second comparison means for performing; And And a logical multiplication means for receiving the voltage control pulse signal and the phase control pulse signal and performing a logical multiplication on the received voltage control pulse signal and the phase control pulse signal to output a pulse width modulated signal for interrupting the intermittent ground current. Power supply device for an electrodeless discharge lamp. 3. The method of claim 2, wherein the phase control voltage stabilizing means further comprises an integrating means for integrating the divided rectified voltage so that the charge relaxation time of the divided rectified voltage is smaller than the discharge relaxation time of the divided rectified voltage. Power supply device for an electrodeless discharge lamp characterized in that. In the power supply device of the electrodeless discharge lamp to supply a high frequency current to the excitation coil to excite the electrodeless discharge lamp by the electromagnetic induction action of the excitation coil, Full-wave rectifying means for receiving AC power and full-wave rectifying the AC power to output a rectified voltage; First switching means for interrupting the intermittent ground current flowing from the rectified voltage to the ground by turning the rectified voltage to ground in response to a pulse width modulation signal; Step-up coil, one end of which is connected to the rectified voltage, the other end of which is connected to the first switch means to generate an electromotive voltage by electromagnetic induction according to the interruption of the intermittent ground current by turning on or off the first switch means. ; A rectifying diode for voltage rectifying the electromotive voltage; A capacitor for outputting a boosted voltage by smoothing the output voltage of the rectifier diode; And a pulse duty that is variable in response to a voltage difference between the divided voltage boosted voltage obtained by dividing the boosted voltage and the interrupted current monitor voltage monitoring the interrupted ground current, and a phase difference between the rectified voltage and the rectified current flowing through the boosted coil. A phase control voltage stabilizing means for outputting a pulse width modulation signal to maintain the boosted voltage to have a constant voltage value and bringing the phase of the rectified current closer to the phase of the rectified voltage; And Receiving a first switch control signal having a predetermined frequency and a second switch control signal whose polarity is inverted from the first switch control signal, the second and third switch means connected in series with the boosted voltage are connected to the first, And a high frequency inverter which conducts and blocks alternately every half cycle according to the second switch control signals to generate a high frequency interrupted current and allows the high frequency interrupted current to flow through the excitation coil. . The method of claim 4, wherein the phase control voltage stabilization means Receives the divided voltage boosted voltage obtained by dividing the boosted voltage according to the magnitude of the resistance value and the divided voltage rectified voltage obtained by dividing the rectified voltage according to the magnitude of the resistance value, and subtracts the divided voltage rectified voltage from the divided voltage boosted voltage to output a differential voltage. Subtraction means; Receiving an intermittent current monitor voltage and the differential voltage that monitor the intermittent ground current, comparing the differential voltage with the intermittent current monitor voltage, and outputting a voltage control pulse signal that is activated when the differential voltage is greater than the intermittent current monitor voltage; 1 comparing means; Receives a rectified current monitor voltage and a reference voltage that monitor the rectified current flowing through the boosting coil, compares the reference voltage and the rectified current monitor voltage, and outputs a phase control pulse signal that is activated when the reference voltage is greater than the rectified current monitor voltage. Second comparison means for performing; And And a logical multiplication means for receiving the voltage control pulse signal and the phase control pulse signal and performing a logical multiplication on the received voltage control pulse signal and the phase control pulse signal to output a pulse width modulated signal for interrupting the intermittent ground current. Power supply device for an electrodeless discharge lamp. 6. The apparatus of claim 5, wherein the phase control voltage stabilizing means further comprises an integrating means for integrating the divided rectified voltage so that the charge relaxation time of the divided rectified voltage is smaller than the discharge relaxation time of the divided rectified voltage. Power supply device for an electrodeless discharge lamp characterized in that.

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