KR100500884B1 - Electronic ballast for HID lamp and method for generating signal thereof - Google Patents

Abstract

The present invention relates to an electronic ballast for an HID lamp and a signal generating method thereof, comprising: a rectifier for full-wave rectifying and outputting an alternating current voltage; An SMPS integrated circuit configured to input an output voltage of the rectifier and output a stable power supply voltage; A multiple signal oscillator for inputting an output voltage of the rectifier and generating a multiple oscillation signal; An inverter unit configured to input an output voltage of the SMPS integrated circuit and the multiple oscillation signal and generate a multiple square wave signal; A resonator unit resonating the multiple square wave signals output from the inverter unit to provide the HID lamp; A resonance detector coupled to the resonator and configured to generate a predetermined voltage when the resonator is resonated and provide the predetermined voltage to the SMPS integrated circuit and the inverter; And an initial operating voltage providing unit for inputting the output voltage of the rectifying unit and providing the initial operating voltage to the SMPS integrated circuit and the inverter unit when the inverter unit is not operating, thereby significantly reducing the light flicker of the HID lamp.

Description

Electronic ballast for HID lamp and signal generation method

The present invention relates to an electronic ballast for HID (High Intensity Discharge, HID) lamp, and more particularly, to generate a multiple signal to remove the shaking of light emitted from the HID lamp electronic A ballast and a signal generating method thereof.

The HID lamp refers to a high brightness discharge lamp having a tube load of 2 [W / cm 2] or more in terms of tube load using light emission by discharge in a high pressure gas or steam. HID lamps include metalhalite lamps, high pressure sodium lamps and high pressure mercury lamps.

The high-pressure mercury lamp was first developed in the 1930s and has been developed around the industrial lighting market because of its high efficiency and long lifespan. Recently, the development of metal halite lamps with low mercury content and high efficiency has been accelerated.

Ballasts for HID lamps were developed in 1957 for high pressure mercury lamps and in 1967 magnetic and electronic for metal halide lamps and high pressure sodium lamps. In the 1980s, a lighting control system using a microprocessor was developed in relation to a ballast for fluorescent lamps, which started electronics of ballasts for HID lamps. However, ballasts for HID lamps will be used magnetically over the next few years, and development is expected to continue electronically only in small capacity applications.

1 is a block diagram of a conventional electronic ballast for a HID lamp. Referring to FIG. 1, the conventional electronic ballast 101 for a HID lamp includes a rectifier 111, an oscillator 121, an inverter 131, and a resonator 141. The electronic ballast 101 shown in FIG. 1 will be described with reference to the waveforms shown in FIG. 2.

The rectifier 111 rectifies the input AC voltage Vin and transmits the rectified AC voltage Vin to the oscillator 121.

The oscillator 121 receives the output signal of the rectifier 111 and generates a single oscillation signal V1.

The inverter unit 131 receives the oscillation signal V1 output from the oscillator 121 and generates a single square wave signal V2.

The resonator 141 receives the signal V2 output from the inverter 131 and generates a single sinusoidal wave signal Vout to operate the HID lamp to cause the HID lamp to emit light.

As described above, the conventional electronic ballast 101 for the HID lamp outputs a single sinusoidal signal to operate the HID lamp, so that the light generated by the HID lamp is often shaken. This shortens the life of the HID lamp.

The technical problem to be achieved by the present invention is to provide an electronic ballast for the HID lamp to reduce the light shaking phenomenon of the HID lamp.

Another object of the present invention is to provide a signal generation method suitable for the electronic ballast.

The present invention to achieve the above technical problem

An electronic ballast for emitting a HID lamp, the electronic ballast comprising: a rectifier for full-wave rectifying and outputting an alternating current voltage; An SMPS integrated circuit configured to input an output voltage of the rectifier and output a stable power supply voltage; A multiple signal oscillator for inputting an output voltage of the rectifier and generating a multiple oscillation signal; An inverter unit configured to input an output voltage of the SMPS integrated circuit and the multiple oscillation signal and generate a multiple square wave signal; A resonator unit resonating the multiple square wave signals output from the inverter unit to provide the HID lamp; A resonance detector coupled to the resonator and configured to generate a predetermined voltage when the resonator is resonated and provide the predetermined voltage to the SMPS integrated circuit and the inverter; And an initial operating voltage providing unit for inputting the output voltage of the rectifying unit and providing the initial operating voltage to the SMPS integrated circuit and the inverter unit when the inverter unit is not operating.

Preferably, the multi-signal oscillator comprises: a voltage drop unit for outputting the rectified unit by dropping the output voltage to a low voltage; A constant voltage unit for maintaining a constant voltage level when the voltage output from the voltage drop unit is higher than a predetermined level; A switching unit operating in response to an output voltage of the constant voltage unit; And a bridge circuit connected to the switching unit and outputting the multiple oscillation signal.

The present invention to achieve the above technical problem

CLAIMS 1. A signal generation method for reducing light flicker of a HID lamp, comprising: (a) full-wave rectifying an alternating voltage; (b) dropping a voltage of the full-wave rectified signal by a predetermined level; (c) generating a multiple oscillation signal by oscillating the predetermined level dropped signal; (d) resonating the multiple oscillation signal to generate a multiple sinusoidal signal; And (e) applying the multi-sine wave signal to the HID lamp.

According to the present invention, the light flicker of the HID lamp is significantly reduced.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference numerals in the drawings denote like elements.

3 is a block diagram of an electronic ballast for an HID lamp according to the present invention. Referring to FIG. 3, the electronic ballast 301 for the HID lamp includes a rectifier 311, an SMPS integrated circuit 321, a multi-signal oscillator 331, an initial operating voltage provider 341, an inverter 351, and a resonance. A unit 361 and a resonance detector 371 are provided.

The rectifier 311 performs full-wave rectification and outputs the AC voltage Vin input thereto.

The SMPS integrated circuit 321 inputs the output voltage Vrec of the rectifier 311 and supplies the stable power supply voltage V3 to the inverter unit 351.

The initial operating voltage providing unit 341 inputs the output voltage of the rectifying unit 311 and provides the initial operating voltage V1 to the SMPS integrated circuit 321 and the inverter unit 351 when they are not operated.

The multiple signal oscillator 331 inputs the output voltage Vrec of the rectifier 311 and generates a triangular waveform multiple oscillation signal Vosc.

The inverter unit 351 inputs an output voltage V3 of the SMPS integrated circuit 321 and a triangular waveform multiple oscillation signal Vosc output from the multiple signal oscillator 331, and generates a multi-square wave signal Vinv. .

The resonator 361 resonates the multiple square wave signals output from the inverter unit 351 to generate the multiple sinusoidal wave signals Vout and provide them to the HID lamp. The HID lamp generates light by the multiple sinusoidal wave signals Vout output from the resonator 361.

The resonance detector 371 is coupled to the resonance unit 361, and generates a predetermined voltage V2 when the resonance unit 361 resonates, and provides the predetermined voltage V2 to the SMPS integrated circuit 321 and the inverter unit 351. The resonance detector 371 does not output the predetermined voltage V2 when the resonance unit 361 does not resonate.

The SMPS integrated circuit 321 and the inverter unit 351 do not operate unless a predetermined voltage V2 is output from the resonance detector 371, and thus the HID lamp does not operate. Then, the operation starts when the initial operation voltage V1 is output from the initial operation voltage providing unit 341, whereby the HID lamp also starts emitting light.

As described above, the resonance state of the resonance unit 361 can be known depending on whether the predetermined voltage V2 is output from the resonance detection unit 371. In addition, when the HID lamp operates in a state where the resonator 361 does not resonate, the operation of the HID lamp becomes unstable and the life of the HID lamp is shortened. The problem is solved by providing the resonance detector 371. There is a number.

As described above, the multi-signal oscillator 331 generates the multi-oscillation signal Vosc and provides the resonator 361 to reduce the trembling of light when the HID lamp emits light.

FIG. 4 is a circuit diagram of the multi-signal oscillator 331, the initial operating voltage providing unit 341, the inverter unit 351, the resonator 361, and the resonance detector 371 illustrated in FIG. 3.

Referring to FIG. 4, the multi-signal oscillator 331 includes a voltage drop unit 411, a constant voltage unit 421, a switching unit 431, and a bridge circuit 441.

The voltage drop unit 411 drops and outputs the output voltage Vin of the rectifier 311 to a low voltage. The voltage drop unit 411 has one end connected to the output terminal of the rectifier 311 and outputs an output voltage of the voltage drop unit 411 from the other end, and between the first resistor R1 and the ground terminal. It has a second resistor (R2) connected to.

The constant voltage unit 421 maintains a constant voltage level when the voltage output from the voltage drop unit 411 becomes higher than a predetermined level. The constant voltage unit 421 includes a zener diode connected between the voltage drop unit 411 and the ground terminal.

The switching unit 431 operates in response to the output voltage of the constant voltage unit 421. That is, the switching unit 431 turns on when the voltage above the predetermined level is output from the constant voltage unit 421 to operate the bridge circuit 441, and turns off when the voltage below the predetermined level is output from the constant voltage unit 421. (off) to prevent the bridge circuit 441 from operating.

The switching unit 431 may include a photo coupler, a bipolar transistor, a MOS field effect transistor, or the like.

The bridge circuit 441 is a circuit in which four diodes D1 to D4 are connected in a bridge form.

Referring to FIG. 4, the initial operating voltage providing unit 341 includes a resistor R3 connected to the output terminal of the rectifying unit 311 of FIG. 3 and a capacitor C1 connected between the resistor R3 and the ground terminal. The initial operating voltage providing unit 341 provides the voltage accumulated in the capacitor C1 as initial operating voltages of the SMPS integrated circuit 321 of FIG. 3 and the inverter unit 351.

Referring to FIG. 4, the inverter unit 351 includes an integrated circuit device 451, resistors R4 to R7, a capacitor C2, and MOS field effect transistors 461 and 462. The inverter unit 351 inputs a triangular waveform multiple oscillation signal Vosc and generates a multi-square wave signal Vinv. The MOS field effect transistor 461 receives a power supply voltage V3 from an SMPS integrated circuit 321 of FIG. 3. As the integrated circuit 451, an inverter integrated circuit device such as IR2153 may be used.

Referring to FIG. 4, the resonator 361 includes a capacitor C3 and an inductor L1. The resonator 361 resonates an input multiple square wave signal Vinv to generate a multiple sinusoidal signal and supply the multi-sine wave signal to the HID lamp.

Referring to FIG. 4, the resonance detector 371 includes an auxiliary inductor L2, a resistor R9, and a diode D5 coupled to the inductor L1. When the resonator 361 resonates, a predetermined voltage V2 is induced to the auxiliary inductor L2 and output through the resistor R9 and the diode D5. If the resonator 361 does not resonate, the auxiliary inductor ( Since no voltage is induced to L2, the resonance detector 371 does not output the voltage V2.

5 is a waveform diagram of signals shown in FIG. 4. An operation of the circuit shown in FIGS. 3 and 4 will be described with reference to FIG. 5.

The output voltage Vrec of the rectifier 311 is charged in the capacitor C1 of the initial operation voltage providing unit 341, and the voltage charged in the capacitor C1 is integrated circuit 451 and SMPS of the inverter unit 351. It is applied to the integrated circuit 321 of FIG. 3 to operate the inverter unit 351 and the SMPS integrated circuit 321 of FIG. 3.

The output voltage Vrec of the rectifier 311 is also applied to the multi-signal oscillator 331. The resistors R1 and R2 distribute the output voltage Vrec of the rectifier 311, and a voltage lower than the output voltage Vrec of the rectifier 311 is generated at the node N1. When the voltage of the node N1 reaches a predetermined level, for example, 0.7 volts or more, the switching unit 431 is turned on and current flows in the bridge circuit 441. Accordingly, the resistor R5 and the capacitor C2 start oscillation, and the multi-signal oscillator 331 generates the triangular waveform multiple oscillation signal Vosc.

The multiple oscillation signal Vosc is applied to the integrated circuit 451, and the multiple square wave signals Va and Vb are output from the output terminals of the integrated circuit 451 and applied to the MOS field effect transistors 461 and 462.

The MOS field effect transistor 461 receives a power supply voltage V3 from the SMPS integrated circuit 321 and outputs the multiple oscillation signals Va output from the integrated circuit 451 by the operation of the MOS field effect transistors 461 and 462. And Vb) are combined with each other and output.

The multiple oscillation signal Vosc of the square wave output from the inverter unit 351 is resonated by the resonator 361, and the resonator 361 generates the multi-sinusoidal signal Vout and applies the HID lamp to the HID lamp. Done.

At this time, if the resonator 361 does not resonate, the resonance detector 371 does not output the voltage V2. Accordingly, the SMPS integrated circuit 321 and the integrated circuit 451 of the inverter unit 351 operate. Stop. Therefore, the resonance state of the resonance part 361 can be known. When the integrated circuit 451 of the SMPS integrated circuit 321 and the inverter unit 351 stops operating, the initial operating voltage providing unit 341 provides a voltage V1 to supply the SMPS integrated circuit 321 and the inverter unit ( Integrated circuit 451 of 351 resumes operation.

The best embodiments have been disclosed in the drawings and the specification. The terminology used herein is for the purpose of describing the invention and is not intended to limit the meaning of the invention or to limit the scope of the invention described in the claims. As those skilled in the art will appreciate that various modifications and equivalent other embodiments may be made therefrom, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

As described above, the multi-signal oscillator 331 receives the output voltage Vrec of the rectifier 311 and generates the multi-oscillation signal Vosc, thereby applying the sinusoidal multiple oscillation signal to the HID lamp. Light blurring from HID lamps is significantly reduced. Thus, the lifetime of the HID lamp is much longer than when using a conventional electronic ballast.

In addition, when the resonance unit 361 does not resonate with the resonance detector 371, the inverter unit 351 and the SMPS integrated circuit 321 do not output a signal to stop the operation of the HID lamp. By operating the HID lamp only when 361) resonates, it has the effect of further extending the life of the HID lamp.

BRIEF DESCRIPTION OF THE DRAWINGS In order to better understand the drawings cited in the detailed description of the invention, a brief description of each drawing is provided.

1 is a block diagram of a conventional electronic ballast for a HID lamp.

2 is a waveform diagram of signals shown in FIG. 1.

3 is a block diagram of an electronic ballast for an HID lamp according to the present invention.

FIG. 4 is a circuit diagram of the multiple signal oscillator, the inverter unit, the resonance unit, the resonance detector, and the initial operation voltage providing unit shown in FIG. 3.

5 is a waveform diagram of signals shown in FIG. 4.

Claims (12)

In an electronic ballast which emits a HID lamp, A rectifier for full-wave rectifying and outputting an input AC voltage; An SMPS integrated circuit configured to input an output voltage of the rectifier and output a stable power supply voltage; A multiple signal oscillator for inputting an output voltage of the rectifier and generating a multiple oscillation signal; An inverter unit for inputting an output voltage of the SMPS integrated circuit and the multiple oscillation signal and generating a multiple signal different from the multiple oscillation signal; A resonator unit resonating the multiple signals output from the inverter unit to provide the HID lamp; A resonance detector coupled to the resonator and configured to generate a predetermined voltage when the resonator is resonated and provide the predetermined voltage to the SMPS integrated circuit and the inverter; And And an initial operating voltage providing unit for inputting an output voltage of the rectifying unit and providing an initial operating voltage to the SMPS integrated circuit and the inverter unit when the inverter unit is not operated. The electronic ballast of claim 1, wherein the multiple oscillation signal output from the multiple signal generator is a triangular waveform, and the multiple signal output from the inverter unit is a square wave. The method of claim 1, wherein the multi-signal oscillator A voltage drop unit configured to drop the output voltage of the rectifier unit to a low voltage to output the rectified unit; A constant voltage unit for maintaining a constant voltage level when the voltage output from the voltage drop unit is higher than a predetermined level; A switching unit operating in response to an output voltage of the constant voltage unit; And And a bridge circuit connected to the switching unit and outputting the multiple oscillation signal. The method of claim 3, wherein the voltage drop unit A first resistor having one end connected to an output terminal of the rectifying unit and outputting an output voltage of the voltage drop unit from the other end; And And a second resistor connected between the first resistor and a ground terminal. The method of claim 3, wherein the constant voltage unit And a Zener diode connected between the voltage drop section and the ground terminal. The method of claim 3, wherein the switching unit Electronic ballast for HID lamps characterized by being a photo coupler. The method of claim 3, wherein the switching unit An electronic ballast for a HID lamp, characterized in that the bipolar transistor for performing a switching operation in response to the output signal of the constant voltage unit. The method of claim 3, wherein the switching unit And a MOS field effect transistor that performs a switching operation in response to the output signal of the constant voltage unit. The method of claim 1, wherein the resonance detection unit And an auxiliary inductor, and outputs the predetermined voltage when the resonator is resonant, and does not output the predetermined voltage when the resonator is not resonant. The method of claim 1, wherein the initial operating voltage providing unit A resistor connected to the output terminal of the rectifier; And A capacitor connected between the resistor and the ground terminal, And the voltage stored in the capacitor is output as an initial operating voltage of the SMPS integrated circuit and the inverter unit. The method of claim 1, wherein the SMPS integrated circuit and the inverter unit does not operate unless the predetermined voltage is output from the resonance detector, and starts to operate when the initial operating voltage is output from the initial operating voltage providing unit. Electronic ballast for HID lamp (a) full-wave rectifying an alternating voltage; (b) dropping a voltage of the full-wave rectified signal by a predetermined level; (c) generating a multiple oscillation signal by oscillating the predetermined level dropped signal; (d) resonating the multiple oscillation signal to generate a multiple sinusoidal signal; And and (e) applying the multiple sine wave signal to the HID lamp.