KR100292994B1 - Automatic flickering device for electronic stabilizer for high voltage discharge lamp - Google Patents

Abstract

PURPOSE: An automatic flickering device is provided to achieve a simplified structure, installation convenience and economic advantage by installing the automatic flickering device within the stabilizer. CONSTITUTION: An automatic flickering device comprises a power supply unit(1) for rectifying and outputting a power applied from an external source; a power factor improving and voltage regulating unit(2) for converting the power input from the power supply unit into a direct current constant voltage and outputting the result; an inverter unit(3) for converting the constant voltage into an alternating current of high frequency, and turning on a discharge lamp(4); a high voltage generating unit(7) for generating a high voltage for turning on the discharge lamp; a high voltage cut-off unit(8) for stopping operation of the high voltage generating unit upon occurrence of breakdown of discharge lamp or interior of stabilizer; and a day/night automatic flickering unit(5) for controlling day/night automatic flickering of the discharge lamp by controlling power being supplied to the power factor improving and voltage regulating unit, an inverter driving unit(6), high voltage generating unit and high voltage cut-off unit.

Description

Day and night automatic flashing device of electronic ballast for high pressure discharge lamp

1 is a block diagram of a magnetic ballast for a conventional automatic flashing.

2 is a block diagram of the present invention.

3 is a detailed circuit diagram of FIG.

<Description of the reference numerals for the main parts of the drawings>

1: power supply unit 2: power factor improvement and constant voltage unit

3: inverter section 4: discharge lamp

5: Day and night automatic flashing unit 6: Inverter drive unit

7: high pressure generating unit 8: high pressure breaking unit

D: Diode R: Resistance

C: Capacitor Q: MOSFET

ZD: Zener Diode T: Trans

U: IC Cds: Light Sensor

VR: Varistor

High-pressure discharge lamps are mainly used for outdoor lighting. For example, it is mainly used for street lighting at night, lighting for rooftop advertising towers, building lighting, and lighting for landscaping in a park. However, the high-pressure discharge lamp for this purpose flashes automatically day and night. The present invention relates to a day and night automatic flashing device of an electronic ballast for a high-pressure discharge lamp and to a built-in ballast, and to the operation of the protection circuit and the RESET circuit therein at no load.

The existing day / night auto flasher for high-pressure discharge lamp is attached to the outside of magnetic ballast to perform day / night auto flasher as shown in Fig. 1. This is because the ballast itself is magnetic, there are technical difficulties in installing the electronic day and night flasher in the ballast and it was not considered as a manufacturing cost problem. However, when the ballast is electronicized, it is very easy to add day and night flashers inside the ballast. As shown in Figure 3, peripheral circuits such as rectifiers and small transformers are already configured, so if you add a few circuits, day and night auto flashing can be performed well. In addition, the disadvantage of the conventional method is that the day and night auto flasher is installed outside the ballast, which requires twice the labor cost, complicated wiring, and the day and night auto flasher cost more than the ballast. It is also disadvantageous.

Accordingly, an object of the present invention is to install the day and night automatic flashing device which is performed by attaching the existing day and night automatic flashing device to the outside of the ballast, thereby simplifying the structure, convenience of installation, and simple wiring. It is in pursuit of advantage.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Day and night automatic flashing device of the electronic ballast is performed in the day and night automatic flashing unit (5) as shown in Figure 2, this day and night automatic flashing unit using the optical sensor (Cds), power factor improvement and constant voltage unit (2) ) And inverter drive unit 6, high pressure generating unit 7 and cut-off unit 8 are controlled to perform auto flashing day and night. As a control method, a power factor improvement and a method of turning on and off the power circuits of the constant voltage unit 2, the inverter driver 6, the high voltage generator 7 and the breaker 8 are used. That is, as shown in Fig. 3, the optical sensor Cds changes its resistance according to the light intensity, and detects the potential difference between the variable potentials of the optical amplifiers with respect to the reference potentials of the operation amplifiers OP1 and OP2 and outputs the output signal. Is received by TR1 and TR2 to control NO OFF.

During the day, the OP AMPs OP1 and OP2 are operated by the optical sensor Cds, and TR1 and TR2 are turned ON.When TR1 is turned ON, the potential of terminal 5, which supplies power to the power factor improvement and the constant voltage unit 2, becomes zero voltage. . Therefore, DC constant voltage is not secured because U1 cannot operate. In addition, the power supply of the inverter drive unit 6 for driving the inverter unit 3 is also supplied by the first terminal, and this potential becomes zero voltage, and the generation of alternating current is also prevented. Finally, the potential of the second terminal of the high voltage breaker 8 also becomes zero voltage, and the generation of high voltage also stops, and the operation of the ballast is stopped.

At night, TR1 and TR2 are turned off by the light sensor, and the discharge lamp is turned on. When TR1 is OFF, the heat rate improvement and the constant voltage unit 2 operate. That is, when power is supplied by the 5th terminal of U1, U1 starts oscillation, and by this Q1 switches and a constant voltage is generated. In addition, power is supplied to No. 1, which is the power terminal of the inverter driver 6, and pulses are generated to switch Q2 and Q3 to generate high-frequency alternating current. At the same time, power is applied to the second terminal of the high voltage breaking unit 8 so that a high pressure is generated. This causes the discharge lamp to light up.

By the way, even when the discharge lamp is broken or broken and no load is applied, if the high pressure is continuously generated in the high pressure generating unit without any restriction, the high pressure destroys other components. Therefore, the generated high voltage should be cut off when it is applied for a short time for lighting or no load. This circuit is operated by SCR1 and SCR2, which also causes the power factor improvement and constant voltage unit 2, inverter drive unit 6, and high voltage generator 7 and shut-off unit 8 to be cut off and the ballast stops operating. . The ballast, which has stopped working, stops working if it keeps supplying power. In order to recover this, RESET circuit is required, and TR1 and TR2 perform this role. TR1, TR2 turns ON and OFF once by day or night by external light or SCR1 and SCR2 hold current becomes zero and SCR1 and SCR2 are turned OFF, so the ballast is reset and started again.

Therefore, the day and night automatic flashing device of the electronic ballast for high discharge lamp has the simplicity, convenience and economic efficiency in automatic day and night flashing, compared to the existing magnetic ballast, contributing to the practical use of the electronic ballast.

Claims (1)

An electronic ballast comprising: a power supply unit for full-wave rectifying and outputting power applied from the outside; A power factor improvement and constant voltage unit for converting and outputting power inputted from the power supply unit into a DC constant voltage; An inverter unit for converting a constant voltage output from the power factor improvement and the constant voltage unit into high-frequency alternating current under the control of the inverter driving unit to turn on a discharge lamp; A high voltage generator for generating a high voltage required for lighting the discharge lamp; A high-pressure cut-off unit which blocks the operation of the high-pressure generator in a no-load state in which a failure of a discharge lamp or the inside of the electronic ballast is broken; And a day and night automatic flashing unit for controlling day and night automatic flashing of the discharge lamp by energizing or powering off the power supply for controlling the power factor and the constant voltage unit, the inverter driving unit, the high voltage generating unit, and the high voltage breaking unit; The day / night automatic flasher includes: a resistor (R10), a zener diode (ZD2), and a smoothing capacitor (C13) for stepping down the full-wave rectified voltage in the power supply and generating a constant voltage; An optical sensor Cds, resistors R16 and R17, and a capacitor C12 for supplying a constant voltage through the zener diode ZD2 to provide an electric potential which varies in the OP AMP according to the intensity of day and night light; OP AMP1 and OP AMP2 for outputting signals for driving transistors TR1 and TR2 by comparing the change potential by the photosensor Cds with a reference potential; A transistor (TR1) for turning on and off the power factor improving and controlling power of the constant voltage unit, the inverter driving unit, the high voltage generator, and the high voltage blocking unit; A no-load protection circuit composed of SCR1, SCR2, diode (D4), zener diode (ZD1), resistor (R7), and capacitor (C8) in order to protect the electronic ballast in the event of a failure such as a discharge lamp or a breakage inside the electronic ballast; And a transistor (TR2) for resetting that the power factor improvement and the constant voltage unit, the inverter driver, the high voltage generator, and the high voltage interrupter are turned off due to no load of a discharge lamp. Night auto flasher.

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