KR200329076Y1 - Electric ballast for high intensity discharge lamp - Google Patents

Abstract

The present invention is designed to exhibit a more precise and stable function of the over-current protection unit 90 to control the function of the inverter switching unit 70 by sensing the current flowing to the high-pressure discharge lamp (HID) high pressure discharge lamp (HID) The invention relates to an electronic ballast 100 for a high-pressure discharge lamp that can further enhance the life and ease of use.

Description

Electronic ballast for high pressure discharge lamps {ELECTRIC BALLAST FOR HIGH INTENSITY DISCHARGE LAMP}

The present invention relates to an electronic ballast for a high-pressure discharge lamp, and more particularly, to the over-current protection unit for sensing the current flowing in the high-pressure discharge lamp to control the function of the inverter switching unit to exhibit a more precise and stable function to the high pressure discharge lamp The present invention relates to an electronic ballast for a high-pressure discharge lamp that can further enhance the service life and ease of use.

In general, the lamp is a light emitting lamp that converts electrical energy into light energy, starting with a practical carbon arc lamp, and having a efficiency of about 1 mW / W, a practical carbon bulb, a tungsten filament bulb, an iodine or bromine-filled halogen bulb, and high efficiency Glossy, low-brightness diffused light, cold light, and fluorescent lamps with long lifespan, as well as bright and refreshing, three-wavelength light emission type, are developing.

Among them, incandescent lamps are lamps that use light that is radiated at a high temperature of 600 ° C by enclosing inert gas such as argon and nitrogen in glass spheres and flowing a current through tungsten filament.

In addition, the high intensity discharge lamp (HID) uses discharge light emission in the metal vapor before and after 1 atm.

These high-pressure discharge lamps have the advantages of relatively small size, high luminous flux, high efficiency, and long life, while the temperature of the light tube gradually rises after starting at room temperature, and it takes several minutes for the steam pressure to reach its normal value. In addition, it has the disadvantage that it can not be restarted if it is cooled down and turned off once it is cooled and the vapor pressure does not drop to near room temperature value.

High pressure mercury lamp is a high-pressure mercury lamp that uses light emitted by a discharge of mercury vapor at a pressure of 0.2 to 1 MPa. By using phosphors, color rendering and efficiency are greatly improved, and general lighting such as road lighting, factory lighting, sports lighting, etc. It is widely used for lighting.

On the other hand, the light-emitting tube of the high-pressure mercury lamp is made of quartz glass with excellent heat resistance and pressure resistance, and is sealed with 2.6KPa of argon to protect the electrode, and the electrode is usually the main electrode of tungsten coil and auxiliary electrode for starting. have.

In starting and restarting the high pressure mercury lamp, when a voltage is applied to the high pressure mercury lamp, a glow discharge is generated between the main electrode and the auxiliary electrode, and an arc discharge is formed between the main electrodes. At the same time as the temperature rises, mercury also evaporates and is stabilized by evaporation completely between moisture. The lamp characteristics of the high-pressure discharge lamp are also changed by the evaporation of mercury, and the time until the stabilization is referred to as start time.

Starting performance is improved due to the interaction between mercury and argon gas (phenning effect), so the mercury vapor pressure is low at the ambient temperature below -15 ℃, and the mercury vapor pressure is high immediately after extinction. At this time, the time until the light tube is cooled and restarted is called restart time, and the KS standard stipulates it within 10 minutes.

Next, the metal halide lamp is converted into spectral energy suitable for the purpose by adding a metal halide to the high pressure mercury lamp, and is widely used for general lighting as well as radiation, photochemistry, plant growth, and fishing. have.

The structure is almost the same as that of a high-pressure mercury lamp, but a quartz light tube contains mercury and various metal halides to control the starting argon, lamp voltage, and light tube temperature.

On the other hand, ballasts for high-pressure discharge lamps can be generally divided into magnetic and electronic. Among them, magnetic ballasts are inexpensive, simple coil type, and have a low defect rate. There is a trend.

However, magnetic ballasts are bulky, weigh about 2.5Kg ~ 4Kg, and lamp life is shorter than electronics.

Accordingly, the present applicant intends to significantly improve the shortcomings of the existing magnetic ballast and contribute to the industrial development by releasing high-quality products to the domestic lighting market, and propose an electronic ballast for a high-pressure discharge lamp having excellent low cost and stability.

The present invention is designed through the above-described proposal, and an object thereof is to provide an electronic ballast for a high-pressure discharge lamp that can more safely and accurately protect the high-pressure discharge lamp from overcurrent.

1 is a circuit diagram showing an electronic ballast for a high-pressure discharge lamp according to the present invention.

Explanation of symbols on the main parts of the drawings

10: surge suppressor 20: line filter

30: noise ground 40: rectifier

50: choke input smoothing voltage distribution unit 60: trigger unit

70: inverter switching unit 80: starting condenser unit

90: overcurrent protection unit 100: electronic ballast for high-pressure discharge lamp

C1: Noise canceling capacitor D1: Diac

D2: Diode D3: Diac

D4, D5: Diode F1: First FET

F2: Second FET F3: Field Effect Transistor

HID: High pressure discharge lamp L: Self oscillation part

OC: Starting Capacitor OT: Output Transformer

P: Pickup coil R1, R3: Resistance

R2, R4: bleed resistor R4: bleed resistor

The present invention for achieving the above object,

The trigger unit generates a trigger pulse when the DC power boosted through the choke input smoothing double voltage unit gradually rises according to the time constant while smoothing the output power of the rectifying unit to a DC power source having a low ripple. And a high frequency power source of the inverter switching unit for converting the DC power boosted and doubled into a high frequency power source through the choke input smoothing double voltage unit while being interlocked with the self-oscillating unit by the trigger pulse of the trigger unit to a high frequency power source. Electronic ballast for the high voltage discharge lamp comprising an output transformer for supplying and an overcurrent protection unit for detecting the current flowing through the output transformer through a pickup coil to turn off the function of the inverter switching unit when an overcurrent flows in the high-pressure discharge lamp To

The overcurrent protection part includes a field effect transistor which is connected to a pickup coil which detects a current wound on the secondary side of the output transformer part and turns off the inverter switching part when supplied with a direct current of 35V or more. .

Hereinafter, a preferred embodiment of the electronic ballast for a high-pressure discharge lamp according to the present invention will be described with reference to the drawings.

The electronic ballast 100 for a high-pressure discharge lamp converts a commercial AC power source (220V / 60Hz) into a predetermined DC power source, and generates a complex frequency modulated wave having a high frequency characteristic of a predetermined value or more by using the DC power source to provide a stable AC voltage. To provide a power supply.

While the high voltage discharge lamp (HID) is normally turned on, a stable AC voltage is always supplied to the arc tube tube inside the high pressure discharge lamp (HID), but the high voltage discharge lamp (HID) is damaged, aging or the electronic ballast 100 for the high pressure discharge lamp. If abnormality occurs or wiring is incorrect during wiring, even though AC voltage is supplied to the high voltage discharge lamp (HID), it may not be lit or may turn on after a long time. The circuit elements of) may be easily damaged by overvoltage or the internal resistance may increase, resulting in a fire.

Therefore, the electronic ballast 100 for a high-pressure discharge lamp that can more easily and easily use the present applicant will be proposed with reference to FIG.

1 is a circuit diagram showing an electronic ballast 100 for a high-pressure discharge lamp according to the present invention.

The electronic ballast 100 for a high-pressure discharge lamp according to the present invention is a surge suppression unit 10 (varistor) to accept the external AC power supply and block the surge voltage, as shown in Figure 1, the surge suppression unit 10 It is provided with a line filter unit 20 for blocking the electromagnetic interference (EMI) contained in the alternating current power supply.

In addition to the line filter unit 20, a noise grounding unit 30 for grounding bidirectional noise and harmonic components of the rear stage through the field ground FG is included, and an AC power supply passing through the noise grounding unit 30 is provided. A rectifier 40 for converting to a DC power is provided, and the DC power boosted through the choke input smoothing voltage divider 50 for boosting and boosting voltage while smoothing the output power of the rectifier 40 to a DC power having low ripple. It has a trigger unit 60 which gradually rises with time constant and reaches the reference voltage (direct current 35V) to pass through the die solution D1 to generate a trigger pulse.

In addition, the DC power boosted and boosted through the choke input smoothing double voltage unit 50 is turned on and off in conjunction with the self-oscillating unit L according to the trigger pulse of the trigger unit 60 to a high frequency power source (20,000 kV). An inverter switching unit 70 for converting and an output transformer unit OT for supplying the high frequency power of the inverter switching unit 70 to the high voltage discharge lamp HID, and the output transformer unit OT and LC resonance coupling To detect the current flowing through the starter condenser 80 and the output transformer OT through the pick-up coil P to provide a high frequency high voltage to the high voltage discharge lamp HID. In this case, the overcurrent protection unit 90 for turning off the function of the inverter switching unit 70 is included.

Looking at the operation and operation of the electronic ballast 100 for a high-pressure discharge lamp according to the present invention made of such a configuration as follows.

First, when an external power source, for example, AC power 220V 60 kW is supplied to the electronic ballast 100 for a high-pressure discharge lamp according to the present invention, it is converted into DC power via the rectifying unit 40, and then the choke input smoothing double voltage unit By 50, the voltage is smoothed, boosted, and doubled to about 340V to 500V.

When the DC voltage rises for about 0.5 seconds according to the time constant in the trigger unit 60 and reaches the reference voltage DC 35V, the die solution D1 generates a trigger pulse. Accordingly, the inverter switching unit 70 The first FET F1 is momentarily activated.

The trigger unit 60 is for starting the first FET F1 and the second FET F2, which are active elements of the inverter switching unit 70, by the self-oscillating oscillation circuit, and the first FET F1 is turned on. The trigger signal is induced at the gate of the second FET F2 due to the induction phenomenon of the oscillation unit L at the moment of being turned off and then the first FET F1 and the second FET F2 are alternately thereafter. In general, the on and off oscillation is performed.

At this time, the DC power smoothed, boosted and doubled to 340V through the choke input smoothing voltage distribution unit 50 alternately turns on the first FET F1 and the second FET F2 of the inverter switching unit 70. By the off oscillation action, each is converted into 170V of 20,000 kW of alternating current, and the on / off operation of the inverter switching unit 70 is controlled by the oscillation unit L by itself.

In addition, 170V of AC 20,000 kW converted by the inverter switching unit 70 may be provided to the high-pressure discharge lamp HID through the output transformer OT to be turned on through the initial discharge.

When the initial lighting is turned on, the current flowing through the high voltage discharge lamp (HID) (load increase) leads to the combined action of dropping the Q of the LC resonance circuit. Therefore, the counter electromotive force (2KV) generated during the initial lighting is gradually lowered, resulting in 90V. Stable within, while the increased capacity of the capacitor (C3) increases the drive current of the discharge lamp, so the electronic ballast 100 for the high-pressure discharge lamp is the optimal condition for turning on the high-pressure discharge lamp (HID) (low voltage / When it is stable at high current, it is naturally converted to a stable voltage of about 90V and a constant current).

On the other hand, between the choke input smoother and the output transformer OT, the LC capacitor is coupled to the LC upon initial ignition and provides a high voltage to the high voltage discharge lamp HID. The condenser 80 is connected in parallel to the high voltage discharge lamp HID. And a starting capacitor (OC), which charges the power supplied from the output transformer unit (OT) and discharges it to the high-pressure discharge lamp (HID) when it is turned on again, thereby resetting the lighting time. To minimize it.

In addition, the overcurrent protection unit 90 controls the function of the inverter switching unit 70 by sensing a current flowing through the high voltage discharge lamp (HID), and the user inadvertently turns off the electronic ballast 100 for the high voltage discharge lamp. If you want to turn on again after to prevent the destruction of the high-pressure discharge lamp (HID) or burnout of the electronic ballast 100 for the high-pressure discharge lamp.

The overcurrent protection unit 90 is wound on the secondary side of the output transformer OT and connected in series to a pickup coil P for detecting current, thereby converting an AC into a direct current and a diode D2. Is connected in parallel to the diac (D3) and the diac (D3), which are connected to the resistor (R1) and the bleed resistor (R2) for voltage control, and supplied when a DC voltage of 35 V or more is supplied through the diode (D2). A noise removing capacitor C1 for removing the component and a field effect transistor for turning off the inverter switching unit 70 by turning on the diodes D4 and D5 when a direct current of 35V or more is supplied through the die solution D3. F3) and a resistor R3 for protecting the field effect transistor F3 and a bleed resistor R4 for voltage control.

Since the internal current is equal to 0Ω in a state where the high voltage discharge lamp HID is overheated, the overcurrent protection unit 90 suddenly flows current to the high voltage discharge lamp HID when power is turned on. The high voltage discharge lamp (HID) is destroyed or the electronic ballast 100 for the high pressure discharge lamp is burned out. As an alternative, the high pressure discharge lamp (HID) is turned off. It is designed.

That is, in the present invention, in such a case, the overcurrent that can be supplied to the high-pressure discharge lamp HID is detected through the current detecting pickup coil P configured as the secondary winding of the output transformer OT. When the value exceeds the set value, the field effect transistor F3 turns on the diodes D4 and D5 so that the trigger signal provided from the die solution D1 of the trigger unit 60 turns on the diodes D4 and D5. Passing through allows the field effect transistor F3 to turn off the first FET F1, thereby protecting the high voltage discharge lamp HID from overcurrent that may be provided to the high voltage discharge lamp HID. do.

This function works by automatically adjusting the time so that if the high-pressure discharge lamp (HID) is cooled down early (for example, a lamp installed outdoors in winter), the lamp is turned on again within 10 to 3 minutes normally. Adaptive ignition that automatically adjusts the re-lighting time according to the characteristics of the high-pressure discharge lamp (HID) even when the surrounding environment of the high-pressure discharge lamp (HID) is changed or when it is replaced with a high-pressure discharge lamp (HID) having a slightly different specification. The circuit function will be implemented.

As described above, according to the electronic ballast 100 for a high-pressure discharge lamp according to the present invention, the over-current protection unit 90 for detecting the current flowing in the high-pressure discharge lamp (HID) to control the function of the inverter switching unit 70 It is designed to show more precise and stable function, and it has an excellent effect to further increase the life and ease of use of the high voltage discharge lamp (HID).

Claims (2)

When the DC power boosted through the choke input smoothing voltage multiplier 50 for smoothing the output power of the rectifier 40 to a DC power source with low ripple and boosting and doubles the voltage is gradually increased according to the time constant to reach the reference voltage. The trigger unit 60 for generating a trigger pulse and the booster through the choke input smoothing voltage distribution unit 50 while being linked on and off together with the self-oscillating unit L by the trigger pulse of the trigger unit 60. An output transformer OT for supplying a high frequency power of the inverter switching unit 70 for converting the doubled DC power to a high frequency power to the high voltage discharge lamp HID, and a current flowing through the output transformer OT is picked up. For the high voltage discharge lamp comprising an over-current protection unit 90 to detect through the coil (P) to turn off the function of the inverter switching unit 70 when the over-current flows in the high-pressure discharge lamp (HID). In the ballast 100, The overcurrent protection unit 90 is connected to a pickup coil P which is wound on the secondary side of the output transformer OT and detects a current, and when the DC current is supplied 35 V or more, the electric field for turning off the inverter switching unit 70. An electronic ballast for a high voltage discharge lamp comprising an effect transistor (F3). The method of claim 1, The overcurrent protection unit 90 A diode D2 wound in the secondary side of the output transformer OT and connected in series to a pickup coil P for detecting a current to convert AC into a direct current; A resistor R1 protecting the diode D2 and a bleed resistor R2 for voltage control; When the direct current 35V or more through the diode (D2) is passed through the die solution (D3), A noise removing capacitor C1 connected in parallel to the die solution D3 to remove noise components; The resistor R3 and the voltage control for protecting the field effect transistor F3 which turns off the inverter switching unit 70 by turning on the diodes D4 and D5 when the direct current 35V or more is supplied through the die solution D3. Electronic ballast for high-pressure discharge lamp, characterized in that comprises a bleed resistor (R4) for.