KR940003775B1 - Electronic neon tube transformer - Google Patents

Abstract

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Description

Electronic neon tube transformer

1 is a block diagram of an electronic neon tube transformer according to the present invention.

2 is a circuit diagram of the power driver of FIG.

3 is a circuit diagram of the DC-AC converter of FIG.

4 is a circuit diagram of the high voltage induction part and the detection part of FIG.

5 is a circuit diagram of a comparison unit of FIG.

* Explanation of symbols for main parts of the drawings

1 noise filter unit 2 constant voltage rectifying unit

3: Commercial frequency double voltage rectifier 4: PWM unit

5: DC-AC conversion unit 6: power drive unit

7: high voltage induction unit 8: detection unit

9 comparison unit L1 to L8 coil

R1 to R12: resistors C1 to C8: capacitors

D1 to D17: diodes Q1 to Q4: transistors

T1, T2: Transformer CP: Comparator

ZD: Zener Diode

The present invention relates to an electronic neon tube transformer.

Conventional neon sign transformers are made of silicon steel cores to boost commercial frequency power and turn them on. Lighting conditions are uneven due to fluctuations in input voltage, vibrations occur, and a lot of power consumption occurs due to magnetic leakage. There was a problem in that the weight and volume is large and noise occurs. In addition, when the neon tube is broken or disconnected, high voltage is discharged, which may cause an electric shock or a fire.

In order to solve the above problems, the present invention uses a high frequency method and a ferrite core to reduce the number of turns of the coil and increase the power factor to reduce the volume and weight, and completely block the output when the neon tube is broken or disconnected to protect the device and give an electric shock or Its purpose is to provide an electronic neon tube transformer to prevent fire.

In order to achieve the above object, the present invention provides a commercial frequency double voltage rectifying means for converting an AC commercial power applied from the outside into a DC power source, and rectifying the AC commercial power applied from the outside to a constant voltage of 12V. Pulse width modulation means (PWM: Pulse Width Modulation) for outputting a square wave signal having a phase difference of 180 ° by pulse width modulating the signal rectified by the constant voltage rectifying means is connected to the constant voltage rectifying means, the constant voltage rectifying means; A DC-AC conversion means connected to a commercial frequency double voltage rectifying means for converting a DC power output from the commercial frequency double voltage rectifying means into a high frequency AC power source, and connected to the pulse width modulation means and a DC-AC conversion means. Of the DC-AC conversion means by using a signal output from the width modulation means Power driving means for generating a signal for controlling copper, high voltage inducing means connected to the DC-AC converting means and inducing high-frequency AC power output from the DC-AC converting means to a high voltage to supply a neon tube, the high voltage inducing Detection means connected to the means for detecting the high voltage induced by the high voltage inducing means, and a voltage connected to the detection means and the pulse width modulation means to compare the voltage detected by the detection means and output the result to the pulse width modulation means. By controlling the operation of the pulse width modulation means characterized in that it comprises a comparison means for controlling the power supply to the neon tube of the high voltage induction means.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

1 is a block diagram showing a schematic configuration of an electronic neon tube transformer according to the present invention, 1 is a noise filter unit, 2 is a constant voltage rectifier, 3 is a commercial frequency double voltage rectifier, 4 is a pulse width modulation unit, and 5 is a direct current. AC converter, 6 is a power driver, 7 is a high voltage induction part, 8 is a detection part, and 9 is a comparison part.

As shown in FIG. 1, the electronic neon tube transformer according to the present invention includes a noise filter unit 1, a constant voltage rectifying unit 2, a commercial frequency double voltage rectifying unit 3, a PWM unit 4, a DC-AC converter ( 5), a power supply driving section 6, a high voltage inducing section 7, a detecting section 8, and a comparing section 9.

The noise filter 1 removes the noise of the AC commercial power supply to be supplied to the constant voltage rectifier 2 and the commercial frequency double voltage rectifier 3.

The constant voltage rectifying unit 2 rectifies the AC commercial power supplied by the noise filter unit 1 to a 12V constant voltage and supplies it to the PWM unit 4.

The commercial frequency double voltage rectifying unit 3 converts the AC commercial power applied by the noise filter unit 1 into a DC voltage and supplies the DC voltage to the DC-AC converter 5.

The PWM unit 4 is composed of a commercially available chip and pulse-width modulates the power rectified by the constant voltage rectifier 2 to the power driver 6.

The power driver 6 generates a signal for driving the DC-AC converter 5 using the signal output from the PWM unit 4.

The DC-AC converter 5 converts the DC power supplied from the commercial frequency double voltage rectifying unit 3 into a high frequency AC power under the control of a signal output from the power driving unit 6 to generate the high voltage induction unit 7. Supplies).

The high voltage induction part 7 induces the high frequency AC voltage output from the DC-AC converter 5 to a high voltage to supply the neon tube to turn on the neon tube.

The detection unit 8 detects the induced high voltage of the high voltage induction unit 7, and the comparison unit 9 compares the detected voltage of the detection unit 8 and controls the power driver 6 as a result. The output of the high voltage induction unit 7 can be completely interrupted at the time of disconnection or short circuit by outputting to the PWM unit 4.

FIG. 2 is a circuit diagram of the power driver 6 of FIG. 1, where L1 to L5 are coils, C1 to C4 are capacitors, R1 to R4 are resistors, and D1 to D4 are diodes, respectively.

The power driver 6 is a secondary coil composed of a primary coil L5 having a square wave having a 180 ° phase difference output from the PWM unit 4 and four coils L1, L2, L3, and L4. And a transformer T1 for outputting a waveform having a 180 ° phase difference to the DC-AC converter 5, and both ends of the secondary coils L1, L2, L3, and L4 of the transformer T1. Condenser C1, C2, C3, and C4 connected to match the values of the coils L1, L2, L3, and L4 to correct the waveform.

3 is a circuit diagram of the DC-AC converter 5 of FIG. 1, Q1 to Q4 represent npn transistors, and D5 to D12 represent diodes, respectively.

The DC-AC converter 5 is composed of npn transistors Q1, Q2, Q3, and Q4 to which a signal having a 180 ° phase difference output from the power driver 6 is input as a base. Npn transistors (Q1, Q4) and npn transistors (Q2, Q3) alternately operate according to the output signal of the frequency of DC 280V of the commercial frequency double-voltage rectifier (3) inputted to the collector to correspond to 26KHz. Is converted into an AC voltage and outputted to the high voltage induction part 7.

The detailed configuration of the DC-AC converter 5 is as follows.

The npn transistors Q1 and Q2 have a DC 280V input to a collector, an anode of diodes D9 and D10 are respectively connected to an emitter, and the high voltage induction part 7 is connected to the cathodes of the diodes D9 and D10. Connect the collectors of the npn transistors Q3 and Q4 for outputting the converted AC voltage, and connect the diodes D11 and D12 to the emitter and the ground of the npn transistors Q3 and Q4, respectively, The diodes D5 and D6 are connected to the collectors of the npn transistors Q1 and Q2 and the cathodes of the diodes D9 and D10, respectively, and the diodes D7 and D8 are connected to the collector and the ground of the npn transistors Q3 and Q4. ) To connect each. The diodes D5 to D12 serve to protect the npn transistors Q1 to Q4.

4 is a circuit diagram of the high voltage induction part 7 and the detection part 8 of FIG. 1, T2 is a transformer, L6, L7, L8 is a coil, C5, C6 is a capacitor, D13, D14 is a diode, respectively.

The high voltage induction part 7 supplies an AC voltage corresponding to ± 280 V output from the DC-AC converter 5 to the primary coil L6 and induces the supplied AC voltage according to the turns ratio of the coil. It consists of a transformer (T2) consisting of a secondary coil (L7) for supplying power to the neon tube, and additionally connecting the high-voltage diode (D13) to the upper end of the secondary coil (7) for the initial point, etc. Condenser C5 is connected in parallel at both ends.

The high voltage (V _o ) induced in the transformer (T2) is

Determined by Where N1 and N2 are the number of windings of the primary and secondary coils, Vin is the voltage input to the primary coil, T _ON is the ON time, and T is the period plus the ON time and OFF time, respectively. .

The detection unit 8 is composed of the secondary coil L8 of the primary coil L7 of the high voltage induction unit 7 so that the turns ratio N2 / N1 of the primary coil L7 and the secondary coil L8 The voltage induced by the?) Is half-wave rectified through the diode D14 connected to the upper end of the secondary coil L8 and supplied to the comparator 9.

5 is a circuit diagram of the comparator 9 of FIG. 1, CP is a comparator, D15 to D17 is a diode, ZD is a zener diode, C6 to C8 is a capacitor, and R5 to R12 are resistances, respectively.

The comparator 9 may include a zener diode ZD in which a DC voltage output from the detector 6 is input to a cathode, a diode D17 having an anode connected to an anode of the zener diode ZD, and the diode. A capacitor (C8) connected to the anode and ground of (D17), a resistor (R5) connected in parallel across the capacitor (C8), a gate is connected to the cathode of the diode (D17), and an anode to the power supply (V _cc ). A SCR (Wood Controlled Rectifier) connected to a wood, an anode connected to a cathode of the SCR, and a cathode connected to the PWM unit 4, a diode D15, and an output terminal and a resistor R10 of the detector 6 A comparator (CP) connected through, a capacitor (C7) connected to the output terminal and the ground of the detector (6), a resistor (R11) connected in parallel across the capacitor (C7), a capacitor (C6) connected in parallel across the resistor (R11) A resistor (R12) connected to a reference value input terminal (+) of the comparator (CP) and a ground; A resistor R9 connected to a power supply V _cc and a reference value input terminal (+) of the comparator CP, a resistor R8 connected to a reference value input terminal (+) and an output terminal of the comparator CP, and the comparator CP. It consists of a diode (D16) connected to the output of the operation as follows.

The DC voltage output from the detection unit 6 is supplied to the gate of the SCR via the zener diode ZD, and when an abnormality occurs, the operation of the PWM unit 4 is stopped through the diode D15.

In addition, the DC voltage output from the detection unit 6 is input to the comparator CP through the resistor R10 and compared with the reference values of the resistors R9 and R12. When an abnormality occurs, the DC voltage is passed through the diode D16. The signal is supplied to the PWM unit 4 to completely block the output of the PWM unit 4, thereby protecting the circuit safely even in the event of disconnection or short circuit.

The present invention configured and operated as described above uses a high frequency method to reduce the number of turns of the coil by using a high frequency resonance and uses a ferrite core having a high permeability to maximize power factor, thereby reducing power consumption, and reducing volume and weight. It can be reduced to 1/8 and completely cut off the output in case of disconnection or short circuit, protecting the device itself and eliminating the risk of electric shock or fire.

Claims (7)

In electronic neon tube transformer; A commercial frequency double voltage rectifying means (3) for converting an AC commercial power applied from the outside into a DC power source, a constant voltage rectifying means (2) for rectifying the AC commercial power applied from the outside to a constant voltage of 12V, and the constant voltage rectifying means ( 2) a pulse width modulation means (PWM) for outputting a square wave signal having a phase difference of 180 ° by pulse width modulating the signal rectified by the constant voltage rectifying means 2 and outputting the same; A DC-AC converter 5 connected to a commercial frequency double voltage rectifying means 3 and converting a DC power output from the commercial frequency double voltage rectifying means 3 into a high frequency AC power source; ) And a power source driving number connected to the DC-AC converter 5 to generate a signal for controlling the driving of the DC-AC converter 5 using a signal output from the pulse width modulation means 4. (6), high voltage induction means (7) connected to the DC-AC conversion means (6) for inducing high frequency AC power output from the DC-AC conversion means (6) to a neon tube and supplying it to the neon tube; A detection means 8 connected to the means 7 for detecting the high voltage induced by the high voltage inducing means 7 and a detection means 8 connected to the detection means 8 and the pulse width modulation means 4. Control the operation of the pulse width modulating means 4 by outputting the result to the pulse width modulating means 4 and controlling the supply of power to the neon tube of the high voltage inducing means 7. Electronic neon tube transformer, characterized in that consisting of a comparison means (9). The method of claim 1, further comprising a noise filter means (1) connected to the constant voltage rectifying means (2) and the commercial frequency double voltage rectifying means (3) to remove noise of the applied AC commercial power supply. An electronic neon tube transformer. 3. The power source driving means (6) according to claim 1 or 2, wherein the power source driving means (6) is provided with a primary side coil (L5) and first, with a square wave signal having a 180 ° phase difference output from the pulse width modulating means (4). Transformer T1 composed of the second, third and fourth secondary side coils L1, L2, L3, and L4 and the first, second, third, and fourth secondary side coils L1 of the transformer T1; First, second, and second signals connected to both ends of L2, L3, and L4 to ensure signal waveforms output to the first, second, third, and fourth secondary coils L1, L2, L3, and L4, respectively. Electronic neon tube transformer, characterized in that consisting of the third and fourth capacitor (C1, C2, C3, C4). The DC-AC converting means (5) according to claim 1 or 2, wherein the DC-AC converting means (5) is a direct current output from the commercial frequency double-voltage rectifying means (3) as a base input of the signal output from the power supply driving means (6). The first npn transistor Q1 for switching operation by connecting the power to the collector and connecting the emitter to the high voltage inducing means 7, and the signal output from the power driving means 6 as the base input and the commercial frequency The second npn transistor Q2 which alternately switches with the first npn transistor Q1 by connecting an emitter to the high voltage inducing means 7 as a collector input using the DC power output from the double voltage rectifying means 3 as a collector input. The signal output from the power source driving means 6 is used as a base input, and a collector is connected to an emitter of the first npn transistor Q1, and an emitter is grounded, so that the first npn A collector is connected to an emitter of the second npn transistor Q2 as a base input using a third npn transistor Q3 alternately switching between the transistor Q1 and a signal output from the power source driving means 6. And the emitter is grounded and is composed of a fourth npn transistor (Q4) switching alternately with the second npn transistor (Q2). The transformer T2 according to claim 1 or 2, wherein the high voltage inducing means 7 induces the AC power output from the DC-AC converting means 5 and supplies it to the neon tube, and the transformer T2. It consists of a first diode (D13) connected to the secondary side of) and a condenser (5) connected in parallel to the first diode (D13) consisting of a neon tube initial lighting means for performing the initial lighting function of the neon tube. Electronic neon tube transformer. The zener diode (ZD) connected to the detection means (8), a gate connected to the zener diode (ZD), and an anode is applied to the power supply (Vcc). A silicon controlled rectifier (SCR) connected to the pulse width modulation means 4 so that a signal for controlling the pulse width modulation means 4 is output when an abnormal state of the high voltage inducing means 7 occurs. And a comparator (CP) having an input connected to the detection means (8) and an output connected to the pulse width modulation means (4). 6. The detecting device (8) according to claim 5, wherein the detecting means (8) comprises a coil (L8) added to the secondary side of the transformer (T2) of the high voltage inducing means (7), and a second diode (D14) connected to the coil (L8). Electronic neon tube transformer, characterized in that consisting of.