CN100405682C - Spike trigger device suitable for high-power spark-gap high-voltage switching - Google Patents

Abstract

The invention belongs to the field of pulse technology and belongs to a spike trigger device suitable for high-power spark gap high-voltage switch, which includes a trigger signal source, a differential circuit, a filter shaping circuit, a signal processing unit, a DC power supply, pulse forming and power Amplifying circuit, high-voltage pulse transformer, DC blocking capacitor, and trigger signal source include control signal pulse generating circuit, sequence pulse generating circuit and single pulse generating circuit. By adopting the method of precisely controlling the waveform pulse width, pulse delay, and pulse amplitude, the output control signal pulse, single pulse or sequence pulse with adjustable frequency can meet the requirements of The working requirements for providing auxiliary ignition pulses in high-power spark gap high-voltage switches with rotating electrodes are also applicable to spark switches with fixed electrode gaps.

Description

Spike trigger device suitable for high-power spark-gap high-voltage switching

technical field

The invention belongs to the field of pulse technology, and relates to a spark gap switch, in particular to a sharp pulse trigger device suitable for high-power spark gap high-voltage switch work.

Background technique

At present, spark gap switches are used in many high-voltage and high-current pulse generators. The spark gap switch is turned on and off by the spike pulse generated by the spike trigger to excite the gas between the special-shaped electrode pairs to make it break down and conduct Therefore, the accuracy and stability of the pulse width, amplitude, and time delay of the spike pulse output by the spike trigger directly affect the accuracy and reliability of the turn-on and turn-off time of the spark gap switch.

The spike trigger circuit in the prior art is composed of a trigger signal source, a DC power supply, a pulse forming and power amplifying circuit, a high-voltage pulse transformer, and a coupling capacitor. The trigger signal source is a control signal pulse generation circuit, which includes an external signal control input interface and an impedance matching circuit. It has a simple structure and lacks a circuit for normalizing the initial signal. The DC power supply uses a single-phase power supply with high ripple coefficient and unstable voltage, which makes the amplitude of the output pulse signal inconsistent; the power amplifier circuit is not equipped with a protection circuit, and the impact resistance is poor; the structure of the high-voltage pulse transformer is unreasonable and the coupling efficiency is low. , with a small load capacity.

Contents of the invention

The present invention is a circuit for outputting a spike signal designed for the defects of the spike trigger in the prior art. The sharp pulse waveform output by the trigger device is steep, the width is adjustable, the time delay difference of each pulse is small, and the pulse amplitude is stable.

The invention includes a trigger signal source, a switch, a signal processing unit, a DC power supply, a pulse forming and power amplifying circuit, a high-voltage pulse transformer, and a DC blocking capacitor. The trigger signal source includes a control signal pulse generation circuit, a sequence pulse generation circuit and a single pulse generation circuit. The signal processing unit includes a differential circuit and a filter shaping circuit. The output ends of the control signal pulse generating circuit, the sequence pulse generating circuit and the single pulse generating circuit are respectively connected to the input end of the differential circuit through switches, the output end of the differential circuit is connected to the input end of the filter shaping circuit, and the output end of the filter shaping circuit is connected to the pulse forming and power The input terminal of the amplifier circuit is connected.

The DC power supply includes a three-phase voltage stabilizer, a filter, a three-phase isolation transformer, a rectifier circuit, a parallel filter capacitor, a resistor discharge circuit, a current limiting resistor and an energy storage capacitor. The output terminal of the three-phase voltage stabilizer is connected to the input terminal of the filter, the output terminal of the filter is connected to the input terminal of the three-phase isolation transformer, the output terminal of the three-phase isolation transformer is connected to the input terminal of the rectification circuit, and the output terminal of the rectification circuit is respectively connected to the parallel filter capacitor, The resistance discharge circuit is connected to the input terminal of the current limiting resistor, the current limiting resistor is connected in series with the energy storage capacitor, the output terminal of the parallel filter capacitor is connected to the DC bias circuit of the pulse forming and power amplifier circuit, the contact point of the current limiting resistor and the energy storage capacitor is connected to The input end of the high-voltage pulse transformer is connected, and the output end of the high-voltage pulse transformer is connected with the input end of the DC blocking capacitor.

The working process of the present invention: when the special-shaped electrode pair in the high-voltage insulating air cavity of the high-power spark gap high-voltage switch performs relative rotational movement, the high-precision position sensor installed in the air cavity detects the relative position and distance between the special-shaped electrode pair of the spark gap switch , the detection signal is input through the external signal control input interface of the control signal pulse generating circuit, the input signal is filtered and DC-blocked by the impedance matching circuit and the isolation circuit, the interference signal is isolated, and the control signal pulse is output. The sequence pulse generation circuit generates a pulse sequence of a certain frequency within 200-800Hz suitable for the high-power spark gap high-voltage switch of the rotating electrode. The single pulse generation circuit can generate a single pulse without jitter, which is suitable for the high-power spark gap of the rotating electrode. When debugging the high-voltage switch, it is necessary to test the synchronization delay, detect the discharge position of the electrode, or meet the needs of a single operation of the rotating electrode high-power spark gap high-voltage switch. The pulse signal generated by the control signal pulse generation circuit, the sequence pulse generation circuit or the single pulse generation circuit passes through the differential circuit and the filter shaping circuit to output the trigger excitation pulse with stable pulse width, amplitude and time delay. The differential circuit and the filter shaping circuit play a role Precisely control the effect of the circuit delay of the spike trigger device itself. The trigger excitation pulse is output to the input end of the pulse forming circuit and the power amplifier circuit through the signal processing unit, and the signal processing unit adopts a floating power supply to isolate from strong discharge interference.

The external power supply is input to the input terminal of the DC power supply, and the fluctuation of the grid voltage is initially reduced through the three-phase voltage stabilizer, and the DC power supply is obtained through the filter, three-phase isolation transformer, and rectification circuit, and the DC power supply is further reduced by a large-capacity parallel filter capacitor. Excellent ripple coefficient, output stable DC voltage, and provide to the DC bias circuit of the pulse forming circuit and power amplifier circuit, which ensures the stability and impact resistance of the bias potential of the pulse forming and power amplifier circuit. The trigger excitation pulse output by the signal processing unit passes through the pulse forming and power amplifying circuit, the high voltage pulse transformer, and the DC blocking capacitor to output the control signal pulse, the single working output pulse or the pulse sequence with adjustable frequency. The primary energy of the high-voltage pulse transformer is provided by the energy storage capacitor, which reduces the impact of load fluctuations on the power supply and the impact of pulse discharge on the power supply, and the power supply method of the energy storage capacitor can provide a small output impedance.

The present invention adopts the method of precisely controlling the pulse width, pulse time delay and pulse amplitude to obtain stable control signal pulses, adjustable frequency pulse sequences or single work output pulses, the output pulse waveform is steep, and the time delay difference of each pulse is small , The pulse amplitude is stable. It can meet the working requirements of providing auxiliary ignition pulses in high-power spark gap high-voltage switches with rotating electrodes, and is also suitable for spark switches with fixed electrode gaps.

Description of drawings

Accompanying drawing 1 is the circuit diagram of the present invention.

Accompanying drawing 2 is the circuit structure diagram of the present invention, also is the accompanying drawing of description. In the figure, 1 is a trigger signal source, 2 is a control signal pulse generation circuit, 3 is a sequence pulse generation circuit, 4 is a single pulse generation circuit, 5 is an external signal control input interface, 6 is an impedance matching circuit, 7 is an isolation circuit, 8 is a switch, 9 is a differential circuit , 10 filter shaping circuit, 11 signal processing unit, 12 DC power supply, 13 three-phase voltage regulator, 14 filter, 15 three-phase isolation transformer, 16 rectifier circuit, 17 parallel filter capacitor, 18 resistor discharge circuit, 19 current limiting Resistor, 20 energy storage capacitor, 21 pulse forming and power amplifying circuit, 22 pulse forming circuit, 23 power amplifying circuit, 24 resistance-capacitance absorption protection circuit, 25 balance resistor, 26 diode resistance peak suppression circuit, 27 high-voltage pulse transformer, 28 isolation Straight capacitance.

Detailed ways

The trigger signal source 1 of the present invention comprises a control signal pulse generating circuit 2, a sequence pulse generating circuit 3 and a single pulse generating circuit 4; the outputs of the control signal pulse generating circuit 2, the sequence pulse generating circuit 3 and the single pulse generating circuit 4 are respectively connected with The three input terminals of the switch 8 are connected. The control signal pulse generating circuit 2 includes an external signal control input interface 5, an impedance matching circuit 6, and an isolation circuit 7; One of the input connections. Sequential pulse generation circuit 3 is made up of a timer integrated circuit and its peripheral circuit that a model is 7555. The one-shot pulse generating circuit 4 is composed of a four-NAND integrated circuit and its peripheral circuits whose model is CD13010. The signal processing unit 11 comprises a differential circuit 9 and a filter shaping circuit 10, the input of the differential circuit 9 is connected to the output of the switch 8, the output is connected to the input of the filter shaping circuit 10, and the output of the filter shaping circuit 10 is connected to the pulse forming and power amplifier circuit 21 enter. The switch transistor in the differential circuit 9 and the filter shaping circuit 10 is 3DK4C, and the integrated block is a timer integrated circuit, the model is 7555. The signal processing unit 11 uses a floating power supply.

The three-phase voltage stabilizer 13 in the DC power supply 12 adopts a high-stability three-phase voltage stabilizer, and the three-phase isolation transformer 15 is provided with 2 to 3 groups of voltage-level taps, which can achieve different DC power supplies according to different connection methods. Voltage. The pulse forming and power amplifying circuit 21 includes a pulse forming circuit 22 , a power amplifying circuit 23 , a resistance-capacitance absorption protection circuit 24 , a balance resistor 25 and a diode peak suppression circuit 26 . The power supply input of the pulse forming circuit 22 is connected with the parallel filter capacitor 17, and the pulse forming circuit 22 receives the signal from the filter shaping circuit 10, and the output of the pulse forming circuit 22 is connected to the input of the power amplifier circuit 23; the collector of the power amplifier circuit 23 The balancing resistor 25 is connected in series, the other end of the balancing resistor 25 is connected in parallel with a diode peak suppression circuit 26, and the emitter of the power amplifier circuit 23 is connected in parallel with the RC absorption protection circuit 24; the diode peak suppression circuit 26 is connected with a high voltage pulse transformer 27. Pulse forming and power amplifying circuit 21 output terminals are connected in parallel with diode peak suppression circuit 26 to reduce the reverse peak voltage value; the collector of power amplifying circuit 23 is connected in series with balance resistor 25, so that multiple triodes can work in parallel; the emitters of power amplifying circuit 23 are connected in parallel The resistance-capacitance absorption protection circuit 24 reduces the impact of the surge voltage on the triode. The power conversion device in the pulse forming circuit and the power amplifying circuit 21 adopts two switching transistors of the model BUS13A, and the two switching transistors are used in parallel.

The high-voltage pulse transformer 27 is in the form of a CD-shaped iron core transformer. The primary wire package and the secondary wire package are placed on a certain magnetic column, and the primary coil bobbins and secondary coil bobbins are placed side by side on different length positions of the same magnetic column of the CD-shaped iron core. , the secondary coil adopts a cake structure wound in slots, which has high coupling efficiency and can improve the load carrying capacity. The primary stage of the transformer is set with 2 to 5 groups of taps. By changing the subgroup taps of the three-phase isolation transformer 15 and the primary subgroup taps of the high-voltage pulse transformer 27, the pulse amplitude output by the spike trigger device can be adjusted.

Claims (7)

1. spike trigger equipment that is applicable to the work of duty spark gap high-voltage switch gear, comprise trigger signal source (1), DC power supply (12), pulse shaping and power amplification circuit (21), high voltage pulse transformer (27), coupling capacitance (28), it is characterized in that also comprising switch (8), signal processing unit (11); Trigger signal source (1) links to each other with signal processing unit (11) input by switch (8), signal processing unit (11) output links to each other with pulse shaping and power amplification circuit (21) input, DC power supply (12) output links to each other with the dc bias circuit of pulse shaping and power amplification circuit (21), pulse shaping and power amplification circuit (21) output links to each other with high voltage pulse transformer (27) input, and high voltage pulse transformer (27) output links to each other with the capacitance input.

2. according to the spike trigger equipment that is applicable to the work of duty spark gap high-voltage switch gear described in the claim 1, it is characterized in that trigger signal source (1) comprises that control signal pulse-generating circuit (2), train pulse produce circuit (3) and single pulse produces circuit (4); Control signal pulse-generating circuit (2), train pulse produce circuit (3) and are connected with three inputs of switch (8) respectively with the output that single pulse produces circuit (4).

3. according to the spike trigger equipment that is applicable to the work of duty spark gap high-voltage switch gear described in the claim 2, it is characterized in that control signal pulse-generating circuit (2) comprises outer signal control input interface (5), impedance matching circuit (6) and buffer circuit (7); Outer signal control input interface (5), impedance matching circuit (6) and the series connection of buffer circuit (7) order, the other end of buffer circuit (7) is connected with an input of switch (8).

4. according to the spike trigger equipment that is applicable to the work of duty spark gap high-voltage switch gear described in the claim 1, it is characterized in that signal processing unit (11) comprises differential circuit (9) and filtering shaping circuit (10); The input of differential circuit (9) connects the output of switch (8), and output connects the input of filtering shaping circuit (10), and the output of filtering shaping circuit (10) connects the input of pulse shaping and power amplification circuit (21).

5. according to the spike trigger equipment that is applicable to the work of duty spark gap high-voltage switch gear described in claim 1 or 4, it is characterized in that signal processing unit (11) adopts the float power that circuit and strong discharge interference are isolated.

6. according to the spike trigger equipment that is applicable to the work of duty spark gap high-voltage switch gear described in the claim 1, it is characterized in that DC power supply (12) comprises three-phase pressurizer (13), filter (14), three-phase isolation transformer (15), rectification circuit (16), filter capacitor in parallel (17), resistance leadage circuit (18), current-limiting resistance (19) and energy storage capacitor (20); Three-phase pressurizer (13) output links to each other with filter (14) input, filter (14) output links to each other with three-phase isolation transformer (15) input, three-phase isolation transformer (15) output links to each other with rectification circuit (16) input, rectification circuit (16) output respectively with filter capacitor in parallel (17), resistance leadage circuit (18), current-limiting resistance (19) input links to each other, current-limiting resistance (19) is connected with energy storage capacitor (20), filter capacitor (17) output in parallel links to each other with the dc bias circuit of pulse shaping and power amplification circuit (21), and current-limiting resistance (19) links to each other with high voltage pulse transformer (27) input with the contact of energy storage capacitor (20).

7. according to the spike trigger equipment that is applicable to the work of duty spark gap high-voltage switch gear described in the claim 1, it is characterized in that pulse shaping and power amplification circuit (21) comprise that pulse shaping circuit (22), power amplification circuit (23), capacitance-resistance absorb protective circuit (24), balance resistance (25) and diode peak value and suppress circuit (26); The power supply input of pulse shaping circuit (22) is connected with filter capacitor in parallel (17), and pulse shaping circuit (22) receives the signal from filtering shaping circuit (10), and the output of pulse shaping circuit (22) is connected to the input of power amplification circuit (23); The collector series connection balance resistance (25) of power amplification circuit (23), the other end parallel diode peak value of balance resistance (25) suppresses circuit (26); The emitter of power amplification circuit (23) also connects capacitance-resistance absorption protective circuit (24); The diode peak value suppresses circuit (26) and is connected with high voltage pulse transformer (27).

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