Large-energy ignition trigger device for sphere gap switch

Abstract

The invention provides a large-energy ignition triggering device for a sphere gap switch, which can well meet the use requirements of the sphere gap switch device in the field of high-voltage tests and ensure the reliability and stability of ignition triggering. Comprising a light-operated charging circuit which is used for charging according to a charging signal sent by a test control end; the direct-current boosting module is connected with the light-operated charging circuit, the light-operated trigger ignition circuit and the energy storage circuit and used for boosting the voltage of the power supply to a voltage value required for driving a subsequent circuit; the light-operated charging feedback circuit is connected with the direct-current boosting module and the energy storage circuit and is used for feeding back the full electric signal to a test control end; the light-operated trigger ignition circuit is connected with the sphere gap switch and is used for performing trigger ignition action on the sphere gap switch; the energy storage circuit is connected with the sphere gap switch and is used for releasing charges and discharging through the sphere gap switch; the light-operated charging circuit, the light-operated trigger ignition circuit, the light-operated charging feedback circuit and the test control end are all in optical fiber communication.

Description

Technical Field

[0001] The invention relates to the technical field of high-voltage test equipment, in particular to a high-energy ignition trigger device for a spherical gap switch. Background Art

[0002] A spherical gap switch is a device that uses the principle of air gap discharge between spherical electrodes to achieve conduction or isolation of high-voltage circuits. Its working principle is to ionize the air between the gaps through external triggering (such as pulsed laser or high-voltage electric pulse), lower the breakdown voltage threshold, and achieve synchronous conduction of the high-voltage circuit. Moreover, due to the advantages of the spherical gap switch such as simple structure, no mechanical delay in operation, high voltage resistance, fast response, and automatic recovery of the gap insulation after discharge, it has irreplaceable advantages in fields such as lightning impulse and high-voltage synthetic testing that require precise timing control and voltage resistance. For example, in the synthetic test of high-voltage AC circuit breakers, the spherical gap switch is triggered to conduct, allowing the pre-charged synthetic voltage source circuit to pass through, and high voltage (hundreds of kilovolts) or large current (tens of kiloamperes) to be applied to the test product in an extremely short time (microseconds), completing the high-current interruption test of high-voltage electrical products, especially circuit breakers. Therefore, whether the spherical gap switch can be triggered stably and reliably directly determines the success or failure of the synthetic test.

[0003] In a high-voltage ball gap switch, the ignition trigger device is a key component that controls the precise breakdown of the ball gap switch. Currently, there are three commonly used ignition device triggering methods at home and abroad:

[0004] 1) The trigger energy is provided by a high-voltage pulse transformer;

[0005] 2) The trigger energy is provided by the discharge of the charged capacitor;

[0006] 3) The trigger energy is provided by the laser;

[0007] However, the above three triggering methods each have their own advantages and disadvantages. The use of a high-voltage pulse transformer to provide triggering energy has a simple circuit, but it is difficult to increase the voltage and triggering energy of the pulse transformer; the triggering energy is provided by the discharge of the charging capacitor, and the triggering energy can be increased by increasing the capacitance value and the charging voltage, but compared with the other two triggering methods, its control circuit is relatively complex; the use of laser triggering can effectively reduce the breakdown delay and jitter dispersion, but the equipment maintenance and use conditions are relatively high. Summary of the Invention

[0008] In response to the above problems, the present invention provides a high-energy ignition trigger device for a spherical gap switch, which can perfectly meet the use requirements of spherical gap switch devices in the high-voltage test field and ensure reliable and stable ignition triggering.

[0009] The present invention adopts the following technical solution: a high-energy ignition trigger device for a ball gap switch, comprising a light-controlled charging circuit, a DC boost module, a light-controlled trigger ignition circuit, a light-controlled charging feedback circuit, an energy storage circuit, and a ball gap switch. The light-controlled charging circuit, the light-controlled trigger ignition circuit, the light-controlled charging feedback circuit, and the test control terminal all use optical fibers for information transmission; wherein,

[0010] a light-controlled charging circuit, connected to a power supply, and configured to perform a charging operation according to a charging signal sent by the test control terminal;

[0011] A DC boost module is connected to the light-controlled charging circuit, the light-controlled trigger ignition circuit, and the energy storage circuit, and is used to increase the power supply voltage to a voltage value required to drive subsequent circuits;

[0012] A light-controlled charging feedback circuit is connected to the DC boost module and the energy storage circuit, and is used to feed back a full-charge signal to the test control terminal after the energy storage module is fully charged;

[0013] A light-controlled trigger ignition circuit is connected to the ball gap switch and is used to trigger the ignition action of the ball gap switch according to the ignition trigger signal sent by the test control terminal;

[0014] The energy storage circuit is connected to the ball gap switch and is used to release the charge after the light-controlled trigger ignition circuit is triggered, and discharge the charge through the ball gap switch.

[0015] Furthermore, the device also includes a signal feedback circuit and a coupling trigger circuit; wherein,

[0016] The signal feedback circuit is connected to the DC boost module, the light-controlled charging feedback circuit, and the energy storage circuit, and is used to output a feedback signal to the light-controlled charging feedback circuit after the energy storage module is fully charged, and to release the charge of the energy storage circuit when the charging state is stopped;

[0017] The coupling trigger circuit is connected between the light-controlled trigger ignition circuit and the ball-gap switch, and is used to perform voltage coupling on the discharge voltage output by the light-controlled trigger ignition circuit after the light-controlled trigger ignition circuit receives the ignition trigger signal, and output a high-voltage pulse to the ball-gap switch, so that the ball gap of the ball-gap switch breaks down;

[0018] Furthermore, the power supply adopts a 24V DC power supply, and the voltage output range of the DC boost module is 24V to 850V;

[0019] Furthermore, the light-controlled charging circuit includes a resistor R1, a resistor R2, an optical signal transceiver Q1, a transistor Q2, and a first solid-state relay. The resistor R1, the coil K1-1 of the first solid-state relay, and one end of the normally open contact K1-2 of the first solid-state relay are connected and then connected to the positive electrode of the power supply. The other end of the resistor R1 is connected to one end of the optical signal transceiver Q1, and the other end of the optical signal transceiver Q1 is connected to one end of the resistor R2 and the base of the transistor Q2. The other end of the coil K1-1 of the first solid-state relay is connected to the collector of the transistor Q2, and the other end of the resistor R2 is connected to the emitter of the transistor Q2 and then connected to the negative electrode of the power supply. The other end of the normally open contact K1-2 of the first solid-state relay and the emitter of the transistor Q2 are both connected to the DC boost module.

[0020] Furthermore, the light-controlled charging feedback circuit includes a resistor R3, a MOS transistor Q3, an optical signal transceiver Q4, a diode D1, a varistor RV1, a varistor RV2, and a second solid-state relay. The cathode of the diode D1, one end of the varistor RV1, one end of the coil K2-1 of the second solid-state relay, and one end of the optical signal transceiver Q4 are all connected, and then connected to the other end of the normally open contact K1-2 of the first solid-state relay and the input end Vin of the DC boost module. The other end of the optical signal transceiver Q4 is connected to one end of the resistor R3, and the other end of the resistor R3 is connected to one end of the normally open contact K2-2 of the second solid-state relay. The other end of the normally open contact K2-2 of the second solid-state relay is connected to the anode of the diode D1, the other end of the varistor RV1, the other end of the coil K2-1 of the second solid-state relay, one end of the varistor RV2, and the drain of the MOS transistor Q3. The other end of the varistor RV2 is connected to the source of the MOS transistor Q3 and then grounded.

[0021] Furthermore, the signal feedback circuit includes a third solid-state relay, resistors R4 to R9, and diodes D2 to D8. One end of the coil K3-1 of the third solid-state relay is connected to the input end Vin of the DC boost module, and the other end of the coil K3-1 of the third solid-state relay is connected to the ground end of the DC boost module. The output end Vout of the DC boost module is connected to the positive electrode of the diode D2, and the negative electrode of the diode D2 is connected to one end of the resistor R4. The other end of the resistor R4 is connected to the resistor R5, one end of the resistor R8, and one end of the normally closed contact K3-2 of the third solid-state relay. The other end of the resistor R5 is connected to the negative electrode of the diode D5, and the positive electrode of the diode D5 is connected to the negative electrode of the diode D6. The anode of the diode D6 is connected to the cathode of the diode D7, the anode of the diode D7 is connected to the cathode of the diode D8, the anode of the diode D8 is connected to the cathode of the diode D3 and one end of the resistor R6, the other end of the resistor R6 is connected to the anode of the diode D3, the cathode of the diode D4, and one end of the resistor R7, and then connected to the gate of the MOS transistor Q3, the other end of the normally closed contact K3-2 of the third solid-state relay is connected to one end of the normally closed contact K3-3 of the third solid-state relay, the other end of the normally closed contact K3-3 of the third solid-state relay is connected to one end of the resistor R9, the other end of the resistor R7 is connected to the anode of the diode D4 and the other end of the resistor R9, and then connected to the ground end of the DC boost module;

[0022] Furthermore, the energy storage circuit includes diodes D9 to D12, inductors L1 to L4, and capacitors C1 to C4; the spherical gap switch includes an auxiliary spherical gap switch GP1 and a main spherical gap switch GP2; one end of the capacitor C1 is connected to the positive electrode of the diode D9 and then connected to the ground end of the DC boost module, one end of the capacitor C2 is connected to the positive electrode of the diode D10 and then connected to the ground end of the DC boost module, one end of the capacitor C3 is connected to the positive electrode of the diode D11 and then connected to the ground end of the DC boost module, and one end of the capacitor C4 is connected to the positive electrode of the diode D12 and then connected to the ground end of the DC boost module. The other end of the capacitor C1 is connected to the cathode of the diode D9 and then to one end of the inductor L1. The other end of the capacitor C2 is connected to the cathode of the diode D10 and then to one end of the inductor L2. The other end of the capacitor C3 is connected to the cathode of the diode D11 and then to one end of the inductor L3. The other end of the capacitor C4 is connected to the cathode of the diode D12 and then to one end of the inductor L4 and the other end of the resistor R8. The other ends of the inductors L1, L2, L3, and L4 are connected and then to one end of the auxiliary spherical gap switch GP1 and the main spherical gap switch GP2.

[0023] Furthermore, the light-controlled trigger ignition circuit includes diodes D13 to D16, resistors R10 to R19, capacitors C5 to C9, an optical signal transceiver Q5, a thyristor Q6, and a thyristor Q7. One end of the resistor R10 is connected to the other end of the resistor R4, and the other end of the resistor R10 is connected to one end of the resistor R11 and the cathode of the diode D13. The anode of the diode D13 is connected to the cathode of the diode D14, and the anode of the diode D14 is connected to the cathode of the diode D15. The anode of the diode D15 is connected to the cathode of the diode D16. The anode of the diode D16 is connected to one end of the resistor R12, the resistor R13, the resistor R14, and one end of the capacitor C5. The other end of the resistor R11 is connected to one end of the resistor R15, the capacitor C7, one end of the capacitor C8, and the cathode of the thyristor Q7. The anodes are all connected, the other end of the resistor R13 is connected to one end of the optical signal transceiver Q5 and one end of the capacitor C6, the other end of the optical signal transceiver Q5 is connected to the other end of the capacitor C6 and then connected to the control electrode of the thyristor Q6, the other end of the resistor R14 is connected to the anode of the thyristor Q6, the cathode of the thyristor Q6 is connected to the control electrode of the thyristor Q7, one end of the capacitor C9, and one end of the resistor R19, the cathode of the thyristor Q7 is connected to the other end of the capacitor C9 and the other end of the resistor R19 and then connected to ground, the other ends of the capacitors C7 and C8 are connected to one end of the resistor R17, the other end of the resistor R17 is connected to one end of the resistor R18, the other ends of the resistors R12, R16, R18, and capacitor C5 are all connected and then connected to the positive electrode of the diode D4;

[0024] Furthermore, the coupling trigger circuit includes resistors R20 to R24, capacitors C10 to C13, and a pulse transformer T. Pin 1 of the pulse transformer T is connected to the cathode of the thyristor Q7, and pin 2 of the pulse transformer T is connected to the other end of the capacitor C8. Pin 3 of the pulse transformer T is connected to the capacitor C10, one end of the resistor R20, and the other end of the auxiliary ball gap switch GP1. Pin 4 of the pulse transformer T is connected to one end of the capacitor C13 and the resistor R24. The other end is connected to the other end of the resistor R20, one end of the resistor R21, and one end of the capacitor C11. The other end of the capacitor C11 is connected to the other end of the resistor R21, one end of the resistor R22, and one end of the capacitor C12. The other end of the capacitor C12 is connected to the other end of the resistor R22, one end of the resistor R23, the other end of the capacitor C13, the positive electrode of the diode D4, and the other end of the main ball gap switch GP2, and then grounded. The other end of the resistor R23 is connected to the other end of the resistor R24.

[0025] Furthermore, if any of the energy storage circuit and the capacitor C7 and the capacitor C8 is not fully charged, the light-controlled trigger ignition circuit does not trigger the ignition action;

[0026] When the energy storage circuit and the capacitors C7 and C8 are all in a fully charged state, the light-controlled trigger ignition circuit triggers the spherical gap switch to ignite according to the ignition trigger signal sent by the test control terminal.

[0027] The beneficial effect of the present invention is that the triggering energy of the ignition trigger device is provided by discharging the energy storage circuit, which can achieve a stable and reliable increase in the triggering energy, and the light-controlled charging circuit, light-controlled triggering ignition circuit, and light-controlled charging feedback circuit are arranged to work together with the test control end through optical fiber, which can ensure that the timing of the ball gap switch action is accurate, the operation is safe, and the triggering is reliable, thereby being able to extremely well meet the use requirements in the high-voltage test field and having good use value. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is the overall circuit principle diagram of the present invention;

[0029] Figure 2 It is a signal transmission relationship diagram of the test control terminal in the present invention;

[0030] Figure 3 This is a circuit diagram of the light-controlled charging circuit of the present invention;

[0031] Figure 4 This is a circuit diagram of the light-controlled charging feedback circuit of the present invention;

[0032] Figure 5This is a circuit schematic diagram of the light-controlled trigger ignition circuit of the present invention;

[0033] Figure 6 It is a diagram of the injection structure of the main ball gap switch GP2 in the present invention;

[0034] Figure 7 This is a diagram showing the injection effect of the main ball gap switch GP2 of the present invention. DETAILED DESCRIPTION

[0035] like Figures 1 to 7 As shown, a high-energy ignition trigger device for a ball gap switch of the present invention includes a light-controlled charging circuit, a DC boost module, a light-controlled trigger ignition circuit, a light-controlled charging feedback circuit, an energy storage circuit, and a ball gap switch. Optical fibers are used to transmit information between the light-controlled charging circuit, the light-controlled trigger ignition circuit, the light-controlled charging feedback circuit, and the test control terminal.

[0036] The light-controlled charging circuit is connected to the power supply and is used to perform charging according to the charging signal sent by the test control terminal;

[0037] The DC boost module is connected to the light-controlled charging circuit, the light-controlled trigger ignition circuit, and the energy storage circuit. It is used to increase the power supply voltage to the voltage required to drive the subsequent circuits. That is, it is used to charge capacitors C1 to C4, and capacitors C7 and C8 in the light-controlled trigger ignition circuit. At the same time, it provides power to the light-controlled trigger ignition circuit and the light-controlled charging feedback circuit.

[0038] The light-controlled charging feedback circuit is connected to the DC boost module and the energy storage circuit, and is used to feed back a full-charge signal to the test control terminal after the energy storage module is fully charged;

[0039] The light-controlled trigger ignition circuit is connected to the ball gap switch and is used to trigger the ignition action of the ball gap switch according to the ignition trigger signal sent by the test control terminal;

[0040] The energy storage circuit is connected to the ball gap switch and is used to release the charge after the light-controlled trigger ignition circuit is triggered, and discharge through the ball gap switch.

[0041] The device also includes a signal feedback circuit and a coupling trigger circuit; wherein,

[0042] The signal feedback circuit is connected to the DC boost module, the light-controlled charging feedback circuit, and the energy storage circuit, and is used to output a feedback signal to the light-controlled charging feedback circuit after the energy storage module is fully charged, and to release the charge of the energy storage circuit when the charging state stops;

[0043] The coupling trigger circuit is connected between the light-controlled trigger ignition circuit and the ball gap switch. After the light-controlled trigger ignition circuit receives the ignition trigger signal, the coupling trigger circuit performs voltage coupling on the discharge voltage output by the light-controlled trigger ignition circuit and outputs a high-voltage pulse to the ball gap switch, causing the ball gap of the ball gap switch to break down.

[0044] The power supply adopts a 24V DC power supply, and the voltage output range of the DC boost module is 24V to 850V. The DC boost module can adopt a power module such as the EMCO F40 series;

[0045] Capacitors C1 to C4 are all DC pulse capacitors with a rated capacity of 1000V / 200uF. The DC boost module charges capacitors C1 to C4 through diode D2, resistor R4, and resistor R8. The maximum charging voltage is 850V. After capacitors C1 to C4 are charged in parallel, a total energy storage of 289J is achieved.

[0046] Among them, the DC boost module charges capacitors C1 to C4 while also charging capacitors C7 and C8 in the light-controlled trigger ignition circuit through diode D2, resistor R4, resistor R10, and resistor R11. The parameters of capacitors C7 and C8 are 1250V / 1uF. When capacitors C1 to C4, capacitors C7, and capacitors C8 are fully charged, the branch voltage of diodes D13 to D16 and resistor R12 is 24V, and diodes D13 to D16 are 24V. Reference numeral 6 represents a TVS diode, which limits the voltage to 825V after being connected in series to ensure that the voltage of capacitor C5 connected in parallel with resistor R12 is approximately 24V. The voltage of capacitor C5 serves as the trigger signal power supply for thyristors Q6 and Q7. To ensure the stability and reliability of the trigger circuit and reduce the probability of false triggering, the light-controlled trigger ignition circuit adopts a dual-stage triggering of thyristors Q6 and Q7. At the same time, the light-controlled trigger ignition circuit will only work when capacitors C1 to C4, C7, and C8 are all fully charged.

[0047] The light-controlled charging circuit includes a resistor R1, a resistor R2, an optical signal transceiver Q1, a transistor Q2, and a first solid-state relay. The resistor R1, the coil K1-1 of the first solid-state relay, and one end of the normally open contact K1-2 of the first solid-state relay are connected and then connected to the positive pole of the power supply. The other end of the resistor R1 is connected to one end of the optical signal transceiver Q1, and the other end of the optical signal transceiver Q1 is connected to one end of the resistor R2 and the base of the transistor Q2. The other end of the coil K1-1 of the first solid-state relay is connected to the collector of the transistor Q2, and the other end of the resistor R2 is connected to the emitter of the transistor Q2 and then connected to the negative pole of the power supply. The other end of the normally open contact K1-2 of the first solid-state relay and the emitter of the transistor Q2 are both connected to the DC boost module.

[0048] The light-controlled charging feedback circuit includes a resistor R3, a MOS transistor Q3, an optical signal transceiver Q4, a diode D1, a varistor RV1, a varistor RV2, and a second solid-state relay. The cathode of the diode D1, one end of the varistor RV1, one end of the coil K2-1 of the second solid-state relay, and one end of the optical signal transceiver Q4 are all connected, and then connected to the other end of the normally open contact K1-2 of the first solid-state relay and the input terminal Vin of the DC boost module. The other end of the optical signal transceiver Q4 is connected to one end of the resistor R3, and the other end of the resistor R3 is connected to one end of the normally open contact K2-2 of the second solid-state relay. The other end of the normally open contact K2-2 of the second solid-state relay is connected to the anode of the diode D1, the other end of the varistor RV1, the other end of the coil K2-1 of the second solid-state relay, one end of the varistor RV2, and the drain of the MOS transistor Q3. The other end of the varistor RV2 is connected to the source of the MOS transistor Q3 and then grounded.

[0049] The signal feedback circuit includes a third solid-state relay, resistors R4 to R9, and diodes D2 to D8. One end of the coil K3-1 of the third solid-state relay is connected to the input end Vin of the DC boost module, and the other end of the coil K3-1 of the third solid-state relay is connected to the ground end of the DC boost module. The output end Vout of the DC boost module is connected to the positive electrode of the diode D2, and the negative electrode of the diode D2 is connected to one end of the resistor R4. The other end of the resistor R4 is connected to the resistor R5, one end of the resistor R8, and one end of the normally closed contact K3-2 of the third solid-state relay. The other end of the resistor R5 is connected to the negative electrode of the diode D5, and the positive electrode of the diode D5 is connected to the negative electrode of the diode D6. The diode D The anode of diode D6 is connected to the cathode of diode D7, the anode of diode D7 is connected to the cathode of diode D8, the anode of diode D8 is connected to the cathode of diode D3 and one end of resistor R6, the other end of resistor R6 is connected to the anode of diode D3, the cathode of diode D4, and one end of resistor R7, and then to the gate of MOS transistor Q3, the other end of the normally closed contact K3-2 of the third solid-state relay is connected to one end of the normally closed contact K3-3 of the third solid-state relay, the other end of the normally closed contact K3-3 of the third solid-state relay is connected to one end of resistor R9, and the other end of resistor R7 is connected to the anode of diode D4 and the other end of resistor R9, and then to the ground terminal of the DC boost module.

[0050] The energy storage circuit includes diodes D9~D12, inductors L1~L4, and capacitors C1~C4; the ball gap switch includes an auxiliary ball gap switch GP1 and a main ball gap switch GP2; one end of the capacitor C1 is connected to the positive electrode of the diode D9 and then connected to the ground terminal of the DC boost module, one end of the capacitor C2 is connected to the positive electrode of the diode D10 and then connected to the ground terminal of the DC boost module, one end of the capacitor C3 is connected to the positive electrode of the diode D11 and then connected to the ground terminal of the DC boost module, one end of the capacitor C4 is connected to the positive electrode of the diode D12 and then connected to the ground terminal of the DC boost module, and the capacitors C1 and C2 are connected to the positive electrode of the diode D10 and then connected to the ground terminal of the DC boost module. The other end of capacitor C1 is connected to the cathode of diode D9 and then to one end of inductor L1. The other end of capacitor C2 is connected to the cathode of diode D10 and then to one end of inductor L2. The other end of capacitor C3 is connected to the cathode of diode D11 and then to one end of inductor L3. The other end of capacitor C4 is connected to the cathode of diode D12 and then to one end of inductor L4 and the other end of resistor R8. The other ends of inductor L1, inductor L2, inductor L3, and inductor L4 are connected and then to one end of auxiliary spherical gap switch GP1 and main spherical gap switch GP2.

[0051] Among them, inductors L1~L4 are connected in series with capacitors C1~C4 respectively. Their function is to generate resonance when capacitors C1~C4 are connected in series with the inductors, thereby lengthening the short-circuit discharge time of the capacitors, that is, increasing the arc spray time between the gaps, which is more conducive to the penetration of the test circuit; at the same time, it can appropriately reduce the short-circuit discharge current peak of the energy storage capacitor and extend the service life of the spherical gap discharge gap.

[0052] The light-controlled trigger ignition circuit includes diodes D13 to D16, resistors R10 to R19, capacitors C5 to C9, an optical signal transceiver Q5, a thyristor Q6, and a thyristor Q7. One end of the resistor R10 is connected to the other end of the resistor R4, the other end of the resistor R10 is connected to one end of the resistor R11 and the cathode of the diode D13, the anode of the diode D13 is connected to the cathode of the diode D14, the anode of the diode D14 is connected to the cathode of the diode D15, the anode of the diode D15 is connected to the cathode of the diode D16, the anode of the diode D16 is connected to one end of the resistor R12, the resistor R13, the resistor R14, and one end of the capacitor C5, the other end of the resistor R11 is connected to one end of the resistor R15, the capacitor C7, one end of the capacitor C8, and the anode of the thyristor Q7. The other ends of resistor R13 are connected to one end of the optical signal transceiver Q5 and one end of the capacitor C6. The other end of the optical signal transceiver Q5 is connected to the other end of the capacitor C6 and then to the control electrode of the thyristor Q6. The other end of resistor R14 is connected to the anode of the thyristor Q6. The cathode of the thyristor Q6 is connected to the control electrode of the thyristor Q7, one end of the capacitor C9, and one end of the resistor R19. The cathode of the thyristor Q7 is connected to the other end of the capacitor C9 and the other end of the resistor R19 and then to ground. The other ends of the capacitors C7 and C8 are connected to one end of the resistor R17. The other end of the resistor R17 is connected to one end of the resistor R18. The other ends of the resistors R12, R16, R18, and capacitor C5 are all connected and then to the anode of the diode D4.

[0053] The coupling trigger circuit includes resistors R20~R24, capacitors C10~C13, and a pulse transformer T. Pin 1 of the pulse transformer T is connected to the cathode of the thyristor Q7, pin 2 of the pulse transformer T is connected to the other end of the capacitor C8, pin 3 of the pulse transformer T is connected to the capacitor C10, one end of the resistor R20, and the other end of the auxiliary ball gap switch GP1, pin 4 of the pulse transformer T is connected to the capacitor C13 and one end of the resistor R24, the other end of the capacitor C10 is connected to the other end of the resistor R20, one end of the resistor R21, and one end of the capacitor C11, the other end of the capacitor C11 is connected to the other end of the resistor R21, one end of the resistor R22, and one end of the capacitor C12, the other end of the capacitor C12 is connected to the other end of the resistor R22, one end of the resistor R23, the other end of the capacitor C13, the positive electrode of the diode D4, and the other end of the main ball gap switch GP2, and then grounded, and the other end of the resistor R23 is connected to the other end of the resistor R24.

[0054] If any of the energy storage circuit and capacitor C7 or capacitor C8 is not fully charged, the light-controlled trigger ignition circuit will not trigger the ignition action;

[0055] When the energy storage circuit and capacitors C7 and C8 are all in a fully charged state, the light-controlled trigger ignition circuit triggers the spherical gap switch to ignite according to the ignition trigger signal sent by the test control terminal.

[0056] The light-controlled charging circuit, light-controlled trigger ignition circuit, light-controlled charging feedback circuit, and test control terminal in the present invention use optical fiber to transmit information, solving the problem of potential isolation between the high-voltage operating conditions of the ignition trigger device and the test control terminal in the central control room, ensuring the safety of test personnel in the central control room. At the same time, it can reduce the electromagnetic field interference problem of the ignition trigger device in a complex environment with high voltage and high current, ensuring stable and reliable operation of the ignition trigger box.

[0057] The working process of the present invention is as follows: when the light-controlled charging circuit receives a charging start signal from the test control end through the optical signal transceiver Q1, the light-controlled charging circuit is turned on to start charging, and the DC boost module starts to charge the energy storage capacitor (i.e., composed of capacitors C1 to C4) in the energy storage module and the trigger capacitor (i.e., composed of capacitors C7 and C8) in the light-controlled trigger ignition circuit. After charging is completed, the light-controlled charging feedback circuit will send a full feedback signal to the test control end through the optical signal transceiver Q4, which is used for the test control end device status indication and safety interlock; subsequently, when performing a high-voltage test, the test control end sends an ignition trigger instruction, and the light-controlled trigger ignition circuit receives the instruction through the optical signal transceiver Q5, and then immediately triggers the light-controlled trigger ignition circuit to trigger the spherical gap switch to ignite. The spherical gap of the energy storage capacitor discharges at the arc outlet, forming an ionization channel between the spherical gaps of the main spherical gap switch GP2, thereby achieving the purpose of quickly turning on the voltage circuit;

[0058] Specifically:

[0059] In the light-controlled charging circuit, when the optical signal transceiver Q1 receives the optical signal sent by the test control terminal (i.e., charging starts), the optical signal transceiver Q1 is turned on, the transistor Q2 is turned on, the coil K1-1 of the first solid-state relay is attracted, and the normally open contact K1-2 of the first solid-state relay is closed, thereby connecting the circuit of the stage after the normally open contact K1-2 of the first solid-state relay and charging the subsequent circuit; when the test control terminal stops sending the "start charging" signal, the optical signal transceiver Q1 is turned off, and the normally open contact K1-2 of the first solid-state relay is also turned off, and the circuit of the stage after the normally open contact K1-2 of the first solid-state relay is powered off;

[0060] The coil K3-1 of the third solid-state relay is simultaneously energized after the normally open contact K1-2 of the first solid-state relay is closed. The normally closed contacts K3-2 and K3-3 of the third solid-state relay are disconnected, and the branch where the resistor R9 is located is disconnected. When the ignition trigger device is in the charging stop state (i.e., the normally open contact K1-2 of the first solid-state relay is disconnected), the normally closed contacts K3-2 and K3-3 of the third solid-state relay are closed, and the resistor R9 is connected in series with the capacitors C1 to C4 to discharge the charge on the capacitors C1 to C4.

[0061] When capacitors C1 to C4 are fully charged, that is, the capacitor voltage is 850V, the branch consisting of resistor R5, diodes D3 to D8, resistor R6, and resistor R7 in series provides a 24V voltage signal to the light-controlled charging feedback circuit. After receiving the signal, MOS tube Q3 in the light-controlled charging feedback circuit is turned on, the coil K2-1 of the second solid-state relay is attracted, and the normally open contact K2-2 of the second solid-state relay is closed. The optical signal transceiver Q4 sends an optical signal, which is sent to the test control end as a "full feedback" signal for device status indication and safety interlocking at the test control end.

[0062] Next, during the high-voltage test, when the optical signal transceiver Q5 in the light-controlled trigger ignition circuit receives the ignition trigger signal from the test control terminal, the optical signal transceiver Q5 turns on, triggering the thyristor Q6 to turn on. At the same time, the thyristor Q6 turns on, causing the thyristor Q7 to turn on. The fully charged capacitors C7 and C8 discharge to the primary side of the pulse transformer T through the thyristor Q7.

[0063] The pulse transformer T couples the primary voltage and induces a high-voltage pulse of approximately 30 kV on its secondary side. After voltage division through capacitors C10 to C13 and resistors R20 to R24, it outputs a high-voltage pulse of approximately 20 kV to the series circuit consisting of the auxiliary spherical gap switch GP1 and the discharge gap of the main spherical gap switch GP2. The approximately 20 kV high-voltage pulse can instantly penetrate the auxiliary spherical gap switch GP1, and after the auxiliary spherical gap switch GP1 penetrates the gap of the main spherical gap switch GP2, the gap is also broken down. At this time, capacitors C1 to C4 will short-circuit and discharge through the broken discharge gap of the main spherical gap switch GP2. The discharge energy is the amount of electricity stored in capacitors C1 to C4, which can reach up to 289 J.

[0064] In summary, the gap trigger energy in the present invention reaches 289J, the discharge ionization channel is as long as 15cm, and the trigger action time is stable within 5us. It can well meet the use requirements of ball gap switch devices in high-voltage test fields such as voltage source ignition ball gap switches, high-voltage closing device ignition triggering, and lightning impulse equipment in high-voltage synthetic test circuits.

[0065] Figure 6 In the figure, 1 is the arc injection port of the main ball gap switch GP2; 2 is the arc.

[0066] according to Figure 7 As shown, the arc is ejected through the arc ejection port 1. From left to right, the arc ejection moment of the main ball gap switch GP2 just after being broken down, and the effect after a period of ejection.

[0067] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0068] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A high-energy ignition trigger device for a ball gap switch, characterized by: It includes a light-controlled charging circuit, a DC boost module, a light-controlled trigger ignition circuit, a light-controlled charging feedback circuit, an energy storage circuit, and a ball gap switch. The light-controlled charging circuit, the light-controlled trigger ignition circuit, the light-controlled charging feedback circuit and the test control end all use optical fibers for information transmission; wherein, a light-controlled charging circuit, connected to a power supply, and configured to perform a charging operation according to a charging signal sent by the test control terminal; A DC boost module is connected to the light-controlled charging circuit, the light-controlled trigger ignition circuit, and the energy storage circuit, and is used to increase the power supply voltage to a voltage value required to drive subsequent circuits; A light-controlled charging feedback circuit is connected to the DC boost module and the energy storage circuit, and is used to feed back a full-charge signal to the test control terminal after the energy storage module is fully charged; A light-controlled trigger ignition circuit is connected to the ball gap switch and is used to trigger the ignition action of the ball gap switch according to the ignition trigger signal sent by the test control terminal; The energy storage circuit is connected to the ball gap switch and is used to release the charge after the light-controlled trigger ignition circuit is triggered, and discharge the charge through the ball gap switch.

2. A high-energy ignition trigger device for a ball gap switch according to claim 1, characterized in that: The device further includes a signal feedback circuit and a coupling trigger circuit; wherein, The signal feedback circuit is connected to the DC boost module, the light-controlled charging feedback circuit, and the energy storage circuit, and is used to output a feedback signal to the light-controlled charging feedback circuit after the energy storage module is fully charged, and to release the charge of the energy storage circuit when the charging state is stopped; The coupling trigger circuit is connected between the light-controlled trigger ignition circuit and the ball gap switch, and is used to voltage-couple the discharge voltage output by the light-controlled trigger ignition circuit after the light-controlled trigger ignition circuit receives the ignition trigger signal, and output a high-voltage pulse to the ball gap switch, so that the ball gap of the ball gap switch is broken down.

3. The high-energy ignition trigger device for a ball gap switch according to claim 1, characterized in that: The power supply adopts a 24V DC power supply, and the voltage output range of the DC boost module is 24V to 850V.

4. The high-energy ignition trigger device for a ball gap switch according to claim 2, characterized in that: The light-controlled charging circuit includes a resistor R1, a resistor R2, an optical signal transceiver Q1, a transistor Q2, and a first solid-state relay. The resistor R1, the coil K1-1 of the first solid-state relay, and one end of the normally open contact K1-2 of the first solid-state relay are connected and then connected to the positive electrode of the power supply. The other end of the resistor R1 is connected to one end of the optical signal transceiver Q1, and the other end of the optical signal transceiver Q1 is connected to one end of the resistor R2 and the base of the transistor Q2. The other end of the coil K1-1 of the first solid-state relay is connected to the collector of the transistor Q2, and the other end of the resistor R2 is connected to the emitter of the transistor Q2 and then connected to the negative electrode of the power supply. The other end of the normally open contact K1-2 of the first solid-state relay and the emitter of the transistor Q2 are both connected to the DC boost module.

5. The high-energy ignition trigger device for a ball gap switch according to claim 4, characterized in that: The light-controlled charging feedback circuit includes a resistor R3, a MOS transistor Q3, an optical signal transceiver Q4, a diode D1, a varistor RV1, a varistor RV2, and a second solid-state relay. The cathode of the diode D1, one end of the varistor RV1, one end of the coil K2-1 of the second solid-state relay, and one end of the optical signal transceiver Q4 are all connected, and then connected to the other end of the normally open contact K1-2 of the first solid-state relay and the input end Vin of the DC boost module. The other end of the optical signal transceiver Q4 is connected to one end of the resistor R3, and the other end of the resistor R3 is connected to one end of the normally open contact K2-2 of the second solid-state relay. The other end of the normally open contact K2-2 of the second solid-state relay is connected to the anode of the diode D1, the other end of the varistor RV1, the other end of the coil K2-1 of the second solid-state relay, one end of the varistor RV2, and the drain of the MOS transistor Q3. The other end of the varistor RV2 is connected to the source of the MOS transistor Q3 and then grounded.

6. The high-energy ignition trigger device for a ball gap switch according to claim 5, characterized in that: The signal feedback circuit includes a third solid-state relay, resistors R4 to R9, and diodes D2 to D8. One end of the coil K3-1 of the third solid-state relay is connected to the input end Vin of the DC boost module, and the other end of the coil K3-1 of the third solid-state relay is connected to the ground end of the DC boost module. The output end Vout of the DC boost module is connected to the positive electrode of the diode D2, and the negative electrode of the diode D2 is connected to one end of the resistor R4. The other end of the resistor R4 is connected to the resistor R5, one end of the resistor R8, and one end of the normally closed contact K3-2 of the third solid-state relay. The other end of the resistor R5 is connected to the negative electrode of the diode D5, and the positive electrode of the diode D5 is connected to the negative electrode of the diode D6. The anode of D6 is connected to the cathode of the diode D7, the anode of the diode D7 is connected to the cathode of the diode D8, the anode of the diode D8 is connected to the cathode of the diode D3 and one end of the resistor R6, the other end of the resistor R6 is connected to the anode of the diode D3, the cathode of the diode D4, and one end of the resistor R7, and then connected to the gate of the MOS transistor Q3, the other end of the normally closed contact K3-2 of the third solid-state relay is connected to one end of the normally closed contact K3-3 of the third solid-state relay, the other end of the normally closed contact K3-3 of the third solid-state relay is connected to one end of the resistor R9, and the other end of the resistor R7 is connected to the anode of the diode D4 and the other end of the resistor R9, and then connected to the ground end of the DC boost module.

7. The high-energy ignition trigger device for a ball gap switch according to claim 6, characterized in that: The energy storage circuit includes diodes D9~D12, inductors L1~L4, and capacitors C1~C4; the spherical gap switch includes an auxiliary spherical gap switch GP1 and a main spherical gap switch GP2; one end of the capacitor C1 is connected to the positive electrode of the diode D9 and then connected to the ground end of the DC boost module, one end of the capacitor C2 is connected to the positive electrode of the diode D10 and then connected to the ground end of the DC boost module, one end of the capacitor C3 is connected to the positive electrode of the diode D11 and then connected to the ground end of the DC boost module, one end of the capacitor C4 is connected to the positive electrode of the diode D12 and then connected to the ground end of the DC boost module, The other end of the capacitor C1 is connected to the cathode of the diode D9 and then to one end of the inductor L1. The other end of the capacitor C2 is connected to the cathode of the diode D10 and then to one end of the inductor L2. The other end of the capacitor C3 is connected to the cathode of the diode D11 and then to one end of the inductor L3. The other end of the capacitor C4 is connected to the cathode of the diode D12 and then to one end of the inductor L4 and the other end of the resistor R8. The other ends of the inductor L1, inductor L2, inductor L3, and inductor L4 are connected and then to one end of the auxiliary spherical gap switch GP1 and the main spherical gap switch GP2.

8. The high-energy ignition trigger device for a ball gap switch according to claim 6, characterized in that: The light-controlled trigger ignition circuit includes diodes D13 to D16, resistors R10 to R19, capacitors C5 to C9, an optical signal transceiver Q5, a thyristor Q6, and a thyristor Q7. One end of the resistor R10 is connected to the other end of the resistor R4, and the other end of the resistor R10 is connected to one end of the resistor R11 and the cathode of the diode D13. The anode of the diode D13 is connected to the cathode of the diode D14, and the anode of the diode D14 is connected to the cathode of the diode D15. The anode of the diode D15 is connected to the cathode of the diode D16. The anode of the diode D16 is connected to one end of the resistor R12, the resistor R13, the resistor R14, and one end of the capacitor C5. The other end of the resistor R11 is connected to one end of the resistor R15, the capacitor C7, one end of the capacitor C8, and the anode of the thyristor Q7. The other end of the resistor R13 is connected to one end of the optical signal transceiver Q5 and one end of the capacitor C6. The other end of the optical signal transceiver Q5 is connected to the other end of the capacitor C6 and then connected to the control electrode of the thyristor Q6. The other end of the resistor R14 is connected to the anode of the thyristor Q6. The cathode of the thyristor Q6 is connected to the control electrode of the thyristor Q7, one end of the capacitor C9, and one end of the resistor R19. The cathode of the thyristor Q7 is connected to the other end of the capacitor C9 and the other end of the resistor R19 and then grounded. The other ends of the capacitors C7 and C8 are connected to one end of the resistor R17. The other end of the resistor R17 is connected to one end of the resistor R18. The other ends of the resistors R12, R16, R18, and capacitor C5 are all connected and then connected to the positive electrode of the diode D4.

9. The high-energy ignition trigger device for a ball gap switch according to claim 8, characterized in that: The coupling trigger circuit includes resistors R20 to R24, capacitors C10 to C13, and a pulse transformer T. Pin 1 of the pulse transformer T is connected to the cathode of the thyristor Q7, pin 2 of the pulse transformer T is connected to the other end of the capacitor C8, pin 3 of the pulse transformer T is connected to the capacitor C10, one end of the resistor R20, and the other end of the auxiliary ball gap switch GP1, pin 4 of the pulse transformer T is connected to one end of the capacitor C13 and the resistor R24, and the other end of the capacitor C10 is connected to the cathode of the thyristor Q7. It is connected to the other end of the resistor R20, one end of the resistor R21, and one end of the capacitor C11. The other end of the capacitor C11 is connected to the other end of the resistor R21, one end of the resistor R22, and one end of the capacitor C12. The other end of the capacitor C12 is connected to the other end of the resistor R22, one end of the resistor R23, the other end of the capacitor C13, the positive electrode of the diode D4, and the other end of the main ball gap switch GP2, and then grounded. The other end of the resistor R23 is connected to the other end of the resistor R24.

10. The high-energy ignition trigger device for a ball gap switch according to claim 8, characterized in that: If any of the energy storage circuit and the capacitor C7 and the capacitor C8 is not fully charged, the light-controlled trigger ignition circuit does not trigger the ignition action; When the energy storage circuit and the capacitors C7 and C8 are all in a fully charged state, the light-controlled trigger ignition circuit triggers the spherical gap switch to ignite according to the ignition trigger signal sent by the test control terminal.

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