All-solid-state pulse-modulated high-voltage switch

Abstract

The application discloses a kind of full solid-state pulse modulation high-voltage switches, including drive modulation power supply, and be connected on drive modulation power supply Soft-start delay module, comprehensive fault detection module and fault self-checking module;The scheme is based on dry type full solid-state modulation switch to improve structure, the running state of each group of full solid-state switch device can be conveniently observed in use process, when part of full solid-state switch device in overvoltage modulation high-voltage switch is damaged, it is not necessary to disconnect the connection of full solid-state switch, each is measured;And add self-checking function in full solid-state modulation switch, whether modulation switch can reach working condition can be effectively judged before each experiment. Improve the convenience of use efficiency and detection, maintenance etc..

Description

Technical Field

[0001] The present invention relates to the technical field of power electronics, and in particular to an all-solid-state pulse modulation high-voltage switch. Background Art

[0002] With the commissioning of the China Tokamak Experimental Reactor (HL-2M) tokamak, the auxiliary heating system within the new device has placed higher demands on the high-voltage power supply. The auxiliary heating system of the new device has a higher output power and higher plasma operating parameters. As a key subsystem of the auxiliary heating system, the high-voltage power supply must not only output long pulse rated power, but also have self-test capabilities for its own parameter performance and be able to reset itself after a fault occurs. Summary of the Invention

[0003] The technical problem to be solved by the present invention is that the existing high-voltage power supply has operational and running inconveniences when used in the auxiliary heating system of a tokamak device. The present invention aims to provide an all-solid-state pulse-modulated high-voltage switch. This switch is structurally improved based on a dry-type all-solid-state modulation switch. During use, the operating status of each group of all-solid-state switch components can be easily observed. When some of the all-solid-state switch components in the overvoltage modulation high-voltage switch are damaged, it is no longer necessary to disconnect the all-solid-state switches and perform measurements on each. A self-test function is also added to the all-solid-state modulation switch to effectively determine whether the modulation switch can reach the working state before each experiment. This improves the efficiency of use and the convenience of detection and maintenance.

[0004] The present invention is achieved through the following technical solutions:

[0005] This solution provides an all-solid-state pulse modulation high-voltage switch, including a drive modulation power supply, and a soft start delay module, a comprehensive fault detection module and a fault self-test module connected to the drive modulation power supply;

[0006] The soft start delay module is used to delay the start of the driving modulated power supply when the driving modulated power supply is connected to the power grid;

[0007] The comprehensive fault detection module is used to detect overvoltage faults, overcurrent faults and undervoltage faults after the detection drive modulation power supply is started, and perform protection reset after the fault is eliminated;

[0008] The fault self-detection module is used to perform overcurrent fault self-detection after detecting that the drive modulation power supply is started.

[0009] Working Principle of This Solution: Existing high-voltage power supplies used in the auxiliary heating system of a tokamak device present operational and operational inconveniences. This invention aims to provide an all-solid-state pulse-modulated high-voltage switch. This structural improvement, based on a dry-type all-solid-state modulating switch, allows for convenient observation of the operating status of each group of all-solid-state switch components during use. When some of the all-solid-state switch components in an overvoltage modulating high-voltage switch are damaged, it is no longer necessary to disconnect the all-solid-state switches and perform measurements on each. A self-test function is also incorporated into the all-solid-state modulating switch to effectively determine whether the modulating switch is operational before each experiment. This improves operational efficiency and facilitates inspection and maintenance.

[0010] The rated parameters of this modulator high-voltage switch are 20kV / 50A, with a maximum output modulation frequency of 5kHz, a maximum operating pulse width of 10s, and an interval of 300s. The power supply drives the modulated power supply via optical fiber triggering, turning on and off the IGBT in the solid-state switch, controlling the output voltage on and off. Both the turn-on and turn-off time delays are in the microsecond range. The system features self-detection overcurrent fault memory, output overcurrent protection fault memory, output spark fault memory, and fault clearing. It also provides IGBT overcurrent and short-circuit protection, which is provided by tripping the circuit breaker. It also features self-detection overcurrent protection, which performs a self-detection when the solid-state high-voltage switch is not operating. When the self-detection current exceeds the normal value, the power supply protects and latches the fault, preventing the power supply from outputting trigger pulse signals. After the self-detection overcurrent, the power supply will no longer provide trigger pulse signals.

[0011] A further optimized solution is that the driving modulation power supply includes:

[0012] The high-voltage input terminal is connected to the two input terminals of the bridge rectifier Q1, the capacitor C1 is connected in parallel to the two output terminals of the bridge rectifier Q1, and the series branch formed by the connection between the resistor R1 and the positive electrode of the light-emitting diode D1 is connected in parallel to the two ends of the capacitor C1; the base of the field-effect transistor W1 is connected to the resistor R3, the collector of the field-effect transistor W1 is connected to the resistor R1, and the emitter of the field-effect transistor W1 is connected to the negative electrode of the light-emitting diode D1;

[0013] The switch drive line terminals are connected to the two input terminals of the bridge rectifier Q2, the capacitor C2 is connected in parallel to the two output terminals of the bridge rectifier Q2, and the series branch formed by the connection of the resistor R2 and the positive electrode of the light-emitting diode D2 is connected in parallel to the two ends of the capacitor C2; the base of the field-effect transistor W2 is connected to the resistor R4, the collector of the field-effect transistor W1 is connected to the resistor R2, the emitter of the field-effect transistor W2 is connected in series with the resistor R5 and then connected to the cathode of the light-emitting diode D2; the emitter of the field-effect transistor W2 is connected to the collector of the field-effect transistor W1.

[0014] The drive modulation power supply for the all-solid-state high-voltage switch includes a high-voltage input terminal and a switch drive line terminal. The high-voltage input terminal has two connections: the upper connection port provides input when the high-voltage input is positive, and the lower connection port provides output. When the high-voltage input is negative, the lower connection port provides input and the upper connection port provides output. The all-solid-state high-voltage switch drive line passes through a polytetrafluoroethylene tube, with the upper lead connected to the positive terminal of the drive modulation power supply and the lower lead connected to the ground terminal of the drive modulation power supply.

[0015] A further optimization solution is that the soft start delay module includes:

[0016] The positive electrode of the driving modulated power supply output is connected to the delay resistor R6 and then connected to the positive input terminal of the voltage comparator V1. One end of the delay capacitor C3 is connected to the positive input terminal of the voltage comparator V1, and the other end is grounded; one end of the discharge capacitor C4 is connected to the positive input terminal of the voltage comparator V1, and the other end is grounded;

[0017] The negative electrode of the drive modulation power supply is connected to the output end of the voltage comparator V1; the output end of the voltage comparator V1 is connected in series with the resistor R7 and then connected to the base of the transistor S, the collector of the transistor S is connected to the relay K1 and then the output is connected to the drive modulation power supply, and the rectifier diode D3 is connected in parallel on both sides of the relay K1.

[0018] A further optimized solution is that the comprehensive fault detection module includes an overvoltage fault unit, an overcurrent fault unit and an undervoltage fault unit; the overvoltage fault unit, the overcurrent fault unit and the undervoltage fault unit are respectively connected to the total fault output port;

[0019] The positive pole of the driving modulated power supply output is connected to a potentiometer, one end of the potentiometer is grounded and the other end is connected to the positive input terminal of the voltage comparator V2. The output terminal of the voltage comparator V2 is connected in series with resistors R8 and R9 and then grounded; the negative pole of the driving modulated power supply output is connected to the negative input terminal of the voltage comparator V2; the output terminal of the voltage comparator V2 is connected to the light-emitting diode D4 and then to the total fault output port; the overvoltage fault output port is connected between resistors R8 and R9 (the overcurrent fault unit and undervoltage fault unit are the same as the overvoltage fault unit, except that when the overcurrent fault output port is connected between resistors R8 and R9, an overcurrent fault unit is formed, and when the undervoltage fault output port is connected between resistors R8 and R9, an undervoltage fault unit is formed).

[0020] A further optimized solution is that the fault self-check module includes:

[0021] The self-test current sampling is connected to the positive input terminal of the voltage comparator V5 after passing through the amplification circuit. The negative input terminal of the voltage comparator V5 is grounded. The potentiometer is connected to the negative terminal of the voltage comparator V5. The output terminal of the voltage comparator V5 is connected in series with the resistor R10 and then connected to the self-test overcurrent fault port; the output terminal of the voltage comparator V5 is connected in series with the resistor R11 and then connected to the self-test overcurrent indication port.

[0022] A further optimized solution is to further include a shut-off pulse light input terminal and an on-pulse light input terminal; the on-pulse light input terminal is connected to a resistor R3, and the shut-off pulse light input terminal is connected to a resistor R4.

[0023] A further optimization solution is that the time constant of the soft start delay module is jointly determined by the delay resistor R6 and the delay capacitor C3.

[0024] A further optimized solution is to further include a self-reset circuit, which is connected to the total fault output port.

[0025] A further optimization scheme is that the self-reset circuit is used to count the total number of faults at the fault output end within the time period t. If the number of faults within the time period t is 0, the self-reset circuit starts the protection reset, otherwise the self-reset circuit does not start the protection reset.

[0026] A further optimization solution is to drive the modulated power supply to output 220V AC power supply.

[0027] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0028] The present invention provides an all-solid-state pulse-modulated high-voltage switch. Based on a dry-type all-solid-state modulating switch, the device features structural improvements that allow convenient observation of the operating status of each set of all-solid-state switch components during use. When some of the all-solid-state switch components in an overvoltage modulating high-voltage switch are damaged, it is no longer necessary to disconnect the all-solid-state switches before performing measurements. Furthermore, a self-test function is incorporated into the all-solid-state modulating switch to effectively determine whether the modulating switch is operational before each experiment. This improves operational efficiency and facilitates inspection and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following briefly introduces the drawings required for use in the examples. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be considered as limiting the scope. A person of ordinary skill in the art can also derive other relevant drawings based on these drawings without inventive effort. In the drawings:

[0030] Figure 1 Schematic diagram of the drive modulation power supply structure;

[0031] Figure 2 This is a structural diagram of the soft start delay module;

[0032] Figure 3 It is a structural diagram of the comprehensive fault detection module;

[0033] Figure 4 This is a structural diagram of the fault self-check module.

[0034] Markings and corresponding parts names in the accompanying drawings:

[0035] 1- High voltage input terminal, 2- Switch drive line terminal, 3- External circuit, 4- Outgoing line interface, 5- Incoming line interface, 6- Self-reset circuit, 7- Amplifier circuit, 8- Potentiometer. DETAILED DESCRIPTION

[0036] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with examples and drawings. The exemplary embodiments of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0037] Example 1

[0038] This embodiment provides an all-solid-state pulse modulation high-voltage switch, comprising a drive modulation power supply, and a soft start delay module, a comprehensive fault detection module, and a fault self-detection module connected to the drive modulation power supply;

[0039] The soft start delay module is used to delay the start of the driving modulated power supply when the driving modulated power supply is connected to the power grid;

[0040] The comprehensive fault detection module is used to detect overvoltage faults, overcurrent faults and undervoltage faults after the detection drive modulation power supply is started, and perform protection reset after the fault is eliminated;

[0041] The fault self-detection module is used to perform overcurrent fault self-detection after detecting that the drive modulation power supply is started.

[0042] like Figure 1 As shown, the driving modulation power supply includes:

[0043] High-voltage input terminal 1 is connected to the two input terminals of the bridge rectifier Q1, capacitor C1 is connected in parallel to the two output terminals of the bridge rectifier Q1, and a series branch formed by connecting resistor R1 and the positive electrode of the light-emitting diode D1 is connected in parallel to both ends of capacitor C1; the base of the field-effect transistor W1 is connected to resistor R3, the collector of the field-effect transistor W1 is connected to resistor R1, and the emitter of the field-effect transistor W1 is connected to the negative electrode of the light-emitting diode D1;

[0044] Terminal 2 of the switch drive line is connected to the two input terminals of the bridge rectifier Q2, capacitor C2 is connected in parallel to the two output terminals of the bridge rectifier Q2, and a series branch formed by connecting resistor R2 and the positive electrode of the light-emitting diode D2 is connected in parallel to the two ends of capacitor C2; the base of the field-effect transistor W2 is connected to resistor R4, the collector of the field-effect transistor W1 is connected to resistor R2, the emitter of the field-effect transistor W2 is connected in series with resistor R5 and then connected to the cathode of the light-emitting diode D2; the emitter of the field-effect transistor W2 is connected to the collector of the field-effect transistor W1.

[0045] The input and output wiring locations of the drive modulation power supply are on the rear panel of the power supply. There are three fiber optic interfaces on the panel. The "fiber optic reset" interface is used to receive the reset signal of the host computer, the "trigger signal" interface is used to receive the drive trigger signal of the host computer, and the "fault" interface is used to send fault signals to the host computer.

[0046] The driving modulation power supply further includes an external circuit 3, and the soft start delay module, the comprehensive fault detection module and the fault self-detection module are all connected to the external circuit 3;

[0047] It also includes a shut-off pulse light input terminal and an on-pulse light input terminal; the on-pulse light input terminal is connected to a resistor R3, and the shut-off pulse light input terminal is connected to a resistor R4.

[0048] like Figure 2 As shown, the soft start delay module includes:

[0049] The positive electrode output from the driving modulated power supply passes through the incoming line interface 5, is connected to the delay resistor R6, and then connected to the positive input terminal of the voltage comparator V1. One end of the delay capacitor C3 is connected to the positive input terminal of the voltage comparator V1, and the other end is grounded; one end of the discharge capacitor C4 is connected to the positive input terminal of the voltage comparator V1, and the other end is grounded;

[0050] The negative pole of the driving modulation power supply is connected to the output end of the voltage comparator V1; the output end of the voltage comparator V1 is connected in series with the resistor R7 and then connected to the base of the transistor S, the collector of the transistor S is connected to the relay K1 and then the output is connected to the driving modulation power supply, the rectifier diode D3 is connected in parallel on both sides of the relay K1, and the relay K1 is connected to the output interface 4.

[0051] High-voltage input terminal 1 receives input voltage, which is converted into a DC voltage through a rectifier circuit. The rectifier circuit includes a bridge rectifier circuit and a soft-start circuit. The soft-start circuit reduces the impact on the power grid when the power is connected. Light-emitting diode D3 indicates the power-on state. The output voltage is turned on and off by controlling the regulated voltage at the gate of input field-effect transistor W1. Ultimately, the high voltage is output through external circuit 3, resulting in a highly precise and stable output.

[0052] Soft start delay module access Figure 1The start-up pulse light input terminal of the delay start enable voltage is connected to the delay circuit. The values ​​of the delay resistor R6 and the delay capacitor C3 jointly determine the time constant. The discharge capacitor C4 can discharge the delay capacitor C3. The voltage comparator V1 controls the output by comparing the enable voltage with the set voltage. When the set voltage is less than the enable voltage, the output is high, otherwise it is turned off. The output voltage is connected to the relay K1 through the amplification effect of the transistor S and the rectifier diode D3, and finally output through the output interface 4. The output interface 4 is connected to Figure 1 Connect both ends of capacitor C1.

[0053] The comprehensive fault detection module includes an overvoltage fault unit, an overcurrent fault unit and an undervoltage fault unit; the overvoltage fault unit, the overcurrent fault unit and the undervoltage fault unit are respectively connected to the total fault output port;

[0054] like Figure 3 As shown, the positive electrode of the drive modulated power output is connected to a potentiometer, one end of which is grounded and the other end is connected to the positive input of a voltage comparator V2. The output of the voltage comparator V2 is connected in series with resistors R8 and R9 and then to ground. The negative electrode of the drive modulated power output is connected to the negative input of the voltage comparator V2. The output of the voltage comparator V2 is connected to a light-emitting diode D4 and then to a total fault output port. The overvoltage fault output port is connected between resistors R8 and R9 (the overcurrent fault unit and undervoltage fault unit are the same as the overvoltage fault unit, except that the overcurrent fault output port is connected between resistors R8 and R9, forming an overcurrent fault unit, and the undervoltage fault output port is connected between resistors R8 and R9, forming an undervoltage fault unit). A self-reset circuit 6 is also included, which is connected to the total fault output port.

[0055] The comprehensive fault detection module (including the self-reset circuit) is connected to external circuit 3 of the all-solid-state high-voltage switch drive modulated power supply. Within the comprehensive fault detection module, voltage comparator V2 compares the potentiometer's set voltage with the current and voltage sampled values. When the sampled value exceeds the set value, light-emitting diode D4 illuminates as a fault indicator. When light is on, it indicates the presence of the corresponding fault. All faults have a latching function. The fault signal latching time is determined by the internal circuitry of the self-reset circuit. The fault signal passes through self-reset circuit 6 and is output to voltage comparator V2. The zero voltage output by self-reset circuit 6 causes voltage comparator V2 to output a low level, thereby restoring the high level during an overcurrent fault. After reset, the fault is cleared.

[0056] like Figure 4 As shown, the fault self-check module includes:

[0057] The self-test current sampling is connected to the positive input terminal of the voltage comparator V5 after passing through the amplifier circuit 7. The negative input terminal of the voltage comparator V5 is grounded. The potentiometer 8 is connected to the negative terminal of the voltage comparator V5. The output terminal of the voltage comparator V5 is connected in series with the resistor R10 and then connected to the self-test overcurrent fault port; the output terminal of the voltage comparator V5 is connected in series with the resistor R11 and then connected to the self-test overcurrent indication port.

[0058] The fault self-detection module is connected to the external circuit 3 of the all-solid-state high-voltage switch drive modulation power supply. After the self-detection current sampling value passes through the amplification circuit 7, it is compared with the self-detection current reference value set by the potentiometer 8 through the voltage comparator V5. When the sampling value is greater than the reference value, the corresponding fault result is output at the output end of the voltage comparator.

[0059] The time constant of the soft start delay module is determined by the delay resistor R6 and the delay capacitor C3.

[0060] The self-reset circuit is used to count the number of faults at the total fault output terminal within a time period t. If the number of faults within the time period t is 0, the self-reset circuit starts a protection reset; otherwise, the self-reset circuit does not start a protection reset.

[0061] A power supply interface is set to drive the modulated power supply to output 220V AC power supply.

[0062] Example 2

[0063] Based on the previous embodiment, this embodiment sets a self-test high-voltage output interface, which is connected to the negative power input contact (the self-test high voltage is -5KV) through an inverted silicon stack, and then connected back to the power ground interface from the modulated load ground end.

[0064] In this embodiment, three BNC interfaces are set in the middle of the all-solid-state pulse modulation high-voltage switch panel, "output ignition sampling" is the ignition current sampling interface, "output current sampling" is the average current sampling interface, and "output voltage sampling" is the output voltage sampling interface.

[0065] An all-solid-state high-voltage switch drive output interface is set up. This interface is the positive end of the drive modulation power supply. The interface is connected to the power supply "ground" interface after passing through the modulation switch drive ring through a high-voltage line.

[0066] The all-solid-state pulse modulation high-voltage switch outdoor power supply in this embodiment has a complete indication and control system, and the power display digital meter, indicator light, and control switch are all fixed on the front panel.

[0067] Use the output current or threshold value table to indicate the current when the all-solid-state high-voltage switch is working, and indicate the average current protection threshold of the all-solid-state high-voltage switch;

[0068] Use the detection current or threshold value table to indicate the power supply self-detection current value and the self-detection current protection threshold;

[0069] The power indicator light is used to indicate whether the power is supplied. When the power is on, the indicator light is on.

[0070] Use the trigger operation indicator light to indicate whether the power supply sends a trigger pulse signal. The light is on when the power supply sends a trigger pulse signal.

[0071] The output overcurrent indicator light indicates whether the power supply has output current overcurrent or output sparking. The light will be on when the power supply has overcurrent or sparking.

[0072] The overcurrent detection indicator light is used to indicate whether the power supply has detected overcurrent. When the power supply has detected overcurrent, the light is on.

[0073] Use the undervoltage indicator to indicate whether the power supply is undervoltage. The light will be on when the power supply is undervoltage. The power supply is usually undervoltage. When the power supply starts the self-test command, the undervoltage indicator will automatically go out when the self-test starts.

[0074] The power supply has an easy-to-operate control design, where the output current threshold knob is used to adjust the output average current protection threshold, and turning the knob clockwise increases the current.

[0075] The detection current threshold knob is used to adjust the detection current protection threshold. Turning the knob clockwise increases the current protection threshold.

[0076] The power switch button is a self-locking switch used to control the power supply. Press the switch and the power switch indicator light will turn on.

[0077] The detection power switch is a self-locking switch used to control the self-test power enable. Pressing the switch turns on the self-test power enable switch indicator, which then sends an enable signal to the self-test power supply through the microcontroller. When the detection power switch is turned on, the power supply will perform a self-test after a delay of several seconds after power-on. The self-test will be performed again after each triggering operation.

[0078] The reset switch button is a self-resetting switch, which is used to reset the power failure signal of this control. When the power failure is latched, press the reset switch to reset the fault signal.

[0079] The reset selector switch is a self-locking toggle switch used to select the power reset method. Upward for automatic reset, downward for manual reset. In the automatic reset mode, if a power failure occurs, the system will automatically reset after a few milliseconds or seconds. In the case of an average current failure, the system will automatically reset after a few seconds. In the case of a spark failure, the system will automatically reset after a few milliseconds. For a manual reset, press the reset button or use the reset fiber optic cable.

[0080] The output display selection switch is a self-locking button switch used to select whether the digital meter displays the output current or the output current overcurrent threshold.

[0081] The detection display selection switch is a self-locking button switch, which is used to select whether the digital meter displays the detection current or the detection current overcurrent threshold.

[0082] The trigger detection interface is a trigger signal synchronous output port, which can be used to detect whether a trigger signal is generated.

[0083] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An all-solid-state pulse modulated high-voltage switch, characterized in that: It includes a driving modulation power supply, and a soft start delay module, a comprehensive fault detection module and a fault self-detection module connected to the driving modulation power supply; The soft start delay module is used to delay the start of the driving modulated power supply when the driving modulated power supply is connected to the power grid; The comprehensive fault detection module is used to detect overvoltage faults, overcurrent faults and undervoltage faults after the detection drive modulation power supply is started, and perform protection reset after the fault is eliminated; The fault self-detection module is used to perform overcurrent fault self-detection after the detection drive modulation power supply is started; The drive modulation power supply comprises: The high-voltage input terminal is connected to the two input terminals of the bridge rectifier Q1, the capacitor C1 is connected in parallel to the two output terminals of the bridge rectifier Q1, and the series branch formed by the connection of the resistor R1 and the positive electrode of the light-emitting diode D1 is connected in parallel to the two ends of the capacitor C1; the base of the field-effect transistor W1 is connected to the resistor R3, the collector of the field-effect transistor W1 is connected to the resistor R1, and the emitter of the field-effect transistor W1 is connected to the cathode of the light-emitting diode D1; The switch drive line terminals are connected to the two input terminals of the bridge rectifier Q2, the capacitor C2 is connected in parallel to the two output terminals of the bridge rectifier Q2, and the series branch formed by the connection of the resistor R2 and the positive electrode of the light-emitting diode D2 is connected in parallel to the two ends of the capacitor C2; the base of the field-effect transistor W2 is connected to the resistor R4, the collector of the field-effect transistor W1 is connected to the resistor R2, the emitter of the field-effect transistor W2 is connected in series with the resistor R5, and then connected to the cathode of the light-emitting diode D2; the collector of the field-effect transistor W2 is connected to the emitter of the field-effect transistor W1; The soft start delay module includes: The positive electrode of the driving modulated power supply output is connected to the delay resistor R6 and then connected to the positive input terminal of the voltage comparator V1. One end of the delay capacitor C3 is connected to the positive input terminal of the voltage comparator V1, and the other end is grounded; one end of the discharge capacitor C4 is connected to the positive input terminal of the voltage comparator V1, and the other end is grounded; The negative electrode of the drive modulation power supply is connected to the output end of the voltage comparator V1; the output end of the voltage comparator V1 is connected in series with the resistor R7 and then connected to the base of the transistor S, the collector of the transistor S is connected to the relay K1 and then the output is connected to the drive modulation power supply, and the rectifier diode D3 is connected in parallel on both sides of the relay K1.

2. The all-solid-state pulse modulation high-voltage switch according to claim 1, characterized in that: The comprehensive fault detection module includes an overvoltage fault unit, an overcurrent fault unit and an undervoltage fault unit; the overvoltage fault unit, the overcurrent fault unit and the undervoltage fault unit are respectively connected to the total fault output port; The positive pole of the driving modulated power supply output is connected to a potentiometer, one end of the potentiometer is grounded and the other end is connected to the positive input terminal of the voltage comparator V2. The output terminal of the voltage comparator V2 is connected in series with resistors R8 and R9 and then grounded; the negative pole of the driving modulated power supply output is connected to the negative input terminal of the voltage comparator V2; the output terminal of the voltage comparator V2 is connected to the light-emitting diode D4 and then to the total fault output port; the overvoltage fault output port is connected between resistors R8 and R9.

3. The all-solid-state pulse modulation high-voltage switch according to claim 1, characterized in that: The fault self-check module includes: The self-test current sampling is connected to the positive input terminal of the voltage comparator V5 after passing through the amplification circuit. The negative input terminal of the voltage comparator V5 is grounded. The potentiometer is connected to the negative terminal of the voltage comparator V5. The output terminal of the voltage comparator V5 is connected in series with the resistor R10 and then connected to the self-test overcurrent fault port; the output terminal of the voltage comparator V5 is connected in series with the resistor R11 and then connected to the self-test overcurrent indication port.

4. The all-solid-state pulse modulation high-voltage switch according to claim 1, characterized in that: It also includes a shut-off pulse light input terminal and an on-pulse light input terminal; the on-pulse light input terminal is connected to a resistor R3, and the shut-off pulse light input terminal is connected to a resistor R4.

5. The all-solid-state pulse modulation high-voltage switch according to claim 1, characterized in that: The time constant of the soft start delay module is determined by the delay resistor R6 and the delay capacitor C3.

6. The all-solid-state pulse modulation high-voltage switch according to claim 2, characterized in that: It also includes a self-reset circuit, which is connected to the total fault output port.

7. The all-solid-state pulse modulation high-voltage switch according to claim 6, characterized in that: The self-reset circuit is used to count the number of faults at the total fault output terminal within a time period t. If the number of faults within the time period t is 0, the self-reset circuit starts a protection reset; otherwise, the self-reset circuit does not start a protection reset.

8. The all-solid-state pulse modulation high-voltage switch according to claim 1, characterized in that: The drive modulation power supply outputs 220V AC power supply.

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