100kV-level repetition-frequency high-voltage pulse trigger with isolation protection and isolation protection method thereof

Abstract

The invention particularly relates to a 100kV-level repetition-frequency high-voltage pulse trigger with isolation protection and an isolation protection method thereof, and solves the technical problem that an existing repetition-frequency high-voltage nanosecond pulse trigger is difficult to realize safety isolation protection and electromagnetic compatibility of a primary winding. The 100kV-level repetition-frequency high-voltage pulse trigger with the isolation protection comprises a repetition-frequency high-voltage nanosecond pulse trigger circuit, a first current-limiting isolation circuit, a filter circuit, a directional circuit, a shunt voltage release circuit and a second current-limiting isolation circuit, and solves the problems of safety isolation protection and electromagnetic compatibility of a primary winding of the high-voltage nanosecond pulse trigger. The isolation protection method of the 100kV-level repetition-frequency high-voltage pulse trigger with the isolation protection function is safe and reliable, and the service life of the repetition-frequency high-voltage nanosecond pulse trigger can be greatly prolonged.

Description

Technical Field

[0001] The invention specifically relates to a 100kV-level repetitive-frequency high-voltage pulse trigger with isolation protection and an isolation protection method thereof. Background Art

[0002] High-frequency high-voltage nanosecond pulse triggers are widely used in accelerator physics, high-power microwaves, pulse power technology, high-energy laser technology and other fields. High-frequency high-voltage nanosecond pulse triggers output voltage pulses with an amplitude of up to 100kV and a leading edge time of ns, which are usually used to trigger high-voltage gas switches to force them to turn on; after the high-voltage gas switch is triggered and turned on, the energy storage capacitor in its main circuit will be quickly discharged through the high-voltage gas switch. When the discharge of the main circuit of the high-voltage gas switch is abnormal, a transient overvoltage of 100 to 200 kV may be formed on the trigger electrode of the high-voltage gas switch. The overvoltage is reversely applied to the circuit of the heavy-frequency high-voltage nanosecond pulse trigger through the trigger electrode, causing the circuit devices along the heavy-frequency high-voltage nanosecond pulse trigger circuit to be subjected to severe transient overvoltage and overcurrent shocks, and simultaneously forming electromagnetic conduction interference that affects the normal operation of the heavy-frequency high-voltage nanosecond pulse trigger. In severe cases, it may cause serious accidents such as overvoltage breakdown, overcurrent burning, false start-up, and circuit short circuit of the power semiconductor devices of the heavy-frequency high-voltage nanosecond pulse trigger, resulting in greatly reduced safety, reliability and service life of the heavy-frequency high-voltage nanosecond pulse trigger.

[0003] The repetitive high-voltage nanosecond pulse trigger of the saturable pulse transformer is a kind of pulse booster that uses the non-saturated state of the magnetic core of the saturable pulse transformer, and uses the secondary winding of the saturable pulse transformer as a magnetic switch after the magnetic core is saturated, and quickly releases the energy stored in the secondary high-voltage capacitor to the trigger electrode of the high-voltage gas switch in the form of ns pulses. Although the saturable pulse transformer is used to isolate the high-voltage circuit from the low-voltage circuit, due to the uncertainty and non-persistence of the saturation maintenance state of the magnetic core of the saturable pulse transformer, the 200kV transient overvoltage on the trigger electrode of the high-voltage gas switch under abnormal working conditions will still be reversely coupled and transmitted to the primary winding through the secondary high-voltage circuit of the saturable pulse transformer, causing the semiconductor switch of the primary circuit of the repetitive high-voltage nanosecond pulse trigger to be over-voltage-breakdown, over-current-short-circuit, and false triggering, and even causing the external DC power supply of the front stage of the repetitive high-voltage nanosecond pulse trigger to lose power, be powered off, and be damaged. Usually, an isolation inductor or a current-limiting resistor is connected in series at the high-voltage output end of the repetitive high-voltage nanosecond pulse trigger to weaken the reverse coupling damage of the transient overvoltage on the trigger electrode of the high-voltage gas switch, but the effect is very limited. Connecting filter capacitors in parallel at both ends of the high-voltage output of the repetitive high-voltage nanosecond pulse trigger can filter out the transient overvoltage pulses of the reverse-coupled gas switch trigger electrode. However, in order to achieve significant results, the filter capacitor value must be as high as nF to μF, which will seriously lower the normal output trigger pulse voltage level of the repetitive high-voltage nanosecond pulse trigger. Therefore, the parallel filter capacitor solution is not applicable.

[0004] The isolation protection method of the repetitive high-voltage nanosecond pulse trigger based on the saturable pulse transformer must be a combined isolation protection scheme that comprehensively considers various protection factors. However, there are no public research reports on related isolation protection schemes. Therefore, it is of great practical significance and application value to explore a repetitive high-voltage nanosecond pulse trigger isolation protection method to solve the problem of safe isolation protection and electromagnetic compatibility of the primary winding of the repetitive high-voltage nanosecond pulse trigger. Summary of the invention

[0005] The purpose of the present invention is to solve the technical problem that the existing repetitive high-voltage nanosecond pulse trigger is difficult to achieve safe isolation protection and electromagnetic compatibility of the primary winding, and to provide a 100kV repetitive high-voltage pulse trigger with isolation protection and an isolation protection method thereof.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A 100kV high-frequency high-voltage pulse trigger with isolation protection, which is special in that it includes a high-frequency high-voltage nanosecond pulse trigger circuit, a first current limiting isolation circuit, a filter circuit, a directional circuit, a shunt pressure relief circuit and a second current limiting isolation circuit;

[0008] The repetitive high-voltage nanosecond pulse trigger circuit includes a primary capacitor Cp, a primary trigger switch S, a saturable pulse transformer SPT, a secondary capacitor Cs and a secondary grounding inductor Lgs;

[0009] The filter circuit is connected between the positive and negative electrodes of the external DC power supply;

[0010] One end of the first current limiting isolation circuit is connected to one end of the primary capacitor Cp and one end of the primary trigger switch S, and the other end of the first current limiting isolation circuit is connected to the positive electrode of the external DC power supply;

[0011] The two ends of the shunt voltage relief circuit are respectively connected to the high voltage end and the low voltage end of the primary winding of the saturable pulse transformer SPT;

[0012] One end of the directional circuit is connected to the other end of the primary capacitor Cp, and the other end of the directional circuit is connected to the high voltage end of the primary winding of the saturable pulse transformer SPT;

[0013] The low voltage end of the primary winding of the saturable pulse transformer SPT and the other end of the primary trigger switch S are both connected to the negative electrode of the external DC power supply; the control end of the primary trigger switch S is connected to the external trigger signal;

[0014] One end of the secondary capacitor Cs is connected to the high voltage end of the secondary winding of the saturable pulse transformer SPT, and the other end is connected to one end of the second current limiting isolation circuit and one end of the secondary grounding inductor Lgs;

[0015] The other end of the secondary grounding inductor Lgs and the low voltage end of the secondary winding of the saturable pulse transformer SPT are connected to the output ground;

[0016] The other end of the second current limiting isolation circuit is connected to the load as an output high voltage end.

[0017] Furthermore, the boost ratio of the magnetic core of the saturable pulse transformer SPT in the non-saturated state is 1:n, where n is greater than 1; the value of the primary capacitor Cp is greater than or equal to 1.5n 2 times the value of the secondary capacitance Cs.

[0018] Furthermore, the first current limiting isolation circuit includes a current limiting resistor R0, an isolation inductor L0 and an anti-backcurrent isolation diode D0 connected in sequence; one end of the current limiting resistor R0 is connected to the positive electrode of the external DC power supply; the cathode of the anti-backcurrent isolation diode D0 is connected to one end connected to the primary capacitor Cp and the primary trigger switch S.

[0019] Furthermore, the shunt voltage relief circuit includes a diode D p1 With the current limiting resistor R ip ; diode D p1 The anode is connected to the high voltage end of the primary winding of the saturable pulse transformer SPT, and the cathode is connected to the current limiting resistor R ipOne end is connected to the current limiting resistor R ip The other end is connected to the low voltage end of the primary winding of the saturable pulse transformer SPT.

[0020] Furthermore, the directional circuit includes a forward diode D p2 , reverse diode D p3 And isolation inductor L ip ; Forward diode D p2 The cathode and isolation inductor L ip One end connected to forward diode D p2 Anode, reverse diode D p3 The cathode of the diode is connected to the other end of the primary capacitor Cp; p3 Anode, isolation inductor L ip The other ends are connected to the high voltage end of the primary winding of the saturable pulse transformer SPT.

[0021] Furthermore, the filter circuit includes a filter capacitor C g0 、Filter capacitor C g1 And filter capacitor C g2 ; Filter capacitor C g0 One end, filter capacitor C g1 One end is connected to the positive pole of the external DC power supply, and the filter capacitor C g0 The other end is connected to the negative pole of the external DC power supply; the filter capacitor C g2 One end is connected to the negative pole of the external DC power supply, and the other end is connected to the filter capacitor C g1 and grounded.

[0022] Furthermore, the second current limiting isolation circuit includes a current limiting resistor Rsi and an isolation inductor Lsi connected in sequence; one end of the current limiting resistor Rsi is connected to the other end of the secondary capacitor Cs; and one end of the isolation inductor Lsi is connected to the load as an output high voltage end.

[0023] Furthermore, n=48; the turn-on and turn-off time of the anti-backflow isolation diode D0 is less than or equal to 100ns; the diode D p1 The turn-on and turn-off times of diode D are both less than or equal to 100ns. p1 The current through the forward diode D is greater than or equal to 2kA; p2 , reverse diode D p3 The turn-on and turn-off times are both less than or equal to 100ns, and the forward diode D p2 , reverse diode D p3 The through-current of the current limiting resistor Rsi and the isolation inductor Lsi are both greater than or equal to 50kV / 1μs.

[0024] At the same time, the present invention also provides an isolation protection method for the above-mentioned 100kV-level repetitive high-voltage pulse trigger with isolation protection, which is special in that it includes the following steps:

[0025] 1] The external DC power supply charges the primary capacitor Cp through the first current limiting isolation circuit;

[0026] 2] The external trigger signal controls the discharge of the primary capacitor Cp, and the core of the saturable pulse transformer SPT is in an unsaturated state. Its secondary winding boosts the voltage to charge the secondary capacitor Cs. When the secondary capacitor Cs reaches a peak value, the core of the saturable pulse transformer SPT is saturated and its secondary winding is turned on. At this time, the secondary capacitor Cs discharges through the secondary winding to generate a high-voltage trigger pulse, which is applied to the load trigger electrode through the second current limiting isolation circuit to achieve re-frequency triggering and conduction of the trigger electrode; the high-voltage pulse generated during the load operation is limited and isolated by the second current limiting isolation circuit, and then applied to the secondary of the saturable pulse transformer SPT, and then coupled and transmitted to the primary of the saturable pulse transformer SPT, and then protected by the shunt pressure relief circuit and the directional circuit.

[0027] Furthermore, the boost ratio of the magnetic core of the saturable pulse transformer SPT in the non-saturated state is 1:n, where n is greater than 1; the value of the primary capacitor Cp is greater than or equal to 1.5n 2 times the value of the secondary capacitance Cs.

[0028] Beneficial effects of the present invention:

[0029] 1. The present invention discloses a 100kV high-frequency high-voltage pulse trigger with isolation protection, which solves the problems of safety isolation protection and electromagnetic compatibility of the primary winding of the high-voltage nanosecond pulse trigger, realizes the safe, reliable and stable operation of the 100kV high-frequency high-voltage pulse trigger, and significantly improves the continuous trouble-free operation life of the high-frequency high-voltage nanosecond pulse trigger and the safety and reliability of its front-stage power supply.

[0030] 2. The present invention provides a 100kV high-frequency high-voltage pulse trigger with isolation protection, which connects a current-limiting resistor Rsi and an isolation inductor Lsi in series, and a forward diode D in series at the high-voltage end of the primary winding. p2 , reverse diode D p3 And isolation inductor L ip The high-voltage and low-voltage ends of the primary winding of the saturable pulse transformer SPT are connected in parallel with a shunt pressure relief circuit, the positive end of the trigger input power supply bus is connected in series with a current limiting resistor R0, an isolation inductor L0 and an anti-backflow isolation diode D0, and the negative end of the trigger input power supply bus is connected in parallel with a filter capacitor, which can make the high-frequency high-voltage nanosecond pulse trigger operate safely and reliably with more than 100,000 pulses under various working conditions.

[0031] 3. The isolation protection method of a 100kV-level repetitive high-voltage pulse trigger with isolation protection provided by the present invention is safe and reliable and can greatly improve the working life of the repetitive high-voltage nanosecond pulse trigger. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of an embodiment of a 100kV-class repetitive-frequency high-voltage pulse trigger with isolation protection of the present invention. DETAILED DESCRIPTION

[0033] like Figure 1 As shown, a 100kV high-frequency high-voltage pulse trigger with isolation protection includes a high-frequency high-voltage nanosecond pulse trigger circuit, a first current limiting isolation circuit, a filtering circuit, a directional circuit, a shunt pressure relief circuit and a second current limiting isolation circuit; the high-frequency high-voltage nanosecond pulse trigger circuit includes a primary capacitor Cp, a primary trigger switch S, a saturable pulse transformer SPT, a secondary capacitor Cs and a secondary grounding inductor Lgs; the first current limiting isolation circuit includes a current limiting resistor R0, an isolation inductor L0 and an anti-backflow isolation diode D0 connected in sequence; the shunt pressure relief circuit includes a diode D p1 With the current limiting resistor R ip ; The directional circuit includes a forward diode D p2 , reverse diode D p3 And isolation inductor L ip ; The filter circuit includes a filter capacitor C g0 、Filter capacitor C g1 And filter capacitor C g2 ; The second current limiting isolation circuit includes a current limiting resistor Rsi and an isolation inductor Lsi connected in sequence.

[0034] One end of the current limiting resistor R0 is connected to the positive electrode of the external DC power supply; the cathode of the anti-backflow isolation diode D0 is connected to the end connected to the primary capacitor Cp and the primary trigger switch S. p1 The anode is connected to the high voltage end of the primary winding of the saturable pulse transformer SPT, and the cathode is connected to the current limiting resistor R ip One end is connected to the current limiting resistor R ip The other end is connected to the low voltage end of the primary winding of the saturable pulse transformer SPT. p2 The cathode and isolation inductor L ip One end connected to forward diode D p2 Anode, reverse diode D p3 The cathode of the diode is connected to the other end of the primary capacitor Cp; p3 Anode, isolation inductor L ip The other end is connected to the high voltage end of the primary winding of the saturable pulse transformer SPT. g0 One end, filter capacitor C g1One end is connected to the positive pole of the external DC power supply, and the filter capacitor C g0 The other end is connected to the negative pole of the external DC power supply; the filter capacitor C g2 One end is connected to the negative pole of the external DC power supply, and the other end is connected to the filter capacitor C g1 The other end of the current limiting resistor Rsi is connected to the other end of the secondary capacitor Cs; one end of the isolation inductor Lsi is connected to the load as the output high voltage end.

[0035] In this embodiment, the boost ratio of the magnetic core of the saturable pulse transformer SPT in the non-saturated state is 1:n, n is 48, and the value of the primary capacitor Cp is greater than or equal to 1.5n 2 The turn-on and turn-off time of the anti-reverse current isolation diode D0 is less than or equal to 100ns; the diode D p1 The turn-on and turn-off times of diode D are both less than or equal to 100ns. p1 The current through the forward diode D is greater than or equal to 2kA; p2 , reverse diode D p3 The turn-on and turn-off times are both less than or equal to 100ns, and the forward diode D p2 , reverse diode D p3 The through-current of the current limiting resistor Rsi and the isolation inductor Lsi are both greater than or equal to 50kV / 1μs.

[0036] The isolation protection method of the present invention based on the above-mentioned 100kV-level repetitive high-voltage pulse trigger with isolation protection specifically comprises the following steps:

[0037] 1] The external DC power supply charges the primary capacitor Cp through the first current limiting isolation circuit;

[0038] 2] The external trigger signal controls the discharge of the primary capacitor Cp, and the core of the saturable pulse transformer SPT is in an unsaturated state. Its secondary winding boosts the voltage to charge the secondary capacitor Cs. When the secondary capacitor Cs reaches a peak value, the core of the saturable pulse transformer SPT is saturated and its secondary winding is turned on. At this time, the secondary capacitor Cs discharges through the secondary winding to generate a high-voltage trigger pulse, which is applied to the load trigger electrode through the second current limiting isolation circuit to achieve re-frequency triggering and conduction of the trigger electrode; the high-voltage pulse generated during the load operation is limited and isolated by the second current limiting isolation circuit, and then applied to the secondary of the saturable pulse transformer SPT, and then coupled and transmitted to the primary of the saturable pulse transformer SPT, and then protected by the shunt pressure relief circuit and the directional circuit.

[0039] This embodiment is based on the existing 100kV high-frequency high-voltage pulse trigger based on the saturable pulse transformer, and its high-frequency high-voltage nanosecond pulse trigger circuit is composed of the attached Figure 1The primary capacitor Cp, the primary trigger switch S, the saturable pulse transformer SPT, the secondary capacitor Cs, and the secondary grounding inductor Lgs are formed; wherein Cp=15μF, Cs=3nF, and Lgs=100μH; the isolation protection treatment is performed according to the method of the present invention, specifically as follows:

[0040] (1) A current limiting resistor R0, an isolation inductor L0, and an anti-backflow isolation diode D0 are connected in series between the positive end of the trigger input power supply bus and the positive electrode of the external DC power supply;

[0041] Between the positive terminals A7 and A1 of the trigger input bus, a current limiting resistor R0, an isolation inductor L0, and an anti-backflow isolation diode D0 are connected in series in sequence; wherein, the isolation inductor L0 ≥ 10μH, L0 = 30μH, and the turn-on and turn-off time of the anti-backflow isolation diode D0 is less than or equal to 100ns; when the maximum repetitive operating frequency of the trigger is f0 = 50Hz, then R0 ≤ 1 / (2f0C p ), R0 = 200Ω;

[0042] (2) A shunt voltage relief circuit is connected in parallel at both ends of the primary winding of the saturable pulse transformer SPT;

[0043] The diode D p1 With the current limiting resistor R ip After the series connection, the whole is connected in parallel between A5 and A6 at both ends of the primary winding of the saturable pulse transformer SPT, and the diode D p1 The forward direction of diode D is from A5 to A6. p1 The turn-on and turn-off times of diode D are both less than or equal to 100ns. p1 The through-current is greater than or equal to 2kA, R ip =0.3Ω;

[0044] (3) The primary winding is connected in series with an isolation inductor L ip and directional diodes;

[0045] The primary capacitor C p A reverse diode D is connected in series between the negative electrode and the primary input terminal A5 of the saturable pulse transformer SPT. p3 , reverse diode D p3 The positive direction is from A5 end to the primary capacitor C p Negative pole; in the primary capacitor C p A forward diode D is connected in series between the negative electrode and the primary input terminal A5 of the saturable pulse transformer SPT. p2 and isolation inductor L ip , where the forward diode D p2 The positive direction is the primary capacitor C p The negative pole points to the A5 terminal, L ip =15μH; forward diode D p2 and isolation inductor Lip After connecting in series, with the reverse diode D p3 It is a parallel relationship; forward diode D p2 , reverse diode D p3 The turn-on and turn-off times are both less than or equal to 100ns, and the forward diode D p2 , reverse diode D p3 The through-current is greater than or equal to 2kA;

[0046] (4) A filter capacitor is connected in parallel with the positive and negative ends of the trigger input power supply bus;

[0047] The lower limit of the cut-off frequency of the transient interference pulse coupled from the trigger A1 and A2 terminals to the external DC power supply output terminal A7 is defined as fc = 10kHz (the frequency component of the transient interference pulse with a frequency f ≥ fc is filtered out);

[0048] If the negative terminal A2 of the trigger input bus is directly grounded, a filter capacitor C is connected in parallel between the positive input terminal A7 and the A2 terminal of the trigger input bus. g0 , C g0 ≥1 / (2πR0f c );

[0049] If the negative terminal A2 of the trigger input bus is floating, in addition to connecting a filter capacitor C in parallel between A7 and A2, g0 In addition, A7 is connected to the ground in parallel with the filter capacitor C g0 , A7 is connected to ground in parallel with filter capacitor C g1 , A2 is connected to ground in parallel with filter capacitor C g2 ; Filter capacitor C g1 ≥1 / (2πR0f c ), filter capacitor C g2 ≥1 / (2πR0f c );C g0 =330nF, C g1 =330nF, C g2 =330nF.

[0050] (5) A current limiting resistor Rsi and an isolation inductor Lsi are connected in series at the high voltage output end;

[0051] Between the high-voltage output terminal A3 of the secondary capacitor Cs and the trigger load input terminal A4, a current limiting resistor Rsi and an isolation inductor Lsi are connected in series, and their functions are to limit current interference pulses and isolate high-voltage interference pulses respectively; wherein Rsi=1kΩ, Lsi=100μH, and the withstand voltage of the current limiting resistor Rsi and the isolation inductor Lsi are both greater than or equal to 50kV / 1μs; in other embodiments, the first current limiting isolation circuit (i.e., the current limiting resistor Rsi and the isolation inductor Lsi) can be multiple, which can simultaneously trigger and isolate the trigger electrodes of multiple loads.

[0052] (6) using an external DC power supply to charge the primary capacitor Cp through a first current limiting isolation circuit;

[0053] (7) 1] The external DC power supply charges the primary capacitor Cp through the first current limiting isolation circuit;

[0054] 2] The external trigger signal controls the discharge of the primary capacitor Cp, and the core of the saturable pulse transformer SPT is in an unsaturated state. Its secondary winding boosts the voltage to charge the secondary capacitor Cs. When the secondary capacitor Cs reaches a peak value, the core of the saturable pulse transformer SPT is saturated and its secondary winding is turned on. At this time, the secondary capacitor Cs discharges through the secondary winding to generate a high-voltage trigger pulse, which is applied to the load trigger electrode through the second current limiting isolation circuit to achieve the triggering conduction of the trigger electrode at a re-frequency. The high-voltage pulse generated during the load operation is limited and isolated by the second current limiting isolation circuit, and then applied to the secondary of the saturable pulse transformer SPT, and then coupled and transmitted to the primary of the saturable pulse transformer SPT, and then protected by the shunt pressure relief circuit and the directional circuit. At the same time, the primary capacitor Cp is discharged with a high residual voltage and a large current to force the core to maintain saturation.

[0055] In this embodiment, the step-up ratio of the saturable pulse transformer SPT core in the non-saturated state is 1:48; the primary capacitor Cp>2n 2 Cs provides a strong primary winding residual voltage current and core saturation maintaining magnetic field for the saturable pulse transformer SPT core saturation stage.

[0056] The existing 100kV repetitive high-voltage pulse trigger based on a saturable pulse transformer was powered on for testing. The output trigger pulse amplitude was 100kV and the pulse front was 200ns. The trigger pulse was applied to the gas switch trigger electrode load to achieve 50Hz repetitive triggering of the gas switch trigger electrode. During operation, 180kV and 10μs high-voltage pulses were applied to both ends of the trigger high-voltage output, and coupled and conducted from the secondary high-voltage circuit of the trigger to the primary winding, which severely impacted the trigger. However, the trigger operated continuously, safely and stably for more than 100,000 pulses under this condition, and the state was normal. The test results show that the method of the present invention solves the problem of safety isolation protection and electromagnetic compatibility of the primary winding of the high-voltage nanosecond pulse trigger.

Claims

1. A 100kV high-frequency high-voltage pulse trigger with isolation protection, characterized in that: It includes a repetitive high-voltage nanosecond pulse trigger circuit, a first current limiting isolation circuit, a filter circuit, a directional circuit, a shunt pressure relief circuit and a second current limiting isolation circuit; The repetitive high-voltage nanosecond pulse trigger circuit comprises a primary capacitor Cp, a primary trigger switch S, a saturable pulse transformer SPT, a secondary capacitor Cs and a secondary grounding inductor Lgs; The filter circuit is connected between the positive electrode and the negative electrode of the external DC power supply; One end of the first current limiting isolation circuit is connected to one end of the primary capacitor Cp and one end of the primary trigger switch S, and the other end of the first current limiting isolation circuit is connected to the positive electrode of the external DC power supply; The two ends of the shunt pressure relief circuit are respectively connected to the high-voltage end and the low-voltage end of the primary winding of the saturable pulse transformer SPT; One end of the directional circuit is connected to the other end of the primary capacitor Cp, and the other end of the directional circuit is connected to the high voltage end of the primary winding of the saturable pulse transformer SPT; The low-voltage end of the primary winding of the saturable pulse transformer SPT and the other end of the primary trigger switch S are both connected to the negative electrode of the external DC power supply; the control end of the primary trigger switch S is connected to the external trigger signal; One end of the secondary capacitor Cs is connected to the high voltage end of the secondary winding of the saturable pulse transformer SPT, and the other end is connected to one end of the second current limiting isolation circuit and one end of the secondary grounding inductor Lgs; The other end of the secondary grounding inductor Lgs and the low-voltage end of the secondary winding of the saturable pulse transformer SPT are both connected to the output ground; The other end of the second current limiting isolation circuit is connected to the load as an output high voltage end.

2. According to the 100kV high-frequency high-voltage pulse trigger with isolation protection in claim 1, it is characterized in that: The boost ratio of the magnetic core of the saturable pulse transformer SPT in the non-saturated state is 1:n, and n is greater than 1; The value of the primary capacitor Cp is greater than or equal to 1.5n 2 times the value of the secondary capacitance Cs.

3. The 100kV high-frequency high-voltage pulse trigger with isolation protection according to claim 2 is characterized in that: The first current limiting isolation circuit comprises a current limiting resistor R0, an isolation inductor L0 and an anti-backflow isolation diode D0 connected in sequence; One end of the current limiting resistor R0 is connected to the positive electrode of the external DC power supply; The cathode of the anti-backflow isolation diode D0 is connected to one end of the primary capacitor Cp and the primary trigger switch S.

4. The 100kV high-frequency high-voltage pulse trigger with isolation protection according to claim 3 is characterized in that: The shunt voltage relief circuit includes a diode D p1 With the current limiting resistor R ip ; The diode D p1 The anode is connected to the high voltage end of the primary winding of the saturable pulse transformer SPT, and the cathode is connected to the current limiting resistor R ip One end connected; The current limiting resistor R ip The other end is connected to the low voltage end of the primary winding of the saturable pulse transformer SPT.

5. The 100kV high-frequency high-voltage pulse trigger with isolation protection according to claim 4 is characterized in that: The directional circuit includes a forward diode D p2 , reverse diode D p3 And isolation inductor L ip ; The forward diode D p2 The cathode and isolation inductor L ip One end connected; The forward diode D p2 Anode, reverse diode D p3 The cathodes are connected to the other end of the primary capacitor Cp; The reverse diode D p3 Anode, isolation inductor L ip The other ends are connected to the high voltage end of the primary winding of the saturable pulse transformer SPT.

6. The 100 kV high-frequency high-voltage pulse trigger with isolation protection according to claim 5, characterized in that: The filter circuit includes a filter capacitor C g0 、Filter capacitor C g1 And filter capacitor C g2 ; The filter capacitor C g0 One end, filter capacitor C g1 One end is connected to the positive pole of the external DC power supply, and the filter capacitor C g0 The other end is connected to the negative pole of the external DC power supply; The filter capacitor C g2 One end is connected to the negative pole of the external DC power supply, and the other end is connected to the filter capacitor C g1 and grounded.

7. The 100 kV high-frequency high-voltage pulse trigger with isolation protection according to claim 8 is characterized in that: The second current limiting isolation circuit comprises a current limiting resistor Rsi and an isolation inductor Lsi connected in sequence; One end of the current limiting resistor Rsi is connected to the other end of the secondary capacitor Cs; One end of the isolation inductor Lsi is connected to the load as an output high voltage end.

8. The 100 kV high-frequency high-voltage pulse trigger with isolation protection according to claim 7, characterized in that: n=48; The turn-on and turn-off time of the anti-backflow isolation diode D0 is less than or equal to 100ns; The diode D p1 The turn-on and turn-off times of diode D are both less than or equal to 100ns. p1 The through-current is greater than or equal to 2kA; The forward diode D p2 , reverse diode D p3 The turn-on and turn-off times are both less than or equal to 100ns, and the forward diode D p2 , reverse diode D p3 The through-current is greater than or equal to 2kA; The withstand voltage of the current limiting resistor Rsi and the isolation inductor Lsi are both greater than or equal to 50 kV / 1 μs.

9. An isolation protection method for a 100 kV high-frequency high-voltage pulse trigger with isolation protection as claimed in any one of claims 1 to 8, characterized in that: The following steps are involved: 1] The external DC power supply charges the primary capacitor Cp through the first current limiting isolation circuit; 2] The external trigger signal controls the discharge of the primary capacitor Cp, the magnetic core of the saturable pulse transformer SPT is in an unsaturated state, and its secondary winding boosts the voltage to charge the secondary capacitor Cs. When the secondary capacitor Cs reaches a peak value, the magnetic core of the saturable pulse transformer SPT is saturated, and its secondary winding is turned on. At this time, the secondary capacitor Cs discharges through the secondary winding to generate a high-voltage trigger pulse, which is applied to the load trigger electrode through the second current limiting isolation circuit to achieve the trigger electrode re-frequency triggering conduction; The high-voltage pulse generated during the load operation is limited and isolated by the second current limiting isolation circuit, applied to the secondary of the saturable pulse transformer SPT, and then coupled and transmitted to the primary of the saturable pulse transformer SPT, and then protected by the shunt pressure relief circuit and the directional circuit.

10. The isolation protection method of a 100 kV high-frequency high-voltage pulse trigger with isolation protection according to claim 9, characterized in that: The boost ratio of the magnetic core of the saturable pulse transformer SPT in the non-saturated state is 1:n, and n is greater than 1; The value of the primary capacitor Cp is greater than or equal to 1.5n 2 times the value of the secondary capacitance Cs.

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