A high voltage solid-state modulator pulse synchronization isolation circuit

Abstract

The utility model discloses a high-voltage solid-state modulator pulse synchronization isolation circuit; it comprises a high-voltage solid-state modulator pulse synchronization isolation circuit, a modulation switch component and a fractional ratio pulse transformer, the modulation switch component is electrically connected to the fractional ratio pulse transformer, the high-voltage solid-state modulator pulse synchronization isolation circuit is electrically connected between the modulation switch component and a high-voltage power supply / charging power supply DC 1kV-1.4kV, the high-voltage solid-state modulator pulse synchronization isolation circuit is composed of AC / DC isolation step-down, auxiliary power supply voltage stabilization, photoelectric conversion, isolation drive, an electronic switch module S1 and a power supply indication circuit, the utility model supplies power to the photoelectric conversion and isolation drive through the AC / DC isolation step-down and auxiliary power supply voltage stabilization conversion voltage, and then controls the electronic switch module S1 to be turned on or off through the isolation drive, and only needs AC220V power supply and ST optical fiber connector input to realize the pulse synchronization isolation function; the pulse synchronization isolation circuit can be suspended at a high potential for use.

Description

Technical Field

[0001] The utility model belongs to the technical field of high-voltage solid-state modulators, and in particular relates to a pulse synchronous isolation circuit of a high-voltage solid-state modulator. Background Art

[0002] High-voltage solid-state modulators are widely used in large scientific facilities such as accelerators, industrial irradiation, and advanced light sources. Their function is to convert the input kV-level DC voltage into a pulsed high-voltage output of several hundred kV to provide high-voltage pulse energy for electron tubes. However, various high-voltage solid-state modulators on the market still have various problems.

[0003] The high voltage solid-state modulator is mainly composed of a high voltage power supply, n modulation switch components and a fractional ratio pulse transformer. The circuit diagram is as follows: Figure 6 As shown;

[0004] P1 is a high voltage power supply: it is also called a "charging power supply" in some books, and its rated output voltage range is usually DC1kV~1.4kV;

[0005] K1~Kn are n modulation switch components: n is usually between tens and hundreds;

[0006] R1~Rn are charging resistors of each modulation switch component;

[0007] T1 is a fractional ratio pulse transformer: the transformation ratio is usually one to several hundred.

[0008] Working principle of high-voltage solid-state modulator: The DC voltage output by the high-voltage power supply P1 charges the capacitors C1, C2...Cn through the charging resistors R1, R2...Rn respectively. After being fully charged, the IGBT tubes V1, V2...Vn are turned on for several us (usually <10us) at the same time. The capacitors C1, C2...Cn discharge to the n primary stages of the fractional ratio pulse transformer through the IGBT tubes V1, V2...Vn respectively. After the fractional ratio pulse transformer is boosted, the secondary stage outputs a pulsed negative high voltage of several hundred kV. After the pulse ends, the high-voltage power supply P1 replenishes the discharged electricity to the capacitors C1, C2...Cn. This is one cycle.

[0009] These high voltage solid state modulators feature:

[0010] Narrow pulse width: usually <10us;

[0011] Low pulse repetition frequency: usually <50Hz;

[0012] The peak power is relatively high: between tens of megawatts and hundreds of megawatts;

[0013] The average power is not very high: between a few kilowatts and tens of kilowatts.

[0014] The disadvantages or shortcomings of this type of high-voltage solid-state modulator are that the charging resistors R1, R2...Rn are connected in parallel with the high-voltage power supply, and the equivalent resistance is very small (if it is too large, the capacitors C1, C2...Cn cannot be fully charged within one cycle), usually less than 1Ω. When the IGBT tubes V1, V2...Vn are turned on at the same time, the high-voltage power supply discharges the resistors R1, R2...Rn. The high-voltage power supply voltage is calculated as 1kV, and the equivalent resistance of the resistors R1, R2...Rn is calculated as 1Ω. The specific defects are as follows:

[0015] Resistors R1, R2, ... Rn all withstand a high voltage of 1kV, and high voltage resistant resistors must be used;

[0016] When the discharge current is 1kA, the high-voltage power supply enters the constant current mode, the output voltage drops sharply, and the output voltage is unstable, resulting in poor stability of the final output pulse negative high voltage;

[0017] The peak power loss of resistors R1, R2, ..., Rn is 1MW. The greater the working ratio, the greater the loss. High-power resistors are needed, which require forced heat dissipation and occupy volume space.

[0018] To this end, we propose a high-voltage solid-state modulator pulse synchronization isolation circuit. Utility Model Content

[0019] The utility model aims to provide a high voltage solid state modulator pulse synchronous isolation circuit to solve the problems raised in the above background technology.

[0020] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a high-voltage solid-state modulator pulse synchronous isolation circuit, comprising a high-voltage solid-state modulator pulse synchronous isolation circuit, a modulation switch component and a fractional ratio pulse transformer, wherein the modulation switch component is electrically connected to the fractional ratio pulse transformer, and the high-voltage solid-state modulator pulse synchronous isolation circuit is electrically connected between the modulation switch component and a high-voltage power supply / charging power supply DC1kV-1.4kV, wherein the high-voltage power supply / charging power supply DC 1kV-1.4kV is set as a high-voltage power supply P1;

[0021] The high-voltage solid-state modulator pulse synchronous isolation circuit is mainly composed of AC / DC isolation buck, auxiliary power supply voltage stabilization, photoelectric conversion, isolation drive, electronic switch module S1 and power indication circuit. The AC / DC isolation buck is electrically connected to the auxiliary power supply voltage stabilization, the auxiliary power supply voltage stabilization is electrically connected to the photoelectric conversion and the isolation drive, the photoelectric conversion is electrically connected to the isolation drive, the isolation drive is electrically connected to the electronic switch module S1, and the power indication circuit is electrically connected to the AC / DC isolation buck;

[0022] The high-voltage solid-state modulator pulse synchronous isolation circuit is powered by AC220V mains, that is, the AC220V mains power supply end is typically connected to the AC / DC isolation step-down, and DC24V direct current is obtained through the AC / DC isolation step-down, and then stable DC5V and DC15V are obtained through the auxiliary power supply voltage stabilization to respectively power the photoelectric conversion and the isolation drive. The input of the photoelectric conversion is an ST optical fiber connector to realize the input of optical signals and pulse synchronization signals. The photoelectric conversion output is a 5V level signal, and then an isolated 15V level signal is obtained through the isolation drive. One end of the isolation drive is electrically connected to the photoelectric conversion. The isolation drive chip used by the isolation drive is HCPL3180, so as to control the on or off of the electronic switch module S1. The electronic switch module S1 is mainly composed of a plurality of IGBT tubes connected in parallel.

[0023] Preferably, the AC / DC isolation and voltage step-down adopts the AD / DC module power supply of HL20-23B15R2, and the AC / DC isolation and voltage step-down is used to convert AC220V to DC15V. A fuse FU1, a thermistor RN1, a capacitor C1, an inductor L1, a capacitor C2, a capacitor C3 and a capacitor C4 are electrically connected between the AD / DC module power supply and the AC220V power supply end of the mains.

[0024] Preferably, the fuse FU1 is used to prevent the circuit board from being damaged when the load is short-circuited;

[0025] The thermistor RN1 is used for current limiting and charge prevention, and detects the temperature when current flows through, so as to facilitate control and regulation;

[0026] The capacitor C1, the inductor L1 and the capacitor C2 form a filter circuit, and the filter circuit is used to achieve a filtering effect and filter out the AC voltage from the DC voltage;

[0027] The capacitor C3 and the capacitor C4 are used to form a Y capacitor group for achieving anti-electromagnetic interference.

[0028] Preferably, the chip used in the auxiliary power supply stabilization is an isolated power supply chip of WRB1205S-3WR2, and the isolated power supply chip is used to convert DC15V to DC5V. Capacitors C8 and C9 are electrically connected between the AC / DC isolation step-down and the auxiliary power supply stabilization. The capacitors C8 and C9 constitute an energy storage filter component, which is used to filter out the AC voltage in the DC voltage and realize energy storage.

[0029] Preferably, the auxiliary power supply stabilization is electrically connected to the photoelectric conversion, and the photoelectric conversion adopts an optocoupler N1, and the optocoupler N1 is used to isolate and output the fault signal. Capacitor C6 and capacitor C7 are electrically connected between the photoelectric conversion and the auxiliary power supply stabilization. The capacitor C6 and the capacitor C7 constitute an energy storage filter component, which is used to filter out the AC voltage in the DC voltage and realize energy storage of electrical energy.

[0030] Preferably, one side of the isolation driver chip is electrically connected to a fiber optic receiver N2, and the fiber optic receiver N2 is a photoelectric converter for converting optical signals into electrical signals. The isolation driver chip is used to increase the current driving capability and to isolate and drive the 5V level signal to obtain an isolated 15V level signal.

[0031] Preferably, one side of the isolation drive chip is electrically connected to a transistor V7, and the transistor V7 is used to achieve a pulse discharge effect. One side of the transistor V7 is electrically connected to an IGBT power tube V2, an IGBT power tube V3 and an IGBT power tube V4, and the IGBT power tube V2, the IGBT power tube V3 and the IGBT power tube V4 are connected in parallel, and the IGBT power tube V2, the IGBT power tube V3 and the IGBT power tube V4 are used as high-voltage electronic switches.

[0032] Preferably, the IGBT power tube V2, the IGBT power tube V3 and the IGBT power tube V4 are electrically connected with TVS voltage regulator tubes V1, TVS voltage regulator tube V5 and TVS voltage regulator tube V9, and the TVS voltage regulator tube V1, the TVS voltage regulator tube V5 and the TVS voltage regulator tube V9 are connected in series. The TVS voltage regulator tube V1, the TVS voltage regulator tube V5 and the TVS voltage regulator tube V9 are used to achieve voltage stabilization during voltage transmission and protect the stable operation of the IGBT power tube V2, the IGBT power tube V3 and the IGBT power tube V4.

[0033] Preferably, the modulation switch assembly includes a plurality of modulation switches, each of which includes an IGBT power tube V, a charging resistor R and a capacitor C. The charging resistor R is used to charge the capacitor C. The charging resistor R is used to perform primary discharge on the fractional ratio pulse transformer. After the fractional ratio pulse transformer is boosted, the secondary outputs a pulse negative high voltage of several hundred kV. After the pulse ends, the high-voltage power supply P1 replenishes the discharged electricity to the capacitor C, and this is one cycle.

[0034] Preferably, when the IGBT power tube V in the modulation switch assembly is turned on, the electronic switch module S1 in the high-voltage solid-state modulator pulse synchronous isolation circuit is disconnected to prevent the high-voltage power supply from directly discharging the charging resistor R; at this time, the IGBT power tube V is disconnected, and the electronic switch module S1 is closed, and the capacitor C is charged through the charging resistor R.

[0035] Compared with the prior art, the beneficial effects of the utility model are:

[0036] The pulse synchronous isolation circuit of the utility model adopts AC220V mains power supply, obtains DC24V direct current through AC / DC isolation and voltage reduction, and then obtains stable DC5V and DC15V through auxiliary power supply voltage stabilization to respectively power the photoelectric conversion and isolation drive. The input of the photoelectric conversion is an ST optical fiber connector, and the output is a 5V level signal, and then the isolated 15V level signal is obtained through the isolation drive, so as to control the electronic switch module S1 to be turned on or off. The electronic switch module S1 is mainly composed of a plurality of IGBT tubes connected in parallel, which effectively realizes the on and off processing;

[0037] The utility model has a simple circuit, and only needs AC220V power supply and ST optical fiber connector input to realize the pulse synchronization isolation function;

[0038] And the isolation voltage is high, the pulse synchronous isolation circuit can be suspended at a high potential for use, and the isolation voltage can reach 5kV;

[0039] And the charging resistor R does not need to withstand the high voltage of 1kV, an ordinary low-voltage resistor can be used; the high-voltage power supply P1 will not directly discharge the charging resistor R, the high-voltage power supply P1 always works in a constant voltage mode, and the final output pulse negative high voltage has good stability; the charging resistor R has low loss, and a small-power resistor can be used, without the need for additional heat dissipation, saving volume space. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of the system structure of the utility model;

[0041] Figure 2 This is a schematic diagram of the pulse synchronization isolation circuit of the utility model;

[0042] Figure 3 It is a circuit diagram of AC / DC isolation step-down, auxiliary power supply stabilization and photoelectric conversion of the utility model;

[0043] Figure 4 This is a schematic diagram of the isolation drive of the utility model;

[0044] Figure 5 This is a schematic diagram of a power indication circuit of the utility model;

[0045] Figure 6 The figure is a schematic diagram of a high voltage solid-state modulator circuit of the prior art of the utility model. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0047] See also Figure 1-Figure 5 The utility model provides a technical solution: a high-voltage solid-state modulator pulse synchronous isolation circuit, comprising a high-voltage solid-state modulator pulse synchronous isolation circuit, a modulation switch component and a fractional ratio pulse transformer, wherein the modulation switch component is electrically connected to the fractional ratio pulse transformer, and the high-voltage solid-state modulator pulse synchronous isolation circuit is electrically connected between the modulation switch component and a high-voltage power supply / charging power supply DC1kV-1.4kV, wherein the high-voltage power supply / charging power supply DC 1kV-1.4kV is set as a high-voltage power supply P1;

[0048] The high-voltage solid-state modulator pulse synchronous isolation circuit is mainly composed of AC / DC isolation buck, auxiliary power supply voltage stabilization, photoelectric conversion, isolation drive, electronic switch module S1 and power indication circuit. The AC / DC isolation buck is electrically connected to the auxiliary power supply voltage stabilization, the auxiliary power supply voltage stabilization is electrically connected to the photoelectric conversion and the isolation drive, the photoelectric conversion is electrically connected to the isolation drive, the isolation drive is electrically connected to the electronic switch module S1, and the power indication circuit is electrically connected to the AC / DC isolation buck;

[0049] The high-voltage solid-state modulator pulse synchronous isolation circuit is powered by AC220V mains, that is, the AC220V mains power supply end is typically connected to the AC / DC isolation step-down, and DC24V direct current is obtained through the AC / DC isolation step-down, and then stable DC5V and DC15V are obtained through the auxiliary power supply voltage stabilization to respectively power the photoelectric conversion and the isolation drive. The input of the photoelectric conversion is an ST optical fiber connector to realize the input of optical signals and pulse synchronization signals. The photoelectric conversion output is a 5V level signal, and then an isolated 15V level signal is obtained through the isolation drive. One end of the isolation drive is electrically connected to the photoelectric conversion. The isolation drive chip used by the isolation drive is HCPL3180, so as to control the on or off of the electronic switch module S1. The electronic switch module S1 is mainly composed of a plurality of IGBT tubes connected in parallel.

[0050] In order to achieve stable power supply to the system and realize voltage conversion and regulation, in this embodiment, preferably, the AC / DC isolation and voltage step-down adopts the AD / DC module power supply of HL20-23B15R2, and the AC / DC isolation and voltage step-down is used to convert AC220V to DC15V. The fuse FU1, thermistor RN1, capacitor C1, inductor L1, capacitor C2, capacitor C3 and capacitor C4 are electrically connected between the AD / DC module power supply and the AC220V power supply end of the mains.

[0051] In order to protect the power supply, filter the AC voltage in the DC voltage, and resist electromagnetic interference, in this embodiment, preferably, the fuse FU1 is used to prevent the circuit board from being damaged when the load is short-circuited;

[0052] The thermistor RN1 is used for current limiting and charge prevention, and detects the temperature when current flows through, so as to facilitate control and regulation;

[0053] The capacitor C1, the inductor L1 and the capacitor C2 form a filter circuit, and the filter circuit is used to achieve a filtering effect and filter out the AC voltage from the DC voltage;

[0054] The capacitor C3 and the capacitor C4 are used to form a Y capacitor group for achieving anti-electromagnetic interference.

[0055] In order to realize voltage stabilization and power supply, filtering and energy storage processing, in this embodiment, preferably, the chip used in the auxiliary power supply stabilization is the isolated power supply chip WRB1205S-3WR2, and the isolated power supply chip is used to convert DC15V to DC5V. Capacitor C8 and capacitor C9 are electrically connected between the AC / DC isolation step-down and the auxiliary power supply stabilization. The capacitor C8 and the capacitor C9 constitute an energy storage filter component, which is used to filter out the AC voltage in the DC voltage and realize energy storage.

[0056] In order to realize the conversion of electrical energy information into optical energy signals, and to facilitate transmission and anti-interference, in the present embodiment, preferably, the auxiliary power supply stabilization is electrically connected to the photoelectric conversion, and the photoelectric conversion adopts an optocoupler N1, and the optocoupler N1 is used to isolate and output the fault signal, and capacitors C6 and C7 are electrically connected between the photoelectric conversion and the auxiliary power supply stabilization, and the capacitors C6 and C7 constitute an energy storage filter component, which is used to filter out the AC voltage in the DC voltage and realize energy storage of electrical energy.

[0057] In order to realize the conversion of optical energy signals into electrical energy signals and realize current amplification, in the present embodiment, preferably, one side of the isolation driver chip is electrically connected to an optical fiber receiver N2, and the optical fiber receiver N2 is a photoelectric converter for realizing the conversion of optical signals into electrical signals. The isolation driver chip is used to increase the current driving capability and to isolate and drive the 5V level signal to obtain an isolated 15V level signal.

[0058] In order to realize isolation drive and facilitate on-off control, in the present embodiment, preferably, one side of the isolation drive chip is electrically connected with a transistor V7, and the transistor V7 is used to realize pulse discharge, and one side of the transistor V7 is electrically connected with an IGBT power tube V2, an IGBT power tube V3 and an IGBT power tube V4, and the IGBT power tube V2, the IGBT power tube V3 and the IGBT power tube V4 are connected in parallel, and the IGBT power tube V2, the IGBT power tube V3 and the IGBT power tube V4 are used as high-voltage electronic switches.

[0059] In order to achieve on-off control and facilitate control and regulation of the modulation switch component, in the present embodiment, preferably, the IGBT power tube V2, the IGBT power tube V3 and the IGBT power tube V4 are electrically connected with TVS voltage regulator tubes V1, TVS voltage regulator tubes V5 and TVS voltage regulator tubes V9, and the TVS voltage regulator tubes V1, the TVS voltage regulator tubes V5 and the TVS voltage regulator tubes V9 are connected in series, and the TVS voltage regulator tubes V1, the TVS voltage regulator tubes V5 and the TVS voltage regulator tubes V9 are used to achieve voltage stabilization during voltage transmission and protect the stable operation of the IGBT power tubes V2, the IGBT power tubes V3 and the IGBT power tubes V4.

[0060] In order to control the charging and discharging of the modulation switch component, in the present embodiment, preferably, the modulation switch component includes a plurality of modulation switches, each of the modulation switches includes an IGBT power tube V, a charging resistor R and a capacitor C, the charging resistor R is used to charge the capacitor C, the charging resistor R is used to perform primary discharge of the fractional ratio pulse transformer, after the fractional ratio pulse transformer is boosted, the secondary outputs a pulse negative high voltage of several hundred kV, after the pulse ends, the high voltage power supply P1 replenishes the discharged electricity to the capacitor C, and this is one cycle.

[0061] In order to achieve safe on-off control of the modulation switch component, in the present embodiment, preferably, when the IGBT power tube V in the modulation switch component is turned on, the electronic switch module S1 in the high-voltage solid-state modulator pulse synchronous isolation circuit is disconnected to prevent the high-voltage power supply from directly discharging the charging resistor R; at this time, the IGBT power tube V is disconnected, and the electronic switch module S1 is closed, and the capacitor C is charged through the charging resistor R.

[0062] The working principle and use process of the utility model are as follows: the high-voltage solid-state modulator pulse synchronization isolation circuit adopts AC220V mains power supply, that is, the AC220V mains power supply end is typically connected with the AC / DC isolation step-down, and DC24V direct current is obtained through the AC / DC isolation step-down, and then the auxiliary power supply voltage is stabilized to obtain stable DC5V and DC15V to power the photoelectric conversion and the isolation drive respectively. The input of the photoelectric conversion is an ST optical fiber connector to realize the input of the optical signal and the pulse synchronization signal. The photoelectric conversion output is a 5V level signal, and then the isolated 15V level signal is obtained through the isolation drive. One end of the isolation drive is electrically connected to the photoelectric conversion, and the isolation drive chip used by the isolation drive is HCPL3180, so as to control the electronic switch module. Block S1 is turned on or off, and the electronic switch module S1 is mainly composed of a plurality of IGBT tubes connected in parallel; and when the IGBT power tube V in the modulation switch assembly is turned on, the electronic switch module S1 in the high-voltage solid-state modulator pulse synchronous isolation circuit is disconnected to prevent the high-voltage power supply from directly discharging the charging resistor R; at this time, the IGBT power tube V is disconnected, and the electronic switch module S1 is closed, and the capacitor C is charged through the charging resistor R; that is, the charging resistor R is used to charge the capacitor C, and the charging resistor R is used to perform primary discharge on the fractional ratio pulse transformer. After the fractional ratio pulse transformer is boosted, the secondary outputs a pulse negative high voltage of several hundred kV. After the pulse ends, the high-voltage power supply P1 replenishes the discharged electricity to the capacitor C, and this is one cycle.

[0063] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high voltage solid state modulator pulse synchronization isolation circuit, characterized in that: It includes a high-voltage solid-state modulator pulse synchronous isolation circuit, a modulation switch component and a fractional ratio pulse transformer, wherein the modulation switch component is electrically connected to the fractional ratio pulse transformer, and the high-voltage solid-state modulator pulse synchronous isolation circuit is electrically connected between the modulation switch component and a high-voltage power supply / charging power supply DC 1kV-1.4kV, wherein the high-voltage power supply / charging power supply DC 1kV-1.4kV is set as a high-voltage power supply P1; The high-voltage solid-state modulator pulse synchronous isolation circuit is mainly composed of AC / DC isolation buck, auxiliary power supply voltage stabilization, photoelectric conversion, isolation drive, electronic switch module S1 and power indication circuit. The AC / DC isolation buck is electrically connected to the auxiliary power supply voltage stabilization, the auxiliary power supply voltage stabilization is electrically connected to the photoelectric conversion and the isolation drive, the photoelectric conversion is electrically connected to the isolation drive, the isolation drive is electrically connected to the electronic switch module S1, and the power indication circuit is electrically connected to the AC / DC isolation buck; The high-voltage solid-state modulator pulse synchronous isolation circuit is powered by AC220V mains, that is, the AC220V mains power supply end is typically connected to the AC / DC isolation step-down, and DC24V direct current is obtained through the AC / DC isolation step-down, and then stable DC5V and DC15V are obtained through the auxiliary power supply voltage stabilization to respectively power the photoelectric conversion and the isolation drive. The input of the photoelectric conversion is an ST optical fiber connector to realize the input of optical signals and pulse synchronization signals. The photoelectric conversion output is a 5V level signal, and then an isolated 15V level signal is obtained through the isolation drive. One end of the isolation drive is electrically connected to the photoelectric conversion. The isolation drive chip used by the isolation drive is HCPL3180, so as to control the on or off of the electronic switch module S1. The electronic switch module S1 is mainly composed of a plurality of IGBT tubes connected in parallel.

2. A high voltage solid state modulator pulse synchronous isolation circuit according to claim 1, characterized in that: The AC / DC isolation and voltage reduction adopts the AD / DC module power supply of HL20-23B15R2, and the AC / DC isolation and voltage reduction is used to convert AC220V to DC15V. A fuse FU1, a thermistor RN1, a capacitor C1, an inductor L1, a capacitor C2, a capacitor C3 and a capacitor C4 are electrically connected between the AD / DC module power supply and the AC220V power supply end of the mains.

3. A high voltage solid state modulator pulse synchronous isolation circuit according to claim 2, characterized in that: The fuse FU1 is used to prevent the circuit board from being damaged when the load is short-circuited; The thermistor RN1 is used for current limiting and charge prevention, and detects the temperature when current flows through, so as to facilitate control and regulation; The capacitor C1, the inductor L1 and the capacitor C2 form a filter circuit, and the filter circuit is used to achieve a filtering effect and filter out the AC voltage from the DC voltage; The capacitor C3 and the capacitor C4 are used to form a Y capacitor group for achieving anti-electromagnetic interference.

4. The high voltage solid state modulator pulse synchronous isolation circuit according to claim 1, characterized in that: The chip used in the auxiliary power supply stabilization is the isolated power supply chip WRB1205S-3WR2, and the isolated power supply chip is used to convert DC15V to DC5V. Capacitors C8 and C9 are electrically connected between the AC / DC isolation step-down and the auxiliary power supply stabilization. The capacitors C8 and C9 constitute an energy storage filter component, which is used to filter out the AC voltage in the DC voltage and realize energy storage.

5. The high voltage solid state modulator pulse synchronous isolation circuit according to claim 1, characterized in that: The auxiliary power supply stabilization is electrically connected to the photoelectric conversion. The photoelectric conversion adopts an optocoupler N1. The optocoupler N1 is used to isolate and output the fault signal. Capacitor C6 and capacitor C7 are electrically connected between the photoelectric conversion and the auxiliary power supply stabilization. The capacitor C6 and the capacitor C7 constitute an energy storage filter component, which is used to filter out the AC voltage in the DC voltage and realize energy storage of electric energy.

6. The high voltage solid state modulator pulse synchronous isolation circuit according to claim 1, characterized in that: One side of the isolation driver chip is electrically connected to a fiber optic receiver N2, which is a photoelectric converter for converting optical signals into electrical signals. The isolation driver chip is used to increase the current driving capability and to isolate and drive the 5V level signal to obtain an isolated 15V level signal.

7. The high voltage solid state modulator pulse synchronous isolation circuit according to claim 1, characterized in that: One side of the isolation drive chip is electrically connected to a transistor V7, and the transistor V7 is used to achieve a pulse discharge effect. One side of the transistor V7 is electrically connected to an IGBT power tube V2, an IGBT power tube V3 and an IGBT power tube V4, and the IGBT power tube V2, the IGBT power tube V3 and the IGBT power tube V4 are connected in parallel, and the IGBT power tube V2, the IGBT power tube V3 and the IGBT power tube V4 are used as high-voltage electronic switches.

8. A high voltage solid state modulator pulse synchronous isolation circuit according to claim 7, characterized in that: The IGBT power tube V2, the IGBT power tube V3 and the IGBT power tube V4 are electrically connected with TVS voltage regulator tubes V1, TVS voltage regulator tube V5 and TVS voltage regulator tube V9, and the TVS voltage regulator tubes V1, the TVS voltage regulator tube V5 and the TVS voltage regulator tube V9 are connected in series. The TVS voltage regulator tubes V1, the TVS voltage regulator tubes V5 and the TVS voltage regulator tubes V9 are used to achieve voltage stabilization during voltage transmission and protect the stable operation of the IGBT power tubes V2, the IGBT power tubes V3 and the IGBT power tubes V4.

9. The high voltage solid state modulator pulse synchronous isolation circuit according to claim 1, characterized in that: The modulation switch component includes a plurality of modulation switches, each of which includes an IGBT power tube V, a charging resistor R and a capacitor C. The charging resistor R is used to charge the capacitor C. The charging resistor R is used to perform primary discharge on the fractional ratio pulse transformer. After the fractional ratio pulse transformer is boosted, the secondary outputs a pulse negative high voltage of several hundred kV. After the pulse ends, the high voltage power supply P1 replenishes the discharged electricity to the capacitor C. This is one cycle.

10. A high voltage solid state modulator pulse synchronous isolation circuit according to claim 9, characterized in that: When the IGBT power tube V in the modulation switch assembly is turned on, the electronic switch module S1 in the high-voltage solid-state modulator pulse synchronous isolation circuit is disconnected to prevent the high-voltage power supply from directly discharging the charging resistor R; at this time, the IGBT power tube V is disconnected, and the electronic switch module S1 is closed, and the capacitor C is charged through the charging resistor R.

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