Multi-role integrated common mode choke for Marx generator

Abstract

The invention discloses a multi-role integrated common mode choke for a Marx generator. The multi-role integrated common mode choke comprises a foil type capacitive winding and a trigger switch. The foil type capacitive winding is formed by alternately stacking metal foils and insulating films and rolling the metal foils and the insulating films in parallel in the circumferential direction, the insulating films are arranged between the adjacent metal foils, and the metal foils and the insulating films jointly form an energy storage capacitor; each metal foil is a winding, two ends of each foil type capacitive winding are respectively provided with a lead, the head end and the tail end of each foil type capacitive winding are dotted terminals, and when the foil type capacitive windings work in a differential mode state, the foil type capacitive windings are connected with a charging power supply through low impedance. Current flows in from the dotted terminal of one foil type capacitive winding and flows out from the dotted terminal of the other foil type capacitive winding. As a basic unit, the multi-role integrated common mode choke can replace a traditional charging and discharging resistor, an energy storage capacitor and a trigger switch, is cascaded to form the Marx generator, is short in charging time, high in charging and discharging efficiency, capable of working at high repetition frequency, modularized and compact in structure.

Description

Technical Field

[0001] The invention relates to the technical field of high voltage testing, and in particular to a multi-role integrated common mode choke for a Max generator. Background Art

[0002] The Marx generator was first proposed by Erwin Marx of Germany in 1923. It is based on the working principle of "capacitors are charged in parallel and discharged in series", that is, the parallel capacitors are charged by a low-voltage power supply, and these capacitors are connected in series by a trigger switch to superimpose their voltages and obtain a multiplied pulse high voltage output to the test sample and other loads. The Marx generator has a simple circuit structure, flexible connection method, large adjustable parameter range and is easy to adjust.

[0003] Therefore, Marx generator, as an impulse voltage test device, is widely used in the fields of electromagnetic compatibility (EMC) test of electronic equipment, high voltage equipment test, pulse power and modern experimental physics.

[0004] At present, the Marx generator mainly includes resistance isolation type Marx generator and inductance isolation type Marx generator in terms of its electrical structure.

[0005] The schematic diagram of the traditional resistor-isolated Marx generator is as follows: Figure 3 As shown in the figure, the resistor acts as an isolation element between capacitors, forming a resistance-capacitance loop when charging and becoming a parallel component of the wave tail resistor when discharging. Figure 5 , it can be seen that the charging time is long. The charging efficiency of the traditional circuit is 50% under various charging methods. If the charging time is to be shortened, it is required to reduce the resistance of the isolation resistor and the time constant of the RC circuit. However, the isolation resistor consumes the energy stored in the capacitor during discharge. The use of a small-resistance isolation resistor consumes a lot of energy during discharge in the traditional circuit, the wave head time becomes longer and the wave peak is reduced, which also leads to a short wave tail time and fast decay, making it difficult to output a good quasi-square wave. Figure 6 and Figure 7 It is difficult for traditional circuits to achieve both short charging time to achieve high repetition frequency and excellent high-voltage square wave output, and the structure is not compact enough.

[0006] The inductively isolated Marx generator uses inductance to replace resistor charging. Its schematic diagram is as follows: Figure 4 shown.

[0007] When charging, the circuit equation of each charging circuit is:

[0008]

[0009] It can be seen that when the inductor-isolated Marx generator is charged, the inductance of each stage is the sum of the values ​​of the two inductance components of this stage, and LC oscillation can be formed.

[0010] When constant voltage charging is used, because the voltage on the inductor cannot change suddenly, the charging current first rises slowly and then falls. The actual charging time is long, and it is easy to oscillate and form overshoot, and the voltage of the energy storage capacitor is not easy to control; when constant current charging is used, the initial voltage drop on the inductor is large, the charging time is also long, and the voltage of the energy storage capacitor is also difficult to control. If a core inductor is used, the magnetic field strength is large under large current charging, so the cross-sectional area of ​​the iron core should be large. The inductor has internal resistance, and the charging efficiency of the inductor isolation Marx generator under constant voltage and constant current power supply is 50%, the same as the traditional circuit. At this time, resonant charging is used, and the efficiency can be close to 1.

[0011] When discharging, the circuit equation is:

[0012]

[0013] During discharge, the isolation inductor forms a parallel equivalent inductor for the energy storage capacitor.

[0014] L eff =L / 2.

[0015] What is important is that, in fact, when these two types of Marx generators discharge to a load such as a test piece, the current flowing between the resistors or inductors at the same level has no correlation and no mutual restriction.

[0016] To this end, the inventor has submitted an invention patent "A Max generator based on distributed common-mode choke" (PCN23004914, in the actual examination status). The common-mode choke windings of the Max generator based on distributed common-mode chokes are connected in series with the same-polarity electrodes of the energy storage capacitors arranged in parallel. The first end of the first-stage common-mode choke winding is connected to the charging power supply, the first-stage trigger switch is connected to the first end of the second-last winding and the tail end of the last winding of the same-stage common-mode choke, and the remaining trigger switches are connected to the first end of the first winding and the tail end of the last winding of the same-stage common-mode choke; the tail end of the first winding of the last-stage common-mode choke is the output end. When the generator is charged, the common-mode choke works in differential mode, with a small equivalent impedance, and the energy storage capacitors are connected in parallel; when the trigger switch is closed, the energy storage capacitors are discharged in series, and the common-mode choke works in common mode with a large equivalent impedance. Practical applications show that this Max generator based on distributed common-mode choke has a short charging time and is suitable for a variety of charging methods; it has high charging and discharging efficiency and can be charged and discharged at a high repetition frequency.

[0017] However, whether it is a resistive isolation type Max generator, an inductive isolation type Max generator, or a Max generator based on a distributed common mode choke proposed by the inventor, they are all Max generators based on discrete components, which have the disadvantages of large size, large equivalent inductance of the discharge loop, and long rise time of the discharge pulse. The development of industrial applications and military weapons urgently requires compact, miniaturized and modularized pulse power devices.

[0018] In order to overcome the shortcomings of the conventional Marx generator and its various improvements, the present invention proposes a Marx generator based on a multi-role integrated common mode choke, the structure of which is as follows: Figure 1 As shown, the equivalent circuit is shown in Figure 2 . The multi-role integrated common mode choke includes a foil capacitor winding and a trigger switch, which may or may not have an iron core. The foil capacitor winding is made of metal foil and insulating film alternately stacked and rolled in parallel along the circumferential direction. The metal foil and the insulating film in between form an energy storage capacitor; each metal foil is a winding, and wiring is led out at both ends. There is mutual inductance between the windings, and the head end is the same-name end. The trigger switch connects the head end of one winding and the tail end of the other winding. The charging current flows into the same-name end of one winding and flows out of the same-name end of the other winding; when the trigger switch is closed, the discharge current flows out of the two ends of the same winding and flows into the corresponding two ends of the other winding through the load. As a basic unit, the multi-role integrated common mode choke can replace the traditional charging and discharging resistors, energy storage capacitors and trigger switches, and cascade to form a Max generator, which has a short charging time, high charging and discharging efficiency, can work at a high repetition frequency, and is modular and compact. Summary of the invention

[0019] The purpose of the present invention is to address the deficiencies in the prior art and to provide a multi-role integrated common mode choke for a Max generator, which can replace traditional charging and discharging resistors, energy storage capacitors and trigger switches, and is cascaded to form a Max generator. The Max generator has a short charging time, high charging and discharging efficiency, can operate at a high repetition frequency, and is modular and compact in structure.

[0020] To achieve the above object, the technical solution adopted by the present invention is:

[0021] A multi-role integrated common mode choke for a Max generator comprises a foil capacitor type winding and a trigger switch, wherein the trigger switch is coaxially arranged with the foil capacitor type winding.

[0022] Furthermore, the foil capacitor winding is formed by alternately stacking metal foil and insulating film and winding them in parallel in multiple turns along the circumferential direction.

[0023] Furthermore, in the foil capacitor winding, each metal foil is a winding, leads are respectively arranged at both ends of the foil capacitor winding, and the head end and the tail end of each foil capacitor winding are the same end.

[0024] Furthermore, there is mutual inductance between the foil capacitor type windings, and the mutual inductance plays a reducing role during charging, which is used to offset the inductance of the foil capacitor type winding. When the foil capacitor type winding works in a differential mode, it is connected to the charging power supply with low impedance, and current flows into the same-name end of one foil capacitor type winding and flows out of the same-name end of the other foil capacitor type winding.

[0025] Furthermore, the foil capacitor type winding is in a working mode when in discharge operation, that is, the current does not flow directly between the foil capacitor type windings, but passes through a main discharge loop formed by all trigger switches and loads.

[0026] Furthermore, when the foil capacitor winding is discharged, the two ends of the foil capacitor winding are respectively close to the power supply side and close to the load side, and both ends are in a differential mode state. The current flows out from the two ends of one foil capacitor winding close to the power supply side and close to the load side, respectively, and flows back to the same-named end of the other foil capacitor winding through the main discharge circuit formed by all trigger switches and the load.

[0027] Furthermore, in the foil capacitor winding, an insulating film is provided between adjacent metal foils, and the adjacent metal foils and the insulating film together form an energy storage capacitor.

[0028] Furthermore, the trigger switch is respectively connected to a head end of a foil capacitor type winding and a tail end of another foil capacitor type winding.

[0029] Furthermore, when the foil capacitor winding is used for a unilaterally charged Max generator, it comprises two layers of metal foil, which respectively constitute a first winding and a second winding; when it is used for a bilaterally charged Max generator, the foil capacitor winding comprises three layers of metal foil, which respectively constitute a first winding, a second winding and a third winding.

[0030] Furthermore, the multi-role integrated common mode choke also includes a magnetic core, the foil capacitor winding is wound and connected with the magnetic core to form an integral body, and the trigger switch is arranged on the inner side or the outer side of the capacitor winding and the magnetic core.

[0031] Compared with the prior art, the present invention has the following advantages:

[0032] The multi-role integrated common mode choke of the present invention is used as a basic unit to replace the isolation resistors or inductors, energy storage capacitors and trigger switches of the traditional Marx generator, and the cascade connection forms a new Marx generator. The Marx generator based on the multi-role integrated common mode choke has the advantages of compactness, miniaturization and modularity.

[0033] Furthermore, the assembly and maintenance of the Marx generator based on the multi-role integrated common mode choke are simple and convenient, with less workload and low labor intensity.

[0034] Since the Marx generator based on the multi-role integrated common mode choke has a compact structure and small size, the equivalent inductance of the discharge main circuit is small and the discharge rising edge is steep.

[0035] The Marx generator based on the multi-role integrated common mode choke works in differential mode when charging, with small equivalent impedance, short charging time, high efficiency, low loss, and can achieve high repetition frequency operation.

[0036] The multi-role integrated common mode choke replaces the capacitors and charging and discharging resistors at each level of the traditional Marx generator, reduces their shell and external insulation materials and space, and improves the volume power density of the Marx generator. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 This is a basic multi-role integrated common mode choke structure diagram for Marx generator;

[0039] Among them, 1 is the iron core, 2-1 is the first lead, 2-2 is the second lead, 2-3 is the third lead, 2-4 is the fourth lead; 3 is the foil capacitor winding; 4 is the trigger switch; 5 is the insulating support.

[0040] Figure 2 The schematic diagram of the Marx generator based on the multi-role integrated common mode choke. The dotted box is the equivalent circuit diagram of a multi-role integrated common mode choke, S i (i=1, 2, ...) is a trigger switch.

[0041] Figure 3 This is the schematic diagram of the resistor-isolated Marx generator.

[0042] Figure 4 This is the schematic diagram of the inductively isolated Marx generator.

[0043] Figure 5 It is the charging waveform of the resistance isolation Marx generator and the multi-role integrated common mode choke Marx generator under constant power supply voltage.

[0044] Figure 6 It is the capacitor discharge waveform of the resistor-isolated Marx generator and the multi-role integrated common-mode choke Marx generator pair with the same capacitance as the series energy storage capacitor.

[0045] Figure 7 This is the discharge waveform of the resistor-isolated Marx generator and the multi-role integrated common-mode choke Marx generator to a 50-ohm resistor.

[0046] Figure 8 A multi-role integrated common mode choke for a single-sided charging Marx generator with a trigger switch arranged on the outside and radial discharge.

[0047] Among them, 1 is the iron core, 2-1 is the first lead, 2-2 is the second lead, 2-3 is the third lead, 2-4 is the fourth lead, 3 is the foil capacitor winding, 4-1 is the outer electrode of the trigger switch, 4-2 is the inner electrode of the trigger switch, and 5 is the insulating support.

[0048] Fig. 9 This is a multi-role integrated common mode choke for axially discharged Marx generators for bilateral charging.

[0049] Among them, 1 is the iron core, 2-1 is the first lead, 2-2 is the second lead, 2-3 is the third lead, 2-4 is the fourth lead, 2-5 is the fifth lead, 2-6 is the sixth lead, 3 is the foil capacitor winding, 4-1 is the outer electrode of the trigger switch, 4-2 is the inner electrode of the trigger switch, and 5 is the insulating support.

[0050] Fig.10 This is a multi-role integrated common mode choke for radially discharged Marx generators for bilateral charging.

[0051] Among them, 1 is the iron core, 2-1 is the first lead, 2-2 is the second lead, 2-3 is the third lead, 2-4 is the fourth lead, 2-5 is the fifth lead, 2-6 is the sixth lead, 3 is the foil capacitor winding, 4 is the trigger switch, and 5 is the insulating support.

[0052] Fig.11 Schematic diagram of the winding of the double-winding foil capacitor type of the multi-role integrated common mode choke for the unilaterally charged Marx generator.

[0053] Among them, 2-1, 2-2, 2-3 and 2-4 are respectively the first lead, second lead, third lead and fourth lead of the double-winding foil capacitor winding, 6-1 and 6-2 are respectively the first metal foil and second metal foil of the double-winding foil capacitor winding, 7-1 and 7-2 are respectively the first insulating film and second insulating film of the double-winding foil capacitor winding.

[0054] Fig.12 Schematic diagram of the three-winding foil capacitor type winding of the multi-role integrated common mode choke for the Marx generator for bilateral charging.

[0055] Among them, 2-1, 2-2, 2-3, 2-4, 2-5 and 2-6 are respectively the first lead, second lead, third lead, fourth lead, fifth lead and sixth lead of the three-winding foil capacitor winding, 6-1, 6-2 and 6-3 are respectively the first metal foil, second metal foil and third metal foil of the three-winding foil capacitor winding, 7-1, 7-2 and 7-3 are respectively the first insulating film, second insulating film and third insulating film of the three-winding foil capacitor winding.

[0056] Fig.13 The schematic diagram of a bidirectionally charged Marx generator based on a three-winding, multi-role integrated common-mode choke.

[0057] In the figure, S i (i=1,2,…) and K o is the trigger switch, D1 and D2 are diodes, and T is a transformer. DETAILED DESCRIPTION

[0058] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0059] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0060] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0061] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the invented product is usually placed when in use. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In addition, if the term "horizontal" appears, it does not mean that the component is required to be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0062] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0063] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0064] Example 1

[0065] See also Fig.11 The embodiment of the present invention discloses a method for winding a double-winding foil capacitor type winding. Specifically, the ends of the first metal foil 6-1 and the second metal foil 6-2 are connected to the first lead 2-1 and the second lead 2-2. The first metal foil 6-1, the first insulating film 7-1, the second metal foil 6-2 and the second insulating film 6-2 are alternately stacked and wound along the circumferential direction. After the winding is completed, the ends of the first metal foil 6-1 and the second metal foil 6-2 are connected to the third lead 2-3 and the fourth lead 2-4. The first metal foil 6-1 constitutes a first winding, and the second metal foil 6-2 constitutes a second winding.

[0066] See also Figure 1 The embodiment of the present invention discloses a multi-role integrated common mode choke for Marx generators for unilateral charging and axial discharge, specifically: a double-winding foil capacitor winding 3 is wound on an iron core 1; a trigger switch 4 is placed inside the foil capacitor winding 3 and the iron core 1, connecting the head end of one winding and the tail end of the other winding; an insulating support 5 supports the trigger switch 4 and isolates the foil capacitor winding 3 and the iron core 1. During discharge, the current is conducted along the axial direction.

[0067] See also Figure 2 The embodiment of the present invention discloses a Marx generator for unilateral charging based on a multi-role integrated common mode choke. Specifically, the multi-role integrated common mode choke is used as a basic unit, and multiple stages of multi-role integrated common mode chokes are connected in series. The head end of the rear stage multi-role integrated common mode choke is correspondingly connected to the tail end of the front stage multi-role integrated common mode choke, the head end of the first stage common mode choke winding is connected to the charging power supply, and the tail end of the last stage multi-role integrated common mode choke is the output end and is triggered by the discharge switch K. o Connect the load. When charging, the charging power passes through the charging resistor r i When supplying power to the Marx generator based on the multi-role integrated common mode choke, the trigger discharge switch does not work and is in the open state. For the charging curve, see Figure 5 When discharging, each stage triggers the discharge switch and K o When the switch is closed, the Marx generator discharges to the load Z. The discharge curve is shown in Figure 6 and Figure 7 , Figure 6 For the Marx generator to discharge the capacitive load, Figure 7 Discharge the Marx generator into a resistive load.

[0068] Example 2

[0069] See also Figure 8 The embodiment of the present invention discloses a multi-role integrated common mode choke for unilateral charging and radial discharge, specifically: a double-winding foil capacitor winding 3 is wound on an iron core 1; a trigger switch is placed outside the foil capacitor winding 3 and the iron core 1, connecting the head end of one winding and the tail end of the other winding; an insulating support 5 is provided between the outer electrode 4-1 of the trigger switch and the inner electrode 4-2 of the trigger switch, and the current is conducted radially during discharge.

[0070] Example 3

[0071] See also Fig.12The embodiment of the present invention discloses a three-winding foil capacitor winding method, specifically: the ends of the first metal foil 6-1, the second metal foil 6-2 and the third metal foil 6-3 are respectively connected to the first lead 2-1, the second lead 2-2 and the third lead 2-3, the first metal foil 6-1, the first insulating film 7-1, the second metal foil 6-2, the second insulating film 7-2, the third metal foil 6-3 and the third insulating film 7-3 are alternately stacked and wound along the circumferential direction, and after the winding is completed, the ends of the first metal foil 6-1, the second metal foil 6-2 and the third metal foil 6-3 are respectively connected to the fourth lead 2-4, the fifth lead 2-5 and the sixth lead 2-6. The first metal foil 6-1 constitutes the first winding, the second metal foil 6-2 constitutes the second winding, and the third metal foil 6-3 constitutes the third winding.

[0072] See also Fig. 9 The embodiment of the present invention discloses a multi-role integrated common mode choke for bilateral charging and radial discharge for Marx generator, specifically: a three-winding foil capacitor winding 3 is wound on an iron core 1; a discharge trigger switch is placed outside the foil capacitor winding 3 and the iron core 1, and an insulating support 5 supports the trigger switch outer electrode 4-1 and the discharge trigger switch inner electrode 4-2. When the discharge trigger switch discharges, the current is conducted radially. When the multi-role integrated common mode choke is used as the first stage of the Marx generator, the discharge trigger switch connects the head end of the second winding and the tail end of the third winding; when used as other stages of the Marx generator, the discharge trigger switch connects the head end of the first winding and the tail end of the third winding.

[0073] See also Fig.13 The embodiment of the present invention discloses a Marx generator for bilateral charging based on a three-winding multi-role integrated common-mode choke. Specifically: the multi-role integrated common-mode choke is used as a basic unit, and multiple stages of multi-role integrated common-mode chokes based on three windings are connected in series. The head end of the rear-stage multi-role integrated common-mode choke is correspondingly connected to the tail end of the front-stage multi-role integrated common-mode choke. The head end of the first-stage common-mode choke winding is connected to the charging power supply, and the tail end of the last-stage multi-role integrated common-mode choke is the output end and connected to the load through the trigger discharge switch Ko. During charging, the charging power supply supplies power to the Marx generator based on the multi-role integrated common-mode choke through diodes D1 and D2, and the trigger discharge switch does not work and is in the open state. For the charging curve, see Figure 5 During discharge, each stage triggers the discharge switch and Ko is closed based on the multi-role integrated common mode choke. The Marx generator discharges to the load Z. The discharge curve is shown in Figure 6 and Figure 7 , Figure 6 For the Marx generator to discharge the capacitive load, Figure 7 Discharge the Marx generator into a resistive load.

[0074] Example 4

[0075] See also Fig.10 The embodiment of the present invention discloses a multi-role integrated common mode choke for a Marx generator with bilateral charging and axial discharge, specifically: a foil capacitor winding 3 is wound on an iron core 1 along the length direction; a first lead 2-1, a second lead 2-2, a third lead 2-3, a fourth lead 2-4, a fifth lead 2-5, and a sixth lead 2-6 are led out from the metal foil end of the foil capacitor winding 3; a trigger switch 4 is placed inside the foil capacitor winding 3 and the iron core 1; an insulating support 5 is provided between the discharge switch 4 and the iron core 1. During discharge, the current is conducted along the axial direction.

[0076] When the multi-role integrated common mode choke is used as the first stage of the Marx generator, the trigger switch connects the head end of the second winding and the tail end of the third winding; when used as other stages of the Marx generator, the trigger switch connects the head end of the first winding and the tail end of the third winding.

[0077] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A multi-role integrated common mode choke for a Max generator, characterized in that: The invention comprises a foil capacitor type winding and a trigger switch, wherein the trigger switch is coaxially arranged with the foil capacitor type winding.

2. A multi-role integrated common mode choke for a Max generator according to claim 1, characterized in that: The foil capacitor winding is formed by alternately stacking metal foil and insulating film and winding them in parallel in a circumferential direction for multiple turns.

3. A multi-role integrated common mode choke for a Max generator according to claim 1, characterized in that: In the foil capacitor winding, each metal foil is a winding, and leads are respectively arranged at both ends of the foil capacitor winding, and the head end and the tail end of each foil capacitor winding are both ends with the same name.

4. The multi-role integrated common mode choke for a Max generator according to claim 1, characterized in that: There is mutual inductance between the foil capacitor type windings, and the mutual inductance plays a reducing role during charging, which is used to offset the inductance of the foil capacitor type winding. When the foil capacitor type winding works in a differential mode, it is connected to a charging power supply with low impedance, and current flows into the same-name end of one foil capacitor type winding and flows out from the same-name end of another foil capacitor type winding.

5. The multi-role integrated common mode choke for a Max generator according to claim 1, characterized in that: When the foil capacitor type winding is in discharge operation, it is in a working mode, that is, the current does not flow directly between the foil capacitor type windings, but passes through the main discharge loop formed by all trigger switches and loads.

6. A multi-role integrated common mode choke for a Max generator according to claim 1, characterized in that: When the foil capacitor type winding is discharged, the two ends of the foil capacitor type winding are respectively close to the power supply side and the load side, and both ends are in a differential mode state. Current flows out from the two ends of one foil capacitor type winding close to the power supply side and the load side respectively, and flows back to the same end of the other foil capacitor type winding through the main discharge circuit formed by all trigger switches and the load.

7. A multi-role integrated common mode choke for a Max generator according to claim 1, characterized in that: In the foil capacitor winding, an insulating film is arranged between adjacent metal foils, and the adjacent metal foils and the insulating film together form an energy storage capacitor.

8. The multi-role integrated common mode choke for a Max generator according to claim 1, characterized in that: The trigger switches are respectively connected to a head end of a foil capacitor type winding and a tail end of another foil capacitor type winding.

9. The multi-role integrated common mode choke for a Max generator according to claim 1, characterized in that: When used in a Max generator for single-side charging, the foil capacitor type winding comprises two layers of metal foil, which respectively constitute a first winding and a second winding; when used in a Max generator for double-side charging, the foil capacitor type winding comprises three layers of metal foil, which respectively constitute a first winding, a second winding and a third winding.

10. The multi-role integrated common mode choke for a Max generator according to claim 1, characterized in that: The multi-role integrated common mode choke coil also includes a magnetic core, a foil capacitor winding and the magnetic core are wound and connected to form an integral body, and a trigger switch is arranged on the inner side or the outer side of the capacitor winding and the magnetic core.

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