Topology method of high-frequency high-voltage direct-current power supply inversion LCC resonance charging circuit

Abstract

The invention relates to a high-frequency and high-voltage direct-current power supply circuit topology method, in particular to a high-frequency and high-voltage direct-current power supply inversion LCC resonance charging circuit topology method, and solves the technical problem that the input voltage is greatly reduced due to insufficient withstand voltage and insufficient radiation resistance of an existing semiconductor switching device. The high-frequency high-voltage direct-current power supply inversion LCC resonance charging circuit topology method comprises the following steps: 1) decomposing an original inversion H-bridge LCC resonance circuit unit into n new inversion H-bridge LCC resonance circuit units from a circuit topology; 2) arranging gating and cutting-off devices of the inverter H-bridge LCC resonance circuits in the n new inverter H-bridge LCC resonance circuit units; 3) connecting the input ends of the inverter H-bridge LCC resonant circuit in series and equalizing voltage and then connecting with the high-frequency high-voltage direct-current power supply, and 4) connecting the output ends of the inverter H-bridge LCC resonant circuit in parallel and converging and then connecting with a high-frequency transformer of the high-voltage direct-current power supply, thereby finishing the inverter LCC resonant charging circuit topology of the high-frequency high-voltage direct-current power supply.

Description

Technical Field

[0001] The invention relates to a high-frequency and high-voltage direct current power supply circuit topology method, and in particular to a high-frequency and high-voltage direct current power supply inverter LCC resonant charging circuit topology method. Background Art

[0002] High-voltage DC power supplies are widely used in new energy vehicles, electric locomotives, ships and submarines, aerospace, weapons and equipment, etc. In order to achieve lightweight and miniaturized high-voltage DC power supplies, high-frequency resonance is generally used to reduce the weight and volume of the high-frequency and high-voltage transformer of the high-voltage DC power supply; in order to suppress the influence of the distributed capacitance of the high-frequency and high-voltage transformer windings and improve the load charging voltage, charging efficiency and charging rate, high-frequency and high-voltage resonant power supplies often use high-frequency and high-voltage LCC series-parallel resonance technology solutions.

[0003] For high-frequency and high-voltage LCC resonant charging power supply, the input DC and low-voltage energy is inverted through the H-bridge and LCC resonant circuit, and then output to the high-frequency and high-voltage transformer for step-up conversion, and finally output DC high-voltage energy through high-voltage rectification conversion. When the DC voltage input to the high-frequency and high-voltage LCC resonant charging power supply is as high as 1 to 10 kV, or even higher, the H-bridge of the high-frequency and high-voltage LCC resonant charging power supply inverter will withstand the high voltage; in order to minimize the switching loss and heat generation of the H-bridge inverter switch tube, and improve the reliability and service life of the H-bridge switch tube device, the turn-on time and turn-off time of the H-bridge inverter switch tube are generally not longer than 50ns. The existing ns-level high-frequency inverter switch tubes, but it is difficult to solve the problem of both high voltage resistance (1 to 10 kV level) and large current (≥DC100A), which greatly limits the application of high-frequency and high-voltage LCC resonant charging power supply.

[0004] In addition, in the emerging field of high-voltage and high-power space power supply, affected by the radiation of high-energy particles and rays in space, the withstand voltage level of the H-bridge switch tube of the space power inverter is seriously degraded with the accumulation of operating time and radiation dose. Taking the third-generation power semiconductor switch tube with relatively superior radiation resistance as an example, the rated voltage of DC600V~DC1700V and the current of DC100A of SiC MOSFET drops to DC200~250V after single particle radiation; the rated voltage of DC650V and the current of DC50~100A of GaN high electron mobility transistor (HEMT) drops to DC~300V after single particle radiation. The radiation causes the withstand voltage of the H-bridge switch tube of the power inverter to be seriously degraded, which reduces the safe input working voltage level of the high-frequency and high-voltage LCC resonant charging power supply to below DC300V, which greatly limits the application of high-frequency and high-voltage LCC resonant charging power supply in the field of space high-power power supply. At present, from the perspective of H-bridge switch tube devices, research on solving the problem of single-tube high voltage resistance and single-tube voltage resistance and radiation degradation has been carried out, but due to the defects of semiconductor materials, progress is not obvious and it is difficult to achieve a substantial breakthrough in the short term. From the perspective of the topological structure of the high-frequency and high-voltage power supply LCC resonant circuit, through reasonable circuit topology design, the problem of H-bridge switch tube devices withstanding high voltage and single-tube voltage resistance and radiation degradation can be better solved.

[0005] How to design a circuit topology structure of LCC resonant inverter from the perspective of high-frequency and high-voltage power supply LCC resonant circuit, effectively solve the problem of low input working voltage of power inverter H-bridge caused by insufficient withstand voltage and insufficient radiation resistance of H-bridge switch tube devices, and realize safe and reliable operation of power supply, which is of great significance and practical value for the application and promotion of high-frequency and high-voltage LCC resonant charging power supply. Due to the complex working mode and parameter debugging of high-frequency and high-voltage LCC resonant charging power supply, no public research reports on the LCC resonant charging circuit topology method for improving the input working voltage of high-frequency and high-voltage power inverter H-bridge have been found. Summary of the invention

[0006] The purpose of the present invention is to solve the technical problem of a substantial reduction in input voltage caused by insufficient withstand voltage and insufficient radiation resistance of existing semiconductor switching devices, and to provide a high-frequency and high-voltage DC power supply inverter LCC resonant charging circuit topology method.

[0007] In order to achieve the above object, the present invention adopts the following technical solution:

[0008] A high-frequency and high-voltage direct current power supply inverter LCC resonant charging circuit topology method, which is special in that it includes the following steps:

[0009] 1] Decompose the original inverter H-bridge LCC resonant circuit unit into n new inverter H-bridge LCC resonant circuit units from the circuit topology; n is an integer, and n≥2;

[0010] 2] Setting the gating and cutting devices of the inverter H-bridge LCC resonant circuit in n new inverter H-bridge LCC resonant circuit units;

[0011] 3] Connect the input ends of the inverter H-bridge LCC resonant circuits in n new inverter H-bridge LCC resonant circuit units in series and then connect them to a high-frequency and high-voltage DC power supply;

[0012] 4] The output ends of the inverter H-bridge LCC resonant circuits in n new inverter H-bridge LCC resonant circuit units are connected in parallel and then connected to the high-frequency transformer of the high-voltage DC power supply to complete the high-frequency and high-voltage DC power supply inverter LCC resonant charging circuit topology.

[0013] Furthermore, step 1 is specifically as follows:

[0014] 1.1. Determine the original inverter H-bridge LCC resonant circuit unit;

[0015] The original inverter H-bridge LCC resonant circuit unit includes an inverter H-bridge S1-S2-S3-S4, an LC resonant arm Lr1-Cr1 and an LC resonant arm Lr2-Cr2;

[0016] 1.2. Decompose the inverter H bridge S1-S2-S3-S4 into n inverter H bridges Si1-Si2-Si3-Si4 with the same structure from the circuit topology, i=1,...,n;

[0017] 1.3. Decompose the LC resonant arm Lr1-Cr1 into n LC resonant arms Lri1-Cri1 from the circuit topology;

[0018] 1.4. Decompose the LC resonant arm Lr2-Cr2 into n LC resonant arms Lri2-Cri2 from the circuit topology;

[0019] 1.5. Connect the two output ends of the inverter H bridge Si1-Si2-Si3-Si4 to the corresponding LC resonant arms Lri1-Cri1 and Lri2-Cri2 respectively to form n new inverter H bridge LCC resonant circuit units.

[0020] Furthermore, step 2 is specifically as follows:

[0021] 2.1. Connect fuses in series at the positive ends of the input busbars of the n-way new inverter H-bridge LCC resonant circuit units, respectively, to provide overcurrent protection for the corresponding new inverter H-bridge LCC resonant circuit units;

[0022] 2.2. The output positive ends of the n new inverter H-bridge LCC resonant circuit units are respectively connected in series with a gate relay Ki to control the gate and cutoff of the corresponding new inverter H-bridge LCC resonant circuit unit.

[0023] Furthermore, step 3 is specifically as follows:

[0024] 3.1. Connect filter capacitors C01, ..., C0n in parallel between the input high end and input low end of n new inverter H-bridge LCC resonant circuit units;

[0025] 3.2. Connect n filter capacitors C01, ..., C0n in series to balance the voltage;

[0026] 3.3. Connect the high end of the filter capacitor C01 in series to the total positive input of the high-frequency and high-voltage DC power supply, and connect the low end of the filter capacitor C0n to the total negative input of the high-frequency and high-voltage DC power supply.

[0027] Furthermore, step 4 is specifically as follows:

[0028] Define the equivalent parallel resonant capacitance at the primary input of the high-frequency transformer of the high-voltage DC power supply as Cp;

[0029] The output high voltage end and the output low voltage end of the n-way new inverter H-bridge LCC resonant circuit unit are respectively connected in parallel to the equivalent parallel resonant capacitor Cp of the primary input end of the high-frequency transformer of the high-voltage DC power supply to complete the high-frequency and high-voltage DC power supply inverter LCC resonant charging circuit topology.

[0030] Further, in step 1.3, the value of Lri1 in the LC resonant arm is equal to or unequal to the value of Lr1 in the LC resonant arm;

[0031] The Cri1 value in the LC resonance arm is equal to or unequal to the Cr1 value in the LC resonance arm.

[0032] Further, in step 1.4, the Lri2 value in the LC resonant arm is equal to or unequal to the Lr2 value in the LC resonant arm;

[0033] The Cri2 value in the LC resonance arm is equal to or unequal to the Cr2 value in the LC resonance arm.

[0034] Furthermore, in step 3.3, the values ​​of the n filter capacitors C01, ..., C0i, ..., C0n are equal.

[0035] Furthermore, in step 3.3, the C0i=50n.

[0036] Beneficial effects of the present invention:

[0037] 1. The present invention discloses a high-frequency, high-voltage, direct current power supply inverter LCC resonant charging circuit topology method, which realizes n-stage inverter H-bridge series voltage-equalizing input and n-way LCC resonant circuit parallel return output at the input end of the high-frequency, high-voltage direct current power supply. Compared with a single inverter H-bridge LCC resonant circuit, the input voltage is increased by n-1 times, and the output power is increased by n-1 times when the input bus current remains basically unchanged, thereby solving the problem of a significant reduction in the power supply input bus voltage and power due to insufficient withstand voltage and insufficient radiation resistance of semiconductor switching devices under special environments such as high voltage and radiation.

[0038] 2. The present invention provides a high-frequency, high-voltage, direct current power supply inverter LCC resonant charging circuit topology method, which realizes the free switching on and off of multiple inverter H-bridge LCC resonant circuit units through the cooperation of bus fuses and relays, and multiple inverter H-bridge LCC resonant circuit units can back up each other, thereby solving the problem of safety and reliability of high-frequency, high-voltage, direct current power supply.

[0039] 3. The present invention discloses a high-frequency, high-voltage DC power inverter LCC resonant charging circuit topology method, which has the advantages of simple principle, convenient debugging, high input voltage and power level, simple expansion and integration, free selection and fault cut-off, and mutual backup, which is safer and more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a structural schematic diagram of decomposing an original inverter H-bridge LCC resonant circuit unit into n new inverter H-bridge LCC resonant circuit units in an embodiment of the present invention;

[0041] Figure 2 is a schematic diagram of a structure of connecting a fuse and a gating relay in an embodiment of the present invention;

[0042] Figure 3 is a schematic diagram of a structure of connecting a filter capacitor in an embodiment of the present invention;

[0043] Figure 4 Schematic diagram of the structure of connecting equivalent parallel resonant capacitors in an embodiment of the present invention. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0045] A high-frequency and high-voltage direct current power supply inverter LCC resonant charging circuit topology method comprises the following steps:

[0046] Step 1: Decompose the original inverter H-bridge LCC resonant circuit unit into n modules from the circuit topology, i.e., n new inverter H-bridge LCC resonant circuit units; n is an integer, and n≥2; wherein the original inverter H-bridge LCC resonant circuit unit includes an inverter H-bridge S1-S2-S3-S4, a series LC resonant arm Lr1-Cr1, and a series LC resonant arm Lr2-Cr2;

[0047] like Figure 1 As shown, the inverter H bridge S1-S2-S3-S4 is decomposed into n inverter H bridges Si1-Si2-Si3-Si4 with the same structure from the circuit topology, i=1,...,n;

[0048] First, one of the LC resonant arms Lr1-Cr1 connected in series at the output end of the inverter H-bridge S1-S2-S3-S4 is decomposed into n series LC resonant arms Lri1-Cri1 from the circuit topology; in other embodiments, the value of the LC resonant arm Lri1 and the value of Lr1 may be equal or different; the value of the LC resonant arm Cri1 and the value of Cr1 may be equal or different;

[0049] Then, another LC resonant arm Lr2-Cr2 connected in series at the output end of the inverter H bridge S1-S2-S3-S4 is decomposed into n series LC resonant arms Lri2-Cri2 from the circuit topology; wherein Lri2 and Lr2 can be equal or different; Cri2 and Cr2 can be equal or different;

[0050] Then, the output ends of the inverter H-bridge Si1-Si2-Si3-Si4 are connected in series with the LC resonant arm Lri1-Cri1 and the LC resonant arm Lri2-Cri2 respectively to form a new inverter H-bridge LCC resonant circuit unit; from the circuit topology, it is decomposed into n new inverter H-bridge LCC resonant circuit units with the same structure; the n new inverter H-bridge LCC resonant circuit units are driven and operated synchronously;

[0051] Step 2: setting the gating and cutting devices of the inverter H-bridge LCC resonant circuit in n new inverter H-bridge LCC resonant circuit units;

[0052] like Figure 2 As shown, the input bus positive terminal of the i-th new inverter H-bridge LCC resonant circuit unit is defined as ini+ and ini-, and the output positive terminal is defined as outi+ and outi-;

[0053] In n new inverter H-bridge LCC resonant circuit units, a fuse i is connected in series to the input bus positive terminal ini+ of the i-th inverter H-bridge LCC resonant circuit; a gate relay Ki is connected in series to the output positive terminal outi+ of the i-th inverter H-bridge LCC resonant circuit; whether the i-th inverter H-bridge LCC resonant circuit outputs is achieved by controlling whether the gate relay Ki is turned on; through the above operation, a fuse is connected in series to the input bus positive terminal of the new inverter H-bridge LCC resonant circuit unit, and a gate relay is connected in series to the output positive terminal;

[0054] Step 3, connecting the input ends of the inverter H-bridge LCC resonant circuits in n new inverter H-bridge LCC resonant circuit units in series for voltage balancing and then connecting them to a high-frequency and high-voltage DC power supply;

[0055] like Figure 3 As shown, the input terminals of the i-th new inverter H-bridge LCC resonant circuit unit are defined as ini+ and ini- respectively;

[0056] The i-th filter capacitor C0i is connected in parallel between the input terminals ini+ and ini- of the i-th inverter H-bridge LCC resonant circuit unit of the new inverter H-bridge LCC resonant circuit unit; wherein, C01=C02=...=C0i=...=C0n; according to the above operation, n filter capacitors are connected in parallel to the input terminal of the new inverter H-bridge LCC resonant circuit unit; C01, ..., C0i, ..., C0n are then connected in series in sequence, the positive terminal of C01 is connected to the total positive power input of the high-frequency high-voltage DC power supply, and the negative terminal of C0n is connected to the total negative power input of the high-frequency high-voltage DC power supply;

[0057] Step 4: connect the output ends of the inverter H-bridge LCC resonant circuits in n new inverter H-bridge LCC resonant circuit units in parallel and connect them to the high-frequency transformer of the high-voltage DC power supply to complete the high-frequency and high-voltage DC power supply inverter LCC resonant charging circuit topology.

[0058] like Figure 4 As shown, the output terminals of the i-th new inverter H-bridge LCC resonant circuit unit are defined as outi+ and outi-; the equivalent parallel resonant capacitor of the primary input terminal of the high-frequency transformer of the high-voltage DC power supply is Cp;

[0059] The output ends outi+ and outi- of the i-th new inverter H-bridge LCC resonant circuit unit are respectively connected to the equivalent parallel resonant capacitor Cp+ and the equivalent parallel resonant capacitor Cp- for parallel convergence; through the above operation, the output ends of the n-way new inverter H-bridge LCC resonant circuit units are respectively connected in parallel to the two ends of the equivalent parallel resonant capacitor Cp to complete the high-frequency and high-voltage DC power supply inverter LCC resonant charging circuit topology.

[0060] In this embodiment, a single-module inverter H-bridge LCC resonant circuit (i.e., an original inverter H-bridge LCC resonant circuit unit) with a rated withstand voltage of DC100V in an existing high-voltage DC power supply is processed according to the method of the present invention, as follows:

[0061] (1) Decompose the original inverter H-bridge LCC resonant circuit unit into three modules;

[0062] The inverter H bridge S1-S2-S3-S4 in the existing original inverter H bridge LCC resonant circuit unit is decomposed into three identical inverter H bridges Si1-Si2-Si3-Si4 from the circuit topology, where i=1, 2, 3;

[0063] One of the LC resonant arms Lr1-Cr1 connected in series at the output end of the existing inverter H-bridge S1-S2-S3-S4 is decomposed into three identical series LC resonant arms Lri1-Cri1 from the circuit topology, where i=1, 2, 3, and Lr11=Lr21=Lr31, Cr11=Cr21=Cr31;

[0064] Another series LC resonant arm Lr2-Cr2 connected in series at the output end of the existing inverter H bridge S1-S2-S3-S4 is decomposed into three identical series LC resonant arms Lri2-Cri2 from the circuit topology, where i=1, 2, 3, and Lr12=Lr22=Lr32, Cr12=Cr22=Cr32;

[0065] The two lines at the output end of the inverter H-bridge Si1-Si2-Si3-Si4 are connected in series with the LC resonant arm Lri1-Cri1 and the LC resonant arm Lri2-Cri2 respectively to form a new inverter H-bridge LCC resonant circuit unit; according to this rule, the original inverter H-bridge LCC resonant circuit unit is composed of a total of three identical new inverter H-bridge LCC resonant circuit units from the circuit topology; the three new inverter H-bridge LCC resonant circuit units are driven and operated synchronously;

[0066] (2) Setting the gating and disconnection of three new inverter H-bridge LCC resonant circuit units;

[0067] In the inverter H-bridge LCC resonant circuit of the three new inverter H-bridge LCC resonant circuit units, a fuse i is connected in series to the input bus positive terminal ini+ of the i-th inverter H-bridge LCC resonant circuit module, where i=1, 2, 3; a gate relay Ki is connected in series to the output positive terminal outi+ of the i-th inverter H-bridge LCC resonant circuit, and Ki is closed; whether the i-th inverter H-bridge LCC resonant circuit outputs is achieved by controlling whether the gate relay Ki is turned on;

[0068] If the i-th inverter H-bridge has a short-circuit fault, the fuse i will be quickly disconnected, cutting off the power input terminal ini+ high-voltage bus from the i-th inverter H-bridge with the short-circuit fault, thus protecting the power input bus without affecting the normal operation of the other n-1 inverter H-bridge LCC resonant circuits.

[0069] (3) connecting the input ends of three new inverter H-bridge LCC resonant circuit units in series for voltage balancing;

[0070] In the inverter H-bridge LCC resonant circuit of the three new inverter H-bridge LCC resonant circuit units, the i-th filter capacitor C0i is connected in parallel between the input terminals ini+ and ini- of the i-th inverter H-bridge LCC resonant circuit; wherein C0i=50nF, i=1, 2, 3; the filter capacitors C01, C02, and C03 are connected in series in sequence, the positive end of the filter capacitor C01 is connected to the total positive power input of the high-frequency high-voltage DC power supply, and the negative end of the filter capacitor C03 is connected to the total negative power input of the high-frequency high-voltage DC power supply;

[0071] (4) connecting the output ends of the three new inverter H-bridge LCC resonant circuit units in parallel;

[0072] In the inverter H-bridge LCC resonant circuit of the three new inverter H-bridge LCC resonant circuit units, the output ends outi+ and outi- of the i-th inverter H-bridge LCC resonant circuit are connected to the primary parallel resonant capacitor Cp+ of the high-frequency transformer of the high-voltage DC power supply and the primary parallel resonant capacitor Cp- of the high-frequency transformer of the high-voltage DC power supply, respectively; finally, the output ends of the three inverter H-bridge LCC resonant circuit units are all connected in parallel to the two ends of the primary parallel resonant capacitor Cp of the high-frequency transformer of the high-voltage DC power supply.

[0073] In this embodiment, the voltage between the total positive input and the total negative input of the high-voltage DC power supply subjected to the above treatment is increased from the original DC100V to DC300V, and the test is carried out under the condition that the other conditions remain unchanged. The test results show that: the three-way inverter H-bridge LCC resonant circuit with series voltage balancing at the input end and parallel convergence at the output end operates normally, and the input bus voltage is increased by 2 times; the voltage amplitude across the primary parallel resonant capacitor Cp of the high-frequency transformer of the high-voltage DC power supply is increased by about 2 times compared with the original inverter H-bridge LCC resonant circuit feeding situation; under the same operating time and the same load capacitance, the DC voltage amplitude output by the rectifier bridge at the secondary end of the high-frequency transformer of the high-voltage DC power supply is increased by about 2 times compared with the original inverter H-bridge LCC resonant circuit feeding situation, and the charging power output to the same load is increased by about 2 times.

[0074] The test results prove that the method of the present invention solves the problem of a substantial reduction in the power input bus voltage and power due to insufficient voltage resistance and radiation resistance of semiconductor switching devices under special environments such as high voltage and radiation, and each inverter H-bridge LCC resonant circuit can be freely connected and disconnected and back up each other, thus solving the problem of power supply safety and reliability.

[0075] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A high-frequency and high-voltage DC power supply inverter LCC resonant charging circuit topology method, characterized in that: The following steps are involved: 1] Decompose the original inverter H-bridge LCC resonant circuit unit into n new inverter H-bridge LCC resonant circuit units from the circuit topology; n is an integer, and n≥2; 2] Setting the gating and cutting devices of the inverter H-bridge LCC resonant circuit in n new inverter H-bridge LCC resonant circuit units; 3] Connect the input ends of the inverter H-bridge LCC resonant circuits in n new inverter H-bridge LCC resonant circuit units in series and then connect them to a high-frequency and high-voltage DC power supply; 4] The output ends of the inverter H-bridge LCC resonant circuits in the n new inverter H-bridge LCC resonant circuit units are connected in parallel and then connected to the high-frequency transformer of the high-voltage DC power supply to complete the high-frequency and high-voltage DC power supply inverter LCC resonant charging circuit topology.

2. According to the high-frequency and high-voltage direct current power supply inverter LCC resonant charging circuit topology method of claim 1, it is characterized in that: Step 1 is as follows: 1.

1. Determine the original inverter H-bridge LCC resonant circuit unit; The original inverter H-bridge LCC resonant circuit unit includes an inverter H-bridge S1-S2-S3-S4, an LC resonant arm Lr1-Cr1 and an LC resonant arm Lr2-Cr2; 1.

2. Decompose the inverter H bridge S1-S2-S3-S4 into n inverter H bridges Si1-Si2-Si3-Si4 with the same structure from the circuit topology, i=1,...,n; 1.

3. Decompose the LC resonant arm Lr1-Cr1 into n LC resonant arms Lri1-Cri1 from the circuit topology; 1.

4. Decompose the LC resonant arm Lr2-Cr2 into n LC resonant arms Lri2-Cri2 from the circuit topology; 1.

5. Connect the two output ends of the inverter H bridge Si1-Si2-Si3-Si4 to the corresponding LC resonant arms Lri1-Cri1 and Lri2-Cri2 respectively to form n new inverter H bridge LCC resonant circuit units.

3. According to claim 2, a high-frequency and high-voltage DC power supply inverter LCC resonant charging circuit topology method is characterized in that: Step 2 is as follows: 2.

1. Connect fuses in series at the positive ends of the input busbars of the n-way new inverter H-bridge LCC resonant circuit units, respectively, to provide overcurrent protection for the corresponding new inverter H-bridge LCC resonant circuit units; 2.

2. The output positive ends of the n new inverter H-bridge LCC resonant circuit units are respectively connected in series with a gate relay Ki to control the gate and cutoff of the corresponding new inverter H-bridge LCC resonant circuit unit.

4. According to the high-frequency and high-voltage direct current power supply inverter LCC resonant charging circuit topology method of claim 3, it is characterized in that: Step 3 is as follows: 3.

1. Connect filter capacitors C01, ..., C0n in parallel between the input high end and input low end of n new inverter H-bridge LCC resonant circuit units; 3.

2. Connect n filter capacitors C01, ..., C0n in series to balance the voltage; 3.

3. Connect the high end of the filter capacitor C01 in series to the total positive input of the high-frequency and high-voltage DC power supply, and connect the low end of the filter capacitor C0n to the total negative input of the high-frequency and high-voltage DC power supply.

5. According to the high-frequency and high-voltage direct current power supply inverter LCC resonant charging circuit topology method of claim 4, it is characterized in that: Step 4 is as follows: Define the equivalent parallel resonant capacitance at the primary input of the high-frequency transformer of the high-voltage DC power supply as Cp; The output high voltage end and the output low voltage end of the n-way new inverter H-bridge LCC resonant circuit unit are respectively connected in parallel to the equivalent parallel resonant capacitor Cp at the primary input end of the high-frequency transformer of the high-voltage DC power supply, completing the high-frequency and high-voltage DC power supply inverter LCC resonant charging circuit topology.

6. According to claim 5, a high-frequency and high-voltage direct current power supply inverter LCC resonant charging circuit topology method is characterized in that: In step 1.3, the Lri1 value in the LC resonant arm is equal to or unequal to the Lr1 value in the LC resonant arm; The Cri1 value in the LC resonance arm is equal to or unequal to the Cr1 value in the LC resonance arm.

7. According to claim 5, a high-frequency and high-voltage DC power supply inverter LCC resonant charging circuit topology method is characterized by: In step 1.4, the Lri2 value in the LC resonant arm is equal to or unequal to the Lr2 value in the LC resonant arm; The Cri2 value in the LC resonance arm is equal to or unequal to the Cr2 value in the LC resonance arm.

8. According to claim 5, a high-frequency and high-voltage direct current power supply inverter LCC resonant charging circuit topology method is characterized by: In step 3.3, the values ​​of the n filter capacitors C01, ..., C0i, ..., C0n are equal.

9. According to claim 5, a high-frequency and high-voltage direct current power supply inverter LCC resonant charging circuit topology method is characterized by: In step 3.3, the Coi=50nF.

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