Single-supply bipolar pulse power supply topology based on Marx structure

Abstract

The present invention discloses a single-power bipolar pulse power supply topology based on Marx structure, which comprises a DC power supply, a full bridge, a Marx structure, an IGBT S5~S 17 , diodes D1~D7. The present invention proposes a novel modular bipolar pulse power supply based on the Marx dual power generator. This topology utilizes a single power supply to charge multiple capacitors in parallel by controlling the full bridge, so that the capacitors produce different positive and negative polarities, and then connects the capacitors of different polarities in series by controlling the opening and closing of the IGBT, thereby delivering positive or negative pulses to the load. The present invention is based on the Mark circuit and the IGBT stack as the main framework, which solves the shortcomings of the traditional pulse power supply, such as slow charging speed and low pulse repetition rate, and at the same time solves the shortcomings that the traditional pulse power supply can only output positive pulses or negative pulses in the case of a single power supply, but cannot generate positive and negative pulses at the same time.

Description

Technical Field

[0001] The invention belongs to the field of motor control and relates to a bipolar pulse power supply topology, in particular to a single-power bipolar pulse power supply topology based on a Marx structure. Background Art

[0002] In pulse power supply systems, the Mark structure is widely used. Compared with traditional pulse power supplies, the combination of the Mark structure and IGBT makes the pulse power supply have a faster rising edge, lower circuit loss and higher pulse repetition rate.

[0003] Figure 1 It is a traditional Marx circuit, which realizes the functions of parallel charging and series discharge of capacitors, and the Marx structure is highly scalable and can be improved according to different needs. However, the traditional Marx structure has the disadvantages of slow charging speed, large circuit loss, low pulse repetition rate, and can only generate single-direction pulse power supply, which greatly limits the application of pulse power supply. Summary of the invention

[0004] The purpose of the present invention is to provide a single-power bipolar pulse power supply topology based on a Marx structure. The power supply topology solves the shortcomings of the traditional Marx structure, so that the pulse power supply has a faster charging speed, a smaller circuit loss, a higher pulse repetition rate, and can generate positive and negative bidirectional pulse power under the condition of a single power supply, and the diode devices in the circuit do not have to withstand excessive reverse voltage, which not only broadens the application of the pulse power supply, but also protects the devices in the circuit.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] A single-power bipolar pulse power supply topology based on Marx structure, consisting of a DC power supply, a full bridge, a Marx structure, an IGBT S5~ S 17 , diodes D1~D7, where:

[0007] The full bridge is composed of power switch devices S1, S2, S3, and S4. The input of the full bridge is connected to a DC power supply. One output end of the full bridge is connected to the collector of S5, the positive electrode of the diode D1, and the negative electrode of the diode D5. The other output end of the full bridge is connected to the negative electrode of the capacitor C1, S 12 The emitter of S5 is connected to one end of the load, and the emitter of S5 is connected to the positive poles of D2, D3, and D4;

[0008] The collector of S6 is connected to the cathode of diode D1, the emitter of S6 is connected to the emitter of S7, the collector of S7 is connected to the collector of S8, the emitter of S8 is connected to the emitter of S9, and the collector of S9 is connected to S 10The collector, S 10 The emitter is connected to S 11 The emitter, S 11 The collector of the diode D4 is connected to the cathode of the diode, S 12 The emitter of is connected to the negative terminal of capacitor C1, S 12 The collector of the 13 The collector, S 13 The emitter is connected to S 14 The emitter of and the cathode of C3, S 14 The collector of the 15 The collector, S 15 The emitter is connected to S 16 The emitter of and the cathode of C5, S 16 The collector of the 17 The collector, S 17 The emitter of is connected to the negative terminal of capacitor C7 and the other end of the load;

[0009] The cathodes of D1, D2, D3, and D4 are connected to the anodes of capacitors C1, C3, C5, and C7, respectively; the anode of D5 is connected to the cathode of D6 and the emitter of S6, respectively; the anode of D6 is connected to the cathode of D7 and the emitter of S8, respectively; the anode of D7 is connected to the cathode of capacitor C6 and the emitter of S9, respectively. 10 The cathode of C2 is connected to the emitter of S6, and the anode of C2 is connected to S 12 The collector of C4 is connected to the emitter of S8, and the positive terminal of C4 is connected to S 14 The collector of C6 is connected to the negative terminal of S 10 The emitter of C6 is connected to S 16 The collector.

[0010] Compared with the prior art, the present invention has the following advantages:

[0011] 1. The present invention is based on the Mark circuit and the IGBT stack as the main framework, which solves the shortcomings of slow charging speed and low pulse repetition rate of the traditional pulse power supply. At the same time, it solves the shortcomings that the traditional pulse power supply can only output positive pulses or negative pulses but cannot generate positive and negative pulses at the same time in the case of a single power supply.

[0012] 2. The topology proposed in the present invention blocks the circuit by controlling the opening and closing of the IGBT, thereby avoiding short-circuit backflow in the circuit and also avoiding the disadvantage of the diode being subjected to reverse high voltage, thus protecting the working device well.

[0013] 3. The present invention proposes a new modular bipolar pulse power supply based on the Marx dual power generator. The principle of this topology is to use a single power supply to charge multiple capacitors in parallel by controlling the full bridge, so that the capacitors have different positive and negative polarities, and then connect the capacitors of different polarities in series by controlling the opening and closing of the IGBT, so as to transmit positive or negative polarity pulses to the load. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a traditional Marx circuit;

[0015] Figure 2 It is the overall topology of single-power bipolar pulse power supply based on Marx structure;

[0016] Figure 3 Phase 1 for charging the capacitor;

[0017] Figure 4 Phase 2 for charging the capacitor;

[0018] Figure 5 It is the forward discharge stage of the capacitor;

[0019] Figure 6 This is the capacitor reverse discharge stage. DETAILED DESCRIPTION

[0020] The technical solution of the present invention is further described below in conjunction with the accompanying drawings, but is not limited thereto. Any modification or equivalent replacement of the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention should be included in the protection scope of the present invention.

[0021] The present invention provides a single-power bipolar pulse power supply topology based on Marx structure, such as Figure 2 As shown in the figure, this topology is powered by a positive DC power supply and consists of a DC power supply, a full bridge, a Marx structure, and IGBT S5~ S 17 , diodes D1~D7. The full bridge is composed of power switching devices S1, S2, S3, S4. The emitter of S1 and the collector of S3 are connected together to form a bridge arm, and the emitter of S2 and the collector of S4 are connected together to form another bridge arm. The two bridge arms are connected in parallel, the collector of S1 is connected to the collector of S2, and the emitter of S3 is connected to the emitter of S4 to form a full bridge. The collector of the full bridge is connected to the positive terminal of the DC power supply, and the emitter of the full bridge is connected to the negative terminal of the DC power supply. The collector of S6 is connected to the cathode of diode D1, the emitter of S6 is connected to the emitter of S7, the collector of S7 is connected to the collector of S8, the emitter of S8 is connected to the emitter of S9, and the collector of S9 is connected to the cathode of diode D1. 10 The collector, S 10 The emitter is connected to S11 The emitter, S 11 The collector of S is connected to the cathode of diode D4. 12 The emitter of is connected to the negative terminal of capacitor C1, S 12 The collector of the 13 The collector, S 13 The emitter is connected to S 14 The emitter, S 14 The collector of the 15 The collector, S 15 The emitter is connected to S 16 The emitter, S 16 The collector of the 17 The collector, S 17 The emitter of is connected to the negative electrode of capacitor C7. The anodes of diodes D1, D2, D3, and D4 are connected to the emitter of full bridge S2, and the cathodes of D1, D2, D3, and D4 are connected to the anodes of capacitors C1, C3, C5, and C7 respectively. The cathode of diode D5 is connected to the emitter of full bridge S2, the anode of D5 is connected to the cathode of D6 and the emitter of S6 respectively, the anode of D6 is connected to the cathode of D7 and the emitter of S8 respectively, and the anode of D7 is connected to the cathode of capacitor C6 and S 10 The negative terminal of capacitor C2 is connected to the emitter of S6, and the positive terminal of C2 is connected to S 12 The negative terminal of capacitor C4 is connected to the emitter of S8, and the positive terminal of C4 is connected to S 14 The negative terminal of capacitor C6 is connected to S 10 The emitter of C6 is connected to S 16 The collector of the diode. This topology can realize the function of parallel charging and series discharging of capacitors, and has fast charging speed, high pulse repetition rate, and the diode does not need to withstand reverse high voltage, as well as the function of generating positive and negative pulses.

[0022] Charging stage:

[0023] Capacitor charging stage 1 Figure 3 As shown, a 500V positive DC power supply is used. When the circuit is in charging stage 1, switches S1, S4, and S 12 ~S 16 Closed, S5~S 11 , S 17 Open, current flows as Figure 3 As shown. At this time, capacitors C2, C4, and C6 are charged, generating a 500V voltage with positive voltage at the bottom and negative voltage at the top. Diodes D1, D2, and D3 are blocked due to the reverse voltage, so capacitors C1, C3, C5, and C7 cannot be charged.

[0024] Capacitor charging stage 2 Figure 4As shown, a 500V positive DC power supply is used. When the circuit is in charging stage 2, switches S2, S3, S5, and S 12 ~S 17 Closed, S6~S 11 Open, current flows as Figure 4 As shown. At this time, capacitors C1, C3, C5, and C7 are charged, generating a 500V voltage with positive voltage at the top and negative voltage at the bottom. Diode D5 is blocked due to the reverse voltage, so capacitors C2, C4, and C6 cannot be charged.

[0025] Discharge phase:

[0026] Assume that the voltage generated at both ends of the load is positive on the left and negative on the right, which is the forward discharge of the capacitor.

[0027] The capacitor is discharged in the forward phase. Figure 5 When the circuit is in the capacitor forward discharge stage, switches S1~S6 are open, and switches S8, S 10 , S 13 , S 15 , S 17 Open, switch S7, S9, S 11 , S 12 , S 14 , S 16 Closed, the current flows as Figure 5 As shown, at this time, capacitors C2~C7 are in a series discharge state, and the potentials at each point are as follows Figure 5 At this time, a 3000V voltage is generated at both ends of the load, with the left side positive and the right side negative.

[0028] The capacitor reverse discharge stage is as follows Figure 6 When the circuit is in the reverse discharge stage, switches S1~S5 are open, and switches S7, S9, S 11 , S 12 , S 14 , S 16 Open, switch S6, S8, S 10 , S 13 , S 15 , S 17 Closed, the current flows as Figure 6 As shown, at this time, capacitors C1~C6 are in a series discharge state, and the potentials at each point are as follows Figure 6 At this time, a 3000V voltage is generated at both ends of the load, with the left side negative and the right side positive.

Claims

1. A single-power bipolar pulse power supply topology based on Marx structure, characterized in that The topology consists of a DC power supply, a full bridge, a Marx structure, an IGBT S5~ S 17 , diodes D1~D7, where: The full bridge is composed of power switch devices S1, S2, S3, and S4. The input of the full bridge is connected to a DC power supply. One output end of the full bridge is connected to the collector of S5, the positive electrode of the diode D1, and the negative electrode of the diode D5. The other output end of the full bridge is connected to the negative electrode of the capacitor C1, S 12 The emitter of S5 is connected to one end of the load, and the emitter of S5 is connected to the positive poles of D2, D3, and D4; The collector of S6 is connected to the cathode of diode D1, the emitter of S6 is connected to the emitter of S7, the collector of S7 is connected to the collector of S8, the emitter of S8 is connected to the emitter of S9, and the collector of S9 is connected to S 10 The collector, S 10 The emitter is connected to S 11 The emitter, S 11 The collector of the diode D4 is connected to the cathode of the diode, S 12 The emitter of is connected to the negative terminal of capacitor C1, S 12 The collector of the 13 The collector, S 13 The emitter is connected to S 14 The emitter of and the cathode of C3, S 14 The collector of the 15 The collector, S 15 The emitter is connected to S 16 The emitter of and the cathode of C5, S 16 The collector of the 17 The collector, S 17 The emitter of is connected to the negative terminal of capacitor C7 and the other end of the load; The cathodes of D1, D2, D3, and D4 are connected to the anodes of capacitors C1, C3, C5, and C7, respectively; the anode of D5 is connected to the cathode of D6 and the emitter of S6, respectively; the anode of D6 is connected to the cathode of D7 and the emitter of S8, respectively; the anode of D7 is connected to the cathode of capacitor C6 and the emitter of S9, respectively. 10 The cathode of C2 is connected to the emitter of S6, and the anode of C2 is connected to S 12 The collector of C4 is connected to the emitter of S8, and the positive terminal of C4 is connected to S 14 The collector of C6 is connected to the negative terminal of S 10 The emitter of C6 is connected to S 16 The collector.

2. The single-power bipolar pulse power supply topology based on Marx structure according to claim 1 is characterized in that When the power topology is in charging stage 1, S1, S4, S 12 ~S 16 Closed, S5~S 11 , S 17 Turn on, at this time capacitors C2, C4, and C6 are charged, generating a 500V voltage with positive at the bottom and negative at the top.

3. The single-power bipolar pulse power supply topology based on Marx structure according to claim 1 is characterized in that When the power topology is in charging stage 2, S2, S3, S5, S 12 ~S 17 Closed, S6~S 11 Turn on, and capacitors C1, C3, C5, and C7 are charged, generating a 500V voltage with positive top and negative bottom.

4. The single-power bipolar pulse power supply topology based on Marx structure according to claim 1 is characterized in that When the power topology is in the capacitor forward discharge stage, S1~S6 are opened, S8, S 10 , S 13 , S 15 , S 17 Open, S7, S9, S 11 , S 12 , S 14 , S 16 Closed, at this time capacitors C2~C7 are in series discharge state.

5. The single-power bipolar pulse power supply topology based on Marx structure according to claim 1 is characterized in that When the power topology is in the reverse discharge stage, S1~S5 are opened, S7, S9, S 11 , S 12 , S 14 , S 16 Open, S6, S8, S 10 , S 13 , S 15 , S 17 Closed, at this time capacitors C1~C6 are in series discharge state.

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