A wide voltage self-powered high-voltage power module

Abstract

The application discloses a wide-voltage self-powered high-voltage power module, and relates to the technical field of power electronics, which solves the problem that the control and measurement signals of a traditional high-voltage power module are powered by AC 220V mains and require multiple isolation transformers, and the technical scheme is as follows: a main circuit comprises a fuse, a protection circuit, a soft-starting circuit, a rectifier bridge, a supporting filter capacitor, a freewheeling diode, a bleeder circuit and an IGBT; an auxiliary circuit comprises an auxiliary power supply circuit and a control circuit, the input end of the auxiliary power supply circuit is connected with the supporting filter capacitor, the output end is connected with the control circuit, and the output end of the control circuit is connected with the gate of the soft-starting circuit, the bleeder circuit and the IGBT; the auxiliary power supply circuit is added in the auxiliary circuit, special self-powered design is adopted to supply power for the control and measurement signals of the high-voltage power module, and the traditional mains auxiliary power supply structure is replaced, so that the use of auxiliary power supply transformers can be greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of power electronics technology, and more specifically, to a wide-voltage self-powered high-voltage power supply module. Background Technology

[0002] Magnetic confinement fusion is an important method for achieving fusion reactions. The HL-2M device is my country's next-generation magnetic confinement fusion device. To further improve the operating parameters of the HL-2M device and enhance the stability and heating power of the plasma during operation, a low-hybrid wave heating system, an electron cyclotron heating system, and a neutral beam injection heating system are required. The neutral beam injection heating system generates a high-voltage electrostatic field at the accelerator pole, forming a high-current ion beam, which requires a high-voltage, high-power power supply. The high-voltage power supply converts AC to DC through rectification to supply the neutral beam injection heating system. As the requirements for the high-voltage power supply of the neutral beam injection heating system continue to increase, especially the output voltage level of the high-voltage power supply module, the auxiliary power supply isolation voltage level of the original high-voltage power supply module will also need to be increased, significantly increasing the manufacturing difficulty.

[0003] Traditional high-voltage power supply modules use AC 220V mains power for control and measurement signals via high-voltage isolation level transformers. Each high-voltage power supply requires multiple high-voltage isolation level transformers, and each transformer's primary side also needs a transformer of the corresponding isolation level to ensure voltage isolation within each group. As the voltage level of high-voltage power supplies increases, the isolation level of auxiliary power supply transformers also needs to be continuously improved. This will increase manufacturing difficulty and the number of transformers required, thus increasing construction costs.

[0004] In view of this, a high-voltage power supply module with wide voltage self-powering is proposed to solve the existing problems. Summary of the Invention

[0005] The purpose of this application is to provide a high-voltage power supply module with wide voltage self-powering capability. By adding an auxiliary power supply circuit in the auxiliary circuit and adopting a special self-powering design to supply power to the control and measurement signals of the high-voltage power supply module, the traditional mains auxiliary power supply structure can be replaced, which can significantly reduce the use of auxiliary power supply transformers.

[0006] The above-mentioned technical objective of this application is achieved through the following technical solution: including a main circuit and an auxiliary circuit; The main circuit includes a fuse, a protection circuit, a soft-start circuit, a rectifier bridge, a supporting filter capacitor, a freewheeling diode, a bleeder circuit, and an IGBT. One end of the single-phase AC is connected to the first input terminal of the rectifier bridge through the fuse and the soft-start circuit. The fuse is connected in parallel with the protection circuit. The other end of the single-phase AC is directly connected to the second input terminal of the rectifier bridge. The two output terminals of the rectifier bridge are connected to the two ends of the supporting filter capacitor. The two ends of the supporting filter capacitor are connected in parallel with the bleeder circuit. The first end of the supporting filter capacitor is connected to the positive output terminal. The second end of the supporting filter capacitor is connected to the emitter of the IGBT. The collector of the IGBT is connected to the negative output terminal. The positive and negative output terminals are connected to the freewheeling diode. The auxiliary circuit includes an auxiliary power supply circuit and a control circuit. The input terminal of the auxiliary power supply circuit is connected to the supporting filter capacitor, and the output terminal is connected to the control circuit. The output terminal of the control circuit is connected to the soft-start circuit, the discharge circuit, and the gate of the IGBT.

[0007] By adopting the above technical solution, the voltage across the supporting filter capacitor is collected through the auxiliary power supply circuit to power the control circuit; there is no need for AC220V mains power to power the module's control and measurement. The module's control and measurement power is taken from both ends of the supporting filter capacitor in the main circuit, thus ensuring that there is no high potential between the power module's control and measurement and the DC output voltage. Therefore, a high-isolation transformer is not required, achieving economic efficiency in the construction of the high-voltage power supply system. In addition, the addition of a discharge circuit to the main circuit enables rapid and safe discharge of the supporting filter capacitor when the control is not energized and the module is not charging, ensuring personnel safety.

[0008] As one possible implementation, the auxiliary power supply circuit includes: a filter capacitor, a first varistor, a voltage divider capacitor circuit, a high-voltage DC relay, a voltage divider resistor circuit, a voltage regulator circuit, and a voltage regulator module; The filter capacitor is connected in parallel with the supporting filter capacitor, and the filter capacitor is connected in parallel with the voltage divider capacitor circuit and the voltage divider resistor circuit respectively; The first varistor is connected in parallel with the lower end of the voltage divider capacitor circuit, and the voltage regulator circuit is connected in parallel with the lower end of the voltage divider resistor circuit. The upper end of the voltage divider capacitor circuit is connected in parallel with the switch of the high-voltage DC relay, and the lower end is connected in parallel with the voltage regulator module. The power supply terminal of the high-voltage DC relay is connected in parallel with the lower end of the voltage divider resistor circuit. The voltage regulator module is used to connect the control circuit for power supply.

[0009] As one possible implementation, when the voltage of the supporting filter capacitor is less than a threshold, the switch of the high-voltage DC relay is closed, and the voltage of the supporting filter capacitor is connected to the voltage regulator module through the high-voltage DC relay and the lower end of the voltage divider capacitor circuit.

[0010] As one possible implementation, when the voltage of the supporting filter capacitor is greater than a threshold, the switch of the high-voltage DC relay is turned off, and the voltage of the supporting filter capacitor is connected to the voltage regulator module after being divided by the voltage divider capacitor circuit.

[0011] As one possible implementation, the discharge circuit includes a discharge resistor and a discharge controller connected in series.

[0012] As one possible implementation, the soft-start circuit includes a soft-start contactor, a soft-start resistor, and a direct contactor, wherein the soft-start contactor and the soft-start resistor are connected in series and then in parallel with the direct contactor.

[0013] In one possible implementation, the output of the control circuit is connected to the direct contactor and the soft start contactor in the soft start circuit, and the output of the control circuit is also connected to the discharge controller.

[0014] As one possible implementation, the protection circuit includes a current-limiting resistor and a light-emitting diode connected in series.

[0015] As one possible implementation, the voltage divider capacitor circuit includes an upper voltage divider capacitor and a lower voltage divider capacitor, wherein the upper voltage divider capacitor is the upper end of the voltage divider capacitor circuit and the lower voltage divider capacitor is the lower end of the voltage divider capacitor circuit. The voltage divider resistor circuit includes an upper voltage divider resistor and a lower voltage divider resistor. The upper voltage divider resistor is the upper end of the voltage divider resistor circuit, and the lower voltage divider resistor is the lower end of the voltage divider resistor circuit.

[0016] As one possible implementation, the voltage regulator circuit includes a Zener diode and a second varistor connected in parallel.

[0017] Compared with the prior art, this application has the following advantages: On the one hand, by adding an auxiliary power supply circuit in the auxiliary circuit and adopting a special self-powered design to supply power to the control and measurement signals of the high-voltage power module, replacing the traditional mains auxiliary power supply structure, the use of auxiliary power supply transformers can be greatly reduced; on the other hand, the auxiliary power supply circuit is specially designed, using a voltage regulator module and capacitor voltage divider, and DC relay connected in series, to achieve stable power supply to the control circuit within a wide voltage fluctuation range; in addition, a discharge circuit supporting the filter capacitor is added to the main circuit, which can realize the rapid and safe discharge of the capacitor when the control is not energized and the module is not charging, ensuring personnel safety. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and form part of this application, do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the high-voltage power supply module provided by the present invention; Figure 2 A schematic diagram of the main circuit structure of the high-voltage power supply module provided by the present invention; Figure 3 This is a schematic diagram of the auxiliary power supply circuit in the high-voltage power supply module provided by the present invention.

[0019] The attached diagram shows the markings and corresponding component names: 1. Fuse; 2. Current-limiting resistor; 3. Light-emitting diode (LED); 4. Hall effect current sensor; 5. Soft-start contactor; 6. Soft-start resistor; 7. Through contactor; 8. Rectifier bridge; 9. Support filter capacitor; 10. Bleeding resistor; 11. Bleeding controller; 12. IGBT; 13. Freewheeling diode; 14. Auxiliary power supply circuit; 15. Control circuit; 16. Filter capacitor; 17. Upper voltage divider capacitor; 18. Lower voltage divider capacitor; 19. First varistor; 20. High-voltage DC relay; 21. Upper voltage divider resistor; 22. Lower voltage divider resistor; 23. Zener diode; 24. Second varistor; 25. Regulated power supply module. Implementation

[0020] In the following, the terms “comprising” or “may include” as used in the various embodiments of this application indicate the presence of the claimed function, operation, or element, and do not limit the addition of one or more functions, operations, or elements. Furthermore, as used in the various embodiments of this application, the terms “comprising,” “having,” and their cognates are intended only to indicate a specific feature, number, step, operation, element, component, or combination of the foregoing, and should not be construed as primarily excluding the presence of one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing, or the possibility of adding one or more combinations of the foregoing.

[0021] It should be noted that if a description refers to "connecting" a component to another component or "connecting" it to another component, then the first component can be directly connected to the second component, and a third component can be "connected" between the first and second components. Conversely, when a component is "directly connected" to another component or "directly connected" to another component, it can be understood that there is no third component between the first and second components.

[0022] The terminology used in the various embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the various embodiments of this application. Unless otherwise specified, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which the various embodiments of this application pertain. The terms (such as those defined in a generally used dictionary) are to be interpreted as having the same meaning as in the context of the relevant technical field and are not to be interpreted as having an idealized or overly formal meaning, unless clearly defined in the various embodiments of this application.

[0023] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this application are only for explaining this application and are not intended to limit this application.

[0024] The control and measurement signals of existing high-voltage power supply modules are mainly supplied by AC 220V mains power through high-voltage isolation level transformers. Each high-voltage power supply requires multiple high-voltage isolation level transformers, and each transformer's primary side also needs to be equipped with a transformer of the corresponding isolation level to ensure voltage isolation within each group. As the voltage level of high-voltage power supplies increases, the isolation level of transformers also continuously increases, leading to increased manufacturing difficulty and operating costs.

[0025] Therefore, this application provides a high-voltage power supply module with wide voltage self-powering capability. It achieves power supply for control and measurement signals of the high-voltage power supply module by self-powering through an auxiliary power supply circuit, eliminating the need for a high-isolation transformer to collect AC220V AC mains power for control and measurement signals, reducing manufacturing difficulty and usage costs, and possessing good application value.

[0026] Please see Figure 1 As shown, Figure 1This is a schematic diagram of a high-voltage power supply module. The high-voltage power supply module includes a main circuit and an auxiliary circuit. The main circuit includes a fuse, a protection circuit, a soft-start circuit, a rectifier bridge, a supporting filter capacitor, a freewheeling diode, a bleeder circuit, and an IGBT. One end of the single-phase AC is connected to the first input terminal of the rectifier bridge through the fuse and the soft-start circuit. The fuse is connected in parallel with the protection circuit. The other end of the single-phase AC is directly connected to the second input terminal of the rectifier bridge. The two output terminals of the rectifier bridge are connected to the two ends of the supporting filter capacitor. The two ends of the supporting filter capacitor are connected in parallel with the bleeder circuit. The first end of the supporting filter capacitor is connected to the positive output terminal, and the second end of the supporting filter capacitor is connected to the emitter of the IGBT. The collector of the IGBT is connected to the negative output terminal, and the positive and negative output terminals are connected to the freewheeling diode. The auxiliary circuit includes an auxiliary power supply circuit and a control circuit. The input terminal of the auxiliary power supply circuit is connected to the supporting filter capacitor, and the output terminal is connected to the control circuit. The output terminal of the control circuit is connected to the soft-start circuit, the bleeder circuit, and the gate of the IGBT.

[0027] Specifically, the high-voltage power supply module uses single-phase AC as the main circuit power supply, while the auxiliary circuit draws power from the main circuit. When there is AC input, the soft-start circuit is closed, and the AC power is converted into DC power through a rectifier bridge. After passing through a support filter capacitor to reduce harmonic components, a DC voltage is finally obtained across the support filter capacitor. The voltage across the support filter capacitor is then converted into a stable DC voltage by the auxiliary power supply circuit to power the control circuit. The control circuit adjusts the on / off and modulation of the power module output by controlling the duty cycle of the IGBTs.

[0028] It should be noted that in actual operation, the AC side voltage of the high-voltage power supply module comes from a pulse generator, and the output voltage of the pulse generator is not necessarily constant. During power supply, as the AC side voltage changes, the DC voltage across the supporting filter capacitor will also change accordingly. The control circuit typically uses ±5V, 12V, 24V, etc. Therefore, the DC voltage taken from the supporting filter capacitor needs to pass through an auxiliary power supply circuit to stabilize the DC voltage across the main circuit's supporting filter capacitor within a small fluctuation range, thereby achieving self-powering for control and measurement over a wide voltage range.

[0029] In one possible embodiment, the auxiliary power supply circuit includes: a filter capacitor, a first varistor, a voltage divider capacitor circuit, a high-voltage DC relay, a voltage divider resistor circuit, a voltage regulator circuit, and a voltage regulator module; the filter capacitor is connected in parallel with the supporting filter capacitor, and the filter capacitor is connected in parallel with both the voltage divider capacitor circuit and the voltage divider resistor circuit; the first varistor is connected in parallel with the lower end of the voltage divider capacitor circuit, and the voltage regulator circuit is connected in parallel with the lower end of the voltage divider resistor circuit; the upper end of the voltage divider capacitor circuit is connected in parallel with the switch of the high-voltage DC relay, and the lower end is connected in parallel with the voltage regulator module; the power supply terminal of the high-voltage DC relay is connected in parallel with the lower end of the voltage divider resistor circuit; the voltage regulator module is used to connect to the control circuit for power supply.

[0030] Specifically, the auxiliary power supply circuit converts the voltage across the supporting filter capacitor into the DC power supply voltage required by the control circuit through the voltage regulator module, operating within a wide AC voltage fluctuation range. The high-voltage DC relay in the auxiliary power supply circuit activates when the voltage across the supporting filter capacitor exceeds a certain level, thereby achieving capacitor voltage division and ensuring the safety and reliability of the voltage regulator module. The auxiliary power supply circuit delivers the voltage across the supporting filter capacitor to the voltage regulator module after voltage division. The first varistor in the auxiliary power supply circuit protects the voltage regulator in case of overvoltage. The voltage regulator module outputs a stable DC voltage from the voltage across the supporting filter capacitor, supplying it to the control circuit. The control circuit controls the operation of the IGBTs and related components within the power module to achieve the output and protection of the high-voltage power module.

[0031] It should be noted that the high-voltage DC power is rectified from AC60V to AC800V, and the peak voltage of the supporting filter capacitor after rectification is between 84.84V and 1131.2V. Due to the wide voltage range of the capacitor, this example uses a voltage regulator module connected in series with a capacitor voltage divider and a DC relay to achieve self-powering for control and measurement over a wide voltage range.

[0032] In one possible embodiment, when the voltage of the supporting filter capacitor is less than a threshold, the switch of the high-voltage DC relay is closed, and the voltage of the supporting filter capacitor is connected to the regulated power supply module via the high-voltage DC relay and the lower end of the voltage divider capacitor circuit. When the voltage of the supporting filter capacitor is greater than the threshold, the switch of the high-voltage DC relay is opened, and the voltage of the supporting filter capacitor is connected to the regulated power supply module after being divided by the voltage divider capacitor circuit.

[0033] Specifically, when the voltage of the supporting filter capacitor is less than a certain value, the main contacts of the DC relay are normally closed. At this time, the voltage of the filter capacitor is directly connected to the voltage regulator module, and the voltage regulator module outputs a stable voltage to power the control circuit. When the voltage of the filter capacitor is greater than a certain value, the coil of the DC relay actuates, and the main contacts of the DC relay do not close. At this time, the voltage of the filter capacitor is divided by the capacitor to power the voltage regulator module.

[0034] In one possible embodiment, the discharge circuit includes a discharge resistor and a discharge controller connected in series. During periods when the high-voltage power module is not charging or supplying power, the energy stored in the supporting filter capacitor is automatically and safely discharged during non-operational times, ensuring the safety of experimental personnel.

[0035] In one possible embodiment, the soft-start circuit includes a soft-start contactor, a soft-start resistor, and a direct-connect contactor. The soft-start contactor and the soft-start resistor are connected in series, and then connected in parallel with the direct-connect contactor. The soft-start circuit utilizes the series and parallel connection of resistors to limit current during the start-up process. After the soft start is complete, the resistor loop is removed from the circuit, which can effectively prevent the power module from impacting the power grid during startup.

[0036] In one possible embodiment, the output terminal of the control circuit is connected to the through contactor and the soft start contactor in the soft start circuit, and the output terminal of the control circuit is also connected to the discharge controller. The control circuit controls the opening and closing of the through contactor and the soft start contactor in the soft start circuit to achieve startup control of the high-voltage power module. The control circuit controls the opening and closing of the discharge controller to achieve protection of the high-voltage power module.

[0037] In one possible embodiment, the protection circuit includes a current-limiting resistor and a light-emitting diode (LED) connected in series. The current-limiting resistor and LED, in conjunction with a fuse, ensure the safe operation of the high-voltage power module. When the AC side current is normal, the LED does not light, indicating that the fuse is functioning normally. When the current in the circuit exceeds a specified value, the fuse, along with the heat generated by itself, melts the circuit, at which point the LED lights up.

[0038] In one possible embodiment, the voltage divider capacitor circuit includes an upper voltage divider capacitor and a lower voltage divider capacitor, wherein the upper voltage divider capacitor is the upper end of the voltage divider capacitor circuit and the lower voltage divider capacitor is the lower end of the voltage divider capacitor circuit. The voltage divider resistor circuit includes an upper voltage divider resistor and a lower voltage divider resistor. The upper voltage divider resistor is the upper end of the voltage divider resistor circuit, and the lower voltage divider resistor is the lower end of the voltage divider resistor circuit.

[0039] In one possible embodiment, the voltage regulator circuit includes a Zener diode and a second varistor connected in parallel.

[0040] Understandably, this example only requires power to the main circuit of the high-voltage power module, eliminating the need for AC220V mains power to power the module's control and measurement. The control and measurement power for the high-voltage power module is drawn from the two ends of the supporting filter capacitor, ensuring that there is no high potential between the control and measurement voltages and the DC output voltage. Therefore, a high-isolation transformer is unnecessary, achieving economic efficiency in the construction of the high-voltage power module.

[0041] The above embodiments illustrate the structure and principle of a wide-voltage self-powered high-voltage power supply module provided by the present invention. In order to facilitate those skilled in the art to better understand and implement the high-voltage power supply module provided by the present invention, the specific implementation circuit of the high-voltage power supply module will be further described below.

[0042] Please see Figure 2 As shown, Figure 2 This is a schematic diagram of the main circuit structure of the high-voltage power supply module. In the main circuit, the first terminal of the single-phase AC is connected to the first terminal of the fuse 1. The current-limiting resistor 2 and the LED 3 are connected in series and then in parallel with the fuse 1. This ensures that the LED 3 does not light up during normal operation of the high-voltage power supply module, and lights up after the overcurrent protection fuse 1 of the power supply module trips. The second terminal of the fuse 1 is connected to the first terminal of the direct-connect contactor 7. The soft-start contactor 5 and the soft-start resistor 6 are connected in series and then in parallel with the direct-connect contactor 7. When AC power is applied, the soft-start contactor 5 is closed first, and the supporting filter capacitor 9 is charged through the soft-start resistor 6. When the capacitor voltage reaches a set value, the direct-connect contactor is closed, allowing AC to directly charge the supporting filter capacitor 9. A Hall current sensor 4 is fitted on the connection line between the fuse 1 and the direct-connect contactor 7 to measure and transmit the AC current. The second end of the direct contactor 7 is connected to the first input end of the rectifier bridge 8, and the second end of the single-phase AC is connected to the second input end of the rectifier bridge 8; the two output ends of the rectifier bridge 8 are connected in parallel with the two ends of the supporting filter capacitor 9 to rectify the AC voltage and output DC voltage.

[0043] The discharge resistor 10 and the discharge controller 11 are connected in series and then in parallel across the supporting filter capacitor 9. During periods when the module is not charging or powered, rapid and safe discharge is achieved automatically during non-operational times. After the soft-start is closed, the module enters the charging state and stops discharging the energy stored in the capacitor. The first output of the rectifier bridge 8 is connected to the positive output terminal, the second output of the rectifier bridge 8 is connected to the emitter of the IGBT 12, and the collector of the IGBT 12 is connected to the negative output terminal. The output voltage is controlled by controlling the gate of the IGBT 12. The input voltage of the auxiliary power supply circuit 14 is taken from both ends of the supporting filter capacitor. The output voltage of the auxiliary power supply circuit 14 supplies the control circuit 15. The output signal of the control circuit 15 controls the on / off state of the IGBT 12, as well as the operation of various contactors and controllers. The positive and negative output terminals are connected to the freewheeling diode 13, forming a loop to release the energy of the load.

[0044] Please see Figure 3 As shown, Figure 3 This is a schematic diagram of the auxiliary power supply circuit. In the auxiliary power supply circuit, the voltage is taken from the supporting filter capacitor 9 of the main circuit. The filter capacitor 16 is connected in parallel with the supporting filter capacitor 9 to filter the voltage. The upper voltage divider capacitor 17 and the lower voltage divider capacitor 18 are connected in series and then in parallel across the filter capacitor 16. The first varistor 19 is connected in parallel with the lower voltage divider capacitor 18. The upper voltage divider resistor 21 and the lower voltage divider resistor 22 are connected in series and then in parallel across the filter capacitor 16. The Zener diode 23 and the second varistor 24 are connected in parallel and then in parallel with the lower voltage divider resistor 22, forming protection for the circuit. The switching terminal of the high-voltage DC relay 20 is connected in parallel with the upper voltage divider capacitor 17, and the power supply terminal of the high-voltage DC relay 20 is connected in parallel with the lower voltage divider resistor 22. The input voltage of the voltage regulator module 25 is taken from the lower voltage divider capacitor 18, and the output terminal is connected to the control circuit 15 to provide the required DC voltage for the control circuit 15.

[0045] The following explains how to pass Figure 3 The auxiliary power supply circuit described herein provides power to the control circuit within a wide voltage variation range.

[0046] When the voltage of the supporting filter capacitor 9 is detected to be less than a certain value, the high-voltage DC relay 20 does not operate and remains normally closed. The voltage of the lower voltage divider capacitor 18 is the same as the voltage of the supporting filter capacitor 9, and the voltage of the supporting filter capacitor is sent to the voltage regulator module 25. When the voltage of the supporting filter capacitor 9 is detected to be greater than a certain value, the high-voltage DC relay 20 operates and disconnects. After voltage division by the upper voltage divider resistor 21 and the lower voltage divider resistor 22, the voltage of the lower voltage divider resistor 22 is obtained. At this time, the voltage of the lower voltage divider resistor 22 reaches the operating voltage of the high-voltage DC relay coil, and the high-voltage DC relay 20 operates. After operation, the voltage of the filter capacitor 16 is divided by the upper voltage divider capacitor 17 and the lower voltage divider capacitor 18, and the voltage of the lower voltage divider capacitor 18 is sent to the voltage regulator module 25. The coil of the high-voltage DC relay 20 is kept in a safe state by the Zener diode 23 and the second varistor 24, and the voltage regulator module 25 is kept below the maximum voltage by the first varistor 19. This allows the control circuit 15 to be supplied with a stable DC power supply even when the AC voltage in the main circuit varies from AC60V to AC800V.

[0047] Understandably, the wide-voltage self-powered high-voltage power supply module provided in this application, on the one hand, adds an auxiliary power supply circuit to achieve stable power supply to the control circuit within a wide voltage fluctuation range, reducing the auxiliary isolation transformer of the high-voltage power supply module and making the power supply module lighter and more economical; on the other hand, it adds a discharge circuit supporting the filter capacitor in the main circuit, which can realize the rapid and safe discharge of the capacitor when the control is not energized and the module is not charging, ensuring personnel safety.

[0048] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A high-voltage power supply module with wide voltage self-powering capability, characterized in that: Includes main circuit and auxiliary circuit; The main circuit includes a fuse, a protection circuit, a soft-start circuit, a rectifier bridge, a supporting filter capacitor, a bleeder circuit, a freewheeling diode, and an IGBT. One end of the single-phase AC is connected to the first input terminal of the rectifier bridge through the fuse and the soft-start circuit. The fuse is connected in parallel with the protection circuit. The other end of the single-phase AC is directly connected to the second input terminal of the rectifier bridge. The two output terminals of the rectifier bridge are connected to the two ends of the supporting filter capacitor. The two ends of the supporting filter capacitor are connected in parallel with the bleeder circuit. The first end of the supporting filter capacitor is connected to the positive output terminal. The second end of the supporting filter capacitor is connected to the emitter of the IGBT. The collector of the IGBT is connected to the negative output terminal. The positive and negative output terminals are connected to the freewheeling diode. The auxiliary circuit includes an auxiliary power supply circuit and a control circuit. The input terminal of the auxiliary power supply circuit is connected to the supporting filter capacitor, and the output terminal is connected to the control circuit. The output terminal of the control circuit is connected to the soft-start circuit, the discharge circuit, and the gate of the IGBT. The auxiliary power supply circuit includes: a filter capacitor, a first varistor, a voltage divider capacitor circuit, a high-voltage DC relay, a voltage divider resistor circuit, a voltage regulator circuit, and a voltage regulator module. The filter capacitor is connected in parallel with the supporting filter capacitor, and the filter capacitor is connected in parallel with the voltage divider capacitor circuit and the voltage divider resistor circuit respectively; The first varistor is connected in parallel with the lower end of the voltage divider capacitor circuit, and the voltage regulator circuit is connected in parallel with the lower end of the voltage divider resistor circuit. The upper end of the voltage divider capacitor circuit is connected in parallel with the switch of the high-voltage DC relay, and the lower end is connected in parallel with the voltage regulator module. The power supply terminal of the high-voltage DC relay is connected in parallel with the lower end of the voltage divider resistor circuit. The voltage regulator module is used to connect the control circuit for power supply.

2. The high-voltage power supply module with wide voltage self-powering as described in claim 1, characterized in that: When the voltage of the supporting filter capacitor is less than the threshold, the switch of the high-voltage DC relay is closed, and the voltage of the supporting filter capacitor is connected to the voltage regulator module through the high-voltage DC relay and the lower end of the voltage divider capacitor circuit.

3. A wide-voltage self-powered high-voltage power supply module according to claim 1 or 2, characterized in that: When the voltage of the supporting filter capacitor is greater than the threshold, the switch of the high-voltage DC relay is turned off, and the voltage of the supporting filter capacitor is connected to the voltage regulator module after being divided by the voltage divider capacitor circuit.

4. The high-voltage power supply module with wide voltage self-powering as described in claim 1, characterized in that: The discharge circuit includes a discharge resistor and a discharge controller connected in series.

5. The wide-voltage self-powered high-voltage power supply module according to claim 4, characterized in that: The soft-start circuit includes a soft-start contactor, a soft-start resistor, and a direct contactor. The soft-start contactor and the soft-start resistor are connected in series and then in parallel with the direct contactor.

6. The wide-voltage self-powered high-voltage power supply module according to claim 5, characterized in that: The output terminal of the control circuit is connected to the through contactor and the soft start contactor in the soft start circuit, and the output terminal of the control circuit is also connected to the discharge controller.

7. The high-voltage power supply module with wide voltage self-powering as described in claim 1, characterized in that: The protection circuit includes a current-limiting resistor and a light-emitting diode connected in series.

8. The high-voltage power supply module with wide voltage self-powering according to claim 1, characterized in that: The voltage divider capacitor circuit includes an upper voltage divider capacitor and a lower voltage divider capacitor. The upper voltage divider capacitor is the upper end of the voltage divider capacitor circuit, and the lower voltage divider capacitor is the lower end of the voltage divider capacitor circuit. The voltage divider resistor circuit includes an upper voltage divider resistor and a lower voltage divider resistor. The upper voltage divider resistor is the upper end of the voltage divider resistor circuit, and the lower voltage divider resistor is the lower end of the voltage divider resistor circuit.

9. A high-voltage power supply module with wide voltage self-powering capability according to claim 1, characterized in that: The voltage regulator circuit includes a Zener diode and a second varistor connected in parallel.

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