Hybrid DC circuit breaker structure with low stray inductance and high heat dissipation efficiency

Abstract

A hybrid DC circuit breaker structure with low stray inductance and high heat dissipation efficiency is disclosed. In the structure, the second housing is provided with heat dissipation slots. A fast mechanical switch is fixed to the second housing and a fast mechanical switch drive is fixed to the second housing and connected to the fast mechanical switch to serve as the input interface for opening and closing signals. A current-carrying and heat-dissipating integrated copper busbar is connected in series with the fast mechanical switch. The current-carrying and heat-dissipating integrated copper busbar is integrally formed with heat dissipation fins. The control module is fixed to the first housing and located inside the structure to issue fault identification and action signals. The power electronic module is located inside the structure and fixed between the control module and the fast mechanical switch. The disconnecting switch is fixed between the power electronic module and the fast mechanical switch to isolate the main circuit voltage based on the signal issued by the control module to clear the fault. The energy-dissipating buffer unit is adjacent to the power electronic module and directly connected to suppress overvoltage and absorb energy.

Description

Technical Field

[0001] This invention relates to the field of circuit breaker technology, and in particular to a hybrid DC circuit breaker structure with low stray inductance and high heat dissipation efficiency. Background Technology

[0002] Traditional mechanical circuit breakers suffer from slow breaking speed, severe contact erosion, short lifespan, and large size, making them unsuitable for the fast and reliable protection requirements of modern power distribution systems. Hybrid DC circuit breakers are a new type of fault protection technology developed based on modern power electronic devices. Because they include power electronic branches, the fully controlled power electronic devices switch from conducting to cut-off states very quickly, giving hybrid circuit breakers a significant advantage in breaking time compared to traditional air circuit breakers. The faster breaking speed of hybrid circuit breakers can limit the rise of fault current and suppress bus voltage drops or interruptions. Hybrid fast switches combine the advantages of mechanical and solid-state switches, offering fast breaking speeds and low conduction losses, making them ideal for high-current, fast-breaking scenarios.

[0003] The information disclosed in the background section is only intended to enhance the understanding of the background of the present invention, and therefore may contain information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0004] To address the shortcomings or defects of the existing technology, a hybrid DC circuit breaker structure with low stray inductance and high heat dissipation efficiency is provided. This structure overcomes the disadvantages of existing mechanical circuit breakers, such as limited operating speed and low breaking capacity. Compared with solid-state circuit breakers, it has the characteristic of low loss, realizing fast and reliable breaking of large-capacity lines and improving the breaking speed and breaking capacity of the circuit breaker device.

[0005] The objective of this invention is achieved through the following technical solutions.

[0006] A hybrid DC circuit breaker structure with low stray inductance and high heat dissipation efficiency includes,

[0007] The first outer shell, together with the second outer shell, forms a hollow structural component. The first outer shell has an inlet and an outlet terminal, while the second outer shell has heat dissipation slots.

[0008] A fast mechanical switch, fixed to the second housing and located within the structural component, is used to carry the normal operating current and to perform a rapid action during the initial current-off phase. The fast mechanical switch, along with the line terminal and the outgoing line terminal, forms the main circuit.

[0009] A fast mechanical switch driver, fixed to the second housing and connected to the fast mechanical switch as an input interface for opening and closing signals, controls a capacitor pre-charged to a predetermined voltage value to provide drive current for the opening and closing action of the fast mechanical switch.

[0010] A current-carrying and heat-dissipating integrated copper busbar is connected in series with the fast mechanical switch. The current-carrying copper busbar and heat dissipation fins are integrally formed. The current-carrying copper busbar is connected to the inlet and outlet terminals respectively, and the heat dissipation fins are thermally conductive and connected to the fast mechanical switch.

[0011] The control module, fixed to the first housing and located within the structural member, is used to issue fault identification and action signals.

[0012] A power electronic module is disposed within the structural component and fixed between the control module and the fast mechanical switch. The power electronic module is connected in parallel with the fast mechanical switch to achieve current transfer during fault shutdown via commutation shutdown. The power electronic module includes at least one power electronic device.

[0013] A disconnecting switch, fixed between the power electronics module and the fast mechanical switch, isolates the main circuit voltage based on signals from the control module to clear faults.

[0014] An energy-absorbing buffer unit is located within the structural component and is directly connected to the power electronic module to suppress overvoltage and absorb energy.

[0015] In the aforementioned hybrid DC circuit breaker structure with low stray inductance and high heat dissipation efficiency, the integrated copper busbar for current carrying and heat dissipation also includes heat dissipation fins at the inlet end, heat dissipation fins at the outlet end, and multiple heat dissipation slots to increase the heat dissipation area.

[0016] In the aforementioned hybrid DC circuit breaker structure with low stray inductance and high heat dissipation efficiency, the heat dissipation slots include a top heat dissipation slot, a side heat dissipation slot, and a bottom heat dissipation slot.

[0017] In the aforementioned low stray inductance and high heat dissipation efficiency hybrid DC circuit breaker structure, the disconnecting switch includes a moving contact, a stationary contact, an electromagnet, and a connecting rod. The moving contact is connected to the connecting rod. When the stationary contact is in contact with the moving contact, current is conducted. When the stationary contact and the moving contact are separated, an insulating gap is formed between the stationary contact and the moving contact to isolate the main circuit voltage. The electromagnet includes an iron core, a capacitor, and a switching coil.

[0018] In the aforementioned hybrid DC circuit breaker structure with low stray inductance and high heat dissipation efficiency, the capacitor serves as the power source for the opening and closing coils. The capacitor is charged with a predetermined voltage and discharges when the disconnecting switch needs to operate. When the opening and closing coils generate current, the connecting rod drives the moving contact to move, thereby connecting or disconnecting the main circuit.

[0019] The hybrid DC circuit breaker structure with low stray inductance and high heat dissipation efficiency also includes a disconnector drive module that connects the control module and the disconnector. The disconnector drive module receives control signals from the control module to drive the disconnector to perform connection or disconnection actions.

[0020] The hybrid DC circuit breaker structure with low stray inductance and high heat dissipation efficiency also includes a measurement module, which includes a voltage measurement module and a current measurement module. The voltage measurement module is connected to the input terminal and the control module respectively and is used to measure the main circuit voltage. The current measurement module is connected to the output terminal and the control module and is used to measure the main circuit current.

[0021] In the aforementioned hybrid DC circuit breaker structure with low stray inductance and high heat dissipation efficiency, the control module includes a main controller and a communication interface. The main controller is used to receive, calculate, and process signals from the voltage measurement module and the current measurement module, identify main circuit faults, and take corresponding protection strategies. The communication interface is used for external communication.

[0022] The hybrid DC circuit breaker structure with low stray inductance and high heat dissipation efficiency further includes a human-machine interface panel fixed on the outside of the first housing. The human-machine interface panel includes user buttons for setting protection characteristics and an electronic display for displaying the status of the main circuit and the device. The user buttons and the electronic display are respectively connected to the control module.

[0023] In the aforementioned low stray inductance and high heat dissipation efficiency hybrid DC circuit breaker structure, the buffer energy dissipation unit includes a buffer branch and an energy dissipation branch, wherein the power electronic module, the buffer branch, and the energy dissipation branch are connected in parallel, the buffer branch includes a capacitor and a resistor, and the energy dissipation branch includes a metal oxide surge arrester.

[0024] Compared with the prior art, the beneficial effects of this invention are as follows:

[0025] This invention overcomes the shortcomings of traditional mechanical circuit breakers, such as limited operating speed and low breaking capacity. Compared with solid circuit breakers, it has the characteristics of low loss, realizes fast and reliable breaking of large-capacity lines, improves the breaking speed and breaking capacity of the circuit breaker device, and has low stray inductance and high heat dissipation efficiency.

[0026] The description provided is merely an overview of the technical solution of this invention. In order to make the technical means of this invention clearer and more understandable, so that those skilled in the art can implement it according to the contents of the specification, and to make the described and other objects, features and advantages of this invention more obvious and understandable, specific embodiments of this invention are described below. Attached Figure Description

[0027] Various other advantages and benefits of the present invention will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. It is obvious that the drawings described below are merely some embodiments of the invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. Furthermore, the same reference numerals denote the same parts throughout the drawings.

[0028] In the attached diagram:

[0029] Figure 1 This is a schematic diagram of the appearance of a hybrid DC circuit breaker with low stray inductance and high heat dissipation efficiency according to the present invention.

[0030] Figure 2 This is a schematic diagram of the composition structure of a hybrid DC circuit breaker with low stray inductance and high heat dissipation efficiency according to the present invention.

[0031] Figure 3 This is a schematic diagram of the low stray inductance design of a hybrid DC circuit breaker with low stray inductance and high heat dissipation efficiency according to the present invention.

[0032] Figure 4 This is a schematic diagram of a high heat dissipation efficiency design for a hybrid DC circuit breaker with low stray inductance and high heat dissipation efficiency according to the present invention.

[0033] Figure 5 This is a schematic diagram of the structure of a hybrid DC circuit breaker isolating switch with low stray inductance and high heat dissipation efficiency according to the present invention.

[0034] The present invention will be further explained below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0035] Specific embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While specific embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the invention and to fully convey the scope of the invention to those skilled in the art.

[0036] It should be noted that certain terms are used in the specification and claims to refer to specific components. Those skilled in the art will understand that different terms may be used to refer to the same component. This specification and claims do not distinguish components based on differences in terminology, but rather on differences in function. The terms "comprising" or "including" used throughout the specification and claims are open-ended and should be interpreted as "comprising but not limited to." The following descriptions are preferred embodiments for carrying out the invention; however, these descriptions are for the purpose of understanding the general principles of the specification and are not intended to limit the scope of the invention. The scope of protection of this invention is determined by the appended claims.

[0037] To facilitate understanding of the embodiments of the present invention, the following will provide further explanation and description with reference to the accompanying drawings and several specific embodiments, and the accompanying drawings do not constitute a limitation on the embodiments of the present invention.

[0038] To better understand, such as Figures 1 to 5 As shown, a hybrid DC circuit breaker structure with low stray inductance and high heat dissipation efficiency includes,

[0039] The first outer shell 201, together with the second outer shell 210, forms a hollow structural component. The first outer shell 201 is provided with an inlet end and an outlet end, and the second outer shell 210 is provided with heat dissipation slots.

[0040] A fast mechanical switch 208 is fixed to the second housing 210 and located within the structural component to carry the normal operating current and to perform a rapid action during the initial current-off phase. The fast mechanical switch, the line terminal, and the outgoing line terminal form the main circuit.

[0041] A fast mechanical switch driver 209, fixed to the second housing 210 and connected to the fast mechanical switch, serves as an input interface for opening and closing signals. A control capacitor is pre-charged to a predetermined voltage value to provide drive current for the opening and closing action of the fast mechanical switch.

[0042] A current-carrying and heat-dissipating integrated copper busbar is connected in series with the fast mechanical switch. The current-carrying copper busbar and heat dissipation fins are integrally formed. The current-carrying copper busbar is connected to the inlet and outlet terminals respectively, and the heat dissipation fins are thermally conductive and connected to the fast mechanical switch.

[0043] The control module 202, which is fixed to the first housing 201 and located within the structural component, is used to identify faults and issue action signals.

[0044] A power electronic module 204 is disposed within the structural component and fixed between the control module 202 and the fast mechanical switch. The power electronic module 204 is connected in parallel with the fast mechanical switch to achieve current transfer by commutation shutdown during fault shutdown. The power electronic module 204 includes at least one power electronic device.

[0045] Disconnect switch 206, which is fixed between power electronics module 204 and the fast mechanical switch, isolates the main circuit voltage based on signals issued by control module 202 to clear faults.

[0046] An energy-absorbing buffer unit 203 is located within the structural component. The energy-absorbing buffer unit 203 is directly connected to the power electronic module 204 in proximity to suppress overvoltage and absorb energy.

[0047] In a preferred embodiment of the hybrid DC circuit breaker structure with low stray inductance and high heat dissipation efficiency, the integrated copper busbar for current carrying and heat dissipation also includes heat dissipation fins at the inlet end, heat dissipation fins at the outlet end, and multiple heat dissipation slots to increase the heat dissipation area.

[0048] In a preferred embodiment of the hybrid DC circuit breaker structure with low stray inductance and high heat dissipation efficiency, the heat dissipation slots include a top heat dissipation slot, a side heat dissipation slot, and a bottom heat dissipation slot.

[0049] In a preferred embodiment of the hybrid DC circuit breaker structure with low stray inductance and high heat dissipation efficiency, the disconnecting switch 206 includes a moving contact, a stationary contact, an electromagnet, and a connecting rod. The moving contact is connected to the connecting rod. When the stationary contact is in contact with the moving contact, current is conducted. When the stationary contact is separated from the moving contact, an insulating gap is formed between the stationary contact and the moving contact to isolate the main circuit voltage. The electromagnet includes an iron core, a capacitor, and a switching coil.

[0050] In a preferred embodiment of the hybrid DC circuit breaker structure with low stray inductance and high heat dissipation efficiency, the capacitor serves as the power source for the opening and closing coils. The capacitor is charged with a predetermined voltage and discharges when the disconnecting switch 206 needs to operate. When the opening and closing coils generate current, the connecting rod drives the moving contact to move, thereby connecting or disconnecting the main circuit.

[0051] In a preferred embodiment of the hybrid DC circuit breaker structure with low stray inductance and high heat dissipation efficiency, it further includes a disconnector drive module 507 that connects the control module 202 and the disconnector switch 206. The disconnector drive module 507 receives control signals from the control module 202 to drive the disconnector switch 206 to perform connection or disconnection actions.

[0052] In a preferred embodiment of the hybrid DC circuit breaker structure with low stray inductance and high heat dissipation efficiency, a measurement module is further included. The measurement module includes a voltage measurement module and a current measurement module. The voltage measurement module is connected to the input terminal and the control module 202 respectively and is used to measure the main circuit voltage. The current measurement module is connected to the output terminal and the control module 202 and is used to measure the main circuit current.

[0053] In a preferred embodiment of the hybrid DC circuit breaker structure with low stray inductance and high heat dissipation efficiency, the control module 202 includes a main controller and a communication interface. The main controller is used to receive, calculate and process signals from the voltage measurement module and the current measurement module, identify main circuit faults and take corresponding protection strategies. The communication interface is used for external communication.

[0054] In a preferred embodiment of the hybrid DC circuit breaker structure with low stray inductance and high heat dissipation efficiency, a human-machine interface panel is further fixed to the outside of the first housing 201. The human-machine interface panel includes user buttons for setting protection characteristics and an electronic display for displaying the status of the main circuit and the device. The user buttons and the electronic display are respectively connected to the control module 202.

[0055] In a preferred embodiment of the hybrid DC circuit breaker structure with low stray inductance and high heat dissipation efficiency, the buffer energy dissipation unit 203 includes a buffer branch and an energy dissipation branch, wherein the power electronic module 204, the buffer branch and the energy dissipation branch are connected in parallel, the buffer branch includes a capacitor and a resistor, and the energy dissipation branch includes a metal oxide surge arrester.

[0056] In one embodiment, the hybrid DC circuit breaker structure with low stray inductance and high heat dissipation efficiency includes a human-machine interface panel, a first housing 201, a second housing 210, an inlet terminal 101, and an outlet terminal 106. The human-machine interface panel 103 is fixed on the first housing 201. The first housing 201 is provided with a wiring groove and a display opening. The second housing 210 is provided with a heat dissipation groove, which serves as a heat outlet to facilitate air convection.

[0057] In one embodiment, the input terminal 101 is configured as the input interface of the main circuit, the fast mechanical switch and power electronic module 204 receive the first control signal sent by the control module 202 to turn on or off the main circuit, the isolating switch 206 is used to receive the second control signal sent by the control module 202 and isolate the main circuit voltage, and the output terminal is configured as the output interface of the main circuit.

[0058] In one embodiment, the hybrid DC circuit breaker structure with low stray inductance and high heat dissipation efficiency includes,

[0059] Inlet terminal 101 is configured as the inlet interface between the device and the main circuit for connection.

[0060] Outgoing terminal 106 is configured as the outgoing interface between the device and the main circuit for connection.

[0061] Human-computer interaction panel 103 is used to display the device's model and performance parameters.

[0062] Electronic display 104 is used to display the device's temperature, voltage, and current signals.

[0063] User button 105 is used for opening and closing operations and configuring setting values, etc.

[0064] The first outer shell 201 serves as a structural component, providing functions such as fixation and flame retardancy.

[0065] The second outer casing 210 serves as a structural component and also has heat dissipation slots 107 to reduce the internal temperature of the device.

[0066] like Figure 2 As shown, the control module 202 and the buffer energy dissipation unit 203 are used to suppress overvoltage and absorb energy.

[0067] The 204 power electronics module features a low-inductance design for safe and fast current transfer.

[0068] Disconnecting switch 206 is used to perform fault clearing and voltage isolation.

[0069] The 208 fast-acting mechanical switch carries the normal operating current, features a low heat loss design, and achieves rapid action during the initial current-off phase.

[0070] The fast mechanical switch driver 209 serves as the input interface for opening and closing signals. It controls the capacitor to be pre-charged to a specific voltage value, providing the drive current for the fast mechanical switch's opening and closing actions. Figure 3 As shown, the fast mechanical switch 208 is connected in parallel with the power electronic module 204 and the buffer energy dissipation unit 203.

[0071] The buffer energy dissipation unit 203 consists of a capacitor, a resistor, and a metal oxide surge arrester.

[0072] The terminal blocks 301 and 305 of the power electronic module 204 and the buffer energy dissipation terminal blocks 302 and 304 of the energy dissipation unit 203 have a compact structure, short commutation path, and low stray inductance, ensuring the reliability and speed of the commutation process.

[0073] like Figure 4As shown, in the integrated copper busbar for heat dissipation, the heat dissipation fins 401 at the inlet end and 406 at the outlet end increase the heat dissipation area and reduce the temperature rise of the device. The top heat dissipation slot 402, the side heat dissipation slots 403 and 404, and the bottom heat dissipation slot 405 enhance air convection and reduce the temperature rise of the device while ensuring mechanical strength.

[0074] like Figure 5 As shown, in the disconnector switch 206, the stationary contacts 501 and 502, as part of the connection path between the disconnector switch and the main circuit, conduct current when in contact with the moving contacts 503 and 504. When separated from the moving contacts 503 and 504, an insulating gap is formed between the stationary contacts 501 and 502 and the moving contacts 503 and 504, isolating the main circuit voltage.

[0075] Moving contacts 503 and 504 are connected to connecting rod 505. When moving contact 503 contacts stationary contact 501, current is conducted. When moving contact 504 separates from stationary contact 502, an insulating gap is formed between stationary contact 502 and moving contact 504, isolating the main circuit voltage.

[0076] Link 505 connects moving contacts 503 and 504. When the opening and closing coils generate current, they drive moving contacts 503 and 504 to move, thereby connecting or disconnecting the main circuit.

[0077] Capacitor 506 serves as the power source for the opening and closing coils. It is charged with a certain voltage and discharged when the disconnecting switch needs to operate.

[0078] The disconnector switch drive module 507 is used to receive control signals from the control module and drive the disconnector switch 206 to perform connection or disconnection actions.

[0079] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0080] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A hybrid DC circuit breaker structure with low stray inductance and high heat dissipation efficiency, characterized in that, It includes, The first outer shell, together with the second outer shell, forms a hollow structural component. The first outer shell has an inlet and an outlet terminal, while the second outer shell has heat dissipation slots. A fast mechanical switch, fixed to the second housing and located within the structural component, is used to carry the normal operating current and to perform a rapid action during the initial current-off phase. The fast mechanical switch, along with the line terminal and the outgoing line terminal, forms the main circuit. A fast mechanical switch driver, fixed to the second housing and connected to the fast mechanical switch as an input interface for opening and closing signals, controls a capacitor pre-charged to a predetermined voltage value to provide drive current for the opening and closing action of the fast mechanical switch. A current-carrying and heat-dissipating integrated copper busbar is connected in series with the fast mechanical switch. The current-carrying copper busbar and heat dissipation fins are integrally formed. The current-carrying copper busbar is connected to the inlet and outlet terminals respectively, and the heat dissipation fins are thermally conductive and connected to the fast mechanical switch. The control module, fixed to the first housing and located within the structural member, is used to issue fault identification and action signals. A power electronic module is disposed within the structural component and fixed between the control module and the fast mechanical switch. The power electronic module is connected in parallel with the fast mechanical switch to achieve current transfer during fault shutdown via commutation shutdown. The power electronic module includes at least one power electronic device. A disconnecting switch, fixed between the power electronics module and the fast mechanical switch, isolates the main circuit voltage based on signals from the control module to clear faults. An energy-absorbing buffer unit is located within the structural component and is directly connected to the power electronic module to suppress overvoltage and absorb energy.

2. The hybrid DC circuit breaker structure with low stray inductance and high heat dissipation efficiency as described in claim 1, characterized in that, The integrated copper busbar for heat dissipation also includes heat dissipation fins at the inlet end and outlet end to increase the heat dissipation area, as well as multiple heat dissipation slots.

3. The hybrid DC circuit breaker structure with low stray inductance and high heat dissipation efficiency as described in claim 2, characterized in that, The heat dissipation slots include top heat dissipation slots, side heat dissipation slots, and bottom heat dissipation slots.

4. The hybrid DC circuit breaker structure with low stray inductance and high heat dissipation efficiency as described in claim 1, characterized in that, The disconnecting switch includes a moving contact, a stationary contact, an electromagnet, and a connecting rod. The moving contact is connected to the connecting rod. When the stationary contact is in contact with the moving contact, current is conducted. When the stationary contact and the moving contact are separated, an insulating gap is formed between the stationary contact and the moving contact to isolate the main circuit voltage. The electromagnet includes an iron core, a capacitor, and a switching coil.

5. The hybrid DC circuit breaker structure with low stray inductance and high heat dissipation efficiency as described in claim 1, characterized in that, The capacitor powers the opening and closing coils. The capacitor is charged with a predetermined voltage and discharges when the disconnecting switch needs to operate. When the opening and closing coils generate current, the connecting rod drives the moving contact to move, thereby connecting or disconnecting the main circuit.

6. The hybrid DC circuit breaker structure with low stray inductance and high heat dissipation efficiency as described in claim 1, characterized in that, It also includes a disconnector drive module that connects the control module and the disconnector. The disconnector drive module receives control signals from the control module to drive the disconnector to perform connection or disconnection actions.

7. The hybrid DC circuit breaker structure with low stray inductance and high heat dissipation efficiency as described in claim 1, characterized in that, It also includes a measurement module, which includes a voltage measurement module and a current measurement module. The voltage measurement module is connected to the input terminal and the control module respectively and is used to measure the main circuit voltage. The current measurement module is connected to the output terminal and the control module and is used to measure the main circuit current.

8. The hybrid DC circuit breaker structure with low stray inductance and high heat dissipation efficiency as described in claim 7, characterized in that, The control module includes a main controller and a communication interface. The main controller is used to receive, calculate and process signals from the voltage measurement module and the current measurement module, identify main circuit faults and take corresponding protection strategies. The communication interface is used for external communication.

9. The hybrid DC circuit breaker structure with low stray inductance and high heat dissipation efficiency as described in claim 1, characterized in that, It also includes a human-machine interface panel fixed to the outside of the first housing. The human-machine interface panel includes user buttons for setting protection characteristics and an electronic display for displaying the main circuit and device status. The user buttons and the electronic display are respectively connected to the control module.

10. The hybrid DC circuit breaker structure with low stray inductance and high heat dissipation efficiency as described in claim 1, characterized in that, The buffer energy dissipation unit includes a buffer branch and an energy dissipation branch, wherein the power electronic module, the buffer branch and the energy dissipation branch are connected in parallel, the buffer branch includes a capacitor and a resistor, and the energy dissipation branch includes a metal oxide surge arrester.

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