A state detection circuit, method and circuit breaker for a solid-state switch

Abstract

The present application provides a state detection circuit, a method, and a circuit breaker for a solid-state switch. The state detection circuit includes a first detection module, a second detection module, and a processing module. Among them, the first detection module controls the connection or disconnection between the first detection module and the driving end of the solid-state switch, and sends a first state detection signal to the processing module according to the connection or disconnection between the first detection module and the driving end of the solid-state switch; the second detection module can send a second state detection signal to the processing module according to the conduction or disconnection of the solid-state switch; the processing module can determine the state of the solid-state switch according to the first state detection signal and the second state detection signal. Implementing the present application can still detect the state of the solid-state switch when the voltage at both ends of the input end and the output end of the solid-state switch remains unchanged, and has strong applicability.

Description

Technical Field

[0001] This application relates to the field of power technologies, and in particular to a state detection circuit and method for a solid-state switch, and a circuit breaker. Background Art

[0002] Solid-state switches are widely used in power systems. They mainly use semiconductor devices such as Metal-Oxide-Semiconductor Field-Effect Transistors (MOSFETs), Insulated Gate Bipolar Transistors (IGBTs), or Silicon Controlled Rectifiers (SCRs) to implement the closing and turning-off functions, thereby controlling the connection or disconnection of the power supply / transmission loop in the power system. In other words, the state of the solid-state switch is closely related to the operation of the power system. Therefore, in order to ensure the reliable operation of the power system, it is necessary to detect the state of the solid-state switch.

[0003] The prior art uses Figure 1 the circuit shown in 11 ( Figure 1 taking the solid-state switch Q in 11 specifically implemented as an IGBT as an example) to detect the state. The specific implementation principle is to judge the state of the IGBT by detecting the control signal of the IGBT and the voltage across the emitter and collector of the IGBT. However, the IGBT state feedback isolation signal IGBT_STATUS in the prior art can only be implemented based on the change in the voltage across the emitter and collector of the IGBT when the IGBT is in different states. If the voltage across the emitter and collector of the IGBT remains unchanged, the prior art cannot detect the state of the IGBT, and the applicability is not strong enough. Summary of the Invention

[0004] This application provides a state detection circuit, method, and circuit breaker for a solid-state switch, which can still detect the state of the solid-state switch when the voltage across the input and output terminals of the solid-state switch remains unchanged, and has strong applicability.

[0005] In a first aspect, an embodiment of this application provides a state detection circuit for a solid-state switch. The state detection circuit includes a first detection module, a second detection module, and a processing module. Among them, the first end of the first detection module is coupled to the driving end of the solid-state switch, and the second end of the first detection module is coupled to the first end of the processing module; the first end of the second detection module is coupled to the input end of the solid-state switch, the second end of the second detection module is coupled to the output end of the solid-state switch, and the third end of the second detection module is coupled to the second end of the processing module.

[0006] In a specific implementation, the first detection module can control the connection or disconnection between the first detection module and the driving end of the solid-state switch, and send a first status detection signal to the processing module according to the connection or disconnection between the first detection module and the driving end of the solid-state switch; the second detection module can send a second status detection signal to the processing module according to the conduction or disconnection of the solid-state switch; the processing module can determine the status of the solid-state switch according to the first status detection signal and the second status detection signal.

[0007] The specific implementation principle of the embodiment of the present application is as follows: The first detection module controls and detects the connection or disconnection between the first detection module and the driving end of the solid-state switch, the second detection module detects the conduction or disconnection of the solid-state switch, and the processing module determines the status of the solid-state switch according to the detection result of the first detection module (i.e., the first status detection signal) and the detection result of the second detection module (i.e., the second status detection signal). Different from the prior art in which the status of the IGBT can be determined only when the voltage between the emitter and collector of the IGBT changes, the embodiment of the present application is based on the connection or disconnection between the first detection module and the driving end of the solid-state switch (i.e., whether a closed loop is formed in the first detection module), and whether a closed loop can be formed between the input end and the output end of the solid-state switch to determine the status of the solid-state switch. Since the closed loop is not affected by the voltage change between the input end and the output end of the solid-state switch, even if the voltage between the input end and the output end of the solid-state switch remains unchanged, the embodiment of the present application can still detect the status of the solid-state switch, and has strong applicability.

[0008] Combined with the first aspect, in a first possible implementation manner, the above-mentioned processing module determines the status of the solid-state switch according to the first status detection signal and the second status detection signal, and the specific implementation is as follows: When the first status detection signal indicates that the connection between the first detection module and the driving end of the solid-state switch is disconnected, and the second status detection signal indicates that the solid-state switch is conducting, the processing module determines that the solid-state switch is in a failed short-circuit state.

[0009] Combined with the first aspect, in a second possible implementation manner, the above-mentioned processing module determines the status of the solid-state switch according to the first status detection signal and the second status detection signal, and the specific implementation is as follows: When the first status detection signal indicates that the connection between the first detection module and the driving end of the solid-state switch is connected, and the second status detection signal indicates that the solid-state switch is disconnected, the processing module determines that the status of the solid-state switch is a failed open-circuit state.

[0010] Combined with the first aspect or any of the above possible implementation manners of the first aspect, in the third possible implementation manner, the first detection module includes a first DC power supply, a first switch, and a first signal acquisition unit. One end of the first DC power supply is coupled to one end of the first switch, the other end of the first switch is coupled to the driving end of the solid-state switch and the first end of the first signal acquisition unit, the second end of the first signal acquisition unit is coupled to the other end of the first DC power supply, and the third end of the first signal acquisition unit is coupled to the processing module.

[0011] The first detection module controls the connection or disconnection between the first detection module and the driving end of the solid-state switch, and sends a first status detection signal to the processing module according to the connection or disconnection between the first detection module and the driving end of the solid-state switch. The specific implementation is as follows:

[0012] When the first switch controls the connection between the first DC power supply and the driving end of the solid-state switch, the first DC power supply, the first switch, the driving end of the solid-state switch, and the first signal acquisition unit form a first closed loop, triggering the first signal acquisition unit to send a first status detection signal to the processing module, indicating the connection between the first detection module and the driving end of the solid-state switch.

[0013] Combined with the third possible implementation manner of the first aspect, in the fourth possible implementation manner, the first detection module further includes a first resistor and a second resistor.

[0014] Wherein, the other end of the first switch is coupled to the driving end of the solid-state switch and the first end of the first signal acquisition unit, and the second end of the first signal acquisition unit is coupled to the other end of the first DC power supply. The specific implementation is as follows:

[0015] The other end of the first switch is coupled to one end of the first resistor, the other end of the first resistor is coupled to the driving end of the solid-state switch and the first end of the first signal acquisition unit, the second end of the first signal acquisition unit is coupled to one end of the second resistor, and the other end of the second resistor is coupled to the other end of the first DC power supply. At this time, the first resistor and the second resistor can limit the current in the first closed loop formed in the first detection module when the first switch is turned on, and the voltage at the driving end of the solid-state switch is the voltage divided by the second resistor. Implementing the embodiments of the present application further improves the safety and reliability of the status detection circuit provided in the embodiments of the present application.

[0016] In combination with the first aspect or in combination with any one of the above possible implementations of the first aspect, in a fifth possible implementation, the above-mentioned second detection module includes a second DC power supply and a second signal acquisition unit; wherein, one end of the second DC power supply is coupled to the input end of the solid-state switch, the output end of the solid-state switch is coupled to the first end of the second signal acquisition unit, the second end of the second signal acquisition unit is coupled to the other end of the second DC power supply, and the third end of the second signal acquisition unit is coupled to the processing module.

[0017] The second detection module sends a second state detection signal to the processing module according to whether the solid-state switch is turned on or off, which is specifically implemented as follows:

[0018] When the solid-state switch is turned on, the second DC power supply, the input end of the solid-state switch, the output end of the solid-state switch and the second signal acquisition unit form a second closed loop, triggering the second signal acquisition unit to send a second state detection signal representing the conduction of the solid-state switch to the processing module.

[0019] In combination with the fifth possible implementation of the first aspect, in a sixth possible implementation, the second detection module further includes a first diode. One end of the second DC power supply is coupled to the input end of the solid-state switch, which is specifically implemented as follows: one end of the second DC power supply is coupled to the anode of the first diode, and the cathode of the first diode is coupled to the input end of the solid-state switch. In the embodiment of the present application, the first diode can prevent the current backflow of the solid-state switch and protect the second DC power supply.

[0020] In combination with the sixth possible implementation of the first aspect, in the seventh possible implementation, the second detection module further includes a third resistor and a fourth resistor. The cathode of the first diode is coupled to the input end of the solid-state switch, which is specifically implemented as follows: the cathode of the first diode is coupled to one end of the third resistor, and the other end of the third resistor is coupled to the input end of the solid-state switch; the second end of the second signal acquisition unit is coupled to the other end of the second DC power supply, which is specifically implemented as follows: the second end of the second signal acquisition unit is coupled to one end of the fourth resistor, and the other end of the fourth resistor is coupled to the other end of the second DC power supply. In the embodiment of the present application, the third resistor and the fourth resistor can limit the current of the second closed loop formed in the second detection module, thereby improving the safety and reliability of the state detection circuit provided in the embodiment of the present application.

[0021] Combined with the first aspect or any of the above possible implementation manners of the first aspect, in the eighth possible implementation manner, the above-mentioned solid-state switch is built into the circuit breaker, and the circuit breaker further includes a second diode, a third diode, a fourth diode, and a fifth diode; wherein, the input end of the solid-state switch is coupled to the cathodes of the second diode and the third diode, and the output end of the solid-state switch is coupled to the anodes of the fourth diode and the fifth diode; the anode of the second diode and the cathode of the fourth diode are coupled to the first end of the circuit breaker, and the anode of the third diode and the cathode of the fifth diode are coupled to the second end of the circuit breaker. In a specific implementation, when the first end of the circuit breaker is the input end of the circuit breaker, the second end of the circuit breaker is the output end of the circuit breaker. At this time, when the input end of the circuit breaker is coupled to the third DC power supply and the output end of the circuit breaker is coupled to the load, the current of the third DC power supply can flow into the input end of the solid-state switch through the second diode. When the solid-state switch is in the on state, it reaches the output end of the solid-state switch, and then is provided to the load through the fifth diode. Or, when the second end of the circuit breaker is the input end of the circuit breaker, the first end of the circuit breaker is the output end of the circuit breaker. At this time, when the input end of the circuit breaker is coupled to the third DC power supply and the output end of the circuit breaker is coupled to the load, the current of the third DC power supply can flow into the input end of the solid-state switch through the third diode. When the solid-state switch is in the on state, it reaches the output end of the solid-state switch, and then is provided to the load through the fourth diode. Generally speaking, the second diode, the third diode, the fourth diode, and the fifth diode enable the circuit breaker to be applicable to the scenario of bidirectional current flow, that is, the first end of the circuit breaker can be coupled to both the third DC power supply and the load.

[0022] Combined with the first aspect or any of the above possible implementation manners of the first aspect, in the ninth possible implementation manner, the above-mentioned solid-state switch is built into the circuit breaker; wherein, the circuit breaker further includes a disconnect switch, and the disconnect switch is connected in series with the solid-state switch. The above-mentioned processing module can also control the disconnect switch to conduct or turn off according to the operation instruction for the circuit breaker and the state of the solid-state switch.

[0023] Combined with the ninth possible implementation manner of the first aspect, in the tenth possible implementation manner, the state of the above-mentioned solid-state switch includes a failure short-circuit state.

[0024] The above processing module controls the disconnector to conduct or cut off according to the operation instruction for the circuit breaker and the state of the solid-state switch. The specific implementation is as follows: When the processing module receives a closing instruction for the circuit breaker and the state of the solid-state switch is not the failed short-circuit state, it controls the disconnector to conduct; after controlling the disconnector to conduct, the processing module can also control the solid-state switch to conduct. In the embodiment of the present application, it is determined whether to control the disconnector to conduct according to the closing instruction for the circuit breaker and whether the state of the solid-state switch is the failed short-circuit state. Thus, it can be ensured that before controlling the disconnector to conduct, the state of the solid-state switch is not the failed short-circuit state, that is, during the conduction process of the disconnector, there is no voltage across the disconnector, and the generation of electric arcs can be avoided. Implementing the embodiment of the present application can utilize the state detection result of the solid-state switch to control the closing of the circuit breaker, ensuring the safety of the circuit breaker closing and avoiding accidents.

[0025] Combined with the ninth possible implementation manner of the first aspect, in the eleventh possible implementation manner, the state of the above solid-state switch includes the failed short-circuit state.

[0026] The above processing module controls the disconnector to conduct or cut off according to the operation instruction for the circuit breaker and the state of the solid-state switch. The specific implementation is as follows: When the processing module receives a closing instruction for the circuit breaker and the state of the solid-state switch is the failed short-circuit state, it does not control the disconnector to conduct.

[0027] Combined with the ninth possible implementation manner to the eleventh possible implementation manner of the first aspect, in the twelfth possible implementation manner, the state of the above solid-state switch includes the failed short-circuit state.

[0028] The above processing module controls the disconnector to conduct or cut off according to the operation instruction for the circuit breaker and the state of the solid-state switch. The specific implementation is as follows: The processing module can control the disconnector to cut off according to the opening instruction for the circuit breaker and after detecting that the state of the solid-state switch is not the failed short-circuit state after controlling the solid-state switch to cut off. In the embodiment of the present application, it is determined whether to control the disconnector to cut off according to the opening instruction for the circuit breaker and whether the state of the solid-state switch is the failed short-circuit state. Thus, it can be ensured that before controlling the disconnector to cut off, the state of the solid-state switch is not the failed short-circuit state, that is, during the cut-off process of the disconnector, there is no voltage across the disconnector, and the generation of electric arcs can be avoided. Implementing the embodiment of the present application can utilize the state detection result of the solid-state switch to control the opening of the circuit breaker, ensuring the safety of the circuit breaker opening and avoiding accidents.

[0029] Combined with the ninth possible implementation manner to the eleventh possible implementation manner of the first aspect, in the thirteenth possible implementation manner, the state of the above solid-state switch includes the failed short-circuit state;

[0030] The above-mentioned processing module controls the isolation switch to conduct or turn off according to the operation instruction for the circuit breaker and the state of the solid-state switch. The specific implementation is as follows: when the processing module receives a circuit breaker opening instruction and, after controlling the solid-state switch to turn off, detects that the state of the solid-state switch is a failed short-circuit state, it does not control the isolation switch to turn off.

[0031] Combined with the first aspect or any of the above possible implementation manners of the first aspect, in the fourteenth possible implementation manner, the above-mentioned circuit breaker further includes a mechanical switch and a second diode; one end of the mechanical switch is coupled to the anode of the second diode, the cathode of the second diode is coupled to the input end of the solid-state switch, and the output end of the solid-state switch is coupled to the other end of the mechanical switch. Among them, the processing module can also control the mechanical switch to conduct or turn off according to the operation instruction for the circuit breaker and the state of the solid-state switch.

[0032] Combined with the fourteenth possible implementation manner of the first aspect, in the fifteenth possible implementation manner, the above-mentioned circuit breaker further includes an isolation switch. One end of the mechanical switch is coupled to the anode of the second diode, and the specific implementation can be: one end of the isolation switch is coupled to one end of the mechanical switch and the anode of the second diode; or, one end of the isolation switch is coupled to the anode of the second diode, and the other end of the isolation switch is coupled to one end of the mechanical switch.

[0033] Combined with the fourteenth possible implementation manner of the first aspect or the fifteenth possible implementation manner of the first aspect, in the sixteenth possible implementation manner, the state of the above-mentioned solid-state switch includes a failed open-circuit state.

[0034] The above-mentioned processing module controls the mechanical switch to conduct or turn off according to the operation instruction for the circuit breaker and the state of the solid-state switch. The specific implementation is as follows: when the processing module receives a circuit breaker closing instruction and, after controlling the solid-state switch to conduct, detects that the state of the solid-state switch is not a failed open-circuit state, it controls the mechanical switch to conduct. In the embodiments of the present application, by determining whether to control the mechanical switch to conduct according to the circuit breaker closing instruction and whether the state of the solid-state switch is a failed open-circuit state, it can be ensured that before the mechanical switch conducts, the state of the solid-state switch is not a failed open-circuit state, that is, during the conduction process of the mechanical switch, there is no voltage across the mechanical switch, and the generation of electric arcs can be avoided.

[0035] Combined with the fourteenth possible implementation manner of the first aspect or the fifteenth possible implementation manner of the first aspect, in the seventeenth possible implementation manner, the state of the above-mentioned solid-state switch includes a failed open-circuit state.

[0036] The above processing module controls the mechanical switch to conduct or turn off according to the operation instruction for the circuit breaker and the state of the solid-state switch. The specific implementation is as follows: according to the closing instruction for the circuit breaker and detecting that the state of the solid-state switch is a failed open state after controlling the solid-state switch to conduct, the processing module does not control the mechanical switch to conduct.

[0037] Combined with the fourteenth possible implementation manner of the first aspect or combined with the seventeenth possible implementation manner of the first aspect, in the eighteenth possible implementation manner, the state of the above solid-state switch includes a failed open state.

[0038] The above processing module controls the mechanical switch to conduct or turn off according to the operation instruction for the circuit breaker and the state of the solid-state switch. The specific implementation is as follows: according to the opening instruction for the circuit breaker and the state of the solid-state switch not being a failed open state, the processing module controls the mechanical switch to turn off; and after controlling the mechanical switch to turn off, it controls the solid-state switch to turn off. In the embodiment of the present application, by determining whether to control the mechanical switch to turn off according to the opening instruction for the circuit breaker and whether the state of the solid-state switch is a failed short state, it can be ensured that before controlling the mechanical switch, the state of the solid-state switch is not a failed open state, that is, during the process of turning off the mechanical switch, there is no voltage across the mechanical switch, and the generation of electric arcs can be avoided. Implementing the embodiment of the present application can utilize the state detection result of the solid-state switch to control the circuit breaker to open, ensuring the safety of the circuit breaker opening and avoiding accidents.

[0039] Combined with the fourteenth possible implementation manner of the first aspect or combined with the seventeenth possible implementation manner of the first aspect, in the nineteenth possible implementation manner, the state of the above solid-state switch includes a failed open state.

[0040] The above processing module controls the mechanical switch to conduct or turn off according to the operation instruction for the circuit breaker and the state of the solid-state switch. The specific implementation is as follows: according to the opening instruction for the circuit breaker and the state of the solid-state switch being a failed open state, the processing module does not control the mechanical switch to turn off.

[0041] In a second aspect, an embodiment of the present application provides a method for detecting the state of a solid-state switch. Among them, the driving end of the solid-state switch is coupled to the first end of the first detection module, and the second end of the first detection module is coupled to the first end of the processing module; the input end of the solid-state switch is coupled to the first end of the second detection module, and the second end of the second detection module is coupled to the output end of the solid-state switch; the third end of the second detection module is coupled to the second end of the processing module. The above state detection method includes:

[0042] Controlling the connection or disconnection between the first detection module and the driving end of the solid-state switch, and generating a first state detection signal according to the connection or disconnection between the first detection module and the driving end of the solid-state switch;

[0043] Generate a second state detection signal according to the connection or disconnection between the input end and the output end of the solid-state switch;

[0044] Determine the state of the solid-state switch according to the first state detection signal and the second state detection signal.

[0045] Combined with the second aspect, in a first possible implementation manner, the above-mentioned determining the state of the solid-state switch according to the first state detection signal and the second state detection signal is specifically implemented as: when the first state detection signal indicates disconnection between the first detection module and the driving end of the solid-state switch, and the second state detection signal indicates that the solid-state switch is conducting, it is determined that the solid-state switch is in a failed short-circuit state.

[0046] Or, when the first state detection signal indicates connection between the first detection module and the driving end of the solid-state switch, and the second state detection signal indicates that the solid-state switch is disconnected, it is determined that the state of the solid-state switch is a failed open-circuit state.

[0047] Combined with the second aspect or the first possible implementation manner of the second aspect, in a second possible implementation manner, the above-mentioned solid-state switch is built in the circuit breaker; wherein, the circuit breaker further includes a disconnecting switch, and the disconnecting switch is connected in series with the solid-state switch. The above state detection method further includes: controlling the disconnecting switch to conduct or disconnect according to the operation instruction for the circuit breaker and the state of the solid-state switch.

[0048] Combined with the second possible implementation manner of the second aspect, in a third possible implementation manner, the state of the above-mentioned solid-state switch includes a failed short-circuit state.

[0049] The above-mentioned controlling the disconnecting switch to conduct or disconnect according to the operation instruction for the circuit breaker and the state of the solid-state switch is specifically implemented as: according to the closing instruction for the circuit breaker and the state of the solid-state switch not being a failed short-circuit state, controlling the disconnecting switch to conduct; and after controlling the disconnecting switch to conduct, controlling the solid-state switch to conduct.

[0050] Combined with the second possible implementation manner of the second aspect, in a fourth possible implementation manner, the state of the above-mentioned solid-state switch includes a failed short-circuit state.

[0051] The above-mentioned controlling the disconnecting switch to conduct or disconnect according to the operation instruction for the circuit breaker and the state of the solid-state switch is specifically implemented as: according to the closing instruction for the circuit breaker and the state of the solid-state switch being a failed short-circuit state, not controlling the disconnecting switch to conduct.

[0052] Combined with the second possible implementation manner to the fourth possible implementation manner of the second aspect, in a fifth possible implementation manner, the state of the above-mentioned solid-state switch includes a failed short-circuit state.

[0053] Based on the operation instruction for the circuit breaker and the state of the solid-state switch, controlling the isolation switch to conduct or cut off, which is specifically implemented as follows: According to the opening instruction for the circuit breaker and the state of the solid-state switch not being the failed short-circuit state detected after controlling the solid-state switch to cut off, controlling the isolation switch to cut off.

[0054] In the second aspect, from the second possible implementation manner to the fourth possible implementation manner, in the sixth possible implementation manner, the state of the above-mentioned solid-state switch includes the failed short-circuit state.

[0055] Based on the operation instruction for the circuit breaker and the state of the solid-state switch, controlling the isolation switch to conduct or cut off specifically includes:

[0056] According to the opening instruction for the circuit breaker and the state of the solid-state switch being the failed short-circuit state detected after controlling the solid-state switch to cut off, not controlling the isolation switch to cut off.

[0057] In the second aspect or any of the above possible implementation manners of the second aspect, in the seventh possible implementation manner, the above-mentioned solid-state switch is built into the circuit breaker; wherein, the circuit breaker further includes a mechanical switch and a second diode; one end of the mechanical switch is coupled to the anode of the second diode, the cathode of the second diode is coupled to the input end of the solid-state switch, and the output end of the solid-state switch is coupled to the other end of the mechanical switch. The above state detection method further includes:

[0058] Based on the operation instruction for the circuit breaker and the state of the solid-state switch, controlling the mechanical switch to conduct or cut off.

[0059] In the eighth possible implementation manner in combination with the seventh possible implementation manner of the second aspect, the state of the above-mentioned solid-state switch includes the failed open-circuit state.

[0060] Based on the operation instruction for the circuit breaker and the state of the solid-state switch, controlling the mechanical switch to conduct or cut off specifically includes:

[0061] According to the closing instruction for the circuit breaker and the state of the solid-state switch not being the failed open-circuit state detected after controlling the solid-state switch to conduct, controlling the mechanical switch to conduct.

[0062] In the ninth possible implementation manner in combination with the seventh possible implementation manner to the eighth possible implementation manner of the second aspect, the state of the above-mentioned solid-state switch includes the failed open-circuit state.

[0063] Based on the operation instruction for the circuit breaker and the state of the solid-state switch, controlling the mechanical switch to conduct or cut off specifically includes:

[0064] According to the closing instruction for the circuit breaker, and after detecting that the state of the solid-state switch is a failed open state after controlling the solid-state switch to conduct, the mechanical switch is not controlled to conduct.

[0065] Combined with the seventh possible implementation manner of the second aspect to the ninth possible implementation manner of the second aspect, in the tenth possible implementation manner, the state of the above-mentioned solid-state switch includes a failed open state.

[0066] The above-mentioned control of the mechanical switch to conduct or turn off according to the operation instruction for the circuit breaker and the state of the solid-state switch is specifically implemented as follows: According to the opening instruction for the circuit breaker and the state of the solid-state switch not being a failed open state, the mechanical switch is controlled to turn off; and after controlling the mechanical switch to turn off, the solid-state switch is controlled to turn off.

[0067] Combined with the seventh possible implementation manner of the second aspect to the ninth possible implementation manner of the second aspect, in the eleventh possible implementation manner, the state of the above-mentioned solid-state switch includes a failed open state.

[0068] The above-mentioned control of the mechanical switch to conduct or turn off according to the operation instruction for the circuit breaker and the state of the solid-state switch is specifically implemented as follows: According to the opening instruction for the circuit breaker and the state of the solid-state switch being a failed open state, the mechanical switch is not controlled to turn off.

[0069] In a third aspect, an embodiment of the present application provides a circuit breaker, which includes a solid-state switch and the state detection circuit described in combination with the first aspect or any one of the possible implementation manners of the first aspect; wherein, the state detection circuit can determine the state of the solid-state switch.

[0070] It should be understood that the implementations and beneficial effects of the above-mentioned multiple aspects of the present application can be referred to each other. Description of the Drawings

[0071] Figure 1 A state detection circuit for a solid-state switch in the prior art;

[0072] Figure 2 A structural block diagram of the state detection circuit for the solid-state switch provided by the embodiment of the present application;

[0073] Figure 3 A circuit diagram of the first detection module provided by the embodiment of the present application;

[0074] Figure 4 A circuit diagram of the second detection module provided by the embodiment of the present application;

[0075] Figure 5 A circuit diagram of the state detection circuit for the solid-state switch provided by the embodiment of the present application;

[0076] Figures 6A - 6B Part of the circuit diagram of the circuit breaker provided by the embodiment of the present application;

[0077] Figure 7 A schematic flow chart of a method for detecting the state of a solid-state switch provided by the embodiment of the present application;

[0078] Figure 8 Another schematic flow chart of a method for detecting the state of a solid-state switch provided by the embodiment of the present application;

[0079] Figures 9A - 9B Another part of the circuit diagram of the circuit breaker provided by the embodiment of the present application;

[0080] Figure 10 Another schematic flow chart of a method for detecting the state of a solid-state switch provided by the embodiment of the present application;

[0081] Figure 11 Another schematic flow chart of a method for detecting the state of a solid-state switch provided by the embodiment of the present application;

[0082] Figures 12A - 12D Another part of the circuit diagram of the circuit breaker provided by the embodiment of the present application;

[0083] Figure 13 Another schematic flow chart of a method for detecting the state of a solid-state switch provided by the embodiment of the present application;

[0084] Figure 14 Another schematic flow chart of a method for detecting the state of a solid-state switch provided by the embodiment of the present application. Detailed implementation manners

[0085] The state detection circuit provided by the embodiment of the present application can be applied to any scenario including a solid-state switch. For example, the power supply loop of a photovoltaic system, the power loop of an electric vehicle, the charging loop of a charging pile, or each arm of an inverter, etc. The embodiment of the present application determines the state of the solid-state switch by adding a state detection circuit to the driving end, input end, and output end of the solid-state switch.

[0086] The following further describes the embodiment of the present application in detail with reference to the accompanying drawings.

[0087] See Figure 2 , Figure 2 which is a structural block diagram of a state detection circuit for a solid-state switch provided by the embodiment of the present application. As Figure 2 shown, the state detection circuit for a solid-state switch provided by the embodiment of the present application includes a first detection module 201, a second detection module 202, and a processing module 203.

[0088] The solid-state switch in the embodiments of the present application may be specifically implemented as a semiconductor switch such as a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), an Insulated Gate Bipolar Transistor (IGBT), or a Silicon Controlled Rectifier (SCR). The solid-state switch Q shown in the drawings of the embodiments of the present application 21 It should be understood that the IGBT is taken as an example for illustration, and it should not be construed as a limitation on the specific implementation manner of the solid-state switch.

[0089] In specific implementation, the first end of the first detection module 201 is coupled to the gate (i.e., the driving end) of the solid-state switch Q 21 and the second end of the first detection module 201 is coupled to the first end of the processing module 203; the first end of the second detection module 202 is coupled to the collector (i.e., the input end) of the solid-state switch Q 21 and the second end of the second detection module 202 is coupled to the emitter (i.e., the output end) of the solid-state switch Q 21 and the third end of the second detection module 202 is coupled to the second end of the processing module 203.

[0090] It should be noted that the "coupling" described in the present application refers to direct or indirect connection. For example, when A is coupled to B, it can be either that A is directly connected to B, or that A and B are indirectly connected through one or more other electrical components. For example, it can be that A is directly connected to C and C is directly connected to B, so that A and B are connected through C.

[0091] Wherein, the first detection module 201 can control the connection or disconnection between the first detection module 201 and the driving end of the solid-state switch Q 21 and send a first status detection signal to the processing module 203 according to the connection or disconnection between the first detection module 201 and the driving end of the solid-state switch Q 21 In some feasible embodiments, when the first detection module 201 is connected to the driving end of the solid-state switch Q

[0092] 21 it triggers the first detection module 201 to send a first status detection signal (such as 1) indicating the connection between the first detection module 201 and the driving end of the solid-state switch Q 21 to the processing module 203. Alternatively, when the first detection module 201 is connected to the driving end of the solid-state switch Q 2121 The driving end of the first detection module 201 is disconnected, triggering the first detection module 201 to send a signal to the processing module 203 indicating that the first detection module 201 and the solid-state switch Q 21 Optionally, the first detection module 201 and the solid-state switch Q 21 When the driving ends are disconnected, the first detection module 201 may not be triggered to send the first state detection signal to the processing module 203, that is, the first detection module 201 does not send a signal to the processing module 203 at this time.

[0093] The second detection module 202 can detect the solid-state switch Q 21 is turned on or off, and sends a second state detection signal to the processing module 203.

[0094] Similarly, in some feasible implementations, the solid-state switch Q 21 The second detection module 202 is triggered to send a signal indicating the solid-state switch Q to the processing module 203. 21 Alternatively, the solid-state switch Q 21 The second detection module 202 is triggered to send a signal characterizing the solid-state switch Q to the processing module 203. 21 The second state detection signal of the off state (eg, 0). Optionally, in the solid-state switch Q 21 In the case of shutdown, the second detection module 202 may not be triggered to send the second state detection signal to the processing module 203 , that is, the second detection module 202 does not send a signal to the processing module 203 at this time.

[0095] The processing module 203 can determine the solid-state switch Q according to the first state detection signal and the second state detection signal. 21 The solid-state switch Q 21 It includes the on state, the off state, the failure short circuit state and the failure open circuit state.

[0096] For example, when the first state detection signal indicates that the first detection module 201 is connected to the solid-state switch Q 21 The second state detection signal represents the solid-state switch Q 21 When the solid-state switch Q is turned on, illustratively, the first state detection signal is 0, the second state detection signal is 1, and the processing module 203 determines that the solid-state switch Q 21 It is in the failed short circuit state.

[0097] Alternatively, when the first state detection signal indicates that the first detection module 201 is in contact with the solid-state switch Q 21 The second state detection signal represents the solid-state switch Q 21When turned off, for example, the first state detection signal is 0, the second state detection signal is 0, and the processing module 203 determines that the solid-state switch Q 21 is in the off state.

[0098] Also, for example, when the first state detection signal indicates that the first detection module 201 is connected to the driving end of the solid-state switch Q 21 and the second state detection signal indicates that the solid-state switch Q 21 is turned off, for example, the first state detection signal is 1, the second state detection signal is 0, and it is determined that the state of the solid-state switch Q 21 is the open failure state.

[0099] Or, when the first state detection signal indicates that the first detection module 201 is connected to the driving end of the solid-state switch Q 21 and the second state detection signal indicates that the solid-state switch Q 21 is conducting, for example, the first state detection signal is 1, the second state detection signal is 1, and it is determined that the state of the solid-state switch Q 21 is the conducting state.

[0100] In summary, the relationship between the state of the solid-state switch Q 21 and the first state detection signal and the second state detection signal can be as shown in Table 1:

[0101] Table 1

[0102]

[0103]

[0104] The specific implementation principle of the embodiments of the present application is as follows: The first detection module controls and detects the connection or disconnection between the first detection module and the driving end of the solid-state switch. The second detection module detects the conduction or disconnection of the solid-state switch. The processing module determines the state of the solid-state switch based on the detection result of the first detection module (i.e., the first state detection signal) and the detection result of the second detection module (i.e., the second state detection signal). Different from the prior art where the state of the IGBT can be judged only when the voltage between the emitter and collector of the IGBT changes, the embodiments of the present application are based on the connection or disconnection between the first detection module and the driving end of the solid-state switch (i.e., whether a closed loop is formed in the first detection module), and whether a closed loop can be formed between the input end and the output end of the solid-state switch to determine the state of the solid-state switch. Since the closed loop is not affected by the voltage change between the input end and the output end of the solid-state switch, even if the voltage between the input end and the output end of the solid-state switch remains unchanged, the embodiments of the present application can still detect the state of the solid-state switch, with strong applicability.

[0105] The following combines Figures 3 to 5 to exemplarily illustrate the specific structure of the state detection circuit provided by the embodiments of the present application.

[0106] In some feasible implementation manners, in combination with Figure 3 and Figure 5 to exemplarily illustrate the specific structure of the first detection module 201.

[0107] Refer to Figure 3 , Figure 3 which is a circuit diagram of the first detection module provided by the embodiments of the present application. As Figure 3 shown, the first detection module 201 includes a first DC power supply V 31 , a first switch K 31 and a first signal acquisition unit U 31 .

[0108] Among them, Figure 5 is a circuit diagram of the state detection circuit of the solid-state switch provided by the embodiments of the present application. As Figure 3 and Figure 5 shown, one end of the first DC power supply V 31 is coupled to one end of the first switch K 31 , the other end of the first switch K 31 (i.e., the first end ) of the first detection module 201 is coupled to the driving end of the solid-state switch Q 21 and the first end of the first signal acquisition unit U 31 , the second end of the first signal acquisition unit U 31 is coupled to the other end of the first DC power supply V 31 , and the third end of the first signal acquisition unit U 31 (i.e., the second end ) of the first detection module 201 is coupled to the first end of the processing module 203.

[0109] It can be understood that Figure 3 takes one end of the first DC power supply V 31 as the positive extreme for illustration. Optionally, one end of the first DC power supply V 31 can also be the negative extreme, and the other end of the first DC power supply V 31 is the positive extreme (not shown in the figure).

[0110] In specific implementation, when the first switch K 31 controls the connection between the first DC power supply V 31 and the driving end of the solid-state switch Q 21 , the first DC power supply V 31 , the first switch K 31 and the first signal acquisition unit U 31Form a first closed loop and trigger the first signal acquisition unit U 31 Send a first status detection signal representing the connection between the first detection module 201 and the driving end of the solid-state switch Q to the processing module 203 21 .

[0111] In some feasible embodiments, the first switch K 31 Is specifically implemented as a toggle switch, relay, contactor or solid-state switch (such as IGBT, MOSFET, SCR, etc.).

[0112] Furthermore, in some feasible embodiments, the first detection module 201 further includes a first resistor R 31 And a second resistor R 32 .

[0113] The other end of the first switch K 31 Is coupled to one end of the first resistor R 31 , one end of the first resistor R 31 Is coupled to the driving end of the solid-state switch Q 21 And the first end of the first signal acquisition unit U 31 , the second end of the first signal acquisition unit U 31 Is coupled to one end of the second resistor R 32 , the other end of the second resistor R 32 Is coupled to the other end of the first DC power supply V 31 . At this time, the first resistor R 31 And the second resistor R 32 Can limit the current in the first closed loop formed in the first detection module 201 when the first switch K 31 Is turned on, and the voltage at the driving end of the solid-state switch Q 21 Is the voltage divided by the second resistor R 32 . Implementing the embodiments of the present application further improves the safety and reliability of the status detection circuit provided in the embodiments of the present application.

[0114] Optionally, in some feasible embodiments, the specific structure of the second detection module 202 will be described below by way of example in combination with Figure 4 And Figure 5 .

[0115] Refer to Figure 4 , Figure 4 Which is a circuit diagram of the second detection module provided by the embodiments of the present application. As Figure 4 Shown, the second detection module includes a second DC power supply V 42 And a second signal acquisition unit U 42 .

[0116] Among them, Figure 5This is a circuit diagram of the state detection circuit for the solid-state switch provided by the embodiment of the present application. As Figure 4 and Figure 5 shown, the positive terminal of the second DC power supply V 42 (i.e., the first terminal of the second detection module 202 ) is coupled to the input terminal of the solid-state switch Q 21 . The output terminal of the solid-state switch Q 21 is coupled to the first terminal of the second signal acquisition unit U 42 (i.e., the second terminal of the second detection module 202 ). The second terminal of the second signal acquisition unit U 42 is coupled to the negative terminal of the second DC power supply V 42 . The third terminal of the second signal acquisition unit U 42 (i.e., the third terminal of the second detection module 202 ) is coupled to the second terminal of the processing module 203.

[0117] In a specific implementation, when the solid-state switch Q 21 is turned on, the second DC power supply V 42 , the input terminal of the solid-state switch Q 21 , the output terminal of the solid-state switch Q 21 , and the second signal acquisition unit U 42 form a second closed loop, triggering the second signal acquisition unit U 42 to send a second state detection signal representing that the solid-state switch Q 21 is turned on to the processing module 203.

[0118] Optionally, the second detection module 202 further includes a first diode D 41 . Among them, the positive terminal of the second DC power supply V 42 is coupled to the anode of the first diode D 41 . The cathode of the first diode D 41 is coupled to the input terminal of the solid-state switch Q 21 . In the embodiment of the present application, the first diode D 41 can prevent the current of the solid-state switch Q 21 from flowing back and protect the second DC power supply V 42 .

[0119] Further, in some feasible embodiments, the second detection module 202 further includes a third resistor R 43 and a fourth resistor R 44 . Among them, the cathode of the first diode D 41 is coupled to one end of the third resistor R 43 . The other end of the third resistor R 43 is coupled to the input terminal of the solid-state switch Q 21 ; the second signal acquisition unit U42 The second end of which is coupled to the fourth resistor R 44 One end of the fourth resistor R 44 The other end of which is coupled to the second DC power supply V 42 The negative terminal of. At this time, the third resistor R 43 And the fourth resistor R 44 Can limit the current of the second closed loop formed in the second detection module 202, improving the safety and reliability of the state detection circuit provided in the embodiments of the present application.

[0120] Generally speaking, combining the foregoing Figures 2 to 4 The described embodiments, the state detection circuit provided by the embodiments of the present application can be obtained as Figure 5 Shown, wherein, the specific circuit structure of the first detection module 201 can refer to the foregoing embodiments described in combination with Figure 3 The described embodiments, the specific circuit structure of the second detection module 202 can refer to the foregoing embodiments described in combination with Figure 4 The described embodiments, which will not be elaborated here.

[0121] Optionally, in some feasible embodiments, as Figure 5 Shown, the solid-state switch Q 21 Is built into the circuit breaker, and the circuit breaker further includes a second diode D 52 、A third diode D 53 、A fourth diode D 54 And a fifth diode D 55 .

[0122] Among them, the input end of the solid-state switch Q 21 Is coupled to the cathode of the second diode D 52 And the cathode of the third diode D 53 , the output end of the solid-state switch Q 21 Is coupled to the anode of the fourth diode D 54 And the anode of the fifth diode D 55 ; The anode of the second diode D 52 And the cathode of the fourth diode D 54 Are coupled to the first end of the circuit breaker, and the anode of the third diode D 53 And the cathode of the fifth diode D 55 Are coupled to the second end of the circuit breaker. It should be explained that if the first end of the circuit breaker is the input end of the circuit breaker, then the second end of the circuit breaker is the output end of the circuit breaker; if the second end of the circuit breaker is the input end of the circuit breaker, then the first end of the circuit breaker is the output end of the circuit breaker. It can be understood that the second diode D 52 And the third diode D 53 Form a set of opposing diodes; The fourth diode D 54 And the fifth diode D55 Form a pair of opposing diodes.

[0123] The circuit breaker can be set between the third DC power supply and the load. Specifically, the input end of the circuit breaker is coupled to the third DC power supply, and the output end of the circuit breaker is coupled to the load. Specifically, when the first end of the circuit breaker is the input end of the circuit breaker and the second end of the circuit breaker is the output end of the circuit breaker, the conduction or cutoff of the solid-state switch Q 21 determines whether the third DC power supply supplies power to the load. When the solid-state switch Q 21 is conducting, the current of the third DC power supply can flow through the second diode D 52 into the input end of the solid-state switch, reach the output end of the solid-state switch, and then pass through the fifth diode D 55 to supply to the load. In another embodiment of the present application, when the second end of the circuit breaker is the input end of the circuit breaker and the first end of the circuit breaker is the output end of the circuit breaker, when the solid-state switch Q 21 is conducting, the current of the third DC power supply can flow through the third diode D 53 into the input end of the solid-state switch, reach the output end of the solid-state switch, and then pass through the fourth diode D 54 to supply to the load. Generally speaking, the second diode D 52 , the third diode D 53 , the fourth diode D 54 and the fifth diode D 55 enable the circuit breaker to be applicable to the scenario of bidirectional current flow, that is, the first end of the circuit breaker can be coupled to both the third DC power supply and the load.

[0124] Optionally, in some feasible embodiments, refer to Figure 6A , Figure 6A which is a partial circuit diagram of the circuit breaker provided by the embodiment of the present application. As Figure 6A shown, the circuit breaker provided by the embodiment of the present application may further include a disconnecting switch K 61 , and the disconnecting switch K 61 is in series with the solid-state switch Q 21 . Among them, the disconnecting switch K 61 is a switch device without arc extinguishing function, and can be specifically implemented as a relay, a contactor, etc.

[0125] At this time, the disconnecting switch K 61 is in series with the solid-state switch Q 21 . One end of the disconnecting switch K 61 (i.e., the input end of the circuit breaker) is coupled to the third DC power supply, and one end of the solid-state switch Q 21 (i.e., the output end of the circuit breaker) is coupled to the load.

[0126] Further, in some feasible embodiments, refer to Figure 6B , Figure 6B which is a partial circuit diagram of the circuit breaker provided by the embodiment of the present application. As Figure 6B shown, the circuit breaker of the embodiment of the present application, on the basis of including the disconnector K 61 , further includes a second diode D 52 , a third diode D 53 , a fourth diode D 54 and a fifth diode D 55 . In one embodiment, one end of the disconnector K 61 is coupled to the anode of the second diode D 52 and the cathode of the fourth diode D 54 . In this case, the other end of the disconnector K 61 is coupled to a third DC power supply, and the anode of the third diode D 53 and the cathode of the fifth diode D 55 are coupled to a load; or, the other end of the disconnector K 61 is coupled to a load, and the anode of the third diode D 53 and the cathode of the fifth diode D 55 are coupled to a third DC power supply. In another embodiment, one end of the disconnector K 61 is coupled to the anode of the third diode D 53 and the cathode of the fifth diode D 55 . In this case, the other end of the disconnector K 61 is coupled to a third DC power supply, and the anode of the second diode D 52 and the cathode of the fourth diode D 54 are coupled to a load; or, the other end of the disconnector K 61 is coupled to a load, and the anode of the second diode D 52 and the cathode of the fourth diode D 54 are coupled to a third direct current. It can be understood that Figure 6B the circuit breaker shown is Figure 6A compared with the circuit breaker shown in Figure 6B , the circuit breaker in

[0127] can be applied to the scenario where the current flows bidirectionally, and the applicability is better. Figure 7 and Figure 8 are used to introduce how to specifically control the solid-state switch Q 21 and the disconnector K 61 . It can be understood that whether it is Figure 6A the circuit breaker shown or Figure 6B the circuit breaker shown in Figure 7 and Figure 8 , they can both be applied to the state detection methods shown in

[0128] First, refer to Figure 7 , Figure 7 , which is a schematic flowchart of a method for detecting the state of a solid-state switch provided by an embodiment of the present application. As Figure 7 shown, the specific state detection method is as follows:

[0129] S701. The controller (such as Figure 2 the processing module 203 shown in

[0130] ) obtains a closing instruction for the circuit breaker. Among them, the controller can be specifically implemented as a micro control unit (MCU), a central processing unit (CPU), other general-purpose processors, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0131] It should be noted that in the present application, in order to better reflect the various data streams for the controller to detect the state of the solid-state switch Q 21 , the controller is divided into multiple units according to functions. In actual product applications, the processing module 201, the first signal acquisition unit U 31 and the second signal acquisition unit U 32 in the present application can be integrated into one chip or multiple chips that can establish a communication connection.

[0132] In some feasible embodiments, the closing instruction for the circuit breaker can be generated by the processing module 203 or received by the processing module 203. The present application embodiment does not limit the acquisition method of the closing instruction for the circuit breaker.

[0133] When the processing module 203 obtains the closing instruction for the circuit breaker, the closing sequence is to first close the disconnecting switch K 61 , and then close the solid-state switch Q 21 . Before closing the disconnecting switch K 61 in the present application embodiment, step S702 is executed.

[0134] S702. The controller (such as Figure 2 the processing module 203 shown in 21Whether the state is a failed short - circuit state.

[0135] In a specific implementation, the processing module 203 does not receive the first state detection signal indicating the turn - off between the first detection module 201 and the driving end of the solid - state switch Q 21 and the second state detection signal indicating the conduction of the solid - state switch Q 21 For example, what the processing module 203 receives is the first state detection signal indicating the turn - off between the first detection module 201 and the driving end of the solid - state switch Q 21 and the second state detection signal indicating the turn - off of the solid - state switch Q 21 For example, the first state detection signal is 0 and the second state detection signal is 0, that is, the solid - state switch Q 21 is in the off state; or, what the processing module 203 receives is the first state detection signal indicating the conduction between the first detection module 201 and the driving end of the solid - state switch Q 21 and the second state detection signal indicating the turn - off of the solid - state switch Q 21 For example, the first state detection signal is 1 and the second state detection signal is 0, that is, the solid - state switch Q 21 is in the failed open - circuit state. Generally speaking, the solid - state switch Q 21 is not in the failed short - circuit state, and since the processing module 203 will not control the solid - state switch Q 21 to conduct before the circuit breaker is closed, that is, as long as there is no connection between the input end and the output end of the solid - state switch Q 21 at this time, the processing module 203 executes step S703a.

[0136] Or, when the processing module 203 receives the first state detection signal indicating the turn - off between the first detection module 201 and the driving end of the solid - state switch Q 21 and the second state detection signal indicating the conduction of the solid - state switch Q 21 For example, the first state detection signal is 0 and the second state detection signal is 1, the processing module 203 determines that the state of the solid - state switch Q 21 is the failed short - circuit state, and then executes step S703b.

[0137] S703a. The controller (such as Figure 2 the processing module 203 shown in 61 controls the isolation switch K

[0138] In a specific implementation, when the processing module 203 determines that the solid - state switch Q 21 is not in the failed short - circuit state, it controls the isolation switch K 61 to conduct. Exemplarily, the processing module 203 can control the isolation switch K 61The coil current therein to control the disconnecting switch K 61 The main contact of is closed (i.e., to control the disconnecting switch K 61 To conduct). When there is no connection between the input terminal and the output terminal of the solid-state switch Q 21 During the conduction of the disconnecting switch K 61 There is no voltage across the two ends and no arc is generated. Moreover, after controlling the disconnecting switch K 61 To conduct, step S704 is continued to be executed.

[0139] S703b. The controller (such as Figure 2 The processing module 203 shown in) determines that the solid-state switch Q 21 Fails.

[0140] When the processing module 203 determines that the solid-state switch Q 21 Is in a failed short-circuit state, it is considered that the solid-state switch Q 21 Fails and does not control the disconnecting switch K 61 To conduct. At this time, the disconnecting switch K 61 Is in the off state. At this time, the circuit breaker closing fails.

[0141] S704. The controller (such as Figure 2 The processing module 203 shown in) determines whether the disconnecting switch K 61 Is conducting.

[0142] After the processing module 203 controls the disconnecting switch K 61 To conduct in step S703a, it can further determine whether the disconnecting switch K 61 Has conducted. In some feasible embodiments, the processing module 203 can detect the voltage across the two ends of the auxiliary contact of the disconnecting switch K 61 To determine whether the disconnecting switch K 61 Is conducting. Among them, the auxiliary contact of the disconnecting switch K 61 Has a linkage connection relationship with the main contact. For example, if the voltage across the two ends of the auxiliary contact of the disconnecting switch K 61 Is greater than the first preset voltage threshold (such as the third DC power supply voltage), the processing module 203 determines that the disconnecting switch K 61 Is conducting and continues to execute S705a.

[0143] S705a. After the processing module 203 controls the disconnecting switch K 61 To conduct, and after further confirming in step S704 that the disconnecting switch K 61 Has conducted, the controller (such as Figure 2 The processing module 203 shown in) can control the solid-state switch Q 21 To conduct. In a specific implementation, the processing module 203 sends a signal to the solid-state switch Q21 The driving end of [device] sends a high level to control the solid-state switch Q 21 to conduct. At this time, the circuit breaker closes successfully.

[0144] S705b. When the processing module 203 further confirms that the disconnecting switch K 61 is not conducting, the controller (such as Figure 2 the processing module 203 shown in [figure]) determines that the disconnecting switch K 61 has a fault. At this time, the circuit breaker fails to close.

[0145] In the embodiments of the present application, by determining whether to control the disconnecting switch to conduct according to the closing instruction for the circuit breaker and whether the state of the solid-state switch is a failed short-circuit state, it can be ensured that before controlling the disconnecting switch to conduct, the state of the solid-state switch is not a failed short-circuit state, that is, during the conduction process of the disconnecting switch, there is no voltage across the disconnecting switch, and the generation of electric arcs can be avoided. Implementing the embodiments of the present application can utilize the state detection result of the solid-state switch to control the closing of the circuit breaker, ensure the safety of the circuit breaker closing, and avoid accidents.

[0146] Figure 7 For the control method for closing the circuit breaker, the control method for opening the circuit breaker will be described below in conjunction with Figure 8 See Figure 8 , Figure 8 which is another schematic flowchart of the state detection method of the solid-state switch provided by the embodiments of the present application. As Figure 8 shown, the specific state detection method is as follows:

[0147] S801. The controller (such as Figure 2 the processing module 203 shown in [figure]) obtains the opening instruction for the circuit breaker.

[0148] In some feasible embodiments, the opening instruction for the circuit breaker can be generated by the processing module 203 or received by the processing module 203. The embodiments of the present application do not limit the acquisition method of the opening instruction for the circuit breaker.

[0149] When the processing module 203 obtains the opening instruction for the circuit breaker, the opening sequence is to first disconnect the solid-state switch Q 21 , and then disconnect the disconnecting switch K 61 .

[0150] S802. The controller (such as Figure 2 the processing module 203 shown in [figure]) controls the solid-state switch Q 21 to turn off. In a specific implementation, the processing module 203 sends a low level to the driving end of the solid-state switch Q 21 to control the solid-state switch Q21 Turn off.

[0151] S803. The controller (such as Figure 2 the processing module 203 shown in 21 determines whether the state of the solid-state switch Q Figure 7 is a failed short-circuit state. The specific implementation process can refer to step S702 in the embodiments described above in combination with

[0152] It can be understood that in the embodiments of the present application, before disconnecting the disconnecting switch K 61 , it is determined whether the state of the solid-state switch Q 21 is a failed short-circuit state.

[0153] When the state of the solid-state switch Q 21 is not in a failed short-circuit state, the processing module 203 executes step S804a. Optionally, the processing module 203 can further confirm whether the solid-state switch Q 21 has been turned off (not shown in the figure) before executing step S804a.

[0154] Optionally, when the processing module 203 determines that the state of the solid-state switch Q 21 is a failed short-circuit state, step S804b is executed.

[0155] S804a. The controller (such as Figure 2 the processing module 203 shown in 61 controls the disconnecting switch K

[0156] to turn off. 21 In specific implementation, when the processing module 203 determines that the solid-state switch Q 61 is not in a failed short-circuit state, it controls the disconnecting switch K 61 to turn off. Exemplarily, the processing module 203 can control the coil current in the disconnecting switch K 61 so as to control the main contacts of the disconnecting switch K 61 to turn off (that is, control the disconnecting switch K 21 to turn off). Similarly, when there is no connection between the input end and the output end of the solid-state switch Q 61 , there is no voltage at both ends during the turn-off process of the disconnecting switch K, and no arc is generated.

[0157] S804b. The controller (such as Figure 2 the processing module 203 shown in 21 determines that the solid-state switch Q

[0158] has a fault. 21 When the processing module 203 determines that the solid-state switch Q21 Fault, do not control the disconnector K 61 Turn off. At this time, the disconnector K 61 is in the conducting state. At this time, the circuit breaker fails to trip.

[0159] S805. The controller (such as Figure 2 the processing module 203 shown in 61 judges whether the disconnector K

[0160] After the processing module 203 controls the disconnector K 61 to turn off in step S804a, it can further determine whether the disconnector K 61 has been turned off. In some feasible embodiments, the processing module 203 can determine whether the disconnector K 61 is turned off by detecting the voltage across the auxiliary contacts of the disconnector K 61 . For example, if the voltage across the auxiliary contacts of the disconnector K 61 is less than the second preset voltage threshold (for example, 0), the processing module 203 determines that the disconnector K 61 has been turned off. At this time, the circuit breaker trips successfully.

[0161] S806. When the processing module 203 further confirms in step S805 that the disconnector K 61 is not turned off, the controller (such as Figure 2 the processing module 203 shown in 61 determines that the disconnector K

[0162] In the embodiments of the present application, by determining whether to control the disconnector to turn off according to the circuit breaker trip instruction and whether the state of the solid-state switch is a failed short-circuit state, it can be ensured that before controlling the disconnector to turn off, the state of the solid-state switch is not a failed short-circuit state, that is, during the turn-off process of the disconnector, there is no voltage across the disconnector, and the generation of arcs can be avoided. Implementing the embodiments of the present application can use the state detection result of the solid-state switch to control the circuit breaker to trip, ensure the safety of the circuit breaker trip, and avoid accidents.

[0163] Optionally, in some feasible embodiments, refer to Figure 9A , Figure 9A which is another part of the circuit diagram of the circuit breaker provided by the embodiments of the present application. As Figure 9A shown, the circuit breaker in the embodiments of the present application may further include a mechanical switch K 91 and a second diode D 52 , and one end of the mechanical switch K 91 is coupled to the anode of the second diode D 52 . The anode of the second diode D52 The cathode-coupled solid-state switch Q 21 The input terminal of the solid-state switch Q 21 The output terminal of the solid-state switch Q is coupled to the mechanical switch K 91 The other end of which, where the mechanical switch K 91 Is a switch with contacts, for example, can be specifically implemented as a relay, contactor, etc. It can be understood that the second diode D 52 Has an isolation function, the first end of the second detection module 202 Is coupled to the input terminal of the solid-state switch Q 21 If there is no second diode D 52 , then the current output from the first end of the second detection module 202 Can pass through the mechanical switch K 91 And return to the output terminal of the solid-state switch Q 21 , causing the second detection module 202 to form a closed loop, thus unable to detect the state of the solid-state switch Q 21 .

[0164] At this time, one end of the mechanical switch K 91 Is coupled to the anode of the second diode D 52 (which is the input terminal of the circuit breaker) to a third DC power supply, and the other end of the mechanical switch K 91 Is coupled to the output terminal of the solid-state switch Q 21 (which is the output terminal of the circuit breaker) to a load.

[0165] Furthermore, in some feasible embodiments, referring to Figure 9B , Figure 9B Is another part of the circuit diagram of the circuit breaker provided by the embodiment of the present application. As Figure 9B Shown, the circuit breaker of the embodiment of the present application, on the basis of including the mechanical switch K 91 And the second diode D 52 , further includes a third diode D 53 , a fourth diode D 54 And a fifth diode D 55 . At this time, one end of the mechanical switch K 91 Is coupled to the anode of the second diode D 52 And the cathode of the fourth diode D 54 To the third DC power supply / load, and the other end of the mechanical switch K 91 Is coupled to the anode of the third diode D 53 And the cathode of the fifth diode D 55 To the load / third DC power supply. Similarly, Figure 9B The circuit breaker shown in Figure 9A Compared with the circuit breaker shown in Figure 9BThe circuit breaker in it can be applied to scenarios where current flows bidirectionally, with better applicability.

[0166] It should be noted that in the circuit breaker structure shown in Figure 9A and Figure 9B , the embodiments of the present application can well overcome the defects existing in the prior art. For example, when the circuit breaker is in the closed state, the mechanical switch K 91 conducts. Since the internal resistance of the mechanical switch K 91 is small, at this time, regardless of the state of the solid-state switch Q 21 , the voltage between the input end and the output end of the solid-state switch Q 21 will not change. Then, the prior art cannot detect the state of the solid-state switch Q Figure 9A and Figure 9B shown in the circuit breaker. However, the state detection circuit provided by the embodiments of the present application does not depend on the voltage change between the input end and the output end of the solid-state switch Q 21 , and can still detect the state of the solid-state switch Q 21 . 21

[0167] Moreover, Figure 9A and Figure 9B the circuit breakers shown in can both be applied to the state detection methods shown in Figure 10 and Figure 11 .

[0168] First, refer to Figure 10 , Figure 10 which is another schematic flowchart of the state detection method of the solid-state switch provided by the embodiments of the present application. As Figure 10 shown, the specific state detection method includes:

[0169] S1001. The controller (such as the processing module 203 shown in Figure 2 ) obtains a closing instruction for the circuit breaker. The specific implementation can refer to step S701 in the embodiments described above in conjunction with Figure 7 , and will not be elaborated here.

[0170] When the processing module 203 obtains the closing instruction for the circuit breaker, the closing sequence is to first close the solid-state switch Q 21 , and then close the mechanical switch K 91 .

[0171] S1002. The controller (such as the processing module 203 shown in Figure 2 ) controls the solid-state switch Q 21 to conduct. In the specific implementation, the processing module 203 sends a high level to the driving end of the solid-state switch Q 21 to control the solid-state switch Q21 Turn on.

[0172] S1003. After the controller (such as the processing module 203 shown in Figure 2 ) turns on the solid-state switch Q, it determines whether the state of the solid-state switch Q 21 is an open failure state after turning on. 21 Specifically, in implementation, the processing module 203 does not receive the first state detection signal indicating the connection between the first detection module 201 and the driving end of the solid-state switch Q

[0173] , and the second state detection signal indicating the turn-off of the solid-state switch Q. For example, the first state detection signal received by the processing module 203 is the first state detection signal indicating the disconnection between the first detection module 201 and the driving end of the solid-state switch Q 21 , and the second state detection signal indicating the turn-on of the solid-state switch Q. For example, the first state detection signal is 0 and the second state detection signal is 1, that is, the solid-state switch Q 21 is in a short-circuit failure state. Generally speaking, the solid-state switch Q 21 is not in an open failure state. That is, as long as the input and output ends of the solid-state switch Q 21 are not turned off at this time, the processing module 203 executes step S1004a. 21 Or, when the processing module 203 receives the first state detection signal indicating the connection between the first detection module 201 and the driving end of the solid-state switch Q 21 , and the second state detection signal indicating the turn-off of the solid-state switch Q. For example, the first state detection signal is 1 and the second state detection signal is 0, the processing module 203 determines that the state of the solid-state switch Q 21 is an open failure state, and then executes step S1004b.

[0174] S1004a. The controller (such as the processing module 203 shown in 21 ) controls the mechanical switch K 21 to turn on. 21 Specifically, in implementation, when the processing module 203 determines that the solid-state switch Q

[0175] is not in an open failure state, it controls the mechanical switch K Figure 2 to turn on. Exemplarily, the processing module 203 can control the mechanical switch K 91 by controlling the coil current in the mechanical switch K

[0176] , so as to control the main contact of the mechanical switch K 21 to close (that is, the mechanical switch K 91 turns on). 91 Specifically, the processing module 203 can control the mechanical switch K 91 by controlling the coil current in the mechanical switch K 91 so that the main contact of the mechanical switch K

[0177] At this time, the processing module 203 controls the solid-state switch Q due to the execution of step S1002 21 , and further determines the solid-state switch Q through step S1003 21 Whether it is in a failed open state, so that before the processing module 203 controls the mechanical switch K 91 To conduct, ensure that there is no voltage across the mechanical switch K 91 During the conduction process, no arc is generated.

[0178] S1004b. The controller (such as Figure 2 The processing module 203 shown in) determines that the solid-state switch Q 21 Fails.

[0179] When the processing module 203 determines that the solid-state switch Q 21 Is in a failed open state, that is, it is considered that the solid-state switch Q 21 Fails and does not control the mechanical switch K 91 To conduct. At this time, the mechanical switch K 91 Is in the off state. At this time, the circuit breaker closing fails.

[0180] S1005. The controller (such as Figure 2 The processing module 203 shown in) determines whether the mechanical switch K 91 Is conducting.

[0181] After the processing module 203 controls the mechanical switch K to conduct in step S1004a 91 , it can further determine whether the mechanical switch K 91 Has conducted. In some feasible embodiments, the processing module 203 can detect the mechanical switch K 91 The voltage across the auxiliary contacts of, to determine whether the mechanical switch K 91 Is conducting. Among them, the auxiliary contacts of the mechanical switch K 91 Has a linkage connection relationship with the main contacts. For example, if the voltage across the auxiliary contacts of the mechanical switch K 91 Is greater than the third preset voltage threshold (for example, the third DC power supply voltage), the processing module 203 determines that the mechanical switch K 91 Is conducting. At this time, the circuit breaker closing is successful.

[0182] S1006. In the case where the processing module 203 further confirms that the mechanical switch K 91 Has not conducted, the controller (such as Figure 2 The processing module 203 shown in) determines that the mechanical switch K 91 Fails. At this time, the circuit breaker closing fails.

[0183] In the embodiment of the present application, it is determined whether to control the mechanical switch to conduct according to the closing instruction for the circuit breaker and whether the state of the solid-state switch is a failed open state. Then, it can be ensured that before the mechanical switch conducts, the state of the solid-state switch is not a failed open state, that is, when the mechanical switch conducts, there is no voltage across the mechanical switch, and the generation of electric arcs can be avoided.

[0184] Figure 10 For the control method for closing the circuit breaker, the control method for opening the circuit breaker will be described below in conjunction with Figure 11 Refer to Figure 11 , Figure 11 which is another schematic flowchart of the method for detecting the state of the solid-state switch provided by the embodiment of the present application.

[0185] As Figure 11 shown, the specific state detection method is as follows:

[0186] S1101. The controller (such as the processing module 203 shown in Figure 2 ) obtains the opening instruction for the circuit breaker.

[0187] In some feasible embodiments, the opening instruction for the circuit breaker may be generated by the processing module 203 or received by the processing module 203. The embodiment of the present application does not limit the acquisition method of the opening instruction for the circuit breaker.

[0188] When the processing module 203 obtains the opening instruction for the circuit breaker, the opening sequence is to first open the mechanical switch K 91 , and then open the solid-state switch Q 21 .

[0189] S1102. The controller (such as the processing module 203 shown in Figure 2 ) determines whether the state of the solid-state switch Q 21 is a failed open state. The specific implementation process can refer to step S1003 in the embodiment described above in conjunction with Figure 10 , and will not be elaborated here.

[0190] It can be understood that in the embodiment of the present application, it is determined whether the state of the solid-state switch Q 91 is a failed open state before opening the mechanical switch K 21 .

[0191] When the state of the solid-state switch Q 21 is not in a failed open state, the processing module 203 executes step S1103a. Optionally, the processing module 203 may further confirm whether the solid-state switch Q 21 is in a conducting state (not shown in the figure) before executing step S1103a.

[0192] Optionally, when the state of the solid-state switch Q 21 is in the open-failure state, the processing module 203 executes step S1103b.

[0193] S1103a. The controller (such as Figure 2 the processing module 203 shown in 91 turns off the mechanical switch K.

[0194] In a specific implementation, when the processing module 203 determines that the solid-state switch Q 21 is not in the open-failure state, it controls the mechanical switch K 91 to turn off. Exemplarily, the processing module 203 can control the mechanical switch K 91 by controlling the coil current in the mechanical switch K 91 so as to control the main contacts of the mechanical switch K 91 to turn off (i.e., control the mechanical switch K 91 to turn off). Similarly, when the input end and the output end of the solid-state switch Q 21 are connected, there is no voltage across the two ends during the process of turning off the mechanical switch K 91 , and no arc is generated.

[0195] S1103b. The controller (such as Figure 2 the processing module 203 shown in 21 determines a fault in the solid-state switch Q.

[0196] When the processing module 203 determines that the solid-state switch Q 21 is in the open-failure state, it considers that the solid-state switch Q 21 has a fault and does not control the mechanical switch K 91 to turn off. At this time, the mechanical switch K 91 is in the conducting state. At this time, the circuit breaker fails to trip.

[0197] S1104. The controller (such as Figure 2 the processing module 203 shown in 91 judges whether the mechanical switch K

[0198] is turned off. 91 After the processing module 203 controls the mechanical switch K 91 to turn off in step S1103a, it can further determine whether the mechanical switch K 91 has been turned off. In some feasible embodiments, the processing module 203 can detect the voltage across the auxiliary contacts of the mechanical switch K 91 to judge whether the mechanical switch K 91If the voltage across the two ends of the auxiliary contact is less than the fourth preset voltage threshold (e.g., 0), the processing module 203 determines that the mechanical switch K 91 has been turned off, and step S1105a is executed.

[0199] S1105a. When the processing module 203 further confirms through step S1104 that the mechanical switch K 91 has been turned off, the controller (e.g., Figure 2 the processing module 203 shown in 21 controls the solid-state switch Q

[0200] to turn off. At this time, the circuit breaker trips successfully. 21 Specifically, the processing module 203 sends a low level to the drive end of the solid-state switch Q 21 to control the solid-state switch Q

[0201] to turn off. 91 S1105b. When the processing module 203 further confirms through step S1104 that the mechanical switch K Figure 2 has not been turned off, the controller (e.g., 91 the processing module 203 shown in

[0202] determines that the mechanical switch K

[0203] has failed. At this time, the circuit breaker fails to trip. 21 , disconnecting switch K 61 , mechanical switch K 91 and second diode D 52 . See Figures 12A to 12D .

[0204] First, see Figure 12A , Figure 12A which is another part of the circuit diagram of the circuit breaker provided by the embodiment of the present application. As Figure 12A shown, the circuit breaker provided by the embodiment of the present application includes a solid-state switch Q 21 , disconnecting switch K 61 and, mechanical switch K 91 and second diode K 52 . Among them, the disconnecting switch K61 One end of the mechanical switch K is coupled in series with the solid-state switch 91 and one end of the second diode D 52 Anode of, isolating switch K 61 The other end (i.e., the input end of the circuit breaker) is coupled to the third DC power supply, and the second diode D 52 The cathode of is coupled to the input end of the solid-state switch Q 21 The output end of the solid-state switch Q 21 Is coupled to the other end of the mechanical switch K 91 The other end (i.e., the output end of the circuit breaker) is coupled to the load.

[0205] Optionally, one end of the isolating switch K 61 Can also be coupled to the output end of the solid-state switch Q 21 And the other end of the mechanical switch K 91 The other end of the isolating switch K 61 The other end is coupled to the load (not shown in the figure).

[0206] Optionally, in some feasible embodiments, the mechanical switch K 91 Can also be like Figure 12B The circuit breaker shown in, isolating switch K 61 One end is coupled to the anode of the second diode D 52 The other end of the isolating switch K 61 Is coupled to one end of the mechanical switch K 91 The other end (i.e., the input end of the circuit breaker) is coupled to the third DC power supply, and the second diode D 52 The cathode of is coupled to the input end of the solid-state switch Q 21 The output end of the solid-state switch Q 21 Is coupled to the other end of the mechanical switch K 91 The other end (i.e., the output end of the circuit breaker) is coupled to the load.

[0207] Furthermore, in some feasible embodiments, refer to Figure 12C , Figure 12C Is a partial circuit diagram of the circuit breaker provided by the embodiment of the present application. As Figure 12C Shown, the circuit breaker of the embodiment of the present application is based on Figure 12A On the basis of, it can also include the third diode D 53 、The fourth diode D 54 And the fifth diode D 55 。

[0208] Similarly, refer to Figure 12D , Figure 12D Is a partial circuit diagram of the circuit breaker provided by the embodiment of the present application. As Figure 12D Shown, the circuit breaker of the embodiment of the present application is based on Figure 12B On the basis of, it can also include the third diode D53 , the fourth diode D 54 and the fifth diode D 55 .

[0209] It can be understood that the circuit breaker shown in the embodiments of the present application Figure 12A and Figure 12B can be obtained by combining the circuit breaker shown in the foregoing Figure 6A . Figure 9A , Figure 12C and Figure 12D can be obtained by combining the circuit breaker shown in the foregoing Figure 6B . Figure 9B .

[0210] Next, in combination with Figure 13 and Figure 14 , how to specifically control the solid-state switch Q 21 , the disconnecting switch K 61 and the mechanical switch K 91 will be introduced. It can be understood that Figures 12A to 12D , all of which can be applied to Figure 13 and Figure 14 the state detection methods shown in

[0211] First, refer to Figure 13 , Figure 13 which is a schematic flowchart of a method for detecting the state of a solid-state switch provided by an embodiment of the present application. As Figure 13 shown, the specific state detection method is as follows:

[0212] S1301. The controller (such as the processing module 203 shown in Figure 2 ) obtains a closing instruction for the circuit breaker.

[0213] When the processing module 203 obtains a closing instruction for the circuit breaker, the closing sequence is to first close the disconnecting switch K 61 , then close the solid-state switch Q 21 , and finally close the mechanical switch K 91 . It can be understood that according to this closing sequence, the state detection method provided by the embodiment of the present application first executes the embodiment described in combination with the foregoing Figure 7 , and then executes the embodiment described in combination with the foregoing Figure 10 .

[0214] S1302. The controller (such as the processing module 203 shown in Figure 2 ) determines whether the state of the solid-state switch Q 21 is a failed short-circuit state. The specific implementation manner can refer to step S702 in the embodiment described in combination with the foregoing Figure 7 , and will not be elaborated here.

[0215] S1303a. The controller (such as the processing module 203 shown in Figure 2 ) controls the isolation switch K 61 to conduct. The specific implementation method can refer to step S703a in the embodiment described in combination with Figure 7 above, and will not be elaborated here.

[0216] S1303b. The controller (such as the processing module 203 shown in Figure 2 ) determines that the solid-state switch Q 21 is faulty. When the processing module 203 determines that the solid-state switch Q 21 is in a failed short-circuit state, it is considered that the solid-state switch Q 21 is faulty, and does not control the isolation switch K 61 to conduct. At this time, the isolation switch K 61 is in the off state. At this time, the circuit breaker fails to close.

[0217] S1304. The controller (such as the processing module 203 shown in Figure 2 ) determines whether the isolation switch K 61 is conducting. The specific implementation method can refer to step S704 in the embodiment described in combination with Figure 7 above, and will not be elaborated here.

[0218] S1305a. After the processing module 203 controls the isolation switch K 61 to conduct, and after further confirming through step S1304 that the isolation switch K 61 has conducted, the controller (such as the processing module 203 shown in Figure 2 ) can control the solid-state switch Q 21 to conduct.

[0219] S1305b. When the processing module 203 further confirms through step S1304 that the isolation switch K 61 has not conducted, the controller (such as the processing module 203 shown in Figure 2 ) determines that the isolation switch K 61 is faulty. At this time, the circuit breaker fails to close.

[0220] S1306. After the controller (such as the processing module 203 shown in Figure 2 ) controls the solid-state switch Q 21 to conduct in step S1305a, it determines whether the state of the solid-state switch is a failed open-circuit state. The specific implementation method can refer to step S1003 in the embodiment described in combination with Figure 10 above, and will not be elaborated here.

[0221] S1307a. The controller (such as the processing module 203 shown in Figure 2The processing module 203 shown in controls the mechanical switch K 91 to conduct. For the specific implementation method, reference can be made to step S1004a in the embodiments described above in conjunction with Figure 10 , which will not be elaborated here.

[0222] S1307b. The controller (such as Figure 2 the processing module 203 shown in determines that the solid-state switch Q 21 has a fault.

[0223] When the processing module 203 determines that the solid-state switch Q 21 is in a failed open state, it is considered that the solid-state switch Q 21 has a fault and does not control the mechanical switch K 91 to conduct. At this time, the mechanical switch K 91 is in an off state. At this time, the circuit breaker fails to close.

[0224] S1308. The controller (such as Figure 2 the processing module 203 shown in determines whether the mechanical switch K 91 is conducting. For the specific implementation method, reference can be made to step S1005 in the embodiments described above in conjunction with Figure 10 , which will not be elaborated here.

[0225] S1309. When the processing module 203 further confirms through step S1308 that the mechanical switch K 91 is not conducting, the controller (such as Figure 2 the processing module 203 shown in determines that the mechanical switch K 91 has a fault. At this time, the circuit breaker fails to close.

[0226] In the embodiment of the present application, by determining whether to control the disconnecting switch to conduct according to the closing instruction for the circuit breaker and whether the state of the solid-state switch is a failed short-circuit state, and determining whether to control the mechanical switch to conduct according to the closing instruction for the circuit breaker and whether the state of the solid-state switch is a failed open state. It can be ensured that before controlling the disconnecting switch to conduct, the state of the solid-state switch is not a failed short-circuit state, that is, there is no voltage across the disconnecting switch during the conduction process of the disconnecting switch; and before the mechanical switch conducts, the state of the solid-state switch is not a failed open state, that is, there is no voltage across the mechanical switch during the conduction process of the mechanical switch, thereby avoiding the generation of electric arcs. Implementing the embodiment of the present application can use the state detection result of the solid-state switch to control the closing of the circuit breaker, ensure the safety of the circuit breaker closing, and avoid accidents.

[0227] Figure 13 For the control method for closing the circuit breaker, the control method for opening the circuit breaker will be described below in conjunction with Figure 14 . Refer toFigure 14 , Figure 14 A schematic diagram of another method flow of a state detection method for a solid-state switch provided in an embodiment of the present application.

[0228] like Figure 14 As shown, the specific status detection method is as follows:

[0229] S1401, controller (e.g. Figure 2 The processing module 203 shown in FIG. 1 obtains a tripping instruction for the circuit breaker.

[0230] When the processing module 203 obtains the disconnection instruction for the circuit breaker, the disconnection sequence is to first disconnect the mechanical switch K 91 , then disconnect the solid-state switch Q 21 , and finally disconnect the isolating switch K 61 It is understandable that, according to the disconnection sequence, the state detection method provided in the embodiment of the present application is to first execute the above combined Figure 11 The described embodiment, and then perform the above combined Figure 8 Embodiment described.

[0231] S1402, controller (e.g. Figure 2 The processing module 203 shown in FIG. 2 determines whether the solid-state switch Q 21 The status is whether it is a fail-open state. For specific implementation methods, please refer to the previous article combined with Figure 11 Step S1102 in the described embodiment is not described in detail here.

[0232] S1403a, controller (e.g. Figure 2 The processing module 203 shown in FIG. 2 controls the mechanical switch K 91 For specific implementation methods, please refer to the previous article combined with Figure 11 Step S1103a in the described embodiment is not described in detail here.

[0233] S1403b, the processing module 203 determines the solid-state switch Q 21 In the case of a failed open circuit, the solid-state switch Q 21 Fault, does not control mechanical switch K 91 Turn off, at this time the mechanical switch K 91 The circuit breaker fails to open.

[0234] S1404, controller (e.g. Figure 2 The processing module 203 shown in FIG. 2 determines whether the mechanical switch K 91 Whether to shut down. For specific implementation methods, please refer to the previous article combined Figure 11 Step S1104 in the described embodiment is not described in detail here.

[0235] S1405a. When the processing module 203 further confirms through step S1104 that the mechanical switch K 91 has been turned off, the controller (such as Figure 2 the processing module 203 shown in 21 turns off the solid-state switch Q.

[0236] S1405b. When the processing module 203 further confirms through step S1104 that the mechanical switch K 91 has not been turned off, the controller (such as Figure 2 the processing module 203 shown in 91 determines that the mechanical switch K has a fault. At this time, the circuit breaker fails to trip.

[0237] S1406. The controller (such as Figure 2 the processing module 203 shown in 91 turns off the mechanical switch K in step S1403a, and after turning off the solid-state switch Q 21 in step S1405a, determines whether the state of the solid-state switch Q 21 is a failed short-circuit state. The specific implementation method can refer to step S803 in the embodiment described above in conjunction with Figure 8 and will not be elaborated here.

[0238] S1407a. The controller (such as Figure 2 the processing module 203 shown in 61 turns off the disconnecting switch K. The specific implementation method can refer to step S804a in the embodiment described above in conjunction with Figure 8 and will not be elaborated here.

[0239] S1407b. When the processing module 203 determines that the solid-state switch Q 21 is in a failed short-circuit state, it considers that the solid-state switch Q 21 has a fault and does not control the disconnecting switch K 61 to turn off. At this time, the disconnecting switch K 61 is in a conducting state. At this time, the circuit breaker fails to trip.

[0240] S1408. The controller (such as Figure 2 the processing module 203 shown in 61 determines whether the disconnecting switch K is turned off. The specific implementation method can refer to step S805 in the embodiment described above in conjunction with Figure 8 and will not be elaborated here.

[0241] When the processing module 203 determines that the disconnecting switch K 61 has been turned off. At this time, the circuit breaker trips successfully.

[0242] S1409. When the processing module 203 further confirms that the disconnector K 61 is not turned off through step S1408, the controller (such as Figure 2 the processing module 203 shown in) determines that the disconnector K 61 has a fault. At this time, the circuit breaker fails to trip.

[0243] In the embodiment of the present application, it is determined whether to control the disconnector to conduct according to the opening command for the circuit breaker and whether the state of the solid-state switch is a failed short-circuit state, and it is determined whether to control the mechanical switch to conduct according to the opening command for the circuit breaker and whether the state of the solid-state switch is a failed open circuit. Then, it can be ensured that before controlling the disconnector to turn off, the state of the solid-state switch is not a failed short-circuit state, that is, there is no voltage across the disconnector during the disconnection process of the disconnector; and before the mechanical switch is turned off, the state of the solid-state switch is not a failed open circuit state, that is, there is no voltage across the mechanical switch during the disconnection process of the mechanical switch, thereby avoiding the generation of electric arcs. Implementing the embodiment of the present application can use the state detection result of the solid-state switch to control the closing of the circuit breaker, ensure the safety of the circuit breaker closing, and avoid accidents.

[0244] It should be noted that the above terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0245] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A state detection circuit for a solid-state switch, characterized in that, The state detection circuit includes a first detection module, a second detection module, and a processing module; where a first end of the first detection module is coupled to a driving end of the solid-state switch, and a second end of the first detection module is coupled to a first end of the processing module; a first end of the second detection module is coupled to an input end of the solid-state switch, a second end of the second detection module is coupled to an output end of the solid-state switch, and a third end of the second detection module is coupled to a second end of the processing module; the first detection module is configured to control connection or disconnection between the first detection module and the driving end of the solid-state switch, and send a first state detection signal indicating connection or disconnection between the first detection module and the driving end of the solid-state switch to the processing module according to the connection or disconnection between the first detection module and the driving end of the solid-state switch; the second detection module is configured to send a second state detection signal indicating conduction or disconnection of the solid-state switch to the processing module according to conduction or disconnection of the solid-state switch; the processing module is configured to determine the state of the solid-state switch according to the first state detection signal and the second state detection signal.

2. The state detection circuit according to claim 1, characterized in that The processing module is configured to determine the state of the solid-state switch according to the first state detection signal and the second state detection signal, specifically including: when the first state detection signal indicates disconnection between the first detection module and the driving end of the solid-state switch, and the second state detection signal indicates conduction of the solid-state switch, the processing module is configured to determine that the solid-state switch is in a failed short-circuit state.

3. The state detection circuit according to claim 1, wherein The processing module is configured to determine the state of the solid-state switch according to the first state detection signal and the second state detection signal, specifically including: when the first state detection signal indicates connection between the first detection module and the driving end of the solid-state switch, and the second state detection signal indicates disconnection of the solid-state switch, the processing module is configured to determine that the state of the solid-state switch is a failed open-circuit state.

4. The state detection circuit according to any one of claims 1-3, characterized in that The first detection module includes a first DC power supply, a first switch, and a first signal acquisition unit; one end of the first DC power supply is coupled to one end of the first switch, the other end of the first switch is coupled to the driving end of the solid-state switch and a first end of the first signal acquisition unit, a second end of the first signal acquisition unit is coupled to the other end of the first DC power supply, and a third end of the first signal acquisition unit is coupled to the processing module; The first detection module is configured to control connection or disconnection between the first detection module and the driving end of the solid-state switch, and send a first state detection signal to the processing module according to the connection or disconnection between the first detection module and the driving end of the solid-state switch, specifically including: When the first switch controls the connection between the first DC power supply and the driving end of the solid-state switch, the first DC power supply, the first switch, the driving end of the solid-state switch, and the first signal acquisition unit form a first closed loop, triggering the first signal acquisition unit to send a first status detection signal to the processing module, which characterizes the connection between the first detection module and the driving end of the solid-state switch.

5. The state detection circuit according to claim 4, wherein The first detection module further includes a first resistor and a second resistor; The other end of the first switch is coupled to the driving end of the solid-state switch and the first end of the first signal acquisition unit, and the second end of the first signal acquisition unit is coupled to the other end of the first DC power supply, specifically including: The other end of the first switch is coupled to one end of the first resistor, the other end of the first resistor is coupled to the driving end of the solid-state switch and the first end of the first signal acquisition unit, the second end of the first signal acquisition unit is coupled to one end of the second resistor, and the other end of the second resistor is coupled to the other end of the first DC power supply.

6. The state detection circuit according to any one of claims 1-5, characterized in that, The second detection module includes a second DC power supply and a second signal acquisition unit; wherein, One end of the second DC power supply is coupled to the input end of the solid-state switch, the output end of the solid-state switch is coupled to the first end of the second signal acquisition unit, the second end of the second signal acquisition unit is coupled to the other end of the second DC power supply, and the third end of the second signal acquisition unit is coupled to the processing module; The second detection module is configured to send a second status detection signal to the processing module according to the conduction or cutoff of the solid-state switch, specifically including: When the solid-state switch is conducting, the second DC power supply, the input end of the solid-state switch, the output end of the solid-state switch, and the second signal acquisition unit form a second closed loop, triggering the second signal acquisition unit to send a second status detection signal to the processing module, which characterizes the conduction of the solid-state switch.

7. The state detection circuit according to claim 6, wherein The second detection module further includes a first diode; One end of the second DC power supply is coupled to the input end of the solid-state switch, specifically including: One end of the second DC power supply is coupled to the anode of the first diode, and the cathode of the first diode is coupled to the input end of the solid-state switch.

8. The state detection circuit according to claim 7, wherein The second detection module further includes a third resistor and a fourth resistor; The cathode of the first diode is coupled to the input end of the solid-state switch, specifically including: The cathode of the first diode is coupled to one end of the third resistor, and the other end of the third resistor is coupled to the input end of the solid-state switch; The second end of the second signal acquisition unit is coupled to the other end of the second DC power supply, specifically including: The second end of the second signal acquisition unit is coupled to one end of the fourth resistor, and the other end of the fourth resistor is coupled to the other end of the second DC power supply.

9. The state detection circuit according to any one of claims 1-8, characterized in that, The solid-state switch is built into the circuit breaker, and the circuit breaker further includes a second diode, a third diode, a fourth diode, and a fifth diode; wherein, The input terminal of the solid-state switch is coupled to the cathodes of the second diode and the third diode, and the output terminal of the solid-state switch is coupled to the anodes of the fourth diode and the fifth diode; The anode of the second diode and the cathode of the fourth diode are coupled to the first end of the circuit breaker, and the anode of the third diode and the cathode of the fifth diode are coupled to the second end of the circuit breaker; Wherein, the first end of the circuit breaker is the input terminal of the circuit breaker, and the second end of the circuit breaker is the output terminal of the circuit breaker; alternatively, the second end of the circuit breaker is the input terminal of the circuit breaker, and the first end of the circuit breaker is the output terminal of the circuit breaker.

10. The state detection circuit according to any one of claims 1-9, characterized in that, The solid-state switch is built into the circuit breaker; wherein, the circuit breaker further includes a disconnector, and the disconnector is connected in series with the solid-state switch; The processing module is further configured to control the disconnector to conduct or cut off according to an operation instruction for the circuit breaker and the state of the solid-state switch.

11. The state detection circuit according to claim 10, characterized in that, The state of the solid-state switch includes a failure short-circuit state; The processing module is further configured to control the disconnector to conduct or cut off according to an operation instruction for the circuit breaker and the state of the solid-state switch, specifically including: The processing module is further configured to control the disconnector to conduct according to a closing instruction for the circuit breaker and the state of the solid-state switch not being the failure short-circuit state; The processing module is further configured to control the solid-state switch to conduct after controlling the disconnector to conduct.

12. The state detection circuit according to claim 10 or 11, characterized in that, The state of the solid-state switch includes a failure short-circuit state; The processing module is further configured to control the disconnector to conduct or cut off according to an operation instruction for the circuit breaker and the state of the solid-state switch, specifically including: The processing module is further configured to control the disconnector to cut off according to a tripping instruction for the circuit breaker and detecting that the state of the solid-state switch is not the failure short-circuit state after controlling the solid-state switch to cut off.

13. The state detection circuit according to any one of claims 1-12, characterized in that, The solid-state switch is built into the circuit breaker; wherein, the circuit breaker further includes a mechanical switch and a second diode; one end of the mechanical switch is coupled to the anode of the second diode, the cathode of the second diode is coupled to the input terminal of the solid-state switch, and the output terminal of the solid-state switch is coupled to the other end of the mechanical switch; The processing module is further configured to control the mechanical switch to conduct or cut off according to an operation instruction for the circuit breaker and the state of the solid-state switch.

14. The state detection circuit according to claim 13, characterized in that The circuit breaker further includes a disconnector, One end of the mechanical switch is coupled to the anode of the second diode, specifically including: One end of the disconnector is coupled to one end of the mechanical switch and the anode of the second diode; alternatively, one end of the disconnector is coupled to the anode of the second diode, and the other end of the disconnector is coupled to one end of the mechanical switch.

15. The state detection circuit according to claim 13 or 14, characterized in that, The state of the solid-state switch includes a failure open-circuit state; The processing module is further configured to control the mechanical switch to conduct or cut off according to an operation instruction for the circuit breaker and the state of the solid-state switch, specifically including: The processing module is further configured to control the mechanical switch to conduct according to the closing instruction for the circuit breaker and the fact that the state of the solid-state switch is not the failed open state after detecting that the solid-state switch is conducting.

16. The state detection circuit according to any one of claims 13-15, characterized in that, The state of the solid-state switch includes the failed open state; The processing module is further configured to control the mechanical switch to conduct or turn off according to the operation instruction for the circuit breaker and the state of the solid-state switch, specifically including: The processing module is further configured to control the mechanical switch to turn off according to the opening instruction for the circuit breaker and the fact that the state of the solid-state switch is not the failed open state; The processing module is further configured to control the solid-state switch to turn off after controlling the mechanical switch to turn off.

17. A method for detecting the state of a solid-state switch, characterized in that, The driving end of the solid-state switch is coupled to the first end of the first detection module, and the second end of the first detection module is coupled to the first end of the processing module; the input end of the solid-state switch is coupled to the first end of the second detection module, and the second end of the second detection module is coupled to the output end of the solid-state switch; The third end of the second detection module is coupled to the second end of the processing module The state detection method includes: Controlling the connection or disconnection between the first detection module and the driving end of the solid-state switch, and generating a first state detection signal representing the connection or disconnection between the first detection module and the driving end of the solid-state switch according to the connection or disconnection between the first detection module and the driving end of the solid-state switch; Generating a second state detection signal representing the conduction or turn-off of the solid-state switch according to the conduction or turn-off of the solid-state switch; Determining the state of the solid-state switch according to the first state detection signal and the second state detection signal.

18. The state detection method according to claim 17, wherein The determining the state of the solid-state switch according to the first state detection signal and the second state detection signal specifically includes: When the first state detection signal represents the disconnection between the first detection module and the driving end of the solid-state switch, and the second state detection signal represents the conduction of the solid-state switch, determining that the solid-state switch is in the failed short state; Or, when the first state detection signal represents the connection between the first detection module and the driving end of the solid-state switch, and the second state detection signal represents the turn-off of the solid-state switch, determining that the state of the solid-state switch is the failed open state.

19. The state detection method according to claim 17 or 18, characterized in that, The solid-state switch is built in the circuit breaker; wherein, the circuit breaker further includes a disconnector, and the disconnector is connected in series with the solid-state switch; The state detection method further includes: Controlling the disconnector to conduct or turn off according to the operation instruction for the circuit breaker and the state of the solid-state switch.

20. The state detection method according to claim 19, characterized in that, The state of the solid-state switch includes the failed short state; The controlling the disconnector to conduct or turn off according to the operation instruction for the circuit breaker and the state of the solid-state switch specifically includes: Controlling the disconnector to conduct according to the closing instruction for the circuit breaker and the fact that the state of the solid-state switch is not the failed short state; And controlling the solid-state switch to conduct after controlling the disconnector to conduct.

21. The state detection method according to claim 19 or 20, characterized in that, The state of the solid-state switch includes a failed short-circuit state; Controlling the disconnector to conduct or disconnect according to the operation instruction for the circuit breaker and the state of the solid-state switch specifically includes: According to the opening instruction for the circuit breaker and detecting that the state of the solid-state switch is not the failed short-circuit state after controlling the solid-state switch to disconnect, controlling the disconnector to disconnect.

22. The state detection method according to any one of claims 17-21, characterized in that, The solid-state switch is built into the circuit breaker; wherein, the circuit breaker further includes a mechanical switch and a second diode; one end of the mechanical switch is coupled to the anode of the second diode, the cathode of the second diode is coupled to the input end of the solid-state switch, and the output end of the solid-state switch is coupled to the other end of the mechanical switch; The state detection method further includes: Controlling the mechanical switch to conduct or disconnect according to the operation instruction for the circuit breaker and the state of the solid-state switch.

23. The state detection method according to claim 22, wherein The state of the solid-state switch includes a failed open-circuit state; Controlling the mechanical switch to conduct or disconnect according to the operation instruction for the circuit breaker and the state of the solid-state switch specifically includes: According to the closing instruction for the circuit breaker and detecting that the state of the solid-state switch is not the failed open-circuit state after controlling the solid-state switch to conduct, controlling the mechanical switch to conduct.

24. The state detection method according to any one of claims 22 or 23, characterized in that The state of the solid-state switch includes a failed open-circuit state; Controlling the mechanical switch to conduct or disconnect according to the operation instruction for the circuit breaker and the state of the solid-state switch specifically includes: According to the opening instruction for the circuit breaker and the state of the solid-state switch not being the failed open-circuit state, controlling the mechanical switch to disconnect; And after controlling the mechanical switch to disconnect, controlling the solid-state switch to disconnect.

25. A circuit breaker, characterized in that, The circuit breaker includes a solid-state switch and the state detection circuit according to any one of claims 1-16; wherein, the state detection circuit is used to determine the state of the solid-state switch.

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