Circuit breaker, electronic device and method of driving a circuit breaker

Abstract

This application relates to a circuit breaker, electronic equipment, and a method for driving the circuit breaker. The driving circuit includes a first suppression circuit and a second suppression circuit; the first suppression circuit is connected to the control electrode of a first switching transistor and a controller external to the circuit breaker, respectively; the second suppression circuit is connected to the control electrode of the second switching transistor and the controller, respectively; the first suppression circuit is used to transmit the control signal from the controller to the second switching transistor and suppress the crosstalk current generated during the turn-on and turn-off of the second switching transistor; the second suppression circuit is used to transmit the control signal from the controller to the first switching transistor and suppress the crosstalk current generated during the turn-on and turn-off of the first switching transistor. Using this application, bidirectional suppression of both positive and negative crosstalk can be achieved, enhancing the reliability of the circuit.

Description

Technical Field

[0001] This application relates to the field of DC power distribution system protection technology, and in particular to a circuit breaker, electronic equipment, and a method for driving the circuit breaker. Background Technology

[0002] As DC power distribution systems develop towards higher voltage and larger capacity, DC solid-state circuit breakers, as core protection devices, need to have faster breaking speeds and higher withstand voltage capabilities.

[0003] DC solid-state circuit breakers use SiC MOSFETs as the main switching transistors. However, SiC MOSFETs are prone to crosstalk problems during high-speed switching. Traditional driving methods only suppress forward crosstalk, which can easily lead to excessive negative bias of the SiC MOSFET gate voltage, affecting device reliability. Summary of the Invention

[0004] Therefore, it is necessary to provide a circuit breaker, electronic device, and circuit breaker driving method that can achieve bidirectional suppression of positive and negative crosstalk, addressing the aforementioned technical problems.

[0005] In a first aspect, this application provides a circuit breaker. The circuit breaker includes a first switching transistor, a second switching transistor, and a drive circuit; the first terminal of the first switching transistor is connected to a power supply, the second terminal of the first switching transistor is connected to the first terminal of a second switching transistor, and the second terminal of the second switching transistor is connected to an electrical device; the drive circuit includes a first suppression circuit and a second suppression circuit; the first suppression circuit is connected to the control terminal of the first switching transistor and a controller outside the circuit breaker, respectively, and the second suppression circuit is connected to the control terminal of the second switching transistor and the controller, respectively; the first suppression circuit is used to transmit the control signal of the controller to the second switching transistor and suppress the crosstalk current generated during the turn-on and turn-off of the second switching transistor; the second suppression circuit is used to transmit the control signal of the controller to the first switching transistor and suppress the crosstalk current generated during the turn-on and turn-off of the first switching transistor.

[0006] In the technical solution of this application embodiment, the first suppression circuit and the second suppression circuit suppress the crosstalk current generated by the first switch and the second switch at the moment of conduction and turn-off, respectively, effectively clamping the gate negative voltage spike and preventing the switch from being mis-turned on, thereby giving the circuit breaker a higher anti-interference capability.

[0007] In some embodiments, the first suppression circuit includes a first clamping resistor, a first bleeder capacitor, a first positive suppression branch, and a first negative suppression branch; a first terminal of the first clamping resistor is connected to a controller, and a second terminal of the first clamping resistor is connected to the control electrode of a first switching transistor; a first terminal of the first positive suppression branch is connected to a first terminal of the first clamping resistor, a second terminal of the first positive suppression branch is connected to a second terminal of the first clamping resistor, and a third terminal of the first positive suppression branch is connected to a first terminal of the first bleeder capacitor; a first terminal of the first negative suppression branch is connected to a first terminal of the first clamping resistor. The second end of the first negative suppression branch is connected to the second end of the first clamping resistor, and the third end of the first negative suppression branch is connected to the first end of the first bleeder capacitor. The first positive suppression branch is used to conduct when the voltage across the first clamping resistor reaches a first preset voltage, so that the positive crosstalk current generated by the second switch at the moment of conduction is discharged through the first bleeder capacitor. The first negative suppression branch is used to conduct when the voltage across the first clamping resistor reaches a second preset voltage, so that the negative crosstalk current generated by the second switch at the moment of turn-off is discharged through the first bleeder capacitor. In the technical solution of this application embodiment, bidirectional suppression of positive and negative crosstalk is achieved by designing the first positive suppression branch, the first negative suppression branch, the first clamping resistor, and the first bleeder capacitor, thereby enhancing the robustness of the circuit.

[0008] In some embodiments, the first forward suppression branch includes a first transistor and a first bleeder resistor; the base of the first transistor is connected to the controller, the collector of the first transistor is connected to the first end of the first bleeder capacitor, and the emitter of the first transistor is connected to the second end of the first clamping resistor; the first end of the first bleeder resistor is connected to the emitter of the first transistor, and the second end of the first bleeder resistor is connected to the collector of the first transistor. In the technical solution of this application embodiment, the first forward suppression branch uses a first transistor in conjunction with a first bleeder resistor, which can quickly conduct when forward crosstalk occurs, providing a low-impedance discharge path for crosstalk current and improving circuit reliability.

[0009] In some embodiments, the first negative suppression branch includes a second transistor, a first diode, and a second bleeder resistor. The base of the second transistor is connected to the controller, the collector of the second transistor is connected to the first terminal of the first bleeder capacitor, and the emitter of the second transistor is connected to the anode of the first diode. The cathode of the first diode is connected to the second terminal of the first clamping resistor. The first terminal of the second bleeder resistor is connected to the emitter of the second transistor, and the second terminal of the second bleeder resistor is connected to the collector of the second transistor. In the technical solution of this application embodiment, the first negative suppression branch uses a second transistor as a switching element, which, together with the first diode, achieves reverse clamping, guides the negative crosstalk current into the first bleeder capacitor, and is absorbed by the first bleeder capacitor, thereby improving the reliability of the drive circuit under negative crosstalk conditions.

[0010] In some embodiments, the second suppression circuit includes a second clamping resistor, a second bleeder capacitor, a second positive suppression branch, and a second negative suppression branch; a first terminal of the second clamping resistor is connected to the controller, and a second terminal of the second clamping resistor is connected to the control electrode of the second switching transistor; a first terminal of the second positive suppression branch is connected to the first terminal of the second clamping resistor, a second terminal of the second positive suppression branch is connected to the second terminal of the second clamping resistor, and a third terminal of the second positive suppression branch is connected to the first terminal of the second bleeder capacitor; a first terminal of the second negative suppression branch is connected to the first terminal of the second clamping resistor. The second negative suppression branch is connected to the second clamping resistor, and the third terminal of the second negative suppression branch is connected to the first terminal of the second bleeder capacitor. The second positive suppression branch is used to conduct when the voltage across the second clamping resistor reaches a first preset voltage, so that the positive crosstalk current generated by the first switching transistor at the moment of conduction is discharged through the second bleeder capacitor. The second negative suppression branch is used to conduct when the voltage across the second clamping resistor reaches a second preset voltage, so that the negative crosstalk current generated by the first switching transistor at the moment of turn-off is discharged through the second bleeder capacitor. In the technical solution of this application embodiment, the second suppression circuit, through the provided second positive suppression branch and second negative suppression branch, can suppress the positive and negative crosstalk generated at the moment of turn-on and turn-off of the first switching transistor, respectively, thereby improving the bidirectional crosstalk suppression capability and operational reliability of the drive circuit.

[0011] In some embodiments, the second forward suppression branch includes a third transistor and a third bleeder resistor; the base of the third transistor is connected to the controller, the collector of the third transistor is connected to the first end of the second bleeder capacitor, and the emitter of the third transistor is connected to the second end of the second clamping resistor; the first end of the third bleeder resistor is connected to the emitter of the third transistor, and the second end of the third bleeder resistor is connected to the collector of the third transistor. In the technical solution of this application embodiment, the second forward suppression branch adopts the same circuit structure as the first forward suppression branch. Through the cooperation of the third transistor and the third bleeder resistor, it responds quickly when the first switching transistor is turned on and causes forward crosstalk, providing a low-impedance discharge path for the crosstalk current, so that the entire driving circuit has symmetrical and comprehensive forward crosstalk suppression capability.

[0012] In some embodiments, the second negative suppression branch includes a fourth transistor, a second diode, and a fourth bleeder resistor; the base of the fourth transistor is connected to the controller, the collector of the fourth transistor is connected to the first terminal of the second bleeder capacitor, and the emitter of the fourth transistor is connected to the anode of the second diode; the cathode of the second diode is connected to the second terminal of the second clamping resistor; the first terminal of the fourth bleeder resistor is connected to the emitter of the fourth transistor, and the second terminal of the fourth bleeder resistor is connected to the collector of the fourth transistor. In the technical solution of this application embodiment, the second negative suppression branch adopts the same circuit structure as the first negative suppression branch. Through the cooperation of the fourth transistor, the second diode, and the fourth bleeder resistor, it responds quickly when the first switch is turned off, causing negative crosstalk, and directs the crosstalk current into the second bleeder capacitor for absorption, so that the entire driving circuit has symmetrical and comprehensive negative crosstalk suppression capability.

[0013] Secondly, this application also provides an electronic device. The electronic device includes a controller and the aforementioned circuit breaker; the circuit breaker includes a first switching transistor, a second switching transistor, and a drive circuit; the first and second switching transistors are used to receive control signals transmitted by the controller through the drive circuit, and to connect or disconnect the power supply and the electrical equipment according to the control signals; the drive circuit is used to suppress crosstalk currents generated at the moment the first switching transistor is turned on and off, and to suppress crosstalk currents generated at the moment the second switching transistor is turned on and off.

[0014] In the technical solution of this application embodiment, the control signal issued by the controller is transmitted to the first switch and the second switch via the drive circuit. While performing the turn-on and turn-off control, the drive circuit suppresses the crosstalk current generated at the moment of turn-on and turn-off of the two switches respectively, effectively eliminating the gate negative voltage spike, thereby improving the operational reliability and service life of the electronic equipment.

[0015] Thirdly, this application also provides a method for driving a circuit breaker. The method includes:

[0016] Receive control signals transmitted from the controller outside the drive circuit;

[0017] The first and second switching transistors in the circuit breaker are switched on according to the control signal to conduct the connection between the electrical equipment and the power supply.

[0018] The first and second switching transistors in the circuit breaker are disconnected according to the control signal to cut off the connection between the electrical equipment and the power supply.

[0019] Suppress crosstalk currents generated during turn-on and turn-off.

[0020] In the technical solution of this application embodiment, the driving circuit suppresses the crosstalk current generated when the first switch is turned on or off, and also suppresses the crosstalk current generated when the second switch is turned on or off, effectively clamping the gate negative voltage spike and preventing the first or second switch from being mis-turned on, thereby improving the high reliability of the driving circuit in complex situations.

[0021] In some embodiments, suppressing crosstalk currents generated at the turn-on and turn-off moments includes: discharging crosstalk currents generated at the turn-on and turn-off moments of the second switch through a first suppression circuit in the driving circuit; and discharging crosstalk currents generated at the turn-on and turn-off moments of the first switch through a second suppression circuit in the driving circuit. In the technical solution of this application embodiment, the first suppression circuit discharges the crosstalk current generated at the turn-on and turn-off moments of the second switch, and the second suppression circuit discharges the crosstalk current generated at the turn-on and turn-off moments of the first switch. This achieves comprehensive suppression of crosstalk currents generated by the two switches at the turn-on and turn-off moments, effectively preventing the switches from mis-turning or breaking down due to crosstalk, and improving circuit reliability. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the circuit breaker in one embodiment;

[0024] Figure 2 This is a schematic diagram of the structure of the first suppression circuit in a circuit breaker in one embodiment;

[0025] Figure 3 This is a schematic diagram of the structure of the first positive suppression branch in the first suppression circuit of one embodiment;

[0026] Figure 4 This is a schematic diagram of the structure of the first negative suppression branch in the first suppression circuit in another embodiment;

[0027] Figure 5 This is a schematic diagram of the structure of the second suppression circuit in a circuit breaker in one embodiment;

[0028] Figure 6 This is a schematic diagram of the structure of an electronic device in one embodiment;

[0029] Figure 7This is a flowchart illustrating a circuit breaker driving method in one embodiment;

[0030] Figure 8 This is a flowchart illustrating the circuit breaker driving method in another embodiment.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Circuit breaker; 2. Drive circuit; 3. Controller; 4. Power supply; 5. Electrical equipment;

[0033] 10. First suppression circuit; 20. Second suppression circuit;

[0034] 101. First positive suppression branch; 102. First negative suppression branch;

[0035] 201. Second positive suppression branch; 202. Second negative suppression branch;

[0036] MOSFET-A, the first switching transistor; MOSFET-B, the second switching transistor;

[0037] First clamping resistor; Second clamping resistor;

[0038] First bleeder capacitor; Second bleeder capacitor;

[0039] First diode; Second diode;

[0040] First transistor; Second and third transistors; , third transistor; Fourth transistor;

[0041] First bleeder resistor; Second bleeder resistor; Third bleeder resistor; Fourth bleed resistor. Detailed Implementation

[0042] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0044] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0045] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0046] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0047] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0048] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0049] As DC power distribution systems develop towards higher voltage and larger capacity, DC solid-state circuit breakers, as core protection devices, need to have faster breaking speeds and higher withstand voltage capabilities. DC solid-state circuit breakers use SiC MOSFETs as the main switching transistors; however, SiC MOSFETs are prone to crosstalk problems during high-speed switching. Traditional drive methods only suppress forward crosstalk, which can easily lead to excessive negative bias of the SiC MOSFET gate voltage, affecting device reliability.

[0050] This application provides a circuit breaker, which includes a first switching transistor, a second switching transistor, and a driving circuit. The driving circuit includes a first suppression circuit and a second suppression circuit. The first suppression circuit and the second suppression circuit suppress the crosstalk current generated by the first switching transistor and the second switching transistor at the moment of conduction and turn-off, respectively, effectively clamping the gate negative voltage spike and preventing the switching transistor from being mis-turned on, thereby giving the circuit breaker a higher anti-interference capability.

[0051] The circuit breaker provided in this application is not only applicable to DC solid-state circuit breakers, but can also be applied to other electronic devices that require short-circuit protection or high-speed switching. The technical solutions involved in the embodiments of this application are described below.

[0052] According to some embodiments of this application, refer to Figure 1 A circuit breaker is provided. The circuit breaker 1 includes a first switching transistor MOSFET-A, a second switching transistor MOSFET-B, and a drive circuit 2. The first terminal of the first switching transistor MOSFET-A is connected to a power supply 4, the second terminal of the first switching transistor MOSFET-A is connected to the first terminal of the second switching transistor MOSFET-B, and the second terminal of the second switching transistor MOSFET-B is connected to an electrical device 5. The drive circuit 2 includes a first suppression circuit 10 and a second suppression circuit 20. The first suppression circuit 10 is connected to the control terminal of the first switching transistor MOSFET-A and a controller 3 external to the circuit breaker, respectively. The second suppression circuit 20 is connected to the control terminal of the second switching transistor MOSFET-B and the controller 3, respectively. The first suppression circuit 10 is used to transmit the control signal of the controller 3 to the second switching transistor MOSFET-B and suppress the crosstalk current generated during the turn-on and turn-off of the second switching transistor MOSFET-B. The second suppression circuit 20 is used to transmit the control signal of the controller 3 to the first switching transistor MOSFET-A and suppress the crosstalk current generated during the turn-on and turn-off of the first switching transistor MOSFET-A.

[0053] In this embodiment of the application, the circuit breaker 1 includes a drive circuit 2, a first switching transistor MOSFET-A and a second switching transistor MOSFET-B. The first switching transistor MOSFET-A is connected to the power supply 4, the first suppression circuit 10 and the second switching transistor MOSFET-B, respectively. The second switching transistor MOSFET-B is connected to the electrical equipment 5 and the second suppression circuit 20, respectively. The first suppression circuit 10 and the second suppression circuit 20 are connected to the controller 3, respectively.

[0054] In this application, when one MOSFET turns on, its voltage drops rapidly, generating a crosstalk current in the other MOSFET. For the first suppression circuit 10, when the second switching transistor MOSFET-B turns on, a voltage change occurs on MOSFET-B at the instant of its turn-on. This voltage change passes through the first switching transistor MOSFET-A and generates a crosstalk current in MOSFET-A. This crosstalk current flows to the first suppression circuit 10, which suppresses the crosstalk current. When the second switching transistor MOSFET-B turns off, a voltage change also occurs on MOSFET-B at the instant of its turn-off. This voltage change passes through the first switching transistor MOSFET-A and generates a crosstalk current in MOSFET-A. This crosstalk current flows to the first suppression circuit 10, which also suppresses the crosstalk current. The second suppression circuit 20 suppresses the crosstalk current in the same way as the first suppression circuit 10, i.e., it suppresses the crosstalk current generated on the second switching transistor MOSFET-B at the instant the first switching transistor MOSFET-A turns on and off. This will not be elaborated further here.

[0055] In the above embodiments, a symmetrical crosstalk suppression architecture is constructed by setting a first suppression circuit 10 and a second suppression circuit 20 that are respectively connected to the control electrodes of the first and second switching transistors. The two suppression circuits suppress the crosstalk current generated at the moment when the other switching transistor is turned on and off, respectively, which effectively avoids the switching transistor from being mistakenly turned on due to crosstalk and improves the operational reliability of the circuit.

[0056] According to some embodiments of this application, refer to Figure 2 The first suppression circuit 10 includes a first clamping resistor. First discharge capacitor First positive suppression branch 101 and first negative suppression branch 102; first clamping resistor The first terminal is connected to controller 3, and the first clamping resistor The second terminal is connected to the control electrode of the first switching transistor MOSFET-A; the first terminal of the first forward suppression branch 101 is connected to the first clamping resistor. The first terminal is connected, and the second terminal of the first positive suppression branch 101 is connected to the first clamping resistor. The second terminal is connected, and the third terminal of the first positive suppression branch 101 is connected to the first discharge capacitor. The first terminal is connected; the first terminal of the first negative suppression branch 102 is connected to the first clamping resistor. The first terminal is connected, and the second terminal of the first negative suppression branch 102 is connected to the first clamping resistor. The second terminal is connected, and the third terminal of the first negative suppression branch 102 is connected to the first discharge capacitor. The first terminal is connected; the first positive suppression branch 101 is used for the first clamping resistor. When the resistor voltage reaches the first preset voltage, the transistor is turned on, so that the positive crosstalk current generated at the moment of turn-on of the second switching transistor MOSFET-B passes through the first discharge capacitor. Discharge; First negative suppression branch 102, used for the first clamping resistor When the resistor voltage reaches the second preset voltage, the transistor is turned on, so that the negative crosstalk current generated at the moment of turn-off of the second switching transistor MOSFET-B passes through the first discharge capacitor. Release.

[0057] In this embodiment of the application, the first suppression circuit 10 includes a first clamping resistor. First discharge capacitor The first positive suppression branch 101 and the first negative suppression branch 102; the first and second terminals of the first positive suppression branch 101 and the first negative suppression branch 102 are respectively connected to the first clamping resistor. The two ends are connected, and the third end is connected to the first discharge capacitor. Connection, first bleed capacitor The first terminal is connected to the second terminal of the first switching transistor MOSFET-A, and the first discharge capacitor... The second end is connected to controller 3.

[0058] Taking the second switching transistor MOSFET-B as an example, which is turned on or off according to the control signal transmitted by the controller 3 outside the circuit breaker.

[0059] When the control signal is positive, the second switching transistor MOSFET-B turns on. At the instant of turn-on, the voltage of the second switching transistor MOSFET-B drops rapidly. This voltage change acts on the first switching transistor MOSFET-A, generating a positive crosstalk current flowing from the control electrode of the first switching transistor MOSFET-A. After flowing out of the control electrode of the first switching transistor MOSFET-A, the positive crosstalk current flows to the first suppression circuit 10, and then sequentially flows to the first clamping resistor within the first suppression circuit 10. The first positive suppression branch 101 and the first discharge capacitor Forward crosstalk current is at the first clamping resistor. A voltage drop will occur across the two terminals. When the voltage drop reaches the first preset voltage V1, the first forward suppression branch 101 is turned on, and the forward crosstalk current flows through the first forward suppression branch 101 to the first discharge capacitor. To release the wastewater.

[0060] When the control signal is negative, the second switching transistor MOSFET-B is turned off. At the instant of turn-off, the voltage of the second switching transistor MOSFET-B rises rapidly. This voltage change acts on the first switching transistor MOSFET-A, generating a negative crosstalk current flowing out of the control electrode of the first switching transistor MOSFET-A. After flowing out of the control electrode of the first switching transistor MOSFET-A, the negative crosstalk current flows to the first suppression circuit 10, and then sequentially flows to the first clamping resistor in the first suppression circuit 10. The first negative suppression branch 102 and the first discharge capacitor Negative crosstalk current is at the first clamping resistor. A voltage drop will occur across the two terminals. When the voltage drop reaches the second preset voltage V2, the first negative suppression branch 102 is turned on, and the negative crosstalk current flows through the first negative suppression branch 102 to the first discharge capacitor. To release the wastewater.

[0061] In the above embodiment, the first suppression circuit 10 is connected to the first clamping resistor. The voltage across the terminals determines whether the first positive suppression branch 101 and the first negative suppression branch 102 are conducting. When positive crosstalk occurs momentarily during the conduction of the second switch, if the first clamping resistor... When the voltage across the terminals is greater than the first preset voltage V1, the first forward suppression branch 101 is turned on, guiding the forward crosstalk current to the first discharge capacitor. Discharge is performed; when negative crosstalk occurs momentarily during the turn-off of the second switch, if the first clamping resistor... When the voltage across the terminals is greater than the second preset voltage V2, the first negative suppression branch 102 is turned on, guiding the negative crosstalk current to the first discharge capacitor. Discharge is performed. The first suppression circuit 10 achieves bidirectional suppression of positive and negative crosstalk currents, effectively preventing the first switching transistor from being mis-turned due to positive crosstalk, while absorbing negative crosstalk spikes and improving the reliability of the drive circuit.

[0062] According to some embodiments of this application, refer to Figure 3 The first positive suppression branch 101 includes a first transistor. and the first bleeder resistor First transistor The base of the first transistor is connected to controller 3. collector and first discharge capacitor The first terminal is connected to the first transistor. The emitter and the first clamping resistor The second terminal is connected; the first bleed resistor. The first terminal and the first transistor The emitter connection, the first bleeder resistor The second terminal and the first transistor The collector connection.

[0063] In this embodiment of the application, the first forward suppression branch 101 includes a first transistor. and the first bleeder resistor First transistor The base of the first transistor is connected to controller 3. A first discharge resistor is connected in parallel between the emitter and collector. In addition, the first transistor It can be a PNP type transistor.

[0064] When the control signal is positive, the second switching transistor MOSFET-B turns on, and at the instant of its turn-on, a positive crosstalk current is generated on the first switching transistor MOSFET-A. After flowing out from the control electrode of the first switching transistor MOSFET-A, the positive crosstalk current flows to the first suppression circuit 10, where it passes through the first clamping resistor. In the first clamping resistor A voltage drop is generated across the two terminals. When this voltage drop does not reach the first transistor in the first positive suppression branch 101... When the first preset voltage V1 is applied, the first transistor... When in the off state, the forward crosstalk current mainly passes through the first transistor. The first bleeder resistor in parallel Flow to the first discharge capacitor This achieves initial discharge; when the voltage drop reaches the first transistor... When the first preset voltage V1 is applied, the first transistor... When the transistor is turned on, a forward crosstalk current flows through the first transistor. Flow to the first discharge capacitor This achieves complete discharge. It should be noted that the first transistor... The first preset voltage V1 for conduction is determined based on the material properties: when a silicon transistor is used, the first preset voltage V1 is approximately 0.7V; when a germanium transistor is used, the first preset voltage V1 is approximately 0.4V.

[0065] In the above embodiment, the first positive suppression branch 101 adopts a first transistor. With the first bleed resistor The parallel structure, through the first clamping resistor The voltage drop across the two terminals controls the conduction state of the transistor. When the voltage drops below that of the first transistor... When the first preset voltage V1 is turned on, initial discharge is achieved, avoiding the problem of no response due to the transistor's turn-on voltage not being reached; when the voltage drop reaches the first transistor... After the first preset voltage V1 is turned on, the first transistor... It provides a low-impedance main discharge path, enabling rapid and complete discharge of crosstalk current, thereby improving the positive crosstalk suppression effect and circuit reliability.

[0066] According to some embodiments of this application, refer to Figure 4 The first negative suppression branch 102 includes a second transistor. First diode Second bleed resistor Second transistor The base of the second transistor is connected to controller 3. collector and first discharge capacitor The first end is connected to the second transistor. The emitter and the first diode Anode connection; first diode cathode and first clamping resistor The second terminal is connected; the second bleeder resistor. The first terminal and the second transistor The emitter connection, the second bleeder resistor The second terminal and the second transistor The collector connection.

[0067] In this embodiment, the first negative suppression branch 102 includes a second transistor. First diode Second bleed resistor Second transistor The base of the second transistor is connected to controller 3. The emitter is connected in series with the first diode. Second transistor A second bleeder resistor is connected in parallel between the emitter and collector. In addition, the second transistor It can be an NPN transistor.

[0068] When the control signal is negative, the second switching transistor MOSFET-B is turned off, and a negative crosstalk current is generated on the first switching transistor MOSFET-A at the instant of its turn-off. After flowing out from the control electrode of the first switching transistor, the negative crosstalk current flows to the first suppression circuit 10, where it flows through the first clamping resistor. In the first clamping resistor A voltage drop is generated across the two terminals. When this voltage drop does not reach the second transistor in the first negative suppression branch 102... and the first diode When the second preset voltage V2 is applied in series, the second transistor... When in the off state, the negative crosstalk current mainly passes through the second transistor. The second bleeder resistor in parallel Flow to the first discharge capacitor This achieves initial discharge; when the voltage drop reaches the second transistor... and the first diode When the second preset voltage V2 is applied in series, the second transistor... When the transistor is turned on, negative crosstalk current flows through the second transistor. Flow to the first discharge capacitor This achieves complete discharge. It should be noted that the second preset voltage V2 is the voltage of the second transistor. and the first diode The sum of the conduction voltages, the second transistor The forward voltage can be determined based on its material properties (approximately 0.7V for silicon diodes and approximately 0.4V for germanium diodes), the first diode. The forward voltage depends on its type (approximately 0.4V for a Schottky diode and approximately 0.7V for a standard silicon diode).

[0069] In the above embodiment, the first negative suppression branch 102 is connected to the first clamping resistor. Detect the voltage drop caused by negative crosstalk current and set it in relation to the second transistor. The second bleeder resistor in parallel When the voltage drop does not reach the second transistor With the first diode When the series connection is turned on by the second preset voltage V2, the second bleeder resistor... Provides an initial discharge path; when the voltage drop reaches the second preset voltage V2 for series conduction, the second transistor... The circuit is turned on, providing a low-impedance main discharge path and quickly guiding the negative crosstalk current to the first discharge capacitor. This graded discharge mechanism effectively suppresses negative crosstalk spikes and improves the reliability of the drive circuit under negative crosstalk conditions.

[0070] Corresponding to the first suppression circuit 10, this embodiment of the application also provides a second suppression circuit 20, as shown below. Figure 5 This is used to suppress crosstalk generated during the turn-on and turn-off of the first switching transistor MOSFET-A. Specifically:

[0071] The second suppression circuit 20 includes a second clamping resistor. Second discharge capacitor Second positive suppression branch 201 and second negative suppression branch 202; second clamping resistor The first terminal is connected to the controller 3, and the second terminal is connected to the control electrode of the first switching transistor MOSFET-A; the first and second terminals of the second positive suppression branch 201 and the second negative suppression branch 202 are respectively connected to the second clamping resistor. The two ends are connected, and the third end is connected to the second discharge capacitor. Connection. The first terminal of the second negative suppression branch 202 is connected to the second clamping resistor. The first terminal is connected, and the second terminal of the second negative suppression branch 202 is connected to the second clamping resistor. The second terminal is connected, and the third terminal of the second negative suppression branch 202 is connected to the second discharge capacitor. The first terminal is connected; the second positive suppression branch 201 is used for the second clamping resistor. When the resistor voltage reaches the first preset voltage V1, the transistor is turned on, so that the positive crosstalk current generated at the moment of turn-on of the first switching transistor MOSFET-A passes through the second discharge capacitor. Discharge; Second negative suppression branch 202, used for the second clamping resistor When the resistor voltage reaches the second preset voltage V2, it is turned on, so that the negative crosstalk current generated by the first switching transistor MOSFET-A at the moment of turn-off passes through the second discharge capacitor. Discharge. The second positive suppression branch 201 includes the third transistor. Third bleeder resistor Third transistor The base of the third transistor is connected to controller 3, and the collector of the third transistor is connected to the second discharge capacitor. The first end is connected to the third transistor. emitter and second clamping resistor The second terminal is connected; the third bleeder resistor. The first terminal and the third transistor emitter connection, third bleeder resistor The second terminal and the third transistor The collector connection. The second negative suppression branch 202 includes a fourth transistor. Second diode and the fourth bleeder resistor Fourth transistor The base of the fourth transistor is connected to controller 3. collector and second discharge capacitor The first end is connected to the fourth transistor. The emitter and the second diode Anode connection; second diode cathode and second clamping resistor The second terminal is connected; the fourth bleed resistor. The first terminal and the fourth transistor The emitter connection, the fourth bleeder resistor The second terminal and the fourth transistor The collector connection.

[0072] When the first switching transistor MOSFET-A is turned on, a positive crosstalk current is generated on the second switching transistor MOSFET-B. The second positive suppression branch 201, based on the second clamping resistor... The voltage drop across the terminals discharges the positive crosstalk current (the process is the same as the first positive suppression branch 101); when the first switching transistor MOSFET-A is turned off, a negative crosstalk current is generated on the second switching transistor MOSFET-B, and the second negative suppression branch 202 discharges the positive crosstalk current according to the second clamping resistor. The voltage drop across the two ends discharges the negative crosstalk current (the process is the same as that of the first negative suppression branch 102). The specific working process and beneficial effects of the second suppression circuit 20 are the same as those of the first suppression circuit 10, and will not be elaborated here.

[0073] According to some embodiments of this application, an electronic device is provided, with reference to... Figure 6 The electronic device includes a controller 3 and the aforementioned circuit breaker 1; the circuit breaker 1 includes a first switching transistor MOSFET-A, a second switching transistor MOSFET-B, and a drive circuit 2; the first switching transistor MOSFET-A and the second switching transistor MOSFET-B are used to receive control signals transmitted by the controller 3 through the drive circuit 2, and to connect or disconnect the power supply and the electrical equipment according to the control signals; the drive circuit 2 is used to suppress the crosstalk current generated when the first switching transistor MOSFET-A is turned on or off, and to suppress the crosstalk current generated when the second switching transistor MOSFET-B is turned on or off.

[0074] In this embodiment, a SiC MOSFET is used as the switching transistor of circuit breaker 1. The SiC MOSFET contains parasitic capacitances Cgs, Cds, Cgd, parasitic inductance Ls, and parasitic resistance Rg. The control terminal of MOSFET-A is connected to the first suppression circuit 10 via parasitic resistance Rg-1. The first terminal of MOSFET-A is connected to the power supply. The first and second terminals of Cgs-1 are connected to the control terminal and the second terminal of MOSFET-A, respectively. The first and second terminals of Cds-1 are connected to the first and second terminals of the first switching transistor MOSFET-A, respectively. The first and second terminals of Cgd-1 are connected to the control terminal and the first terminal of MOSFET-A, respectively. The first terminal of Ls-1 is connected to the second terminal of the first switching transistor MOSFET-A, and the second terminal of Ls-1 is connected to the second switching transistor. The first terminal of MOSFET-B is connected, and the control terminal of MOSFET-B is connected to the second suppression circuit 20 through parasitic resistor Rg-2. The first and second terminals of Cgs-2 are connected to the control and second terminals of MOSFET-B, respectively. The first and second terminals of Cds-2 are connected to the first and second terminals of the second switching transistor MOSFET-B, respectively. The first and second terminals of Cgd-2 are connected to the control and first terminals of MOSFET-B, respectively. The first terminal of Ls-2 is connected to the second terminal of the second switching transistor MOSFET-B, and the second terminal of Ls-2 is connected to the electrical equipment. The control signal V generated by the external controller of the circuit breaker... A The control signal V is transmitted to the control electrode of MOSFET-A and generated by the controller. B Transmitted to the control electrode of MOSFET-B.

[0075] In this embodiment, when the controller 3 detects that the connection between the power supply and the electrical equipment needs to be turned on or off, it outputs a corresponding control signal to the circuit breaker 1. The first switching transistor MOSFET-A and the second switching transistor MOSFET-B in the circuit breaker 1 perform the turn-on and turn-off operations according to the control signal. At the moment when MOSFET-A and MOSFET-B are turned on and off, crosstalk currents generated due to the influence of parasitic capacitance are suppressed by the drive circuit 2 to suppress the positive and negative crosstalk currents generated during the turn-on and turn-off transients.

[0076] In this application, to ensure the effective operation of the drive circuit 2 in the electronic device interrupt circuit 1, the parameters of the drive circuit 2 need to be designed. Taking the first suppression circuit 10 as an example, when MOSFET-B is turned on, a forward crosstalk current will be generated in MOSFET-A. To ensure that the first suppression circuit 10 can fully suppress the forward crosstalk current, it is necessary to ensure that the first transistor in the first forward suppression branch 101... On, meaning ensuring that current flows through the first clamping resistor. The voltage drop is greater than that of the first transistor. When MOSFET-B is turned off, a negative crosstalk current is generated in MOSFET-A due to the on-voltage V1. To ensure that the first suppression circuit 10 can fully suppress the negative crosstalk current, it is necessary to ensure that the second transistor in the first negative suppression branch 102 is in good condition. and the first diode On, meaning ensuring that current flows through the first clamping resistor. The voltage drop is greater than that of the first transistor. and the first diode If the series-connected on-state voltage V2 is then the first clamping resistor The following conditions must be met:

[0077] ,

[0078] In the formula, For the flow through the first clamping resistor The maximum current. Similarly, the second clamping resistor in the second suppression circuit 20 can be obtained. The conditions that need to be met.

[0079] At the same time, in order to ensure the first transistor When conducting, the first bleeder resistor The power consumed is reduced, and the first bleeder resistor The value range can be determined based on the first clamping resistor. Configure settings:

[0080] ,

[0081] In the formula, I is the forward crosstalk current, and P is... To reduce power loss, in order to ensure Discharge speed and reduced power loss, The value should be as small as possible to minimize the impact of increased resistance. Similarly, the value range of the other three bleeder resistors in circuit breaker 1 can be obtained.

[0082] In addition, to ensure the crosstalk suppression effect of the drive circuit 2, taking the first suppression circuit 10 and the first switching transistor MOSFET-A as an example, the following voltage conditions need to be met:

[0083] ,

[0084] In the formula, This represents the maximum negative voltage of the first switching transistor, MOSFET-A. The threshold voltage of the first switching transistor MOSFET-A First bleed resistor voltage, V C It can be represented as:

[0085] ,

[0086] In the formula, This is the power supply voltage. and The parasitic capacitance of MOSFET-A This is the first clamping resistor. Let be the first discharge capacitor, and k be the switching rate of the drain-source voltage of MOSFET-A. Similarly, the voltage conditions that the second suppression circuit 20 and the second switching transistor MOSFET-B need to satisfy can be obtained.

[0087] In the above embodiments, the electronic device includes a first switching transistor MOSFET-A, a second switching transistor MOSFET-B, and a driving circuit 2. The electronic device can connect or disconnect the power supply and the electrical equipment through the switching transistors. By reasonably setting the parameters in the driving circuit 2 and using the driving circuit 2 to suppress the crosstalk current generated during the switching transistors' turn-on and turn-off, it can effectively avoid the switching transistors from being mis-turned on due to crosstalk, ensure the safe and stable operation of the electrical equipment, improve the reliability of the entire system, and can be widely used in various systems that require short-circuit protection.

[0088] According to some embodiments of this application, such as Figure 7 As shown, a method for driving a circuit breaker is provided. This method is described using the driving circuit 2 of the above embodiment as an example. The method may include the following steps:

[0089] S701 receives control signals transmitted from an external controller to the drive circuit.

[0090] The controller 3 can generate a corresponding control signal according to the working state of the above-mentioned electronic device. The control signal is transmitted to the first switching transistor MOSFET-A or the second switching transistor MOSFET-B to indicate the on and off states of the first switching transistor MOSFET-A and the second switching transistor MOSFET-B.

[0091] For example, the controller 3 generates corresponding control signals based on the operating status of the electronic device, such as normal on / off commands or fault protection commands. When the electronic device needs normal power supply, the controller outputs a positive voltage control signal to turn on the first and second switching transistors; when a fault is detected (such as a short circuit or overcurrent), the controller outputs a negative voltage control signal to turn off the two switching transistors and cut off the fault current.

[0092] S702, according to the control signal, turns on the first and second switching transistors in the circuit breaker to conduct the connection between the electrical equipment and the power supply.

[0093] For example, when the control signal is positive, the control signal is transmitted to the first switching transistor MOSFET-A and the second switching transistor MOSFET-B, causing both transistors to conduct simultaneously. At this time, a path is formed between the power supply 4 and the electrical device 5, and the current flows to the electrical device through the first switching transistor MOSFET-A and the second switching transistor MOSFET-B, thus achieving normal power supply.

[0094] S703 disconnects the first and second switching transistors in the circuit breaker according to the control signal to cut off the connection between the electrical equipment and the power supply.

[0095] For example, when the control signal is negative, the control signal is transmitted to the first switching transistor MOSFET-A and the second switching transistor MOSFET-B, causing both switching transistors to turn off simultaneously. At this time, the connection between the power supply 4 and the electrical device 5 is disconnected, and the load current is blocked.

[0096] S704 suppresses crosstalk current generated during turn-on and turn-off.

[0097] For example, during the transient process of a switching transistor being turned on or off, its voltage changes rapidly and acts on the parasitic capacitance Cgd of another switching transistor, generating crosstalk current on the parasitic capacitance. In this embodiment, the crosstalk current on the two switching transistors is suppressed by a first suppression circuit 10 and a second suppression circuit 20 respectively: when the switching transient of the second switching transistor MOSFET-B affects the first switching transistor MOSFET-A, it is suppressed by the first suppression circuit 10; when the switching transient of the first switching transistor MOSFET-A affects the second switching transistor MOSFET-B, it is suppressed by the second suppression circuit 20.

[0098] In the above embodiments, by receiving control signals and executing the turn-on and turn-off of the first switching transistor MOSFET-A and the second switching transistor MOSFET-B according to the control signals, the positive and negative crosstalk currents generated during switching transients are suppressed by the drive circuit. This method can effectively avoid the switching transistors from being mis-turned on due to crosstalk and suppress negative voltage spikes, thereby improving the operational reliability of the circuit breaker.

[0099] According to some embodiments of this application, detailed implementation methods for suppressing crosstalk currents generated during turn-on and turn-off are explained and described, such as... Figure 8 As shown, as an optional implementation, the above-described S704 includes:

[0100] S801 discharges crosstalk current generated during the turn-on and turn-off moments of the second switch transistor through the first suppression circuit in the drive circuit.

[0101] S802 discharges crosstalk current generated during the turn-on and turn-off moments of the first switching transistor through the second suppression circuit in the drive circuit.

[0102] In this application, taking the transmission of the control signal from controller 3 to the second switching transistor MOSFET-B for its turn-on and turn-off as an example, when the control signal V... B When the voltage is positive, the second switching transistor MOSFET-B is turned on; when the control signal V... B When the voltage is negative, the second switching transistor MOSFET-B is turned off.

[0103] At the moment the second switching transistor MOSFET-B is turned on, a positive crosstalk current will be generated on the first switching transistor MOSFET-A; the positive crosstalk current flows through the first clamping resistor of the first suppression circuit 10. and in the first clamping resistor A voltage drop is generated across the two ends; if the voltage drop does not reach the first preset voltage V1 of the first forward suppression branch 101 in the first suppression circuit 10, then the forward crosstalk current flows through the first transistor in the first forward suppression branch 101. The first bleeder resistor in parallel Flow to the first discharge capacitor This achieves initial discharge; if the voltage drop reaches the first preset conduction voltage V1 of the first positive suppression branch 101, then the first transistor... When the transistor is turned on, the forward crosstalk current flows through the first transistor. Flow to the first discharge capacitor This enables rapid discharge.

[0104] When the second switching transistor MOSFET-B is turned off, a negative crosstalk current is generated on the first switching transistor MOSFET-A; the negative crosstalk current flows through the first clamping resistor. and in the first clamping resistor A voltage drop is generated across the two ends; if the voltage drop does not reach the second transistor in the first negative suppression branch 102 and the first diode When the series conduction of the second preset voltage V2 is achieved, the negative crosstalk current flows through the second transistor in the first negative suppression branch 102. The second bleeder resistor in parallel Flow to the first discharge capacitor This achieves initial discharge; if the voltage drop reaches the second preset voltage V2 of the first negative suppression branch 102, then the second transistor... When the transistor is turned on, negative crosstalk current flows through the second transistor. Flow to the first discharge capacitor This enables rapid discharge.

[0105] It should be noted that the first preset voltage V1 for the first positive suppression branch 101 to conduct is different from the second preset voltage V2 for the first negative suppression branch 102 to conduct. The first preset voltage V1 is the voltage of the first transistor. The conduction voltage of the second transistor, while the second preset voltage V2 is the conduction voltage of the second transistor. and the first diode Series-connected forward voltage.

[0106] In this application, the second suppression circuit 20 uses the same method to discharge the positive and negative crosstalk currents generated on the second switching transistor during the instant the first switching transistor is turned on and off.

[0107] In the above embodiments, the crosstalk current generated by the first suppression circuit 10 and the second suppression circuit 20 at the moment of conduction and turn-off of the first and second switching transistors is discharged respectively, thereby realizing adaptive bidirectional suppression of positive and negative crosstalk and improving the reliability of the circuit.

[0108] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0109] The embodiments described above merely illustrate several implementation methods of this application to facilitate a detailed understanding of the technical solutions of this application, but should not be construed as limiting the scope of protection of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. It should be understood that technical solutions obtained by those skilled in the art based on the technical solutions provided in this application through logical analysis, reasoning, or limited experimentation are all within the scope of protection of the appended claims. Therefore, the scope of protection of this patent application should be determined by the content of the appended claims, and the specification and drawings can be used to interpret the content of the claims.

Claims

1. A circuit breaker, characterized in that, The circuit breaker includes a first switching transistor, a second switching transistor, and a drive circuit; the first terminal of the first switching transistor is connected to the power supply, the second terminal of the first switching transistor is connected to the first terminal of the second switching transistor, and the second terminal of the second switching transistor is connected to the electrical equipment. The driving circuit includes a first suppression circuit and a second suppression circuit; the first suppression circuit is connected to the control electrode of the first switching transistor and the controller outside the circuit breaker, respectively; the second suppression circuit is connected to the control electrode of the second switching transistor and the controller, respectively. The first suppression circuit is used to transmit the control signal of the controller to the second switching transistor and suppress the crosstalk current generated during the turn-on and turn-off of the second switching transistor. The second suppression circuit is used to transmit the control signal of the controller to the first switching transistor and suppress the crosstalk current generated during the turn-on and turn-off of the first switching transistor.

2. The circuit breaker according to claim 1, characterized in that, The first suppression circuit includes a first clamping resistor, a first bleeder capacitor, a first positive suppression branch, and a first negative suppression branch; The first end of the first clamping resistor is connected to the controller, and the second end of the first clamping resistor is connected to the control electrode of the first switching transistor. The first end of the first positive suppression branch is connected to the first end of the first clamping resistor, the second end of the first positive suppression branch is connected to the second end of the first clamping resistor, and the third end of the first positive suppression branch is connected to the first end of the first discharge capacitor. The first end of the first negative suppression branch is connected to the first end of the first clamping resistor, the second end of the first negative suppression branch is connected to the second end of the first clamping resistor, and the third end of the first negative suppression branch is connected to the first end of the first discharge capacitor. The first positive suppression branch is used to turn on when the voltage of the first clamping resistor reaches a first preset voltage, so that the positive crosstalk current generated by the second switch at the moment of turn-on is discharged through the first discharge capacitor. The first negative suppression branch is turned on when the voltage of the first clamping resistor reaches the second preset voltage, so that the negative crosstalk current generated by the second switch at the moment of turn-off is discharged through the first discharge capacitor.

3. The circuit breaker according to claim 2, characterized in that, The first positive suppression branch includes a first transistor and a first bleeder resistor; The base of the first transistor is connected to the controller, the collector of the first transistor is connected to the first end of the first discharge capacitor, and the emitter of the first transistor is connected to the second end of the first clamping resistor. The first end of the first bleeder resistor is connected to the emitter of the first transistor, and the second end of the first bleeder resistor is connected to the collector of the first transistor.

4. The circuit breaker according to claim 2, characterized in that, The first negative suppression branch includes a second transistor, a first diode, and a second bleeder resistor; The base of the second transistor is connected to the controller, the collector of the second transistor is connected to the first end of the first discharge capacitor, and the emitter of the second transistor is connected to the anode of the first diode. The cathode of the first diode is connected to the second end of the first clamping resistor; The first end of the second bleeder resistor is connected to the emitter of the second transistor, and the second end of the second bleeder resistor is connected to the collector of the second transistor.

5. The circuit breaker according to claim 1, characterized in that, The second suppression circuit includes a second clamping resistor, a second bleeder capacitor, a second positive suppression branch, and a second negative suppression branch; The first end of the second clamping resistor is connected to the controller, and the second end of the second clamping resistor is connected to the control electrode of the second switching transistor. The first end of the second positive suppression branch is connected to the first end of the second clamping resistor, the second end of the second positive suppression branch is connected to the second end of the second clamping resistor, and the third end of the second positive suppression branch is connected to the first end of the second discharge capacitor. The first end of the second negative suppression branch is connected to the first end of the second clamping resistor, the second end of the second negative suppression branch is connected to the second end of the second clamping resistor, and the third end of the second negative suppression branch is connected to the first end of the second discharge capacitor. The second positive suppression branch is used to turn on when the voltage of the second clamping resistor reaches the first preset voltage, so that the positive crosstalk current generated by the first switching transistor at the moment of turn-on is discharged through the second discharge capacitor. The second negative suppression branch is used to conduct when the voltage of the second clamping resistor reaches the second preset voltage, so that the negative crosstalk current generated by the first switching transistor at the moment of turn-off is discharged through the second discharge capacitor.

6. The circuit breaker according to claim 5, characterized in that, The second positive suppression branch includes a third transistor and a third bleeder resistor; The base of the third transistor is connected to the controller, the collector of the third transistor is connected to the first end of the second discharge capacitor, and the emitter of the third transistor is connected to the second end of the second clamping resistor. The first end of the third bleeder resistor is connected to the emitter of the third transistor, and the second end of the third bleeder resistor is connected to the collector of the third transistor.

7. The circuit breaker according to claim 5, characterized in that, The second negative suppression branch includes a fourth transistor, a second diode, and a fourth bleeder resistor; The base of the fourth transistor is connected to the controller, the collector of the fourth transistor is connected to the first end of the second discharge capacitor, and the emitter of the fourth transistor is connected to the anode of the second diode. The cathode of the second diode is connected to the second terminal of the second clamping resistor; The first end of the fourth bleeder resistor is connected to the emitter of the fourth transistor, and the second end of the fourth bleeder resistor is connected to the collector of the fourth transistor.

8. An electronic device, characterized in that, The electronic device includes a controller and a circuit breaker as described in any one of claims 1-7; the circuit breaker includes a first switching transistor, a second switching transistor, and a drive circuit; The first switching transistor and the second switching transistor are used to receive control signals transmitted by the controller through the drive circuit, and to connect the power supply and the electrical equipment or disconnect the power supply and the electrical equipment according to the control signals. The driving circuit is used to suppress the crosstalk current generated when the first switch is turned on and turned off, and to suppress the crosstalk current generated when the second switch is turned on and turned off.

9. A method for driving a circuit breaker, characterized in that, Applied to the circuit breaker as described in any one of claims 1-7, the method comprises: Receive control signals transmitted from the controller outside the drive circuit; The control signal is used to turn on the first and second switching transistors in the circuit breaker to conduct the connection between the electrical equipment and the power supply. The first and second switching transistors in the circuit breaker are disconnected according to the control signal to cut off the connection between the electrical equipment and the power supply. Suppress crosstalk currents generated during turn-on and turn-off.

10. The method according to claim 9, characterized in that, The suppression of crosstalk current generated at the moment of turn-on and turn-off includes: The crosstalk current generated during the turn-on and turn-off moments of the second switch is discharged through the first suppression circuit in the driving circuit. The crosstalk current generated during the turn-on and turn-off moments of the first switch is discharged through the second suppression circuit in the driving circuit.

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