Solid state circuit breaker

Abstract

The utility model relates to a kind of solid-state circuit breaker, comprising: solid-state switch, the solid-state switch is configured to be connected in series in main circuit;Control circuit, the control circuit is configured to generate control signal, to control solid-state switch;At least one functional circuit, each functional circuit is connected to control circuit, and including filter unit and function port, wherein, filter unit is arranged between function port and the internal component of functional circuit, wherein, functional circuit is separated from control circuit.The proposed solid-state circuit breaker can greatly reduce the volume size and cost of solid-state circuit breaker, and has good electromagnetic compatibility, effectively improves the reliability and stability in complex electromagnetic environment.

Description

Technical Field

[0001] This utility model relates generally to the field of electrical equipment technology, and more specifically, to a solid-state circuit breaker. Background Technology

[0002] Circuit breakers are commonly used safety protection devices in power distribution systems, primarily used to protect circuits from damage caused by faults such as overcurrent, overload, or short circuits. Solid-state circuit breakers are a new type of circuit breaker that uses power electronic devices (such as IGBTs and MOSFETs) to control circuit switching and provide fault protection. Compared to traditional mechanical circuit breakers, solid-state circuit breakers have significant advantages such as fast response speed (microseconds or nanoseconds), no electric arc, and long lifespan. The core function of a solid-state circuit breaker relies on the coordinated operation of the main circuit (high-voltage circuit) and the control circuit (low-voltage circuit). The main circuit connects to the main circuit including the power grid and the load, responsible for switching large currents. The control circuit includes drive, measurement, and communication modules, responsible for logic judgment, signal transmission, and action triggering.

[0003] Electromagnetic compatibility (EMC) is a critical consideration in solid-state circuit breaker design, encompassing emission suppression of electromagnetic interference (EMI) and protection against electromagnetic immunity (EMS). EMI is divided into conducted interference (propagating through power cables) and radiated interference (propagating through space), while EMS involves suppressing external interference from affecting internal control circuitry. The EMC performance of solid-state circuit breakers directly affects their reliability and stability in complex electromagnetic environments. Utility Model Content

[0004] This utility model proposes a circuit breaker, characterized in that the solid-state circuit breaker includes: a solid-state switch configured to be connected in series in a main circuit; a control circuit configured to generate a control signal to control the solid-state switch; and at least one functional circuit, each functional circuit being connected to the control circuit and including a filtering unit and a functional port, wherein the filtering unit is arranged between the functional port and internal components of the functional circuit, and wherein the functional circuit is separate from the control circuit.

[0005] According to an embodiment of the present invention, the solid-state circuit breaker further includes an isolation circuit, which is disposed between each functional circuit and the control circuit.

[0006] According to an embodiment of the present invention, the isolation circuit includes at least one of an isolation operational amplifier, a digital isolator, and an isolation power supply module.

[0007] According to an embodiment of the present invention, a ground plane partition structure is provided between each functional circuit and the control circuit, which physically isolates each functional circuit from the control circuit.

[0008] According to an embodiment of the present invention, a ground plane segmentation structure is disposed on the ground plane of the control circuit board, each functional circuit and the control circuit are integrated on the control circuit board, and wherein the ground plane of the control circuit board includes a physically isolated functional ground area and a control ground area, the functional circuits refer to the functional ground area as the reference ground, and the control circuits refer to the control ground area as the reference ground.

[0009] According to an embodiment of the present invention, at least one functional circuit includes a measurement circuit, a functional port includes a measurement port, and the measurement circuit is configured to measure at least one of voltage, current, and temperature of the main circuit through the measurement port.

[0010] According to an embodiment of the present invention, at least one functional circuit includes a communication circuit, a functional port includes a communication port, and the communication circuit is configured to be connected to an external device via the communication port.

[0011] According to an embodiment of the present invention, at least one functional circuit includes a driving circuit, a functional port includes a driving port, and the driving circuit is configured to be connected to a solid-state switch through the driving port and configured to generate a driving signal based on a control signal generated by a control circuit and send the driving signal to the solid-state switch.

[0012] According to an embodiment of the present invention, the communication circuit is further configured to send the operating status and measurement data of the solid-state circuit breaker to an external device, wherein the operating status includes at least one of switch status, alarm signal, and fault information, and the measurement data includes at least one of voltage, current, and temperature of the main circuit.

[0013] According to an embodiment of this utility model, the external device includes at least one of a monitoring device, a statistical intelligent device, a superior control system, and a cloud platform.

[0014] According to an embodiment of the present invention, the solid-state switch is a metal-oxide-semiconductor field-effect transistor (MOSFET).

[0015] In this invention, the proposed solid-state circuit breaker can provide filtering units in each functional circuit that is independently set with the control circuit, thereby increasing the isolation between the ports of the solid-state circuit breaker. This helps to more effectively suppress electromagnetic interference that enters from external ports, significantly reduce the size and cost of the solid-state circuit breaker, and has good electromagnetic compatibility, effectively improving its reliability and stability in complex electromagnetic environments. Attached Figure Description

[0016] The above and other aspects, features, and advantages of specific embodiments of the present invention will become clearer from the following description taken in conjunction with the accompanying drawings, in which:

[0017] Figure 1 This is a schematic structural diagram showing a solid-state circuit breaker in the prior art;

[0018] Figure 2 This is a schematic structural diagram illustrating a solid-state circuit breaker according to an embodiment of the present invention;

[0019] Figure 3 This is a schematic structural diagram illustrating another implementation of the solid-state circuit breaker according to an embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram illustrating the external electromagnetic interference path in a solid-state circuit breaker according to an embodiment of the present invention. Detailed Implementation

[0021] Before proceeding with the detailed description below, it may be advantageous to define certain words and phrases used throughout this invention. The terms “comprising” and “including” and their derivatives mean, but are not limited to, any of the following. The term “controller” or “control unit” means any device, system, or part thereof that controls at least one operation. Such a controller may be implemented in hardware, or a combination of hardware and software and / or firmware. For example, a controller may include, for instance, an application-specific integrated circuit (ASIC), a general-purpose or special-purpose central processing unit (CPU), a digital signal processor (DSP), and programmable logic devices such as field-programmable gate arrays (FPGAs). A controller may be manufactured as a single printed circuit board (PCB) or distributed across several interconnected PCBs. A controller may include other processing circuitry; for example, a controller may include two processing circuits such as an FPGA and a CPU interconnected on a PCB. The functionality associated with any particular controller may be centralized or distributed, either local or remote. The phrase “at least one,” when used with a list of items, means that different combinations of one or more of the listed items may be used, and that only one item from the list may be required. For example, "at least one of A, B, and C" includes any one of the following combinations: A, B, C, A and B, A and C, B and C, A and B and C. Furthermore, in the description of this utility model, the terms "first," "second," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance or order. In embodiments of this disclosure, unless otherwise expressly stated, "connection" does not necessarily mean "direct connection" or "direct contact," but only requires electrical connection.

[0022] Definitions of other specific words and phrases are provided throughout this invention. Those skilled in the art will understand that, in many, if not most, cases, such definitions apply to the prior and future use of the words and phrases thus defined.

[0023] The various embodiments of the present invention described below with reference to the accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of the present invention in any way. Those skilled in the art will understand that the principles of the present invention can be implemented in any suitably arranged system or device. In some cases, the actions described in the present invention can be performed in different orders and still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require the specific order or sequential sequence shown to achieve the desired result. In certain embodiments, multitasking and parallel processing may be advantageous.

[0024] The text and accompanying drawings are provided by way of example only to aid in understanding the present invention. They should not be construed as limiting the scope of the appended claims in any way. Although certain embodiments and examples have been provided, it will be clear to those skilled in the art, based on the content of the present invention, that changes can be made to the illustrated embodiments and examples without departing from the scope of the present invention.

[0025] In actual operation, because the time for solid-state circuit breakers to perform closing or opening actions is very short, solid-state circuit breakers are usually in a closed or open state. Therefore, the EMI electromagnetic emission characteristics of solid-state circuit breakers are mainly determined by the characteristics of their electronic control circuits. That is, the external electromagnetic interference of solid-state circuit breakers is mainly generated by their electronic control circuits.

[0026] In commonly used solid-state circuit breakers, conducted electromagnetic interference (EMI) is typically suppressed by configuring filter circuit units at the power cable input and output ports. However, such filter circuit units need to be compatible with the high current demands of the power lines, resulting in larger size and more complex structure, which in turn adversely affects the overall performance of the solid-state circuit breaker (e.g., size, cost, heat dissipation).

[0027] Furthermore, the control circuits of solid-state circuit breakers (e.g., including driver chips, sensors, MCUs, communication chips, etc.) operate at low voltage (e.g., 5-30V) and low current (e.g., milliampere level), making them highly sensitive to external electromagnetic interference (e.g., high-frequency noise, pulse interference, etc.). Although commonly used solid-state circuit breakers add filter circuit units at the ports, due to the high sensitivity of solid-state switches, this method is difficult to effectively improve anti-interference capabilities and cannot meet the reliability requirements of solid-state circuit breakers in complex electromagnetic environments.

[0028] Figure 1 This is a schematic structural diagram showing a solid-state circuit breaker in the prior art.

[0029] refer to Figure 1The solid-state circuit breaker 100 may include a solid-state switch 110 and a control circuit 120. The control circuit 120 may include a computing unit 121, a measurement unit 122, a drive unit 123, and a communication unit 124.

[0030] The computing unit 121 can generate control signals to control the solid-state switch. In some embodiments, the computing unit 121 can receive signals through the measurement unit 122, perform calculations based on the received signals, and generate control signals based on the calculation results. In some embodiments, the computing unit 121 can compare the measured values ​​with internally preset protection thresholds (e.g., overcurrent thresholds) based on the received signals to determine the current operating state (e.g., normal state, overload state, or short-circuit fault, etc.), and generate control commands and / or signals to execute protection based on the determination results. For example, in the normal state, the computing unit 121 can generate a "hold closed" command, and in the fault state, the computing unit 121 can generate a "quick open" command. In some embodiments, the computing unit 121 can be an MCU.

[0031] In some embodiments, the computing unit 121 can coordinate and manage the work of the measurement unit 122, the drive unit 123, and the communication unit 124, etc.

[0032] The measurement unit 122 may include a measurement port and measure signals in real time through the measurement port. In some embodiments, the measurement unit 122 may measure electrical parameters of the main circuit, such as voltage and current. In some embodiments, the measurement unit 122 may also measure status parameters, such as temperature.

[0033] The drive unit 123 can convert the "low-voltage command" from the computing unit 121 into a "high-voltage command" that can directly control the solid-state switch 110. In some embodiments, the drive unit 123 can send the command to the solid-state switch 110 through its internal drive port.

[0034] The communication unit 124 may include a communication port, through which it transmits the operating status and measurement data of the solid-state circuit breaker 100 to external devices, and receives instructions and / or data from external devices. In some embodiments, the operating status of the solid-state circuit breaker 100 may include the switching status, alarm signals, and fault information of the solid-state circuit breaker 100, and the measurement data may include the voltage and current of the main circuit. In some embodiments, the external devices may include monitoring equipment, statistical intelligent devices, upper-level control systems, and cloud platforms. In some embodiments, the communication unit 124 may support physical interfaces such as RS-485, Ethernet, and CAN, as well as communication protocols such as Modbus and IEC 61850.

[0035] Those skilled in the art will understand that the functional units such as the measurement unit 122, the drive unit 123, and the communication unit 124 described above are merely examples. Depending on the specific application, there may be other functional units, such as other data input units and data output units for both digital and analog data.

[0036] The solid-state switch 110 can be connected in series in the main circuit. The solid-state switch 110 can be connected to the main circuit through voltage and current input ports and voltage and current output ports. In some embodiments, the solid-state switch 110 can be a metal-oxide-semiconductor field-effect transistor (MOSFET).

[0037] like Figure 1 As shown by the thick dashed line, the electromagnetic interference generated by the control circuit 120 of the solid-state circuit breaker 100 can be conducted to the main circuit through the drive port and the solid-state switch 110, and then conducted along the power grid, thereby affecting other sensitive equipment on the same power grid and potentially causing them to malfunction.

[0038] like Figure 1 As shown by the thin dashed lines, external electromagnetic interference (e.g., high-frequency noise, pulse interference, etc.) can enter the solid-state circuit breaker 100 through external ports, potentially causing malfunctions in the internal control circuit 120 of the solid-state circuit breaker 100, and in extreme cases, causing unexpected abnormal operation of the solid-state circuit breaker 100. Figure 1 As shown, the external ports may include voltage / current input ports, voltage / current output ports, measurement ports, communication ports, etc. External electromagnetic interference can enter the solid-state circuit breaker 100 through any of the external ports, and may propagate along routes including but not limited to... Figure 1 The thin dashed lines in the diagram illustrate the conduction path. For example, external electromagnetic interference entering the solid-state circuit breaker 100 through the voltage and current input ports can be conducted along the path of solid-state switch 110, drive port, drive unit 123, computing unit 121, measurement unit 122, and measurement port; or along the path of solid-state switch 110, drive port, drive unit 123, computing unit 121, communication unit 124, and communication port. Those skilled in the art will understand that the above-described conduction paths of external electromagnetic interference are merely examples, and depending on the specific application scenario, other conduction paths of external electromagnetic interference may exist.

[0039] Figure 2 This is a schematic structural diagram illustrating a solid-state circuit breaker according to an embodiment of the present invention.

[0040] refer to Figure 2 The solid-state circuit breaker 200 may include a solid-state switch 210, a control circuit 220, and at least one functional circuit 230.

[0041] The solid-state switch 210 can be connected in series in the main circuit. The solid-state switch 210 can be connected to the main circuit via voltage / current input ports and voltage / current output ports. In some embodiments, the solid-state switch 210 can be a metal-oxide-semiconductor (MOSFET).

[0042] The control circuit 220 may include a computing unit 221. Figure 1 Similarly, computing unit 221 can generate control signals to control the solid-state switch. In some embodiments, computing unit 221 can receive signals, perform calculations based on the received signals, and generate control signals based on the calculation results.

[0043] At least one functional circuit 230 may be connected to the control circuit 220 and may include a filter unit 231 and a function port, wherein the filter unit 231 may be arranged between the function port and the internal components of the functional circuit 230. The functional circuit 230 may receive and transmit signals through the filter unit 231 disposed therein. The functional circuit 230 may refer to a series of interconnected electronic circuit modules that respectively implement the measurement, protection, communication, and other functions of the solid-state circuit breaker 200. In some embodiments, the functional circuit 230 may include a measurement circuit, a drive circuit, and a communication circuit, etc., but the present invention is not limited thereto. The internal components of the functional circuit 230 may refer to the circuit part inside the functional circuit that performs its core dedicated function. For example, when the functional circuit 230 is a measurement circuit, the internal components of the functional circuit 230 may include a sensor interface, a signal conditioning unit, etc., for receiving analog signals from external sensors and converting them into digital signals that can be processed. When the functional circuit 230 is a drive circuit, the internal components of the functional circuit 230 may include a power switch, a gate driver, etc., for receiving low-power signals from the control circuit and outputting high-power signals to drive the solid-state switch. When functional circuit 230 is a communication circuit, its internal components may include digital wired communication modules such as UART or CAN, or radio frequency wireless communication modules such as Bluetooth, for exchanging data with external devices. Those skilled in the art will understand that the above-described internal components are merely examples, and other internal components of the functional circuit may exist depending on the specific application.

[0044] By providing filter units 231 in each functional circuit 230 that is independently set with the control circuit 220, external electromagnetic interference transmitted from the power line or signal line can be attenuated, and electromagnetic interference generated by the solid-state circuit breaker 200 can be attenuated to prevent it from being conducted to the power grid or space through the wires. This effectively enhances the robustness of the solid-state circuit breaker 200 under external interference, making the solid-state circuit breaker 200 work more stably and reliably.

[0045] Functional circuit 230 can be separated from control circuit 220. Figure 1 Unlike the solid-state circuit breaker 100, the functional circuit 230 of the solid-state circuit breaker 200 is separated from the control circuit 220, forming port circuits with their own functions.

[0046] In some embodiments, the functional circuit 230 may be isolated from the control circuit 220 via an isolation circuit. The solid-state circuit breaker 200 may also include an isolation circuit disposed between the functional circuit 230 and the control circuit 220. In some embodiments, the isolation circuit may include at least one of an isolation operational amplifier, a digital isolator, and an isolation power supply module.

[0047] In some embodiments, a ground plane partition structure may be provided between the functional circuit 230 and the control circuit 220, which physically isolates the functional circuit 230 and the control circuit 220. In some embodiments, the functional circuit 230 and the control circuit 220 may be integrated on a control circuit board, and the ground plane partition structure may be provided on the ground layer of the control circuit board. The ground layer of the control circuit board has a ground plane partition structure, which includes a physically isolated functional ground area and a control ground area. The functional circuit 230 may use the functional ground area as a reference ground, and the control circuit 220 may use the control ground area as a reference ground.

[0048] In some embodiments, the ground plane partition structure between the functional circuit 230 and the control circuit 220 can be formed by physically partitioning the ground plane on the PCB. In the PCB design, the ground plane can be divided into multiple independent regions, such as functional regions and control regions, including measurement ground regions, drive ground regions, and communication ground regions, by drawing dividing lines, thereby achieving isolation between different functional circuits 230 (e.g., measurement circuits, drive circuits, and communication circuits) and between the functional circuit 230 and the control circuit 220, thus preventing noise current from being conducted between different regions. Furthermore, the various regions on the PCB's ground plane (e.g., measurement ground regions, drive ground regions, communication ground regions, and control ground regions) can be electrically connected at a single connection point using impedance elements. In some embodiments, the impedance element may include a 0-ohm resistor, a ferrite bead, etc.

[0049] In this embodiment of the invention, the solid-state circuit breaker 200 can provide a filter unit 231 in each functional circuit 230 that is independently set with respect to the control circuit 220, thereby increasing the isolation between the ports of the solid-state circuit breaker 200 and helping to more effectively suppress electromagnetic interference that enters from external ports.

[0050] Figure 3This is a schematic structural diagram illustrating another implementation of the solid-state circuit breaker according to an embodiment of the present invention.

[0051] refer to Figure 3 The solid-state circuit breaker 300 may include a solid-state switch 310, a control circuit 320, a measurement circuit 330, a drive circuit 340, and a communication circuit 350.

[0052] The solid-state switch 310 can be connected in series in the main circuit. The solid-state switch 310 can be connected to the main circuit via voltage / current input ports and voltage / current output ports. In some embodiments, the solid-state switch 310 can be a metal-oxide-semiconductor (MOSFET).

[0053] The control circuit 320 may include a computing unit 321. Figure 1 Similarly, computing unit 321 can generate control signals to control the solid-state switch. In some embodiments, computing unit 321 can receive signals through measurement circuit 330, perform calculations based on the received signals, and generate control signals based on the calculation results. In some embodiments, computing unit 321 can be an MCU.

[0054] The measurement circuit 330 can be connected to the control circuit 320 and may include a filter unit 331 and a measurement port. The measurement circuit 330 can be configured to measure the voltage and current of the main circuit. Figure 1 Similarly, the measurement unit 122 in the measurement circuit 330 can measure electrical parameters of the main circuit, such as voltage and current. In some embodiments, the measurement circuit 330 can also measure state parameters, such as temperature.

[0055] The drive circuit 340 can be connected to the control circuit 320 and may include a filter unit 341 and a drive port. The drive circuit 340 can be connected to the solid-state switch 310 via the drive port and is configured to generate a drive signal based on the control signal generated by the control circuit 320, and send the drive signal to the solid-state switch 320. Figure 1 Similarly, in the drive unit 123, the drive circuit 340 can convert the "weak current command" of the computing unit 321 into a "strong current command" that can directly control the solid-state switch 310.

[0056] The communication circuit 350 can be connected to the control circuit 320 and may include a filter unit 351 and a communication port. The communication circuit 350 can be configured to connect to an external device via the communication port. Figure 1Similarly, the communication circuit 350 can transmit the operating status and measurement data of the solid-state circuit breaker 300 to external devices and receive instructions and / or data from external devices via the communication port, through the communication unit 124. In some embodiments, the operating status of the solid-state circuit breaker 300 may include the switching status, alarm signals, and fault information of the solid-state circuit breaker 300, and the measurement data may include the voltage and current of the main circuit. In some embodiments, the external devices may include monitoring equipment, statistical intelligent devices, upper-level control systems, and cloud platforms. In some embodiments, the communication unit 124 may support physical interfaces such as RS-485, Ethernet, and CAN, as well as communication protocols such as Modbus and IEC 61850.

[0057] By providing filter units 331, 341, and 351 in the measurement circuit 330, drive circuit 340, and communication circuit 350, which are independently set up with the control circuit 320, external electromagnetic interference transmitted from the power line or signal line can be attenuated, and electromagnetic interference generated by the solid-state circuit breaker 300 can be attenuated, preventing it from being conducted to the power grid or space through the wires. This effectively enhances the robustness of the solid-state circuit breaker 300 under external interference, making the solid-state circuit breaker 300 work more stably and reliably.

[0058] In some embodiments, signal isolation between the measurement circuit 330, the drive circuit 340, and the communication circuit 350 and the control circuit 320 can be achieved through isolation circuits. The solid-state circuit breaker 300 may further include isolation circuits 361, 362, and 363 respectively disposed between the measurement circuit 330, the drive circuit 340, and the communication circuit 350 and the control circuit 320. Isolation circuits 361, 362, and 363 may include at least one of an isolation operational amplifier, a digital isolator, and an isolated power supply module.

[0059] In some embodiments, a ground plane partition structure may be provided between the measurement circuit 330, the drive circuit 340, and the communication circuit 350 and the control circuit 320. This ground plane partition structure physically isolates the functional electrical measurement circuit 330, the drive circuit 340, and the communication circuit 350 from the control circuit 320. In some embodiments, the measurement circuit 330, the drive circuit 340, and the communication circuit 350 and the control circuit 320 may be integrated on a control circuit board. The ground plane of the control circuit board has a ground plane partition structure, including a physically isolated functional ground area and a control ground area. The measurement circuit 330, the drive circuit 340, and the communication circuit 350 may use the measurement ground area, the drive ground area, and the communication ground area as reference grounds, respectively, and the control circuit 320 may use the control ground area as a reference ground.

[0060] Those skilled in the art will understand that the functional circuits described above, such as the measurement circuit 330, the drive circuit 340, and the communication circuit 350, are merely examples. Depending on the specific application, there may be other functional circuits, such as other data input circuits and data output circuits for both digital and analog data.

[0061] Figure 4 This is a schematic diagram illustrating the external electromagnetic interference path in a solid-state circuit breaker according to an embodiment of the present invention.

[0062] refer to Figure 4 In the solid-state circuit breaker 300, external electromagnetic interference can flow along the path of the first port of the solid-state circuit breaker 300, the first filter circuit, the internal components of the first functional circuit, the internal connection circuit, the internal components of the second functional circuit, the second filter circuit, and the second port.

[0063] The solid-state circuit breaker 300 may include a first port, a first functional circuit, an internal connection circuit, a second functional circuit, and a second port. Figure 3 Similarly, in the solid-state circuit breaker 300 shown, the first port and the second port can refer to any one of a voltage / current input port, a voltage / current output port, a measurement port, and a communication port. Exceptionally, the first port and the second port cannot simultaneously refer to a voltage / current input port and a voltage / current output port, respectively. The first functional circuit and the second functional circuit can refer to any one of a measurement circuit 330, a drive circuit 340, and a communication circuit 350. The first functional circuit and the second functional circuit can each include a first filter circuit and a second filter circuit. The first filter circuit and the second filter circuit can refer to a corresponding one of filter units 331, 341, and 351. Figure 4 In the diagram, although the first port and the first functional circuit, and the second port and the second functional circuit are shown as separate modules, in some cases, the first port may be included in the first functional circuit, and the second port may be included in the second functional circuit. For example, when the first port is a measurement port, the first functional circuit is a measurement circuit, and the first port may be included in the first functional circuit.

[0064] Internal connection circuitry can refer to circuitry connected between any two functional circuits. For example, the internal connection circuitry between measurement circuitry 330 and communication circuitry 350 may include isolation circuitry 361, a portion of control circuitry 320, and isolation circuitry 363. The internal connection circuitry between measurement circuitry 330 and drive circuitry 340 may include isolation circuitry 361, a portion of control circuitry 320, and isolation circuitry 362. The internal connection circuitry between drive circuitry 340 and communication circuitry 350 may include isolation circuitry 362, a portion of control circuitry 320, and isolation circuitry 363. Figure 4Although not shown, in some cases, a solid-state switch 310 may be included between the first port and the first functional circuit, and between the second port and the second functional circuit. For example, when the first port is a voltage or current input port, a solid-state switch 310 may be included between the first port and the first functional circuit.

[0065] When external electromagnetic interference enters from an external port, it can flow along the path of the first port of the solid-state circuit breaker 300, the first filter circuit, the internal components of the first functional circuit, the internal connection circuit, the internal components of the second functional circuit, the second filter circuit, and the second port. For example, when the first port is a measurement port and the second port is a voltage and current input port, the external electromagnetic interference can flow along the path of the measurement port, the filter unit 331, the internal components of the measurement circuit 330, the isolation circuit 361, a portion of the control circuit 320, the isolation circuit 362, the internal components of the drive circuit 340, the filter unit 341, the drive port, the solid-state switch 310, and the voltage and current input port.

[0066] Through the isolation circuits 361, 362, and 363 in the solid-state circuit breaker 300, as well as the ground plane partition structure between the measurement circuit 330, the drive circuit 340, the communication circuit 350, and the control circuit 320, the internal connection circuit of the solid-state circuit breaker 300 can have high impedance compared to the internal connection circuit of solid-state circuit breakers in the prior art.

[0067] The solid-state circuit breaker 300 of this invention effectively increases the impedance between its ports by dividing the functional circuits, thereby improving the isolation between the ports and helping to more effectively suppress electromagnetic interference from external ports. While significantly reducing the size and cost of the solid-state circuit breaker, it also exhibits good electromagnetic compatibility, effectively improving its reliability and stability in complex electromagnetic environments.

[0068] Although the present invention has been described with reference to exemplary embodiments, various changes and modifications may be suggested to those skilled in the art. The present invention is intended to cover such changes and modifications that fall within the scope of the appended claims.

[0069] Any description in this invention should not be construed as implying that any particular element, step, or function is an essential element that must be included within the scope of the claims. The scope of the patent subject matter is defined only by the claims.

Claims

1. A solid-state circuit breaker, characterized in that, The solid-state circuit breaker includes: A solid-state switch, wherein the solid-state switch is configured to be connected in series in the main circuit; A control circuit configured to generate a control signal to control a solid-state switch; At least one functional circuit, each of which is connected to a control circuit, and includes a filtering unit and a functional port, wherein the filtering unit is arranged between the functional port and internal components of the functional circuit. In this design, the functional circuits and the control circuits are separated.

2. The solid-state circuit breaker according to claim 1, characterized in that, The solid-state circuit breaker also includes an isolation circuit that is disposed between each of the functional circuits and the control circuit.

3. The solid-state circuit breaker according to claim 2, characterized in that, The isolation circuit includes at least one of an isolation operational amplifier, a digital isolator, and an isolation power supply module.

4. The solid-state circuit breaker according to claim 1, characterized in that, A ground plane partition structure is provided between each of the functional circuits and the control circuit, which physically isolates each of the functional circuits from the control circuit.

5. The solid-state circuit breaker according to claim 4, characterized in that, The ground plane segmentation structure is disposed on the ground plane of the control circuit board, and each of the functional circuits and control circuits is integrated on the control circuit board. The ground plane of the control circuit board includes a physically isolated functional ground area and a control ground area. The functional circuit uses the functional ground area as a reference ground, and the control circuit uses the control ground area as a reference ground.

6. The solid-state circuit breaker according to claim 1, characterized in that, At least one functional circuit includes a measurement circuit, and the functional port includes a measurement port. The measurement circuit is configured to measure at least one of the voltage, current, and temperature of the main circuit via a measurement port.

7. The solid-state circuit breaker according to claim 1, characterized in that, At least one functional circuit includes a communication circuit, and the functional port includes a communication port. The communication circuit is configured to connect to an external device via a communication port.

8. The solid-state circuit breaker according to claim 1, characterized in that, At least one functional circuit includes a drive circuit, and the functional port includes a drive port. The drive circuit is configured to connect to the solid-state switch via a drive port and is configured to generate a drive signal based on a control signal generated by the control circuit and send the drive signal to the solid-state switch.

9. The solid-state circuit breaker according to claim 7, characterized in that, The communication circuit is also configured to send the operating status and measurement data of the solid-state circuit breaker to external devices, and The operating status includes at least one of switch status, alarm signal, and fault information, and the measured data includes at least one of voltage, current, and temperature of the main circuit.

10. The solid-state circuit breaker according to claim 7, characterized in that, External devices include at least one of the following: monitoring equipment, statistical intelligent equipment, superior control system, and cloud platform.

11. The solid-state circuit breaker according to claim 1, characterized in that, Solid-state switches are metal-oxide-semiconductor field-effect transistors.

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