Solid state circuit breaker

Abstract

The embodiment of the utility model provides a solid-state circuit breaker, which comprises a first power supply input end and a second power supply input end, which are used for receiving power supply input; the first power output end and the second power output end are used for providing power output; the first switching device and the second switching device are connected in series between the first power supply input end and the first power supply output end, and the first switching device and the second switching device can be turned off under the condition that the current input by the power supply exceeds a preset threshold value; at least one transient suppression diode connected in parallel to the first switching device and the second switching device; a third switching device, a first electrode of which is electrically coupled to the first switching device and a second electrode of which is electrically coupled to the second switching device; and the control unit is connected to the control end of the third switching device and can enable the third switching device to be switched on under the condition that the first switching device and the second switching device are switched off for a first preset duration.

Description

Technical Field

[0001] Embodiments of this disclosure relate to the field of electrical equipment, and more specifically to a solid-state circuit breaker. Background Technology

[0002] With the development of many emerging industries, traditional mechanical circuit breakers are struggling to meet the demands of applications with rapid fault current rise and large fault current amplitudes. Solid-state circuit breakers (SSCBs) are a special type of circuit breaker that uses transistor devices as switching elements. Compared to traditional mechanical circuit breakers, SSCBs are characterized by the absence of electric arcing and faster breaking speed, thus becoming a research hotspot in the current circuit breaker field. Utility Model Content

[0003] In a first aspect of this disclosure, a solid-state circuit breaker is provided, comprising: a first power input terminal and a second power input terminal for receiving power input; a first power output terminal and a second power output terminal for providing power output; a first switching device and a second switching device, the first switching device and the second switching device being connected in series between the first power input terminal and the first power output terminal, the first switching device and the second switching device being capable of turning off when the current of the power input exceeds a predetermined threshold; at least one transient suppression diode, the at least one transient suppression diode being connected in parallel to the first switching device and the second switching device; a third switching device, the first electrode of the third switching device being electrically coupled to the first electrode of the first switching device, the second electrode of the third switching device being electrically coupled to the second electrode of the second switching device; and a control unit, the first output terminal of the control unit being connected to the control terminal of the third switching device and capable of turning on the third switching device when the first switching device and the second switching device are turned off for a first predetermined duration.

[0004] In embodiments according to this disclosure, by employing a first switching device and a second switching device, the power input can be reliably turned off in the event of overcurrent. By employing at least one transient suppression diode, the power input can be reliably turned on when the first and second switching devices are turned off, thereby limiting the voltage amplitude of the power input to a low level. By employing a third switching device, the power input can be turned on by the control unit after the first and second switching devices have been turned off for a first predetermined duration, thereby enabling power input freewheeling and preventing prolonged power outages of downstream loads.

[0005] In some embodiments, the solid-state circuit breaker further includes a short-circuit protection unit. A first terminal of the short-circuit protection unit is connected to the second electrode of the first switching device, and a second terminal is connected to the first electrode of the second switching device. A first output terminal of the short-circuit protection unit is connected to the control terminal of the first switching device, and a second output terminal of the short-circuit protection unit is connected to the control terminal of the second switching device. The short-circuit protection unit can turn off the first and second switching devices when the current input to the power supply exceeds a predetermined threshold. A third output terminal of the short-circuit protection unit is connected to the first input terminal of the control unit. The short-circuit protection unit can generate a turn-off indication signal to indicate that the first and second switching devices are turned off. Upon receiving the turn-off indication signal, the control unit can turn on the third switching device after a first predetermined time delay.

[0006] In some embodiments, the solid-state circuit breaker further includes a switching unit, a first end of which is connected to a first electrode of a first switching device and a second end of which is connected to a second electrode of a second switching device. The output end of the switching unit is connected to a control unit and is capable of generating a turn-on control signal when the voltage at the first electrode of the first switching device is equal to the voltage at the second electrode of the second switching device. The control unit is capable of turning on the first switching device and the second switching device when it receives the turn-on control signal.

[0007] In some embodiments, the solid-state circuit breaker further includes a resistor, and the resistor and a third switching device are connected in series.

[0008] In some embodiments, the solid-state circuit breaker further includes a current detection unit, a first end of which is connected to a first power input terminal and a second end of which is connected to a node between at least one transient suppression diode and a first switching device. The output terminal of the current detection unit is connected to a second input terminal of the control unit. The current detection unit is capable of detecting the current of the power input and generating a current indication signal to indicate the magnitude of the power input current.

[0009] In some embodiments, the solid-state circuit breaker further includes: an input voltage detection unit, a first terminal of which is connected to a first power input terminal and a second terminal of which is connected to a second power input terminal, and an output terminal of which is connected to a third input terminal of the control unit. The input voltage detection unit is capable of detecting the voltage of the power input and generating an input voltage indication signal to indicate the magnitude of the power input voltage.

[0010] In some embodiments, the solid-state circuit breaker further includes: an output voltage detection unit, a first terminal of which is connected to a first power output terminal and a second terminal of which is connected to a second power output terminal, and an output terminal of which is connected to a fourth input terminal of the control unit. The output voltage detection unit is capable of detecting the voltage output by the power supply and generating an output voltage indication signal to indicate the magnitude of the voltage output by the power supply. The control unit is capable of turning on or off the first and second switching devices and turning off the third switching device based on the current indication signal, the input voltage indication signal, and the output voltage indication signal when the first and second switching devices are turned off for a second predetermined time. The second predetermined time is longer than the first predetermined time.

[0011] In some embodiments, the solid-state circuit breaker further includes a first disconnecting switch and a second disconnecting switch, wherein a first end of the first disconnecting switch is connected to a first power input terminal, a first end of the second disconnecting switch is connected to a second power input terminal, and a second end of the second disconnecting switch is connected to a node between an input voltage detection unit and a second power output terminal.

[0012] In some embodiments, the solid-state circuit breaker further includes an inductor, a first end of which is connected to a second end of the first disconnecting switch, and a second end of which is connected to a node between the current detection unit and the input voltage detection unit.

[0013] It should be understood that the content described in this section is not intended to limit the key or essential features of the embodiments of this disclosure, nor is it intended to restrict the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0014] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. In the drawings, the same or similar reference numerals denote the same or similar elements, wherein:

[0015] Figure 1 A circuit block diagram of a solid-state circuit breaker according to an embodiment of the present disclosure is shown;

[0016] Figure 2 The diagram shows voltage waveform variations at the power input and power output of a solid-state circuit breaker according to an embodiment of the present disclosure; and

[0017] Figure 3 A waveform diagram showing the current variation of the power input of a solid-state circuit breaker according to an embodiment of the present disclosure is shown. Detailed Implementation

[0018] Preferred embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art.

[0019] The term "comprising" and its variations as used herein signify open inclusion, i.e., "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "at least partially based on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first", "second", etc., may refer to different or the same objects.

[0020] As described above, solid-state circuit breakers (SSDs) offer advantages over traditional mechanical circuit breakers, including the absence of electric arcs and faster switching speeds. However, current SSDs can only easily disconnect the circuit in the event of a surge or short circuit, failing to guarantee that downstream loads will not lose power, thus impacting the user experience. Embodiments of this disclosure provide a SSD. By employing a first and a second switching device, reliable switching is possible in the event of an overcurrent in the power input. By employing at least one transient suppression diode, reliable switching is possible when the first and second switching devices are off, limiting the voltage amplitude of the power input to a low level. By employing a third switching device, it can be switched on by the control unit after the first and second switching devices have been off for a first predetermined duration, allowing for power input freewheeling and thus preventing prolonged power loss to downstream loads. In the following sections, [further details will be provided]. Figures 1 to 3 The principles of this disclosure are described.

[0021] Figure 1 A circuit block diagram of a solid-state circuit breaker 100 according to one embodiment of the present disclosure is shown. Figure 1As shown, the solid-state circuit breaker 100 generally includes a first power input terminal 1 and a second power input terminal 2, a first power output terminal 3 and a second power output terminal 4, a first switching device 11 and a second switching device 12, at least one transient suppression diode 20, a third switching device 13, and a control unit 30. The first power input terminal 1 and the second power input terminal 2 are used to receive power input. The first power output terminal 3 and the second power output terminal 4 are used to provide power output. The first switching device 11 and the second switching device 12 are connected in series between the first power input terminal 1 and the first power output terminal 3. The first switching device 11 and the second switching device 12 are capable of turning off when the current of the power input exceeds a predetermined threshold. At least one transient suppression diode 20 is connected in parallel to the first switching device 11 and the second switching device 12. The first electrode of the third switching device 13 is electrically coupled to the first electrode of the first switching device 11. The second electrode of the third switching device 13 is electrically coupled to the second electrode of the second switching device 12. The first output terminal of the control unit 30 is connected to the control terminal of the third switching device 13 and is capable of turning on the third switching device 13 if the first switching device 11 and the second switching device 12 are turned off for a first predetermined duration.

[0022] In some embodiments, the first switching device 11, the second switching device 12, and the third switching device 13 may be metal-oxide-semiconductor field-effect transistors (MOSFETs). When the first switching device 11, the second switching device 12, and the third switching device 13 are MOSFETs, the first electrode is the drain (D), and the second electrode is the source (S). The principles of this disclosure will be described below using MOSFETs as an example. However, it should be understood that the first switching device 11, the second switching device 12, and the third switching device 13 may also be other types, such as insulated-gate bipolar transistors (IGBTs), and the embodiments of this disclosure are not limited thereto.

[0023] In some embodiments, when there is an overcurrent in the power input and the first switching device 11 and the second switching device 12 are driven off, at least one transient suppression diode 20 can be broken down by the voltage on the main circuit where the first switching device 11 and the second switching device 12 are located. The at least one transient suppression diode 20, after being broken down, can clamp the voltage to limit its amplitude below the breakdown voltage of the first switching device 11 and the second switching device 12, thereby preventing damage to the first switching device 11 and the second switching device 12. Furthermore, the breakdown of the at least one transient suppression diode 20 can facilitate the commutation of current from the main circuit to the line where the at least one transient suppression diode 20 is located.

[0024] In some embodiments, such as Figure 1As shown, the number of at least one transient suppression diode 20 can be two. It should be understood that the number and parameters of the transient suppression diodes 20 can be determined according to the voltage amplitude of the power supply input and actual operating requirements, and this disclosure does not impose any limitations on this.

[0025] In some embodiments, the solid-state circuit breaker 100 may further include a short-circuit protection unit 40. A first terminal of the short-circuit protection unit 40 is connected to the second electrode of the first switching device 11, and a second terminal is connected to the first electrode of the second switching device 12. A first output terminal of the short-circuit protection unit 40 is connected to the control terminal of the first switching device 11. A second output terminal of the short-circuit protection unit 40 is connected to the control terminal of the second switching device 12. The short-circuit protection unit 40 is capable of turning off the first switching device 11 and the second switching device 12 if the current input to the power supply exceeds a predetermined threshold. A third output terminal of the short-circuit protection unit 40 is connected to the first input terminal of the control unit 30. The short-circuit protection unit 40 is capable of generating a turn-off indication signal to indicate that the first switching device 11 and the second switching device 12 are turned off. Upon receiving the turn-off indication signal, the control unit 30 is capable of turning on the third switching device 13 after a first predetermined delay.

[0026] In some embodiments, the short-circuit protection unit 40 may include a comparator circuit and a driver circuit. The comparator circuit generates a turn-off indication signal when the current at the power supply input is greater than a reference value, causing the driver circuit to output a drive signal, thereby driving the first switching device 11 and the second switching device 12 to turn off quickly. It should be understood that other types of short-circuit protection units that can be conceived by those skilled in the art based on the teachings given in this disclosure can achieve the above functions, and these implementations all fall within the scope of this disclosure.

[0027] In some embodiments, the solid-state circuit breaker 100 may further include a resistor 14. The resistor 14 is connected in series with the third switching device 13. By employing the resistor 14, the current input to the power supply can be limited to a low level when the third switching device 13 is turned on. By employing the control unit 30 to turn on the third switching device 13 after the first switching device 11 and the second switching device 12 have been turned off for a first predetermined duration, a commutation process can be realized from the line containing at least one transient suppression diode 20 to the line containing the third switching device 13 and the resistor 14, thereby providing a stable power output to the downstream load.

[0028] In some embodiments, the first predetermined duration may be, for example, 200 microseconds. In the case where the overcurrent in the power input is caused by a surge, by continuously shutting off the first switching device 11 and the second switching device 12 for the first predetermined duration, damage to the first switching device 11 and the second switching device 12 can be promptly avoided. It should be understood that the numerical values ​​appearing in the embodiments of this disclosure are merely examples and do not constitute a limitation on the scope of this disclosure.

[0029] In some embodiments, the solid-state circuit breaker 100 further includes a current detection unit 60. A first terminal of the current detection unit 60 is connected to a first power input terminal 1, and a second terminal is connected to a node between at least one transient suppression diode 20 and a first switching device 11. The output terminal of the current detection unit 60 is connected to a second input terminal of the control unit 30. The current detection unit 60 is capable of detecting the current input to the power supply and generating a current indication signal to indicate the magnitude of the current input to the power supply.

[0030] In some embodiments, the solid-state circuit breaker 100 further includes an input voltage detection unit 71. A first terminal of the input voltage detection unit 71 is connected to a first power input terminal 1, and a second terminal is connected to a second power input terminal 2. The output terminal of the input voltage detection unit 71 is connected to a third input terminal of the control unit 30. The input voltage detection unit 71 is capable of detecting the voltage of the power input and generating an input voltage indication signal to indicate the magnitude of the power input voltage.

[0031] In some embodiments, the solid-state circuit breaker 100 further includes an output voltage detection unit 72. A first terminal of the output voltage detection unit 72 is connected to a first power output terminal 3, and a second terminal is connected to a second power output terminal 4. The output terminal of the output voltage detection unit 72 is connected to a fourth input terminal of the control unit 30. The output voltage detection unit 72 is capable of detecting the voltage output by the power supply and generating an output voltage indication signal to indicate the magnitude of the output voltage.

[0032] In some embodiments, the control unit 30 may be a microcontroller unit (MCU). The control unit 30 is capable of turning the first switching device 11 and the second switching device 12 on or off, and turning off the third switching device 13, based on a current indication signal, an input voltage indication signal, and an output voltage indication signal, when the first switching device 11 and the second switching device 12 are turned off for a second predetermined period of time. It should be understood that other types of control units that can be conceived by those skilled in the art based on the teachings of this disclosure can implement the above functions, and such implementations all fall within the scope of this disclosure.

[0033] In some embodiments, the second predetermined duration may be, for example, 300 microseconds. The second predetermined duration may also be any value greater than the first predetermined duration, and this disclosure does not impose any limitations on this. When the power input current freewheels through the line containing the third switching device 13, the control unit 30 continuously receives and analyzes the current indication signal, the input voltage indication signal, and the output voltage indication signal within the second predetermined duration to determine the cause of the power input overcurrent. Specific determination criteria are shown in Table 1.

[0034] Table 1 Overcurrent Judgment Reference Table

[0035]

[0036]

[0037] Referring to Table 1, in some embodiments, the direction of current flow from the first power input terminal 1 to the first power output terminal 3 is taken as positive and the opposite direction as negative. The control unit 30 can determine whether the overcurrent of the power input is caused by a surge or a short circuit based on the voltage changes of the power input before and after the first switching device 11 and the second switching device 12 are turned off, the current changes of the power input after the first switching device 11 and the second switching device 12 are turned off, and the changes of the voltage and current of the power input after the first switching device 11 and the second switching device 12 have been turned off for a first predetermined period of time.

[0038] In some embodiments, if the cause of the overcurrent in the power input is determined to be a surge, the control unit 30 can reconnect the first switching device 11 and the second switching device 12 and turn off the third switching device 13. Since the surge has been avoided during a first predetermined time period between the turn-off of the first switching device 11 and the second switching device 12 and the turn-on of the third switching device 13, reconnecting the first switching device 11 and the second switching device 12 can restore normal power supply to the downstream load.

[0039] In some embodiments, if the cause of the overcurrent in the power input is determined to be a short circuit, the control unit 30 can turn off the third switching device 13 and keep the first switching device 11 and the second switching device 12 off, thereby protecting the downstream load.

[0040] In some embodiments, if the cause of the overcurrent in the power input cannot be determined by the judgment criteria shown in Table 1 within a second predetermined period of time, the control unit 30 may also turn off the third switching device 13 and keep the first switching device 11 and the second switching device 12 in the off state, thereby further protecting the downstream load.

[0041] Re-reference Figure 1In some embodiments, the solid-state circuit breaker 100 further includes a switching unit 50. A first terminal of the switching unit 50 is connected to a first electrode of the first switching device 11, and a second terminal is connected to a second electrode of the second switching device 12. The output terminal of the switching unit 50 is connected to a control unit 30. The reconnection process of the first switching device 11 and the second switching device 12 as described above can be implemented by the switching unit 50.

[0042] Specifically, when the voltage at the first electrode of the first switching device 11 is equal to the voltage at the second electrode of the second switching device 12, the switching unit 50 can generate a turn-on control signal. The control unit 30 can turn on the first switching device 11 and the second switching device 12 upon receiving the turn-on control signal. In this way, the effect of inrush current when reconnecting the first switching device 11 and the second switching device 12 can be avoided. In some embodiments, the switching unit 50 may include a comparator circuit to compare the voltage at the first electrode of the first switching device 11 and the voltage at the second electrode of the second switching device 12. It should be understood that other types of switching units that can be conceived by those skilled in the art based on the teachings of this disclosure implement the above functions, and these implementations all fall within the scope of this disclosure.

[0043] In some embodiments, the solid-state circuit breaker 100 may further include a first disconnecting switch 81 and a second disconnecting switch 82. A first end of the first disconnecting switch 81 is connected to a first power input terminal 1. A first end of the second disconnecting switch 82 is connected to a second power input terminal 2, and a second end is connected to the node between the input voltage detection unit 71 and the second power output terminal 4. By employing the first disconnecting switch 81 and the second disconnecting switch 82, the circuit can be reliably connected and disconnected.

[0044] In some embodiments, the solid-state circuit breaker 100 may further include an inductor 90. A first terminal of the inductor 90 is connected to a second terminal of the first disconnecting switch 81. The second terminal of the inductor 90 is connected to a node between the current sensing unit 60 and the input voltage sensing unit 71. By employing the inductor 90, the power input can be reliably current-limited to prevent excessive current fluctuations.

[0045] Figure 2 A voltage waveform diagram of the power input and power output of a solid-state circuit breaker 100 according to an embodiment of the present disclosure is shown. Figure 3 A current waveform variation diagram of the power input 100 of a solid-state circuit breaker according to an embodiment of the present disclosure is shown. In some embodiments, such as Figure 2 As shown, curve 201 represents the voltage change at the power input, while curve 202 represents the voltage change at the power output. It can be seen that the voltage amplitudes at both the power input and output rise briefly due to overcurrent before gradually stabilizing.

[0046] refer to Figure 3 In some embodiments, curve 300 represents the current variation curve of the power input. Taking a surge as an example of an overcurrent in the power input, it can be seen that after the power input current rises, it gradually returns to the level before the rise, and is not cut off due to a brief overcurrent, thus avoiding prolonged power loss of downstream loads and improving the stability of the power supply.

[0047] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, and are not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A solid-state circuit breaker (100), characterized in that, include: The first power input terminal (1) and the second power input terminal (2) are used to receive power input; The first power output terminal (3) and the second power output terminal (4) are used to provide power output; A first switching device (11) and a second switching device (12) are connected in series between the first power input terminal (1) and the first power output terminal (3). The first switching device (11) and the second switching device (12) can be turned off when the current of the power input exceeds a predetermined threshold. At least one transient suppression diode (20) is connected in parallel to the first switching device (11) and the second switching device (12); A third switching device (13), wherein the first electrode of the third switching device (13) is electrically coupled to the first electrode of the first switching device (11), and the second electrode of the third switching device (13) is electrically coupled to the second electrode of the second switching device (12); as well as A control unit (30) has its first output terminal connected to the control terminal of the third switching device (13) and is capable of turning on the third switching device (13) when the first switching device (11) and the second switching device (12) are turned off for a first predetermined time.

2. The solid-state circuit breaker (100) according to claim 1, characterized in that, The solid-state circuit breaker (100) further includes a short-circuit protection unit (40). The first end of the short-circuit protection unit (40) is connected to the second electrode of the first switching device (11), and the second end is connected to the first electrode of the second switching device (12). The first output end of the short-circuit protection unit (40) is connected to the control end of the first switching device (11), and the second output end of the short-circuit protection unit (40) is connected to the control end of the second switching device (12). The short-circuit protection unit (40) can turn off the first switching device (11) and the second switching device (12) when the current input to the power supply exceeds a predetermined threshold. The third output end of the short-circuit protection unit (40) is connected to the first input end of the control unit (30). The short-circuit protection unit (40) can generate a turn-off indication signal to indicate that the first switching device (11) and the second switching device (12) are turned off. The control unit (30) can turn on the third switching device (13) after delaying for a first predetermined time after receiving the turn-off indication signal.

3. The solid-state circuit breaker (100) according to claim 1, characterized in that, The solid-state circuit breaker (100) further includes a switching unit (50), the first end of which is connected to the first electrode of the first switching device (11) and the second end of which is connected to the second electrode of the second switching device (12). The output end of the switching unit (50) is connected to the control unit (30) and can generate a turn-on control signal when the voltage at the first electrode of the first switching device (11) is equal to the voltage at the second electrode of the second switching device (12). The control unit (30) can turn on the first switching device (11) and the second switching device (12) when it receives the turn-on control signal.

4. The solid-state circuit breaker (100) according to claim 1, characterized in that, The solid-state circuit breaker (100) also includes a resistor (14), which is connected in series with the third switching device (13).

5. The solid-state circuit breaker (100) according to claim 1, characterized in that, The solid-state circuit breaker (100) further includes a current detection unit (60), the first end of which is connected to the first power input terminal (1) and the second end of which is connected to the node between the at least one transient suppression diode (20) and the first switching device (11). The output terminal of the current detection unit (60) is connected to the second input terminal of the control unit (30). The current detection unit (60) is capable of detecting the current of the power input and generating a current indication signal to indicate the magnitude of the current of the power input.

6. The solid-state circuit breaker (100) according to claim 5, characterized in that, The solid-state circuit breaker (100) also includes: An input voltage detection unit (71) is provided, wherein a first end of the input voltage detection unit (71) is connected to the first power input terminal (1) and a second end is connected to the second power input terminal (2), and an output terminal of the input voltage detection unit (71) is connected to the third input terminal of the control unit (30). The input voltage detection unit (71) is capable of detecting the voltage of the power input and generating an input voltage indication signal to indicate the magnitude of the power input voltage.

7. The solid-state circuit breaker (100) according to claim 6, characterized in that, The solid-state circuit breaker (100) also includes: An output voltage detection unit (72) is provided, wherein a first end of the output voltage detection unit (72) is connected to the first power output terminal (3) and a second end is connected to the second power output terminal (4), and the output terminal of the output voltage detection unit (72) is connected to the fourth input terminal of the control unit (30). The output voltage detection unit (72) is capable of detecting the voltage output by the power supply and generating an output voltage indication signal to indicate the magnitude of the voltage output by the power supply. The control unit (30) is capable of turning the first switching device (11) and the second switching device (12) on or off and turning off the third switching device (13) based on the current indication signal, the input voltage indication signal and the output voltage indication signal, when the first switching device (11) and the second switching device (12) are turned off for a second predetermined duration, wherein the second predetermined duration is longer than the first predetermined duration.

8. The solid-state circuit breaker (100) according to claim 7, characterized in that, The solid-state circuit breaker (100) further includes a first disconnecting switch (81) and a second disconnecting switch (82). The first end of the first disconnecting switch (81) is connected to the first power input terminal (1), the first end of the second disconnecting switch (82) is connected to the second power input terminal (2), and the second end is connected to the node between the input voltage detection unit (71) and the second power output terminal (4).

9. The solid-state circuit breaker (100) according to claim 8, characterized in that, The solid-state circuit breaker (100) further includes an inductor (90), the first end of which is connected to the second end of the first disconnecting switch (81), and the second end of which is connected to the node between the current detection unit (60) and the input voltage detection unit (71).

Images