Circuit breaker and electrical system

Abstract

The embodiment of the utility model provides a circuit breaker and an electrical system. An isolating switch of the circuit breaker is electrically connected between an anode input end and an anode output end of the circuit breaker and / or electrically connected between a cathode input end and a cathode output end of the circuit breaker. The first voltage detection unit is electrically connected between the positive input end and the negative input end. The first voltage detection unit can generate an enable signal under the condition that the absolute value of the input voltage between the positive pole input end and the negative pole input end rises to be larger than a first voltage threshold value, wherein the first voltage threshold value is smaller than the rated voltage value of the circuit breaker. The energy storage tripping module is coupled to the isolation switch. The power supply module is electrically connected to the first voltage detection unit and the energy storage tripping module. And the power supply module can supply power to the energy storage tripping module under the condition of receiving the enable signal. By means of the arrangement, when the input voltage between the positive pole input end and the negative pole input end does not reach the rated voltage value, power can be supplied to the energy storage tripping module in advance through the power supply module.

Description

TECHNICAL FIELD

[0001] Embodiments of the present disclosure generally relate to the field of electrical equipment, and in particular, to a circuit breaker and an electrical system. BACKGROUND

[0002] Solid-state electronic switching devices are the core functional elements of solid-state circuit breakers, which have high-speed switching characteristics and can improve the on-off performance of the circuit breaker. Due to the unpredictability of inductance in the actual circuit, as well as the complexity and dynamic changes of the entire power system, the solid-state circuit breaker may frequently encounter periodic overvoltage and reverse voltage surges during operation. In some conventional circuit breakers, transient voltage suppression diodes can be used to absorb transient high voltage. However, in some solid-state circuit breakers, the reverse connection protection scheme of the solid-state circuit breaker has too long a delay, and if a continuous overvoltage or power reverse connection is encountered before the mechanical main switch is closed, the transient voltage suppression diode will face the risk of damage. SUMMARY

[0003] An object of embodiments of the present disclosure is to provide a circuit breaker and an electrical system to at least partially solve the above problems and other potential problems.

[0004] In a first aspect of the present disclosure, a circuit breaker is provided. The circuit breaker comprises: a disconnector electrically connected between a positive input terminal and a positive output terminal of the circuit breaker and / or electrically connected between a negative input terminal and a negative output terminal of the circuit breaker; a first voltage detection unit electrically connected between the positive input terminal and the negative input terminal, the first voltage detection unit being capable of generating an enable signal in a case where an absolute value of an input voltage between the positive input terminal and the negative input terminal rises to be greater than a first voltage threshold, wherein the first voltage threshold is less than a rated voltage value of the circuit breaker; an energy storage tripping module coupled to the disconnector; and a power supply module electrically connected to the first voltage detection unit and the energy storage tripping module, the power supply module being capable of supplying power to the energy storage tripping module in a case where the enable signal is received.

[0005] In some embodiments, the power supply module comprises: a main auxiliary power supply electrically connected between the positive input terminal and the negative input terminal, the main auxiliary power supply being capable of converting a voltage between the positive input terminal and the negative input terminal into a first direct current voltage; and a voltage conversion circuit electrically connected to the main auxiliary power supply, the first voltage detection unit, and the energy storage tripping module, the voltage conversion circuit being capable of operating to convert the first direct current voltage into a second direct current voltage for supplying power to the energy storage tripping module in a case where the enable signal is received.

[0006] In some embodiments, the circuit breaker further comprises: a solid state switch module electrically connected between the disconnector and the positive output terminal; and a second voltage detection unit electrically connected to both ends of the solid state switch module to detect a voltage value at both ends of the solid state switch module, and electrically connected to the energy storage trip module, the second voltage detection unit being capable of sending a first signal to the energy storage trip module in a case where an absolute value of the voltage value at both ends of the solid state switch module is greater than a second voltage threshold, to cause the energy storage trip module to perform a tripping operation at least in a case where the first signal is received, the second voltage threshold being greater than the rated voltage value.

[0007] In some embodiments, the circuit breaker further comprises: a third voltage detection unit electrically connected to the energy storage trip module to detect an energy storage voltage value of the energy storage trip module, and capable of sending a second signal to the energy storage trip module in a case where the energy storage voltage value is greater than a third voltage threshold, to cause the energy storage trip module to perform a tripping operation in a case where the first signal and the second signal are received, the third voltage threshold being greater than or equal to the second direct current voltage.

[0008] In some embodiments, the circuit breaker further comprises: a control unit electrically connected to the second voltage detection unit and the solid state switch module, and the control unit being capable of controlling the solid state switch module to operate based on an absolute value of the voltage at both ends of the solid state switch module.

[0009] In some embodiments, the control unit is electrically connected to the voltage conversion circuit, and the control unit is capable of controlling the voltage conversion circuit to operate to cause the voltage conversion circuit to convert the first direct current voltage into the second direct current voltage for powering the energy storage trip module.

[0010] In some embodiments, the circuit breaker further comprises: a voltage suppression module electrically connected to both ends of the solid state switch module.

[0011] In some embodiments, the solid state switch module comprises: a first solid state switch unit, a drain of the first solid state switch unit being electrically connected to the positive input terminal; and a second solid state switch unit, a drain of the second solid state switch unit being electrically connected to the positive output terminal, and a source of the second solid state switch unit being electrically connected to a source of the first solid state switch unit.

[0012] In some embodiments, the circuit breaker further comprises: a surge current limiting unit electrically connected between the positive input terminal and the solid state switch module.

[0013] In some embodiments, the circuit breaker further comprises: a fourth voltage detection unit electrically connected between the positive output terminal and the negative output terminal to detect an output voltage of the circuit breaker.

[0014] In a second aspect of the present disclosure, an electrical system is provided. The electrical system comprises the circuit breaker of the first aspect of the present disclosure.

[0015] In some embodiments, the electrical system further includes a photovoltaic panel control circuit electrically connected to the positive output terminal and the negative output terminal.

[0016] In embodiments of the present disclosure, the circuit breaker includes a disconnector, a first voltage detection unit, an energy storage tripping module, and a power supply module. The disconnector is electrically connected between the positive input terminal and the positive output terminal of the circuit breaker and / or electrically connected between the negative input terminal and the negative output terminal of the circuit breaker. The first voltage detection unit is electrically connected between the positive input terminal and the negative input terminal. The first voltage detection unit is capable of generating an enable signal in the case that the absolute value of the input voltage between the positive input terminal and the negative input terminal rises to be greater than a first voltage threshold, wherein the first voltage threshold is less than the rated voltage value of the circuit breaker. The energy storage tripping module is coupled to the disconnector. The power supply module is electrically connected to the first voltage detection unit and the energy storage tripping module. The power supply module is capable of supplying power to the energy storage tripping module in the case that the enable signal is received. With this arrangement, the energy storage tripping module can be pre-supplied with power by the power supply module when the input voltage between the positive input terminal and the negative input terminal has not yet risen to the rated voltage value. In this process, there is no need to wait for the process of other electronic elements to be powered on and initialized, thereby shortening the tripping preparation time length of the energy storage tripping module. Even in the case that there is a continuous overvoltage or power source reverse connection before the disconnector is closed, the energy storage tripping module can quickly disconnect the disconnector, thereby avoiding damage to the electronic elements in the circuit breaker.

[0017] It should be understood that the content described in this section is not intended to limit the key features or important features of the embodiments of the present disclosure, nor is it used to limit the scope of the present disclosure. Other features of the present disclosure will become apparent through the following description. BRIEF DESCRIPTION OF DRAWINGS

[0018] The above and other features, advantages, and aspects of embodiments of the present disclosure will become more apparent by describing in detail the following embodiments with reference to the attached drawings. In the drawings, the same or similar reference signs indicate the same or similar elements, in which:

[0019] Figure 1 A circuit block diagram of a circuit breaker of an embodiment of the present disclosure is shown;

[0020] Figure 2 A power-on process schematic diagram of a circuit breaker of an embodiment of the present disclosure and a conventional circuit breaker is shown, in which the solid line shows the power-on process of the circuit breaker of the embodiment of the present disclosure, and the dashed line shows the power-on process of the conventional circuit breaker; and

[0021] Figure 3 A circuit block diagram of an electrical system of an embodiment of the present disclosure is shown.

[0022] BRIEF DESCRIPTION OF DRAWINGS

[0023] 10, circuit breaker; 101, positive input terminal; 102, positive output terminal; 103, negative input terminal; 104, negative output terminal;

[0024] 11, disconnector;

[0025] 12, first voltage detection unit;

[0026] 13, energy storage tripping module;

[0027] 14, power supply module; 141, main auxiliary power supply; 142, voltage conversion circuit;

[0028] 15, solid state switch module; 151, first solid state switch unit; 152, second solid state switch unit;

[0029] 16, second voltage detection unit;

[0030] 17, third voltage detection unit;

[0031] 18, control unit;

[0032] 191, voltage suppression module; 192, inrush current limiting unit; 193, fourth voltage detection unit;

[0033] 20, photovoltaic panel control circuit;

[0034] 30, DC microgrid controller;

[0035] 40, DC power supply bus. DETAILED DESCRIPTION

[0036] Preferred embodiments of the present disclosure will be described in greater detail below, with reference to the accompanying drawings. While preferred embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be embodied in various forms without being limited by 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.

[0037] The term "comprising" and variations thereof as used herein are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements is not necessarily limited to those elements, but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Unless otherwise specified, the term "or" as used herein is intended to mean "and / or". The term "based on" means "based, at least in part, on". The terms "one example embodiment" and "an embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first", "second", and the like can refer to different or identical objects.

[0038] As mentioned above, transient voltage suppressor diodes can be used in some conventional circuit breakers to absorb instantaneous high voltage. However, in some solid-state circuit breakers, the reverse connection protection scheme has too long a delay. If a continuous overvoltage or reverse power connection occurs before the mechanical main switch closes, the transient voltage suppressor diode will be at risk of damage.

[0039] Embodiments of this disclosure provide a circuit breaker and electrical system. In this circuit breaker, a disconnecting switch is electrically connected between the positive input terminal and the positive output terminal of the circuit breaker and / or electrically connected between the negative input terminal and the negative output terminal of the circuit breaker. A first voltage detection unit is electrically connected between the positive input terminal and the negative input terminal. The first voltage detection unit can generate an enable signal when the absolute value of the input voltage between the positive input terminal and the negative input terminal rises to a value greater than a first voltage threshold, wherein the first voltage threshold is less than the rated voltage value of the circuit breaker. An energy storage trip module is coupled to the disconnecting switch. A power supply module is electrically connected to the first voltage detection unit and the energy storage trip module. The power supply module can supply power to the energy storage trip module upon receiving the enable signal. With this arrangement, the energy storage trip module can be pre-powered by the power supply module before the input voltage between the positive input terminal and the negative input terminal rises to the rated voltage value. In this process, there is no need to wait for the power-on initialization process of other electronic components, thereby shortening the trip preparation time of the energy storage trip module. Even in the event of continuous overvoltage or reverse power connection before the disconnecting switch closes, the energy storage trip module can quickly disconnect the disconnecting switch, thereby preventing damage to the electronic components inside the circuit breaker. The following will combine... Figures 1 to 3 The principles of this disclosure will be described in detail below.

[0040] like Figure 1 As shown, the circuit breaker 10 includes a disconnecting switch 11, a first voltage detection unit 12, an energy storage tripping module 13, and a power supply module 14. The disconnecting switch 11 is the mechanical main switch in the circuit breaker 10, and can control the opening and closing of the circuit through mechanical components, such as contact assemblies. In some embodiments, the disconnecting switch 11 can be electrically connected between the positive input terminal 101 and the positive output terminal 102 of the circuit breaker 10. In this way, when a fault occurs on the positive side of the circuit breaker 10, the disconnecting switch 11 can quickly open, cutting off the current flow and protecting the circuit from further damage.

[0041] In another embodiment, the disconnecting switch 11 can also be electrically connected between the negative input terminal 103 and the negative output terminal 104 of the circuit breaker 10. When an abnormality occurs on the negative side of the circuit breaker 10, the disconnecting switch 11 can respond quickly, cut off the current path on the negative side, and prevent the fault from escalating.

[0042] In other embodiments, disconnecting switches 11 can be provided on both the positive and negative sides of the circuit breaker 10. In this case, there can be two disconnecting switches 11. One of the two disconnecting switches 11 is electrically connected between the positive input terminal 101 and the positive output terminal 102 of the circuit breaker 10, and the other of the two disconnecting switches 11 is electrically connected between the negative input terminal 103 and the negative output terminal 104 of the circuit breaker 10. In this way, the double disconnecting switches 11 can provide more comprehensive circuit protection, quickly cutting off the corresponding current path regardless of whether a fault occurs on the positive or negative side, thus reducing the impact of the fault on the circuit.

[0043] like Figure 1 As shown, the first voltage detection unit 12 is electrically connected between the positive input terminal 101 and the negative input terminal 103. The first voltage detection unit 12 can monitor the input voltage between the positive input terminal 101 and the negative input terminal 103 in real time. When the absolute value of the input voltage between the positive input terminal 101 and the negative input terminal 103 rises above a preset first voltage threshold, the first voltage detection unit 12 generates an enable signal. The first voltage threshold is less than the rated voltage of the circuit breaker 10. In this way, during the power-on process after the circuit breaker 10 is energized, the input voltage gradually increases, but the circuit breaker 10 can take timely protective measures when the input voltage rises but has not yet reached a dangerous level.

[0044] Furthermore, in the embodiments of this disclosure, controlling the operating state of the circuit breaker by the absolute value of the voltage can effectively accommodate both forward and reverse overvoltage situations. When the detected absolute value of the voltage exceeds a preset threshold, the circuit breaker 10 will take corresponding protective measures regardless of whether the voltage is forward or reverse.

[0045] In some embodiments, the rated voltage can be 750V and the first voltage threshold can be 300V. It should be understood that the rated voltage and the first voltage threshold can be determined according to the actual operating environment of the circuit breaker 10, as long as the first voltage threshold is less than the rated voltage of the circuit breaker 10. This disclosure is not intended to limit the specific values.

[0046] like Figure 1 As shown, the energy storage trip module 13 is coupled to the disconnecting switch 11. The energy storage trip module 13 includes an energy storage unit and an actuation unit. The energy storage unit is responsible for storing energy; common energy storage elements include springs, capacitors, or electromagnetic coils. When the energy storage trip module 13 receives electrical energy from the power supply module 14, the energy storage unit begins to store energy. The energy stored in the energy storage unit can be quickly released when needed. The actuation unit is responsible for converting the energy released by the energy storage unit into mechanical motion, driving the disconnecting switch 11 to open.

[0047] like Figure 1As shown, the power supply module 14 is electrically connected to the first voltage detection unit 12 and the energy storage trip module 13. When the first voltage detection unit 12 detects that the absolute value of the input voltage between the positive input terminal 101 and the negative input terminal 103 rises to a preset first voltage threshold, it generates an enable signal. After receiving the enable signal, the power supply module 14 supplies power to the energy storage trip module 13. After receiving the electrical energy, the energy storage trip module 13 begins to store energy.

[0048] like Figure 2 As shown, the solid line illustrates the power-on process of the circuit breaker 10 according to an embodiment of this disclosure. The dashed line illustrates the power-on process of a conventional circuit breaker 10. Power can be supplied to the energy storage trip module 13 in advance via the power supply module before the input voltage between the positive input terminal 101 and the negative input terminal 103 rises to the rated voltage value. In this process, there is no need to wait for the power-on initialization delay of the control unit 18, thereby shortening the trip preparation time of the energy storage trip module 13. Even in the event of continuous overvoltage or reverse power connection before the disconnecting switch 11 closes, the energy storage trip module 13 can quickly open the disconnecting switch 11, thereby avoiding damage to the electronic components within the circuit breaker 10.

[0049] In some embodiments, such as Figure 1 As shown, the power supply module 14 includes a main auxiliary power supply 141 and a voltage conversion circuit 142. The main auxiliary power supply 141 is electrically connected between the positive input terminal 101 and the negative input terminal 103, and can convert the input voltage between the positive input terminal 101 and the negative input terminal 103 into a first DC voltage, thereby providing a stable DC power supply for the electronic components within the circuit breaker 10. The voltage conversion circuit 142 is electrically connected to the main auxiliary power supply 141, the first voltage detection unit 12, and the energy storage trip module 13. The voltage conversion circuit 142 can operate upon receiving an enable signal to convert the first DC voltage provided by the main auxiliary power supply 141 into a second DC voltage suitable for use by the energy storage trip module 13.

[0050] In this way, when the first voltage detection unit 12 detects that the absolute value of the input voltage between the positive input terminal 101 and the negative input terminal 103 rises above a preset first voltage threshold, it generates an enable signal. The enable signal is sent to the voltage conversion circuit 142, triggering its operation. The voltage conversion circuit 142 converts the first DC voltage provided by the main auxiliary power supply 141 into a second DC voltage. The second DC voltage can be supplied to the energy storage trip module 13 to provide energy to the energy storage unit of the energy storage trip module 13.

[0051] In some embodiments, such as Figure 1As shown, the circuit breaker 10 further comprises a solid state switch module 15 and a second voltage detection unit 16. The solid state switch module 15 is electrically connected between the disconnector 11 and the positive output terminal 102. The solid state switch module 15 can quickly cut off the current in abnormal situations to protect the circuit and the device. The second voltage detection unit 16 is electrically connected to both ends of the solid state switch module 15 to detect the voltage value across the solid state switch module 15. In addition, the second voltage detection unit 16 is also electrically connected to the energy storage tripping module 13, which can trigger the protection mechanism when an abnormal voltage is detected.

[0052] With this arrangement, the second voltage detection unit 16 monitors the voltage value across the solid state switch module 15 to determine whether the circuit is in a normal working state. When the absolute value of the voltage value across the solid state switch module 15 is greater than a preset second voltage threshold, the second voltage detection unit 16 generates a first signal and sends it to the energy storage tripping module 13. Here, the second voltage threshold is greater than the rated voltage value of the circuit breaker 10. When the voltage abnormally rises to a dangerous level, the circuit breaker 10 can take timely protection measures. The second voltage threshold can be set to the maximum breakdown voltage value that the circuit protection elements in the circuit breaker 10 can withstand, thereby avoiding damage to the circuit protection elements.

[0053] In some embodiments, the second voltage detection unit 16 internally contains a comparator. The comparator is used to compare the absolute value of the voltage value across the solid state switch module 15 with the size of the second voltage threshold. When the absolute value of the voltage value across the solid state switch module 15 exceeds 920V, the comparator will flip and trigger a fixed delay mechanism. The delay time can be set to 5 milliseconds to avoid false actions caused by transient voltage fluctuations. During the 5 millisecond delay period, the system continues to monitor the voltage value to confirm whether the voltage indeed exceeds the second voltage threshold. If the voltage value still exceeds 920V after 5 milliseconds, the second voltage detection unit 16 will issue an off signal and a first signal.

[0054] The second voltage detection unit 16 is electrically connected to the solid state switch module 15 and the energy storage tripping module 13. After receiving the off signal, the solid state switch module 15 cuts off the current to prevent the current from continuing to flow through the circuit. After receiving the first signal, the energy storage tripping module 13 rapidly releases the stored energy to drive the trigger mechanism in the action execution unit. The trigger mechanism converts the released energy into mechanical force to push the disconnector 11 to quickly disconnect and completely cut off the circuit.

[0055] In some embodiments, as Figure 1As shown, the circuit breaker 10 also includes a third voltage detection unit 17. The third voltage detection unit 17 is electrically connected to the energy storage trip module 13 and can detect the energy storage voltage value of the energy storage trip module 13. When the energy storage voltage value is greater than a preset third voltage threshold, the third voltage detection unit 17 sends a second signal to the energy storage trip module 13. The second signal indicates that the energy storage unit of the energy storage trip module 13 has completed the energy storage process and has the energy required to drive the disconnecting switch 11 to disconnect. The third voltage threshold is set to be greater than or equal to a second DC voltage to ensure that the energy storage unit receives sufficient electrical energy.

[0056] With this arrangement, the energy storage trip module 13 needs to receive both the first and second signals simultaneously to perform a trip operation. The first signal indicates the presence of an abnormal voltage in the circuit. The second signal indicates that the energy storage unit has completed energy storage. The first and second signals are combined through a logic AND operation to ensure that the energy storage trip module 13 will only drive the isolating switch 11 to open when both overvoltage and energy storage completion are detected simultaneously.

[0057] As an example, when the second voltage detection unit 16 detects that the absolute value of the voltage across the solid-state switch module 15 exceeds 920V, it generates a first signal and triggers a fixed delay of 5 milliseconds. After the delay, if the voltage value still exceeds 920V, the second voltage detection unit 16 issues a shutdown signal and the first signal. Simultaneously, the third voltage detection unit 17 continuously monitors the energy storage voltage of the energy storage trip module 13. When the energy storage voltage reaches or exceeds a third voltage threshold, the third voltage detection unit 17 generates a second signal. The energy storage trip module 13 will only trip upon receiving the first and second signals, thus completely cutting off the circuit.

[0058] In some embodiments, such as Figure 1 As shown, the circuit breaker 10 also includes a control unit 18. The control unit 18 is electrically connected to the second voltage detection unit 16 and the solid-state switch module 15, and can control the operation of the solid-state switch module 15 based on the absolute value of the voltage across the solid-state switch module 15.

[0059] Specifically, the second voltage detection unit 16 is responsible for detecting the voltage across the solid-state switch module 15. When the absolute value of the voltage across the solid-state switch module 15 is detected to be higher than a preset threshold (e.g., 880V), the control unit 18 begins counting at a fixed accumulation rate. If the voltage value is lower than 880V, the control unit 18 counts at another fixed decrement rate. Once the count reaches a 10-millisecond tripping threshold, the control unit 18 issues a signal to shut down the solid-state switch module 15 and a first signal. In this way, when the voltage rises abnormally, the solid-state switch module 15 can respond quickly and cut off the current, thereby protecting the circuit and equipment from damage.

[0060] In some embodiments, such as Figure 1 As shown, the control unit 18 is also electrically connected to the voltage conversion circuit 142. The control unit 18 can control the conduction of the voltage conversion circuit 142, thereby controlling the voltage conversion circuit 142 to convert the first DC voltage into a second DC voltage to supply power to the energy storage trip module 13. With this arrangement, during the power-on process of the circuit breaker 10, if the absolute value of the input voltage between the positive input terminal 101 and the negative input terminal 103 rises slowly, for example, after the control unit 18 completes the power-on initialization, the absolute value of the input voltage has not yet risen to the first voltage threshold. At this time, the control unit 18 will control the voltage conversion circuit 142 to conduct, thereby ensuring that the power supply module 14 charges the energy storage trip module 13 in a timely manner.

[0061] Therefore, there are two ways to charge the energy storage trip module 13: One is under normal operating conditions, when the first voltage detection unit 12 detects that the absolute value of the input voltage exceeds the first voltage threshold, it controls the power supply module 14 to charge the energy storage trip module 13. The other is during the power-on process of the circuit breaker 10, if the input voltage rises slowly, the control unit 18 will actively control the voltage conversion circuit 142 to conduct, ensuring that the energy storage trip module 13 is charged in a timely manner. These two methods complement each other, ensuring that the energy storage trip module 13 can quickly obtain the required energy under any circumstances, thereby improving the response speed and reliability of the circuit breaker 10.

[0062] In some embodiments, such as Figure 1 As shown, the circuit breaker 10 also includes a voltage suppression module 191. The voltage suppression module 191 protects the circuit from damage caused by transient overvoltages. The voltage suppression module 191 is electrically connected across the solid-state switch module 15, for example, by connecting one or more transient voltage suppression diodes in parallel across the solid-state switch module 15. When the voltage across the solid-state switch module 15 suddenly rises above the breakdown voltage of the transient voltage suppression diode, the transient voltage suppression diode will conduct, dissipating the excess voltage and keeping the voltage within a safe range, preventing overvoltage from damaging the solid-state switch module 15 and its downstream circuitry.

[0063] In some embodiments, such as Figure 1 As shown, the solid-state switch module 15 includes a first solid-state switch unit 151 and a second solid-state switch unit 152. The drain of the first solid-state switch unit 151 is electrically connected to the positive input terminal 101. The drain of the second solid-state switch unit 152 is electrically connected to the positive output terminal 102, and the source of the second solid-state switch unit 152 is electrically connected to the source of the first solid-state switch unit 151. In this way, the first solid-state switch unit 151 and the second solid-state switch unit 152 are reverse-connected, thereby enabling the circuit to cope with forward overvoltage and reverse overvoltage.

[0064] When a forward overvoltage occurs in the circuit, the first solid-state switch unit 151 will respond quickly and cut off the current, preventing overvoltage from damaging the circuit. In the case of a reverse overvoltage in the circuit, the second solid-state switch unit 152 will act, also quickly cutting off the current, protecting the circuit from reverse voltage. The bidirectional protection mechanism of the solid-state switch module 15 can make the circuit breaker 10 provide reliable protection in various voltage abnormal situations, improving the safety and reliability of the circuit breaker 10.

[0065] In some embodiments, as shown in FIG. 1, the circuit breaker 10 further includes a surge current limiting unit 192. The surge current limiting unit 192 is electrically connected between the positive input end 101 and the solid-state switch module 15. The surge current limiting unit 192 can limit the peak value of the current when the circuit is started or encounters a transient event, ensuring that the current flowing into the solid-state switch module 15 and other sensitive components remains within a safe range. Figure 1

[0066] In some embodiments, as shown in FIG. 1, the circuit breaker 10 further includes a fourth voltage detection unit 193. The fourth voltage detection unit 193 is electrically connected between the positive output end 102 and the negative output end 104, and can detect the output voltage value of the circuit breaker 10 in real time. By continuously monitoring the output voltage, the fourth voltage detection unit 193 can timely discover abnormalities of the output voltage, such as overvoltage, undervoltage, or voltage fluctuation, etc. Figure 1

[0067] In a second aspect of the present disclosure, as shown in FIG. 1, an electrical system is provided. The electrical system includes any one of the above-described circuit breakers 10. Figure 3

[0068] ​​​In the circuit breaker 10 of the electrical system, the disconnector 11 is electrically connected between the positive input terminal 101 and the positive output terminal 102 of the circuit breaker 10 and / or between the negative input terminal 103 and the negative output terminal 104 of the circuit breaker 10. The first voltage detection unit 12 is electrically connected between the positive input terminal 101 and the negative input terminal 103. The first voltage detection unit 12 can generate an enable signal when the absolute value of the input voltage between the positive input terminal 101 and the negative input terminal 103 rises to be greater than a first voltage threshold value, wherein the first voltage threshold value is less than the rated voltage value of the circuit breaker 10. The energy storage tripping module 13 is coupled to the disconnector 11. The power supply module 14 is electrically connected to the first voltage detection unit 12 and the energy storage tripping module 13. The power supply module 14 can supply power to the energy storage tripping module 13 upon receiving the enable signal. With this arrangement, the energy storage tripping module 13 can be pre-powered by the power supply module before the input voltage between the positive input terminal 101 and the negative input terminal 103 rises to the rated voltage value. In this process, there is no need to wait for the delay of the control unit 18 power-on initialization, thereby shortening the tripping preparation time of the energy storage tripping module 13. Even in the case of continuous overvoltage or power supply reverse connection before the disconnector 11 is closed, the energy storage tripping module 13 can quickly disconnect the disconnector 11, thereby avoiding damage to the electronic components in the circuit breaker 10.

[0069] In some embodiments, as shown in FIG. 1, the electrical system further includes a photovoltaic panel control circuit 20. The photovoltaic panel control circuit 20 is electrically connected to the positive output terminal 102 and the negative output terminal 104 of the circuit breaker 10, and by monitoring and adjusting the output voltage and current of the photovoltaic panel, the stability and efficiency of the power system can be ensured. Figure 3

[0070] In some embodiments, as shown in FIG. 1, the electrical system further includes a photovoltaic panel control circuit 20. The photovoltaic panel control circuit 20 is electrically connected to the positive output terminal 102 and the negative output terminal 104 of the circuit breaker 10, and by monitoring and adjusting the output voltage and current of the photovoltaic panel, the stability and efficiency of the power system can be ensured. Figure 3

[0071] ​​Having described above several embodiments of the disclosure, any modifications and variations that fall within the scope of the described embodiments are also contemplated. It is also contemplated that the application covered by the claims extends to any alternative embodiment, adaptations, or variations of the various embodiments described above, and to any and all equivalents. The terms "comprises", "comprising", "comprised of" and "comprising" when used in this specification are taken to specify the presence of stated features, integers, steps or components but do not preclude the presence or addition of one or more other features, integers, steps, components or groups thereof.

Claims

1. A circuit breaker (10) characterized by, Comprising: an isolating switch (11) electrically connected between a positive input end (101) and a positive output end (102) of the circuit breaker (10) and / or electrically connected between a negative input end (103) and a negative output end (104) of the circuit breaker (10); a first voltage detection unit (12) electrically connected between the positive input end (101) and the negative input end (103), the first voltage detection unit (12) being capable of generating an enable signal in the case that an absolute value of an input voltage between the positive input end (101) and the negative input end (103) rises to be greater than a first voltage threshold value, wherein the first voltage threshold value is less than a rated voltage value of the circuit breaker (10); an energy storage tripping module (13) coupled to the isolating switch (11); and a power supply module (14) electrically connected to the first voltage detection unit (12) and the energy storage tripping module (13), the power supply module (14) being capable of supplying power to the energy storage tripping module (13) in the case that the enable signal is received. The power supply module (14) comprises:

2. The circuit breaker (10) of claim 1, characterized in that a main auxiliary power supply (141) electrically connected between the positive input end (101) and the negative input end (103), the main auxiliary power supply (141) being capable of converting a voltage between the positive input end (101) and the negative input end (103) into a first direct current voltage; and a voltage conversion circuit (142) electrically connected to the main auxiliary power supply (141), the first voltage detection unit (12) and the energy storage tripping module (13), the voltage conversion circuit (142) being capable of operating to convert the first direct current voltage into a second direct current voltage for supplying power to the energy storage tripping module (13) in the case that the enable signal is received. Further comprising:

3. The circuit breaker (10) of claim 2, characterized in that a solid state switch module (15) electrically connected between the isolating switch (11) and the positive output end (102); and a second voltage detection unit (16) electrically connected to both ends of the solid state switch module (15) to detect a voltage value between the both ends of the solid state switch module (15), and electrically connected to the energy storage tripping module (13), the second voltage detection unit (16) being capable of sending a first signal to the energy storage tripping module (13) in the case that an absolute value of the voltage value between the both ends of the solid state switch module (15) is greater than a second voltage threshold value, so as to cause the energy storage tripping module (13) to perform a tripping operation at least in the case that the first signal is received, the second voltage threshold value being greater than the rated voltage value. Further comprising: a third voltage detection unit (17) electrically connected to the energy storage tripping module (13) to detect an energy storage voltage value of the energy storage tripping module (13), and capable of sending a second signal to the energy storage tripping module (13) in the case that the energy storage voltage value is greater than a third voltage threshold value, so as to cause the energy storage tripping module (13) to perform a tripping operation in the case that the first signal and the second signal are received, the third voltage threshold value being greater than or equal to the second direct current voltage.

4. The circuit breaker (10) of claim 3, characterized in that Further comprising: ​ 5. The circuit breaker (10) of claim 3, wherein, ​ A control unit (18) is electrically connected to the second voltage detection unit (16) and the solid-state switch module (15), and the control unit (18) can control the solid-state switch module (15) to operate based on the absolute value of the voltage across the solid-state switch module (15).

6. The circuit breaker (10) of claim 5, characterized in that The control unit (18) is electrically connected to the voltage conversion circuit (142), and the control unit (18) can control the voltage conversion circuit (142) to operate so that the voltage conversion circuit (142) converts the first direct current voltage into a second direct current voltage for supplying power to the energy storage trip module (13).

7. The circuit breaker (10) according to any one of claims 3-6, characterized in that Further comprising: A voltage suppression module (191) is electrically connected across the solid-state switch module (15).

8. The circuit breaker (10) according to any one of claims 3-6, characterized in that The solid-state switch module (15) comprises: A first solid-state switch unit (151) whose drain electrode is electrically connected to the positive input terminal (101); and A second solid-state switch unit (152) whose drain electrode is electrically connected to the positive output terminal (102), and whose source electrode is electrically connected to the source electrode of the first solid-state switch unit (151).

9. The circuit breaker (10) according to any one of claims 3-6, characterized in that Further comprising: A surge current limiting unit (192) is electrically connected between the positive input terminal (101) and the solid-state switch module (15).

10. The circuit breaker (10) according to any one of claims 1-6, characterized in that Further comprising: A fourth voltage detection unit is electrically connected between the positive output terminal (102) and the negative output terminal (104) to detect the output voltage of the circuit breaker (10).

11. An electrical system, characterized by Comprising: The circuit breaker (10) according to any one of claims 1 to 10.

12. The electrical system of claim 11, wherein, Further comprising: A photovoltaic panel control circuit (20) is electrically connected to the positive output terminal (102) and the negative output terminal (104).

Images