CN116569297A

CN116569297A - Switching device, circuit breaker and power supply system

Info

Publication number: CN116569297A
Application number: CN202180007490.6A
Authority: CN
Inventors: 庄志坚; 王帅; 林晓斐; 徐臻
Original assignee: Huawei Digital Power Technologies Co Ltd
Current assignee: Huawei Digital Power Technologies Co Ltd
Priority date: 2021-11-03
Filing date: 2021-11-03
Publication date: 2023-08-08
Also published as: WO2023077319A1

Abstract

The embodiment of the application discloses a switching device, a circuit breaker and a power supply system, which can improve the switching performance of the circuit breaker. The circuit breaker comprises a first switching device, a second switching device and a control unit, wherein the first switching device is electrically connected between a direct current power supply and a load. The second switch is electrically connected between the direct-current power supply and the load, and the first switch device is connected with the second switch device in parallel. The control unit is electrically connected to the first switch device and the second switch device, and is configured to control states of the first switch and the second switch. Wherein one of the first switching device and the second switching device is a solid-state switching device, and the other is a mechanical switching device. By adopting the circuit breaker and the power supply system of the embodiment of the application, the faster short circuit breaking speed, lower conduction loss and lower cost can be realized.

Description

Switching device, circuit breaker and power supply system

Technical Field

The application relates to the electrical technical field, in particular to a switching device, a circuit breaker and a power supply system.

Background

At present, the power supply system is widely applied, and a breaker is often required to be used in the power supply system to realize the functions of control, protection and the like. For example, current new energy power generation technology is increasingly widely used, and when a short circuit fault occurs in a new energy power supply system, the new energy power supply system can instantaneously generate very large current, namely, the short circuit current rising rate is extremely fast. This may cause damage to the power supply load and even burn out the power supply system, thus requiring the circuit breaker to achieve an extremely fast off time.

The traditional circuit breaker needs a plurality of linkage devices in the switching process, such as springs, hooks, levers, armatures and the like, and has long linkage time, long switching action response time and low breaking speed. On the basis of conventional circuit breakers, the equipment volume may need to be made very large.

Disclosure of Invention

The embodiment of the application provides a switching device, a circuit breaker and a power supply system, and the embodiment of the application can realize extremely fast breaking speed and can also reduce the conduction loss of the switching device.

In a first aspect, embodiments of the present application provide a switching device, including: connection terminal, power module and drive module. The power module comprises a fixed contact and a moving contact, wherein the fixed contact is electrically connected to the connecting terminal, the switching device is conducted under the condition that the moving contact is contacted with the fixed contact, and the switching device is disconnected under the condition that the moving contact is disconnected with the fixed contact. The driving module comprises a repulsive force piece, a fixing frame and a coil, wherein the repulsive force piece is fixed on the fixing frame, the moving contact is fixed on the fixing frame, the coil is used for generating a magnetic field to generate repulsive force on the repulsive force piece, and the repulsive force piece drives the moving contact to move so as to drive the switching device to be disconnected.

By adopting the embodiment of the application, the repulsive force piece and the moving contact can be fixed on the fixed frame by the switching device, and the moving contact is driven to move by the repulsive force generated by the coil to the repulsive force piece, so that the switching device can be switched on and off. Such an implementation may enable extremely fast breaking speeds and may also reduce the conduction losses of the switching device.

In one possible design, the driving module further includes an electromagnet, where the electromagnet is configured to generate a driving force on the moving contact when energized, so as to drive the moving contact to contact with the fixed contact, and further drive the switching device to be turned on. Based on such design, the embodiment of the application can control through the driving force that the electro-magnet produced the moving contact with the stationary contact contacts, and then can control first switch switches on, simple structure and convenient control.

In one possible design, the driving module further includes a first yoke, a connection shaft, and a first permanent magnet, the first yoke is fixed at a first end of the connection shaft, and the connection shaft passes through the moving contact to be matched with the moving contact. When the moving contact is disconnected from the fixed contact, the first permanent magnet is used for generating magnetic force to the first magnetic yoke so as to keep the moving contact and the fixed contact in an disconnected state. Based on the design, when the movable contact and the fixed contact are disconnected, the first switch is ensured to be always in the disconnected state, and the stability of the switching device is improved.

In one possible design, the drive module further comprises a second yoke and a second permanent magnet, the second yoke being fixed to the second end of the connecting shaft. When the moving contact is in contact with the fixed contact, the second permanent magnet is used for generating magnetic force to the second magnetic yoke so as to keep the moving contact and the fixed contact in a contact state. Based on the design, when the moving contact is contacted with the fixed contact, the first switch is ensured to be in a conducting state all the time, and the stability of the switching device is improved.

In one possible design, the drive module further includes an elastic member located between the moving contact and the first yoke. The second permanent magnet is used for generating magnetic force to the second magnetic yoke so as to drive the connecting shaft to move, and the first magnetic yoke is used for propping against the elastic piece so that the elastic piece is elastically deformed to generate elastic force. Based on such design, stability of the switching device is improved.

In one possible design, the fixing frame is provided with a first annular groove, and the repulsive force piece is accommodated in the first annular groove. Based on such design, the embodiment of the application can be used for fixing the repulsive force piece and the fixing frame together, so that the on-off of the switching device can be realized.

In one possible design, an adhesive member is provided between the holder and the repulsive force member.

In one possible design, the fixing frame is further provided with a second annular groove, the first annular groove surrounds the second annular groove, the moving contact is accommodated in the second annular groove, and the fixing piece of the moving contact is fixed in the fixing hole of the fixing frame.

In a second aspect, embodiments of the present application also provide a circuit breaker comprising a switching device as described above. By adopting the circuit breaker in the embodiment of the application, extremely fast breaking speed can be realized, and the conduction loss of the switching device can be reduced.

In one possible design, the circuit breaker further comprises a control unit electrically connected to the switching device, the control unit being configured to control the state of the switching device. Based on the design, the embodiment of the application can control the on-off of the switching device through the control signal output by the control unit, so that the safety of a power supply system can be ensured.

In a third aspect, embodiments of the present application also provide a circuit breaker electrically connected between a dc power source and a load, the circuit breaker including a first switching device, a second switching device, and a control unit. The first switching device is electrically connected between the direct current power supply and the load. The second switching device is electrically connected between the direct-current power supply and the load, and the first switching device is connected in parallel with the second switching device. The control unit is electrically connected to the first switching device and the second switching device, and is configured to control states of the first switching device and the second switching device. Wherein one of the first switching device and the second switching device is a solid-state switching device, and the other is a mechanical switching device. By adopting the circuit breaker, one of the first switching device and the second switching device of the circuit breaker is a solid-state switching device, and the other is a mechanical switching device, so that the states of the first switching device and the second switching device can be controlled through the control unit. The circuit breaker in the embodiment of the application can be free of a linkage device, the control unit can control the on/off of the two switching devices, the corresponding time of the switching action is short, the circuit breaker can achieve extremely fast breaking speed, and the conduction loss of the switch is small.

In one possible design, the circuit breaker further includes a first driving unit and a second driving unit, the control unit is electrically connected to the first driving unit and the second driving unit, the first driving unit is used for controlling the state of the first switching device according to a first signal of the control unit, and the second driving unit is used for controlling the state of the second switching device according to a second signal of the control unit. Based on such a design, the control unit may control the states of the first switching device and the second switching device through the two driving units, and an extremely fast off time may be achieved.

In one possible design, the circuit breaker further comprises a third switching device electrically connected between the second switching device and the load, the third switching device being connected in series with the second switching device; the third switching device is used for forming an air gap for a loop of the second switching device after the second switching device is disconnected. Based on such design, the safety and stability of the circuit breaker can be improved.

In one possible design, the circuit breaker further includes a housing, the housing may include a bottom plate, a first side plate, a second side plate, and a first end plate, the first side plate and the second side plate are respectively connected to two sides of the bottom plate, the first end plate is connected to one end of the bottom plate, and the bottom plate, the first side plate, the second side plate, and the first end plate enclose an accommodating space together to accommodate the first switching device, the second switching device, the third switching device, the first driving unit, the second driving unit, and the control unit.

In one possible design, a display screen is provided on the second side plate, and the display screen is electrically connected to the control unit, and the display screen is used for configuring the protection threshold parameters of the circuit breaker. Based on such a design, the circuit breaker can set the action response time of the circuit breaker at different currents through a display screen.

In one possible design, the circuit breaker further includes a plurality of main contacts, each of the plurality of main contacts being electrically connected to the first switching device, the plurality of main contacts being pluggable to the dc power supply. Based on such design, the embodiment of the application can realize the plug between the breaker and the direct current power supply, and is convenient for the maintenance and replacement of devices.

In a fourth aspect, embodiments of the present application further provide a power supply system, where the power supply system includes a dc power supply, a load, and a circuit breaker as described above, where the circuit breaker is configured to disconnect the dc power supply from the load when the power supply system is shorted.

By adopting the switching device, the circuit breaker and the power supply system, ultra-fast breaking operation can be realized, welding lines between coils can be reduced, and fatigue fracture caused by back and forth movement of the welding lines of the moving coil is avoided. The circuit breaker and the power supply system provided by the embodiment of the application can realize faster short circuit breaking speed, lower conduction loss and lower cost.

Drawings

Fig. 1 is a schematic diagram of a circuit breaker according to an embodiment of the present application.

Fig. 2 is a schematic diagram of a power supply system according to an embodiment of the present application.

Fig. 3 is another schematic diagram of a power supply system according to an embodiment of the present application.

Fig. 4 is a schematic diagram of a circuit breaker according to an embodiment of the present application.

Fig. 5 is a schematic structural diagram of a circuit breaker according to an embodiment of the present application.

Fig. 6 is another schematic structural diagram of a circuit breaker according to an embodiment of the present application.

Fig. 7 is a power-on timing chart of the power supply system provided in the embodiment of the application.

Fig. 8 is a power-down timing chart of the power supply system provided in the embodiment of the application.

Fig. 9 is a schematic structural diagram of a first switching device according to an embodiment of the present application.

Fig. 10 is a schematic diagram illustrating the first switching device according to an embodiment of the present application.

Fig. 11 is a schematic structural view of a housing according to an embodiment of the present application.

Fig. 12 is another structural schematic view of the housing of the embodiment of the present application.

Fig. 13 is a schematic structural view of a repulsive force member and a fixing frame according to an embodiment of the present application.

Fig. 14 is another schematic structural view of the repulsive force member and the fixing frame according to the embodiment of the present application.

Fig. 15 is another schematic structural view of the repulsive force member and the fixing frame according to the embodiment of the present application.

Fig. 16 is a schematic structural view of a connection terminal of the embodiment of the present application.

Fig. 17 is a schematic structural diagram of a yoke and a connecting shaft according to an embodiment of the present application.

Fig. 18 is another schematic structural view of the yoke and the connecting shaft according to the embodiment of the present application.

Fig. 19 is a schematic structural view of a screw plate according to an embodiment of the present application.

Fig. 20 is a schematic structural view of a coil and a bracket according to an embodiment of the present application.

Fig. 21 is another schematic structural view of a coil and a bracket according to an embodiment of the present application.

Fig. 22 is a schematic structural view of a micro switch according to an embodiment of the present application.

Fig. 23 is a schematic cross-sectional view of a first switching device of an embodiment of the present application in an off state.

Fig. 24 is a schematic cross-sectional view of a first switching device of an embodiment of the present application in an on state.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all, of the embodiments of the present application.

In the embodiments of the present application, the terms "first," "second," and the like are used merely to distinguish between different objects, and are not to be construed as indicating or implying a relative importance, nor an order. For example, a first application, a second application, etc. are intended to distinguish between different applications, rather than to describe a particular order of application, and features defining "first", "second", etc. may explicitly or implicitly include one or more such features.

At present, the power supply system is widely applied, and a circuit breaker is often required to realize functions such as power distribution, protection and the like in the system. For example, a power supply system will generate a very large current rise rate and a very large current when a short-circuit fault occurs, and thus a circuit breaker is required to achieve a very fast turn-off time. It will be appreciated that the circuit breaker may be applied to a direct current power supply system or an alternating current power supply system, and refers to a switching device capable of switching on, carrying and off a current under normal loop conditions and switching on, carrying and off a current under abnormal loop conditions within a prescribed time. The circuit breaker has overload, short circuit and undervoltage protection functions, and has the capability of protecting lines and power supplies.

In one possible scenario, as shown in fig. 1, a circuit breaker may include a main contact 101, a snap 102, a connection shaft 103, a lever 104, an electromagnetic release 105, an armature 106, a coil 107, and a spring 108. One end of the hook 102 may be fixed to the connecting shaft 103, and when the current in the power circuit 109 changes instantaneously, the coil 107 connected in series in the power circuit 109 may generate a magnetic field to attract the armature 106. During the process of attracting the armature 106, the armature 106 impacts the lever 104 to disengage the hook 102, and at this time, the spring 108 can be restored from the stretched state, and the main contact 101 is pulled to realize the breaking function. The breaker has a plurality of linkage devices, such as a spring 108, a hook 102, a lever 104, an armature 106 and the like, in the breaking process, and the linkage time is relatively long. In addition, the breaking will generate electric arc, which has long burning time and affects the electrical life of the contact. For the reasons mentioned above, the circuit breaker in this kind of scene can only realize breaking time of millisecond (ms) level, and the speed of short circuit breaking is slower.

It is understood that an arc may refer to a gas ion generated in the contact gap that emits intense light and is electrically conductive when the mechanical circuit breaker is opened. The system circuit is not opened until the arc is extinguished and the contact gap becomes an insulating medium. Arcing time may refer to the time period during which the circuit breaker is arcing per phase during an opening process.

In another scenario, a circuit breaker may be turned on and off using an electronic power device instead of a switch, and the circuit breaker may achieve extremely fast turn-off time, but is limited by the current manufacturing process and material characteristics of the power electronic switch, and the circuit breaker in this scenario has a high turn-on loss and a generally low on-state current constant. In high current scenario applications, it is often necessary to use a liquid cooled radiator, resulting in increased volume and cost, system complexity, etc.

Aiming at the problems in the above scenes, the embodiment of the application provides a switching device, a circuit breaker and a power supply system, and the switching device, the circuit breaker and the power supply system in the embodiment of the application can realize faster short circuit breaking speed and lower conduction loss and are lower in cost.

Referring to fig. 2, fig. 2 is a schematic diagram of a power supply system 400 according to an embodiment of the present application. As shown in fig. 2, the power supply system 400 in the present embodiment may include a circuit breaker 100, a dc power source 200, and a load 300. The output terminal of the dc power supply 200 may be electrically connected to one terminal of the circuit breaker 100, and the other terminal of the circuit breaker 100 may be electrically connected to the load 300.

In some possible implementations, the dc power source 200 may be a power battery (e.g., nickel-cadmium battery, nickel-hydrogen battery, lithium ion battery, lithium polymer battery, etc.), or a storage battery, etc.

Optionally, the DC power supply 200 may be further electrically connected to a primary circuit such as an AC/DC converter (Alternating Current/Direct-Current converter) or other DC/DC converter (e.g., BUCK converter, BOOST converter, BUCK-BOOST converter, etc.). In other words, the dc power supply 200 may be a direct power supply or an indirect power supply that is transmitted through a circuit.

In some possible implementations, the load 300 may be a photovoltaic inverter, an electric car, other DC/DC converter or DC/AC converter (Direct-Current/Alternating Current converter), or the like.

In one possible scenario, the circuit breaker 100 may disconnect the dc power source 200 from the load 300 when the power supply system 400 is shorted. In the embodiment of the application, the circuit breaker 100 utilizes the extremely fast short-circuit current breaking capacity and the arc-free breaking characteristic of the power electronic power device to realize the arc extinction in the breaking process, and the circuit breaker 100 utilizes the low loss and low temperature rise of the mechanical contact with extremely low conduction loss characteristic to realize the closing state, so that the power electronic switch has long service life and good reliability. It will be appreciated that the short circuit breaking capability may refer to the highest current value that the circuit breaker is capable of breaking without being damaged.

Referring to fig. 3, fig. 3 is a schematic diagram of a power supply system 400 according to another embodiment of the present application. As shown in fig. 3, the circuit breaker 100 in the present embodiment may be electrically connected between the dc power source 200 and the load 300.

The circuit breaker 100 may include a first switching device 10, a second switching device 20, a third switching device 30, a first driving unit 40, a second driving unit 50, and a control unit 60. The first switching device 10 and the second switching device 20 are connected in parallel. The second switching device 20 and the third switching device 30 are connected in series. A first terminal of the first switching device 10 may be electrically connected to the dc power supply 200, a second terminal of the first switching device 10 may be electrically connected to the load 300, and a third terminal of the first switching device 10 may be electrically connected to the first driving unit 40. A first end of the second switching device 20 may be electrically connected to the dc power supply 200, a second end of the second switching device 20 may be electrically connected to a first end of the third switching device 30, and a third end of the second switching device 20 may be electrically connected to the second driving unit 50. The first driving unit 40 and the second driving unit 50 are electrically connected to the control unit 60.

It will be appreciated that in one possible implementation, the second switching device 20 may be one of an insulated Gate bipolar transistor (Insulated Gate Bipolar Transistor, IGBT), a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), or an Integrated Gate Commutated Thyristor (IGCT).

It is understood that the third terminal of the second switching device 20 is the control terminal of the second switching device 20. A second terminal of the third switching device 30 may be electrically connected to the load 300, a third terminal of the third switching device 30 may receive the control signal of the control unit 60, and a third terminal of the third switching device 30 may be a control terminal of the third switching device 30. It will be appreciated that in one possible implementation, the first driving unit 40 may control the state of the first switching device 10 according to the signal output by the control unit 60, and the second driving unit 50 may control the state of the second switching device 20 according to the signal output by the control unit 60. It will be appreciated that one of the first switching device 10 and the second switching device 20 is a solid state switching device and the other is a mechanical switching device. For example, in one scenario, the first switching device 10 may be a mechanical switching device and the second switching device 20 may be a solid state switching device. The third switching device 30 has an auxiliary switching node, and the control unit 60 may detect the state of the third switching device 30. For example, the control unit 60 may detect that the third switching device 30 is turned off or on. It will be appreciated that in the embodiment of the present application, the second switching device 20 may achieve the effect of no fox opening, and the first switching device may achieve low power consumption of the system.

It will be appreciated that in one scenario, after the control unit 60 controls the third switching device 30 to be turned on, the second driving unit 50 controls the second switching device 20 to be turned on again. In another scenario, after the second driving unit 50 controls the second switching device 20 to be turned off, the control unit 60 may control the third switching device 30 to be turned off again. The third switching device 30 may be configured to form an air gap for the loop of the second switching device 20 after the second switching device 20 is turned off.

For example, in one scenario, when the power supply system 400 is powered up, i.e. when the power supply system 400 starts to supply power to the load 300, the control unit 60 may control the third switching device 30 to be turned on, then the second driving unit 50 may control the second switching device 20 to be turned on, at this time, the control unit 60 may further detect the current between the dc power supply 200 and the load 300, and may determine whether the current between the dc power supply 200 and the load 300 is normal. If the control unit 60 determines that the current between the dc power source 200 and the load 300 is normal, for example, because the current of the power supply system 400 is less than the first threshold value or because the current rising rate di/dt of the power supply system 400 is less than the second threshold value for a continuous period of time δt, the control unit 60 outputs a signal to the first driving unit 40 to control the first switching device 10 to be turned on. If the control unit 60 determines that the current between the dc power source 200 and the load 300 is abnormal, for example, the current between the dc power source 200 and the load 300 is greater than a first threshold value or the current rising rate di/dt is greater than a second threshold value for a continuous period of time δt due to a short circuit of the power supply system 400, the control unit 60 outputs a signal to the second driving unit 50 to control the second switching device 20 to be turned off.

For example, in one scenario, when the power supply system 400 is already operating, i.e. the power supply system 400 is already supplying power to the load 300, the first switching device 10, the second switching device 20, and the third switching device 30 are all in a closed state. If the power supply system 400 is shorted, the control unit 60 determines that the current or the current rising rate between the dc power supply 200 and the load 300 is abnormal, for example, when the current between the dc power supply 200 and the load 300 is greater than a first threshold value or the current rising rate di/dt is greater than a second threshold value for a continuous period δt due to the shorted power supply system 400, the control unit 60 outputs a signal to the first driving unit 40 to control the first switching device 10 to be turned off. When the control unit 60 has not detected the current on the loop where the first switching device 10 is located, the control unit 60 outputs a signal to the second driving unit 50 to control the second switching device 20 to be disconnected, thereby disconnecting the power supply system 400 from the load 300. After the second switching device 20 is turned off, the control unit 60 controls the third switching device 30 to be turned off to achieve mechanical breakpoint isolation of the power supply system 400 from the load 300.

In one possible scenario, if the power supply system 400 fails, that is, the power supply system 400 needs to perform a trip process, the control unit 60 may analyze the failure type of the power supply system 400 and perform a corresponding process. The control unit 60 may determine the type of fault of the power supply system 400 according to the detected current.

The fault handling of the power supply system 400 by the circuit breaker 100 will be exemplified below.

1) The fault type is lightning strike and the control unit 60 does not switch the switch.

2) The fault type is a short circuit, the control unit 60 controls the first switching device 10 to be opened, and then the control unit 60 will also continue to confirm whether the first switching device 10 has been completely opened. If the first switching device 10 has been turned off, the control unit 60 further controls the second switching device 20 to be turned off. Thereby, the circuit breaker 100 may protect the power supply system 400.

3) The fault type is overload, the control unit 60 confirms whether the detected current is greater than a threshold value in a first time, and if the detected current is greater than the threshold value in the first time, the control unit 60 controls the first switching device 10 to be turned off. The control unit 60 will also continue to confirm whether the first switching device 10 has been fully opened. If the first switching device 10 has been turned off, the control unit 60 further controls the second switching device 20 to be turned off. Thereby, the circuit breaker 100 may protect the power supply system 400.

Referring to fig. 4, fig. 4 is a schematic diagram of a circuit breaker 100 according to another embodiment of the present application. The circuit breaker 100 in this embodiment may confirm the type of fault of the power supply system 400 according to the detected current.

Specifically, a coil 21 (shown in fig. 5) is connected between the dc power supply 200 and a connection terminal 11 (shown in fig. 3), wherein in one possible implementation, the connection terminal 11 may be a copper bar, the first switching device 10 is connected between the connection terminal 11 and the load 300, a first end of the second switching device 20 is connected between the coil 21 and the connection terminal 11, and a second end of the second switching device 20 is connected to the load 300.

In one embodiment, the control unit 60 may connect two terminals of the connection terminal 11 to detect a voltage between the two terminals, and may further obtain a current Isense of a loop in which the first switching device 10 is located, so as to determine whether the power supply system 200 is overloaded according to the current Isense.

In one embodiment, the coil may be a rogowski coil, which may be used to determine whether the power supply system 400 is struck by lightning or shorted. Still further, the control unit 60 may detect the current change rate di/dt of the power supply system 400 through the coil, and confirm the type of fault according to the current change rate di/dt and the duration of the power supply system 400.

The circuit breaker provided in the embodiment of the present application will be illustrated below with reference to the accompanying drawings and practical application scenarios.

Referring to fig. 5 and 6, fig. 5 and 6 are schematic structural diagrams of a circuit breaker 100 according to an embodiment of the present application.

In this embodiment, the circuit breaker 100 may include a first switching device 10, a first driving unit 40, a control unit 60, and a housing 70.

Specifically, the housing 70 may include a bottom plate 71, a first side plate 72, a second side plate 73, and a first end plate 74. Wherein the first side plate 72 and the second side plate 73 may be connected to both sides of the bottom plate 71, respectively, and the first end plate 74 may be connected to a first end of the bottom plate 71. In this embodiment, the bottom plate 71, the first side plate 72, the second side plate 73, and the first end plate 74 may jointly enclose an accommodating space 75 to accommodate the first switching device 10, the second switching device 20, the third switching device 30, the first driving unit 40, the second driving unit 50, and the control unit 60. The first driving unit 40 may be fixed to the first end plate 74.

It will be appreciated that in other possible implementations, the housing 70 may further include a top cover and a second end plate (not shown). The second end plate may be connected to the second end of the bottom plate 71, the second end plate may be further connected to the first side plate 72 and the second side plate 73, and the top cover may be connected to the first side plate 72, the second side plate 73 and the second end plate.

In this embodiment, the circuit breaker 100 may further include a plurality of main contacts 80, each of the main contacts 80 may be electrically connected to the connection terminal 11 of the first switching device 10, and the coil 21 may be sleeved on the connection terminal 11, where the coil 21 may be a rogowski coil. It will be appreciated that a plurality of openings 721 may be provided in the first side plate 72, and the plurality of openings 721 may be in one-to-one correspondence with the plurality of main contacts 80. Thus, each of the main contacts 80 may be connected to an external device through the opening 721. The plurality of main contacts 80 are connected to the dc power supply 200 in a pluggable manner, that is, the main contacts 80 can realize the plugging between the circuit breaker 100 and the power supply system 400, so as to facilitate the maintenance and replacement of devices.

In one embodiment, the connection terminal 11 may be provided with an end point 113 and an end point 114, and the end point 113 and the end point 114 may be electrically connected to the control unit 60. It will be appreciated that the control unit 60 may detect the current Isense of the loop in which the first switching device 10 is located by detecting the voltages at terminal 113 and terminal 114.

The second side plate 73 may be provided with a display screen 76, and the display screen 76 may be electrically connected to the control unit 60. The control unit 60 may detect an operation parameter of the power supply system 400, such as a current or voltage between the dc power supply 200 and the load 300, and transmit the detected parameter to the display screen 76, whereby the display screen 76 may display the operation parameter of the entire power supply system 400 in real time. The control unit 60 may also transmit opening or closing information of the circuit breaker 100 to the display screen 76, so as to control the display screen 76 to display the opening or closing state of the circuit breaker 100 in real time. Still further, the display screen 76 may enable protection threshold and time settings for the circuit breaker 100, i.e., may be set at different currents, for the action response time of the circuit breaker 100.

In one embodiment, the circuit breaker 100 may further include a circuit board 90. Wherein the second switching device 20, the third switching device 30, and the second driving unit 50 may be integrated on the circuit board 90, and the control unit 60 may be electrically connected to the second driving unit 50.

It will be appreciated that the first side plate 72 may further be provided with a connector 722, and the connector 722 is configured to receive an instruction from an external device, so that the state of the circuit breaker 100 may be remotely controlled, for example, the external device may remotely control the circuit breaker 100 to be turned on or off. The connector 722 may also be used to power a control portion of the circuit breaker 100. Still further, the external device may communicate with the control unit 60 through the connector 722 to acquire information of the circuit breaker 100.

In one possible implementation, the circuit breaker 100 may further include a power converter (not shown in the drawing) electrically connected to the dc power source 200, and converting a first voltage outputted from the dc power source 200 into a second voltage, and the second voltage may be provided to the control unit 60, the first driving unit 40, and the second driving unit 50 to supply power.

Referring to fig. 7, fig. 7 shows a power-up timing diagram of the power supply system 400 of fig. 3.

It will be appreciated that the closing signal shown in fig. 7 may be a signal output by the external device to the control unit 60, the solid-state switching signal may be a signal output by the control unit 60 to the second driving unit 50, the mechanical switching signal may be a signal output by the control unit 60 to the first driving unit 40, the solid-state switching state may be a state of the second switching device 20, and the mechanical switching state may be a state of the first switching device 10.

As shown in fig. 7, at time t0, the control unit 60 receives a closing signal of the external device. At time t1, the control unit 60 sends a solid state switching signal of high level to the second driving unit 50. At time t2, the second driving unit 50 controls the state of the second switching device 20, i.e., the second switching device 20 is switched from the off state to the on state. At time t3, the control unit 60 outputs a high-level mechanical switching signal to the first driving unit 40. At time t4, the first driving unit 40 controls the state of the first switching device 10, i.e., the first switching device 10 is switched from the off state to the on state. At this time, the first switching device 10 and the second switching device 20 are both in an on state. At time t5, the external device no longer outputs a closing signal to the control unit 60.

Referring to fig. 8, fig. 8 shows a power-down timing diagram of the power supply system 400 of fig. 3.

It will be appreciated that the opening signal shown in fig. 8 may be a signal output from the external device to the control unit 60.

As shown in fig. 8, at time t0, the control unit 60 receives a switching-off signal of the external device. At time t1, the control unit 60 sends a high-level mechanical switching signal to the first driving unit 40. At time t2, the first driving unit 40 controls the state of the first switching device 10, i.e., the first switching device 10 is switched from the on state to the off state. At time t3, the control unit 60 outputs a solid-state switching signal of low level to the second driving unit 50. At time t4, the second driving unit 50 controls the state of the second switching device 20, i.e., the second switching device 20 is switched from the on state to the off state. At this time, both the first switching device 10 and the second switching device 20 are in an off state. At time t5, the external device no longer outputs a brake-off signal to the control unit 60.

Further, the structure of the first switching device 10 of the embodiment of the present application will be described with reference to the drawings.

Referring to fig. 9, fig. 9 is a schematic structural diagram of a first switching device 10 according to an embodiment of the present application. As shown in fig. 9, the first switching device 10 may include a connection terminal 11 and a housing 14. It will be appreciated that the connection terminal 11 may be a main power supply line in an electrical device, the connection terminal 11 may have a large current flow capacity, and the connection terminal 11 may comprise a copper bar or an aluminum bar.

The housing 14 may include an upper cover 141, a middle frame 142, and a lower cover 143. The upper cover 141 may be abutted against the top of the middle frame 142, and the lower cover 143 may be abutted against the bottom of the middle frame 142.

As shown in fig. 10 and 11, the circuit breaker 100 may further include a power module 12 and the driving module 13.

The connection terminals 11, the power module 12, and the driving module 13 may be accommodated in the housing 14. Specifically, the middle frame 142 may be provided with a receiving space 1423, so that at least a portion of the power module 12 and the driving module 13 may be received in the receiving space 1423.

Still further, in one possible implementation manner, the power module 12 in the embodiment of the present application may include a moving contact 121 and a fixed contact 122, where the fixed contact 122 is electrically connected to the connection terminal 11, and the moving contact 121 may be moved.

It will be appreciated that in one scenario, for example, in the case where the moving contact 121 and the fixed contact 122 are in contact, the first switching device 10 is turned on. In another scenario, for example, in the case where the moving contact 121 and the fixed contact 122 are opened, the first switching device 10 is opened. Alternatively, the moving contact 121 and the fixed contact 122 may also be collectively referred to as a moving contact system.

Alternatively, in one embodiment, the connection terminal 11 may include a first connection terminal 111 and a second connection terminal 112, and the fixed contact 122 may include a first fixed contact 123 and a second fixed contact 124. The first fixed contact 123 may be connected to the first connection terminal 111, and the second fixed contact 124 may be connected to the second connection terminal 112. The first stationary contact 123 and the second stationary contact 124 are in an electrically disconnected state.

Therefore, when the fixed contact 122 and the movable contact 121 are opened, the first connection terminal 111 and the second connection terminal 112 are in an opened state, that is, the first switching device 10 is in an opened state. When the fixed contact 122 and the moving contact 121 are in contact, the moving contact 121 may connect the first fixed contact 123 and the second fixed contact 124, so as to provide a low-resistance path between the first connection terminal 111 and the second connection terminal 112, so that the first connection terminal 111 and the second connection terminal 112 are electrically connected, that is, the first switching device 10 is in a conductive state.

In some examples, the fixed contact 122 and the connection terminal 11 may be an integrated structure, or in other words, the fixed contact 122 may be a part of the connection terminal 11.

In one possible implementation, the drive module 13 may include a permanent magnet 131, a permanent magnet 132, an elastic member 133, a repulsive member 134, a coil 135, and an electromagnet 136.

In some embodiments, the permanent magnet 131 may be fixed to the lower cover 143. In particular, in the implementation of the present application, the driving module 13 may further include a sleeve 137, and the permanent magnet 131 may be disposed in the sleeve 137. Alternatively, an adhesive member may be provided between the sleeve 137 and the permanent magnet 131. Thereby, the permanent magnet 131 and the sleeve 137 may be fixedly connected together by means of glue. Further, the lower cover 143 is provided with a receiving portion 1431, and the sleeve 137 may be received in the receiving portion 1431. Optionally, a through hole 1432 may be further formed in the lower cover 143, and a fixing hole corresponding to the through hole 1432 may be formed at the bottom of the sleeve 137. Accordingly, the embodiment of the present application may fix the sleeve 137 to the lower cover 143 by fixing the fixing member in the fixing hole of the sleeve 137 through the through hole 1432. It will be appreciated that in one possible implementation, the fixing hole of the sleeve 137 may be a screw hole, and the fixing member may be a screw.

Referring to fig. 12 to 15, the lower cover 143 may further have a through hole 1435, and the bottom of the middle frame 142 may further have a fixing hole 1425 corresponding to the through hole 1435. Accordingly, the embodiment of the present application may be fixed in the fixing hole 1425 by passing a fixing member through the through hole 1435, and thus the lower cover 143 may be fixed at the bottom of the middle frame 142.

It will be appreciated that, in one embodiment, the lower cover 143 may further be provided with a boss 1433 and a boss 1434, the two bosses 1433 may be located at two ends of the accommodating portion 1431, the first connection terminal 111 is provided with a through hole corresponding to the boss 1433, and the second connection terminal 112 is provided with a through hole corresponding to the boss 1434. Thereby, the boss 1433 and the boss 1434 can be respectively mated with the through hole of the first connection terminal 111 and the through hole of the second connection terminal 112.

It will be appreciated that in one possible implementation, the inner side and the outer side of the first stationary contact 123 and the second stationary contact 124 may be coated with an insulating paint, thereby performing an insulating function. Alternatively, the material of the insulating varnish may be epoxy resin.

As shown in fig. 16, the first stationary contact 123 and the second stationary contact 124 may jointly enclose an accommodating space 125, and the sleeve 137 and the permanent magnet 131 may be both located in the accommodating space 125.

In one embodiment, the driving module 13 may further include a yoke 138, a yoke 139, and a connection shaft 1310.

As shown in fig. 17 and 18, the yoke 138 and the yoke 139 may be configured to provide a certain holding force when the first switching device 10 is turned on or off. Specifically, the yoke 138 in the present embodiment may be adsorbed on the permanent magnet 131. The yoke 138 may include a body portion 1381 and an extension 1382, and the extension 1382 may be fixedly connected to the body portion 1381. The connection shaft 1310 may include a first step 1311, a second step 1312, and a connection 1313. The first step 1311 is fixedly connected to the second step 1312, and the second step 1312 is fixedly connected to the connecting portion 1313. Wherein the second step 1312 is located between the first step 1311 and the connection 1313. In one possible implementation, each of the first step 1311, the second step 1312, and the connection 1313 may have a circular shape, the diameter of the first step 1311 is larger than the diameter of the second step 1312, and the diameter of the connection 1313 is smaller than the diameter of the second step 1312.

Further, the first stepped portion 1311 may be provided with a fixing hole 1314, the extension portion 1382 may be fixed in the fixing hole 1314 of the connection shaft 1310, and the body portion 1381 may be adsorbed on the permanent magnet 131. In one embodiment, the securing hole 1314 may have internal threads disposed therein. The connection portion 1313 may be provided with external threads.

The yoke 139 may include a body portion 1391 and an extension portion 1392, and the body portion 1391 may be fixedly connected to the extension portion 1392. It will be appreciated that in one embodiment, the yoke 139 may also be provided with a fixing hole 1393. The fixing hole 1393 may penetrate through the body portion 1391 and the extension portion 1392. The connection portion 1313 of the connection shaft 1310 may be fixed in the fixing hole 1393, and the body portion 1391 may be adsorbed on the permanent magnet 132.

It will be appreciated that in one possible implementation, the moving contact 121 may be sleeved on the connection shaft 1310. Specifically, the moving contact 121 may be provided with a through hole 1211, the diameter of the through hole 1211 is smaller than the diameter of the first step portion 1311, and the diameter of the through hole 1211 is larger than the diameter of the second step portion 1312, so that both the second step portion 1312 and the connection portion 1313 may pass through the through hole 1211 of the moving contact 121, and the first step portion 1311 may not pass through the through hole 1211 of the moving contact 121, so that the moving contact 121 may be sleeved on the second step portion 1312.

In one possible implementation, the elastic member 133 may be sleeved on the connection shaft 1310, and the elastic member 133 may be located between the moving contact 121 and the yoke 139. Alternatively, the elastic member 133 may be a spring. After the movable contact 121 is connected with the first fixed contact 123 and the second fixed contact 124, the elastic member 133 will be further compressed for a certain length under the action of the permanent magnet 131. It will be appreciated that the permanent magnet 131 generates a magnetic force on the yoke 138, so as to drive the connecting shaft to move, and the yoke 139 will press against the elastic member 133, so that the elastic member 133 is elastically deformed to generate an elastic force.

In one embodiment, the first switching device 10 may further include a fixing frame 15, and the fixing frame 15 may be used to fix the repulsive force piece 134. The moving contact is fixed on the fixed frame 15. Specifically, the fixing frame 15 is provided with an annular groove 151, and the repulsive member 134 may be accommodated in the annular groove 151. Alternatively, an adhesive member may be disposed between the fixing frame 15 and the repulsive force member 134. That is, the fixing frame 15 and the repulsive force piece 134 may be fixedly connected together by means of adhesive.

Alternatively, the repulsive force piece 134 may be made of copper, aluminum, or aluminum alloy. To increase the efficiency of the repulsive force member 134, the surface thereof may also be typically silver plated.

In one possible implementation, a second annular groove 152 may be further provided in the middle of the fixing frame 15, and the annular groove 151 may surround the annular groove 152. The moving contact 121 may be accommodated in the annular groove 152.

Referring to fig. 15 again, the fixing frame 15 may further be provided with a through slot 154 and a fixing hole 155, the connecting shaft 1310, the elastic member 133 and the magnetic yoke 139 may be accommodated in the through slot 154, and the extension portion 1392 of the magnetic yoke 139 may be leaked from the fixing frame 15.

The movable contact 121 may be provided with a rivet 1212 corresponding to the fixing hole 155, and the rivet 1212 may be fixed in the fixing hole 155.

As shown in fig. 19, in one possible embodiment, the driving module 13 may further include a threaded disc 17, where the threaded disc 17 in this embodiment may be used to limit and guide the electromagnet 136. Specifically, the screw plate 17 may be provided with a through hole 171 and a through hole 172, the through hole 171 and the through hole 172 may be communicated, and the permanent magnet 132 may be accommodated in the through hole 172. In one embodiment, the permanent magnet 132 may be provided with a through hole (not shown), wherein the through hole of the permanent magnet 132 may communicate with between the through hole 171 and the through hole 172.

As shown in fig. 20 and 21, in one possible implementation, the driving module 13 may further include a support 16, where the support 16 may be provided with an annular cavity 161, and the coil 135 may be accommodated in the annular cavity 161. It will be appreciated that in one embodiment, the bracket 16 and the coil 135 may be sleeved on the stationary contact 122. The bracket 16 and the coil 135 may be positioned between the repulsive member 134 and the lower cover 143. The bracket 16 may further be provided with a through hole 162, and the stationary contact 122 may pass through the through hole 162.

In some embodiments, the annular cavity 161 and the coil 135 may have a gap therebetween. The gap between the annular cavity 161 and the coil 135 may be filled with an insulating material, which may be a silicone, an epoxy, or the like.

Alternatively, the coil 135 may be made of copper or aluminum. In one possible implementation, the coil 135 may be discharged by an external capacitor to generate a magnetic field, and the repulsive force member 134 may induce a magnetic field opposite to the coil 135. Based on such design, the repulsive force piece 134 may be fixed on the fixing frame 15, the moving contact may be fixed on the fixing frame 15, and the coil 135 may generate a repulsive force on the repulsive force piece 134, so that the repulsive force piece may drive the moving contact 121 to move, and further drive the first switching device 10 to be turned off.

Alternatively, the support 16 may be made of a soft magnetic material such as ferrite, electrical pure iron, silicon steel sheet, amorphous ribbon, or a non-magnetically permeable material such as plastic, stainless steel, or the like.

The electromagnet 136 may include a body portion 1361 and a shaft 1362, the shaft 1362 being slidably coupled to the body portion 1361. Wherein a first end of the moving shaft 1362 may interface with the through hole of the permanent magnet 132, the through hole 171, and the through hole 172. That is, when the electromagnet 136 is energized, the first end of the moving shaft 1362 may sequentially pass through the through hole of the permanent magnet 132, the through hole 171, and the through hole 172, so as to generate a pressure on the yoke 139 and the elastic member 133, and thus may drive the moving contact 121 to approach the fixed contact 122, thereby enabling the fixed contact 122 and the moving contact 121 to contact, and thus enabling the first switching device 10 to be turned on.

The top of the body 1361 is provided with a fixing hole (not shown), the upper cover 141 may include a housing portion 1411 and a body 1416, the housing portion 1411 may be fixedly connected to the body 1416, the housing portion 1411 may be provided with a housing space 1415, and the housing space 1415 may be used to house the electromagnet 136. The receiving portion 1411 may be provided with a through hole 1412 corresponding to the fixing hole of the body portion 1361. The first switching device 10 may further include a fixing member 1413. Based on such a design, the fixing member 1413 may be fixed in the fixing hole of the body portion 1361 through the through hole 1412, thereby fixing the electromagnet 136 to the upper cover 141. Further, the accommodating portion 1411 may further be provided with a through hole 1414, and when the electromagnet 136 is accommodated in the accommodating space 1415 of the accommodating portion 1411, the second end of the moving shaft 1362 may leak from the position of the through hole 1414 to the upper cover 141.

Still further, a fixing hole 1422 may be further formed at the top of the middle frame 142, and a through hole 1419 corresponding to the fixing hole 1422 may be formed in the body 1416, so that the embodiment of the present application may be fixed in the fixing hole 1422 by passing a fixing member through the through hole 1419, thereby fixing the upper cover 141 at the top of the middle frame 142.

Wherein, the screw thread disc 17 may be provided with screw threads, and the accommodating portion 1411 may be provided with screw threads matching the screw thread disc 17, so that the screw thread disc 17 may be rotated into the upper cover 141, and the screw threads on the screw thread disc 17 may be matched with the screw threads in the accommodating portion 1411, so as to fix the screw thread disc 17 on the upper cover 141.

As shown in fig. 22, in one possible implementation, the first switching device 10 may further include a micro switch 18 and a fixing member 181. The micro-switch 18 may be used to sense the state of the first switching device 10 and may feed back the state of the first switching device 10 to the control unit 60. The micro switch 18 may be fixed to the upper cover 141. It will be appreciated that referring again to fig. 12, the bottom of the body 1416 may be provided with an extension 1417, and the extension 1417 may be provided with a fixing hole 1418.

The micro switch 18 is provided with a through hole 182 corresponding to the fixing hole 1418, and the fixing member 181 may pass through the through hole 182, so as to be fixed in the fixing hole 1418, thereby fixing the micro switch 18 at a position below the upper cover 141.

It will be appreciated that in one embodiment, the fixing member 181 may be a screw, and the fixing hole 1418 may be a screw hole. The bottom of the micro switch 18 is also provided with a sensing part 183. It will be appreciated that when the repulsive force member 134 drives the fixing frame 15 to move upward, the fixing frame 15 will press against the sensing portion 183, at this time, the micro switch 18 will output a first sensing signal to the control unit 60, and when the repulsive force member 134 drives the fixing frame 15 to move downward, the sensing portion 183 will not be pressed against, at this time, the micro switch 18 will output a second sensing signal to the control unit 60. Thus, the micro switch 18 may output a sensing signal to the control unit 60 according to whether the sensing part 183 is pressed, so as to indicate the opening or closing state.

Referring to fig. 23, fig. 23 is a schematic diagram of the first switching device 10 in the open state in the embodiment of the present application.

As shown in fig. 23, when the first switching device 10 needs to be switched on, the electromagnet 136 may obtain power from an external power source, so that after the moving contact 121 may move from the switching-off position to the contact just-on position after separating from the permanent magnet 131, the yoke 139 and the permanent magnet 132 have a certain air gap, and the elastic member 133 is continuously compressed under the action of the permanent magnet force until the yoke 138 and the permanent magnet 131 are completely contacted, so as to be kept at the switching-on position. That is, when the moving contact is in contact with the fixed contact, the permanent magnet 131 generates a magnetic force to the yoke 138 to maintain the moving contact in contact with the fixed contact. At this time, the electromagnet 136 may be powered down, and the closing force provided by the permanent magnet 131 is greater than the force value of the elastic member 133 after compression.

Referring to fig. 24, fig. 24 is a schematic diagram illustrating the first switching device 10 in a closed state in the embodiment of the present application.

As shown in fig. 24, when the first switching device 10 needs to be disconnected, the coil 135 may be discharged through an external capacitor, and at this time, the repulsive force member 134 may induce a current and a magnetic field opposite to those of the coil 135, so as to form a repulsive force, so as to complete the quick separation of the moving contact 121 and the fixed contact 122, and when the moving contact and the fixed contact reach the disconnected position, the permanent magnet 132 provides a disconnected holding force, so as to keep the disconnected position. That is, when the moving contact is disconnected from the fixed contact, the permanent magnet 132 will generate a magnetic force to the yoke 139 to maintain the moving contact in an open state with the fixed contact.

By adopting the embodiment of the application, ultra-fast breaking operation can be realized, welding lines between coils can be reduced, and fatigue fracture caused by back and forth movement of the welding lines of the moving coils due to the adoption of a double-coil scheme is avoided. In addition, the embodiment of the application has no positive and negative polarity requirements on the outgoing lines of the coils 135 and the electromagnets 136, can realize foolproof wiring, is simple in wiring and has no possibility of error. The circuit breaker and the power supply system provided by the embodiment of the application can realize faster short circuit breaking speed, lower conduction loss and lower cost.

It will be appreciated by persons skilled in the art that the above embodiments are provided for illustration only and not as limitations of the present application, and that suitable modifications and variations of the above embodiments are within the scope of the application as claimed.

Claims

A switching device, comprising:

a connection terminal;

the power module comprises a fixed contact and a moving contact, wherein the fixed contact is electrically connected to the connecting terminal, the switching device is conducted under the condition that the moving contact is contacted with the fixed contact, and the switching device is disconnected under the condition that the moving contact is disconnected with the fixed contact;

The driving module comprises a repulsive force piece, a fixing frame and a coil, wherein the repulsive force piece is fixed on the fixing frame, the moving contact is fixed on the fixing frame, the coil is used for generating a magnetic field to generate repulsive force on the repulsive force piece, and the repulsive force piece drives the moving contact to move so as to drive the switching device to be disconnected.
The switching device according to claim 1, wherein,

the driving module further comprises an electromagnet, and the electromagnet is used for generating driving force for the moving contact when the electromagnet is electrified so as to drive the moving contact to be in contact with the fixed contact and further drive the switching device to be conducted.
Switching device according to claim 1 or 2, characterized in that,

the driving module further comprises a first magnetic yoke, a connecting shaft and a first permanent magnet, wherein the first magnetic yoke is fixed at the first end of the connecting shaft, and the connecting shaft penetrates through the moving contact to be matched with the moving contact;

when the moving contact is disconnected from the fixed contact, the first permanent magnet is used for generating magnetic force to the first magnetic yoke so as to keep the moving contact and the fixed contact in an disconnected state.
A switching device according to claim 3, wherein,

The driving module further comprises a second magnetic yoke and a second permanent magnet, and the second magnetic yoke is fixed at the second end of the connecting shaft;

when the moving contact is in contact with the fixed contact, the second permanent magnet is used for generating magnetic force to the second magnetic yoke so as to keep the moving contact and the fixed contact in a contact state.
The switching device according to claim 4, wherein,

the driving module further comprises an elastic piece, wherein the elastic piece is positioned between the moving contact and the first magnetic yoke; the second permanent magnet is used for generating magnetic force to the second magnetic yoke so as to drive the connecting shaft to move, and the first magnetic yoke is used for propping against the elastic piece so that the elastic piece is elastically deformed to generate elastic force.
A switching device according to any one of claims 1 to 5, wherein,

the fixing frame is provided with a first annular groove, and the repulsive force piece is accommodated in the first annular groove.
A switching device according to any one of claims 1-6, wherein an adhesive member is provided between the holder and the repulsive force member.
The switching device according to claim 6, wherein,

The fixed frame is also provided with a second annular groove, the first annular groove surrounds the second annular groove, the moving contact is accommodated in the second annular groove, and the fixing piece of the moving contact is fixed in the fixing hole of the fixed frame.
A circuit breaker, characterized in that it comprises a switching device according to any one of claims 1-8.
The circuit breaker according to claim 9, wherein,

the circuit breaker further comprises a control unit, wherein the control unit is electrically connected to the switching device and is used for controlling the state of the switching device.
A circuit breaker electrically connected between a direct current power supply and a load, characterized in that the circuit breaker comprises a first switching device, a second switching device and a control unit;

the first switching device is electrically connected between the direct-current power supply and the load;

the second switching device is electrically connected between the direct-current power supply and the load, and the first switching device is connected in parallel with the second switching device;

the control unit is electrically connected to the first switching device and the second switching device, and is configured to control states of the first switching device and the second switching device;

Wherein one of the first switching device and the second switching device is a solid-state switching device, and the other is a mechanical switching device.
The circuit breaker according to claim 11, wherein,

the circuit breaker further comprises a first driving unit and a second driving unit, the control unit is electrically connected to the first driving unit and the second driving unit, the first driving unit is used for controlling the state of the first switching device according to a first signal of the control unit, and the second driving unit is used for controlling the state of the second switching device according to a second signal of the control unit.
The circuit breaker according to claim 11 or 12, characterized in that,

the circuit breaker further comprises a third switching device electrically connected between the second switching device and the load, the third switching device being connected in series with the second switching device; the third switching device is used for forming an air gap for a loop of the second switching device after the second switching device is disconnected.
The circuit breaker according to claim 13, wherein,

the circuit breaker still includes the shell, the shell can include bottom plate, first curb plate, second curb plate and first terminal plate, first curb plate with the second curb plate connect respectively in the both sides of bottom plate, first terminal plate connect in the one end of bottom plate, first curb plate, second curb plate and first terminal plate enclose into accommodation space jointly, in order to accept first switching device second switching device third switching device first drive unit second drive unit with the control unit.
The circuit breaker according to any one of claims 11 to 14, characterized in that,

the circuit breaker further comprises a plurality of main contacts, wherein the main contacts are electrically connected to the first switching device, and the main contacts are connected to the direct-current power supply in a pluggable manner.
A power supply system comprising a dc power source, a load and a circuit breaker according to any one of claims 9 to 15 for disconnecting the dc power source from the load when the power supply system is shorted.