Switching device and power system

Abstract

The utility model provides a switching device and a power system. The switch device comprises a switch body and a detection driving module, the switch body comprises an igniter, a piston and a through-flow row, and the piston is used for cutting off the through-flow row under driving of impact force generated when the igniter explodes. The detection driving module comprises an insulating shell and a tunnel magnetoresistance effect sensor, the through-flow bar is located outside the insulating shell, the magnetic sensor is contained in the insulating shell, and the magnetic sensor is used for detecting the magnetic field intensity generated when current flows through the through-flow bar. The igniter is used for exploding when the magnetic field intensity is larger than or equal to a threshold value. A detection driving module is adopted to detect the magnetic field intensity generated when current flows through a through-flow row, when the magnetic field intensity is larger than or equal to a threshold value, the detection driving module triggers an igniter to explode, a piston cuts off the through-flow row under the driving of impact force generated when the igniter explodes, and then a loop with a short-circuit fault is cut off; and the current breaking precision of the switching device can be improved.

Description

Technical Field

[0001] The present application relates to the field of power distribution technology, and in particular to a switch device and a power system. Background Art

[0002] In one power-off scheme, the fuse and the copper busbar are connected in series in the same circuit. The fuse is responsible for short-circuit fault detection. When the power circuit flows through the short-circuit fault current, if the melting condition is reached, the fuse will be thermally melted and a voltage will be generated at both ends of the fuse to drive the ignition device to ignite. When the ignition device explodes, it drives the piston to break the copper busbar and isolate the faulty line. However, the current value range of the fuse is large, and the breaking current cannot be accurately controlled. Utility Model Content

[0003] Embodiments of the present application provide a switch device and a power system capable of improving the accuracy of breaking current.

[0004] In a first aspect, an embodiment of the present application provides a switch device, the switch device comprising a switch body and a detection drive module, the switch body comprising an igniter, a piston and a flow bar, the piston being used to cut off the flow bar under the driving of the impact force generated when the igniter explodes. The detection drive module comprises an insulating housing and a tunnel magnetoresistance effect sensor, the flow bar is located outside the insulating housing, the magnetic sensor is accommodated in the insulating housing, and the magnetic sensor is used to detect the magnetic field strength generated when current flows through the flow bar. The igniter is used to explode when the magnetic field strength is greater than or equal to a threshold value.

[0005] When electric current passes through a conductor, a magnetic field is generated around the conductor. The greater the current, the greater the magnetic field strength.

[0006] The switch device provided by the present application uses a magnetic sensor of a detection drive module to detect the magnetic field strength generated when current flows through the current busbar. If a short circuit occurs in the power circuit where the switch device is located, the current in the current busbar will increase rapidly, and the magnetic field strength will also increase with the increase of the current. When the magnetic field strength is greater than or equal to the threshold, the ignition device explodes, and the piston is driven by the impact force generated by the explosion of the ignition device to cut off the current busbar, thereby disconnecting the circuit where the short circuit occurs. Compared with the method of triggering the ignition device by fusing a fuse, the magnetic field strength generated when current flows through the current busbar is detected by a magnetic sensor. As long as the magnetic field strength is greater than or equal to the threshold, the ignition device explodes and drives the piston to cut off the current busbar. This is conducive to improving the accuracy of the switch device in breaking the current.

[0007] In addition, since no fuse is connected in series in the power circuit, it is helpful to reduce the internal resistance of the switching device.

[0008] In addition, since the through-current busbar is located outside the insulating housing and the magnetic sensor is accommodated in the insulating housing, the through-current busbar does not need to pass through the magnetic sensor and the insulating housing, which is beneficial to reducing the volume of the detection and driving module.

[0009] According to the first aspect, in a possible implementation manner, the detection driving module includes a circuit board, the circuit board is accommodated in an insulating housing, and the tunnel magnetoresistance effect sensor is disposed on the circuit board and electrically connected to the circuit board.

[0010] In this possible implementation, the circuit board is used to carry the magnetic sensor, which facilitates the assembly of the magnetic sensor in the insulating housing.

[0011] According to the first aspect, in a possible implementation, the insulating housing includes a main housing and a cover body, the circuit board is accommodated in the main housing, the main housing is detachably connected to the switch body, and the cover body is disposed on one end of the main housing.

[0012] In this possible implementation, the cover is provided at one end of the main shell, and the cover and the main shell form a closed inner cavity to protect the circuit board and the magnetic sensor and other devices on the circuit board. The insulating shell includes the main shell and the cover which are separately provided, which facilitates the assembly and disassembly of the detection drive module. The main shell is detachably connected to the switch body, which facilitates the removal of the detection drive module from the switch body for replacement or maintenance.

[0013] According to the first aspect, in a possible implementation, the switch device further includes an electromagnetic shielding cover, and a portion of the through-current bar is passed through the electromagnetic shielding cover. One end of the insulating shell is accommodated in the electromagnetic shielding cover. Along the direction perpendicular to the arrangement direction of the detection drive module and the through-current bar, the orthographic projection of the tunnel magnetic sensor is located on the electromagnetic shielding cover.

[0014] In this possible implementation, the positive projection of the magnetic sensor is located on the electromagnetic shielding cover along the direction perpendicular to the arrangement direction of the detection drive module and the current bus, that is, the electromagnetic shielding cover is arranged outside the magnetic sensor, and the electromagnetic shielding cover is used to shield electromagnetic interference outside the electromagnetic shielding cover to improve the stability of the magnetic field generated when current flows through the current bus in the electromagnetic shielding cover, thereby improving the detection accuracy of the magnetic sensor.

[0015] According to the first aspect, in a possible implementation, the electromagnetic shielding cover includes a first part, a second part and a third part which are connected to each other, the first part and the third part are arranged opposite to each other, the current-through bus is located between the first part and the third part, and the current-through bus is located between the second part and the insulating shell.

[0016] In this possible implementation, the first part and the third part are arranged opposite to each other, and the second part is connected between the first part and the third part, that is, the electromagnetic shielding cover has a groove-shaped structure, which is simple and convenient for manufacturing the electromagnetic shielding cover.

[0017] According to the first aspect, in a possible implementation, a first receiving groove and a second receiving groove are provided on the outer wall of the insulating housing, the first receiving groove is arranged opposite to the second receiving groove, the first part is received in the first receiving groove and fixedly connected to the inner wall of the first receiving groove, and the third part is received in the second receiving groove and fixedly connected to the inner wall of the second receiving groove. According to the first aspect, in a possible implementation, the detection drive module and the through-current bar are arranged along a first direction, the through-current bar extends along a second direction to transmit current, and the first direction is perpendicular to the second direction.

[0018] In this possible implementation, the detection drive module and the current bus are arranged along a first direction, and the current bus is used to transmit current along a second direction to improve the accuracy of the detection drive module in detecting the magnetic field strength and improve the simplicity of the layout of the switch device.

[0019] According to the first aspect, in a possible implementation manner, the magnetic sensor is disposed at an end of the circuit board located in the first direction and close to the through-current bar.

[0020] In this possible implementation, the magnetic sensor is disposed at one end of the circuit board located in the first direction and close to the through-current bar, so as to improve the sensing accuracy of the magnetic sensor.

[0021] According to the first aspect, in a possible implementation manner, the magnetic sensor includes a tunneling magnetoresistance effect detection sensor.

[0022] In this possible implementation, the tunnel magnetoresistance effect (TMR) detection sensor, TMR element has better temperature stability, higher sensitivity, lower power consumption, better linearity than Hall element, and does not require an additional magnetic ring structure; TMR element has better temperature stability, higher sensitivity, wider linear range than AMR element, and does not require an additional set / reset coil structure; TMR element has better temperature stability, higher sensitivity, lower power consumption, and wider linear range than GMR element. The use of TMR sensor is conducive to improving the accuracy of the detection drive module in detecting the magnetic field strength.

[0023] According to the first aspect, in a possible implementation, the switch body also includes a shell component, the shell component includes a first sub-shell and a second sub-shell, the first sub-shell, the flow row and the second sub-shell are stacked in sequence, the ignition device and the piston are both accommodated in the first sub-shell, and the insulating shell is connected to the first sub-shell.

[0024] In this possible implementation, the housing component adopts a first sub-shell and a second sub-shell that are separately arranged, which facilitates the assembly of the switch device.

[0025] According to the first aspect, in a possible implementation manner, the through-hole is provided in the through-hole, the through-hole is located outside the housing component, and the first part passes through the through-hole.

[0026] In this possible implementation, the second part passes through the through hole, and the through hole can limit the electromagnetic shielding cover to improve the position stability of the electromagnetic shielding cover.

[0027] In a second aspect, the embodiment of the present application further provides a power system, the power system comprising a controller and the switch device described in the first aspect, the controller being used to be electrically connected to the ignition device of the switch device to trigger the ignition device to ignite and explode. According to the second aspect, in a possible implementation, the power system comprises one of a power distribution device, an electric vehicle, a photovoltaic inverter, and an energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of a power system provided in accordance with an embodiment of the present application;

[0029] Figure 2 A schematic diagram of a switch device provided in one embodiment of the present application being applied to a photovoltaic inverter system;

[0030] Figure 3 A schematic structural diagram of an example of an energy storage system having a switch device provided by the present application is shown;

[0031] Figure 4 A schematic structural diagram of an example of a power system of an electric vehicle having a switch device provided by the present application is shown;

[0032] Figure 5 A schematic structural diagram of an example of a power distribution device having a switch device provided by the present application is shown;

[0033] Figure 6 A three-dimensional schematic diagram of a switch device provided in one embodiment of the present application;

[0034] Figure 7 For along Figure 6 The three-dimensional cross-sectional view obtained along line II shown;

[0035] Figure 8 for Figure 6 A perspective exploded schematic diagram of the switch device shown;

[0036] Fig. 9 A three-dimensional schematic diagram of a detection drive module;

[0037] Fig.10 The three-dimensional exploded diagram of the detection drive module;

[0038] Fig.11 A three-dimensional schematic diagram of an electromagnetic shielding cover.

[0039] Description of reference numerals:

[0040] 100-switch device; 200-controller; 101-switch body; 10-shell component; 12-first sub-shell; 122-first sub-chamber; 126-mounting hole; 14-second sub-shell; 142-second sub-chamber; 20-through-flow row; 22-conductor; 223-through hole; 24-insulator; 50-ignition tool; 60-piston; 103-detection drive module; 71-circuit board; 73-magnetic sensor; 75-insulating shell; 751-main shell; 7511-first receiving groove; 753-cover; 77-electromagnetic shielding cover; 771-first part; 773-second part; 775-third part; Z-first direction; X-second direction; Y-third direction. DETAILED DESCRIPTION

[0041] The technical solution in this application will be described below in conjunction with the accompanying drawings.

[0042] See also Figure 1 The power system includes a switch device 100 and a controller 200. The switch device 100 is used to connect with a device or equipment such as a load to form a circuit. The switch device 100 is used to disconnect the circuit when an abnormality occurs in the circuit. The controller 200 is used to control the switch device 100 to cut off the power supply to the circuit.

[0043] The controller 200 may include one or more processors, and the processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor, etc., and the controller 200 may be the control center of the power system. It is understood that the controller 200 may be provided separately from the switch device 100, or the controller 200 may be integrated in the switch device 100.

[0044] The switch device 100 of the present application can be effectively applied to a power system having a high voltage circuit, such as Figure 1As shown, the power system may also include a high voltage power supply, one end of the switch device 100 is connected to the high voltage power supply, and the other end is connected to the load. In addition, the switch device 100 of the present application may also be used in a power system having a low voltage circuit.

[0045] For example, the power system may include a photovoltaic inverter system, Figure 2 FIG. 1 is a schematic structural diagram of an example of a photovoltaic inverter system having a switch device 100 provided in the present application. Figure 2 As shown, the photovoltaic inverter system includes a photovoltaic (PV) module and a photovoltaic inverter. The photovoltaic module is used to convert solar energy into electrical energy. The photovoltaic module includes a plurality of photovoltaic panels. Since the photovoltaic module generates direct current, it is necessary to convert the direct current into alternating current through a photovoltaic inverter to facilitate the transmission and utilization of electricity.

[0046] The photovoltaic inverter includes a direct current to alternating current (DC / AC) converter, and the DC / AC converter is used to convert direct current into alternating current.

[0047] The photovoltaic inverter also includes a maximum power point tracking (MPPT) device. The MPPT circuit device is used to track the highest voltage and current values ​​so that the power generation system outputs current at the maximum power.

[0048] The MPPT circuit device and the DC / DC module in the photovoltaic inverter can be arranged in the same package device or in different package devices.

[0049] The MPPT circuit device may include a direct current to direct current (DC / DC) converter, which is used to stabilize the direct current generated by the photovoltaic module (or, voltage conversion processing). The DC power after voltage stabilization can be output to the power energy storage system. One end A of the DC / AC converter is connected to the MPPT circuit device and an energy storage system, and the other end B is used to connect to the AC power grid or AC load, so that the DC / AC converter converts the DC power output by the MPPT circuit device or the energy storage system into AC power, and provides it to the AC load or the AC power grid.

[0050] like Figure 2As shown, in one implementation, the switch device 100 provided in the present application can be arranged in a circuit between the MPPT circuit device and the energy storage system and the DC / AC converter, that is, one end of the switch device 100 is connected to the MPPT circuit device and the energy storage system, and one end of the switch device 100 is connected to the DC / AC converter. In this case, the switch device 100 operates in a DC circuit. The switch device 100 can be used to cut off the electrical connection between the MPPT circuit device and the DC / AC converter, and the switch device 100 can be used to cut off the electrical connection between the energy storage system and the DC / AC converter.

[0051] In another implementation, the switch device 100 provided in the present application can be arranged between the DC / AC converter and the output interface of the photovoltaic system, that is, the switch device 100 can cut off the electrical connection between the DC / AC converter and the AC load or the AC grid. In this case, the switch device 100 works in the AC circuit. The switch device 100 can be used to cut off the electrical connection between the photovoltaic system and the AC load or the AC grid.

[0052] The switch device 100 provided in the present application may also be provided in the above-mentioned photovoltaic inverter. In this case, the photovoltaic inverter includes the above-mentioned DC / AC converter, the MPPT circuit device, the detection circuit, and the switch device 100.

[0053] The input end of the MPPT circuit device is used to connect to the photovoltaic module, and the output end of the MPPT circuit device is used to directly or indirectly connect to the input end of the DC / AC converter.

[0054] For example, the switch device 100 is connected between the output end of the MPPT circuit device and the input end of the DC / AC converter.

[0055] Alternatively, the switch device 100 is connected between the output end of the DC / AC converter and an external power grid or a load.

[0056] For example, the power system may include an energy storage system, Figure 3 FIG. 1 is a schematic structural diagram of an example of an energy storage system having a switch device 100 provided in the present application. Figure 3As shown, the switching device 100 may operate in a DC circuit. The energy storage system includes one or more battery clusters, each of which includes one or more battery packs, the battery cluster includes an input interface and an output interface, an output interface for outputting DC power to the load, and an input interface for inputting DC power output from the photovoltaic inverter system. The switching device 100 provided in the present application may be arranged between the input interface and the photovoltaic inverter system, and the switching device 100 may be used to cut off the electrical connection between the energy storage system and the load. The switching device 100 provided in the present application may be disposed between the output interface and the load, and the switching device 100 may be used to cut off the electrical connection between the energy storage system and the load.

[0057] In addition, although not shown in the figure, the energy storage system may also include one or more DC / DC converters and one or more battery management systems (BMS). Each battery pack corresponds to a BMS. BMS is usually used to implement dynamic monitoring of battery charging and discharging, battery balancing, and evaluation of battery charge state, and the DC / DC converter is used for power conversion included in the battery.

[0058] The battery pack may be a single battery or a battery cluster consisting of multiple batteries. Specifically, the battery may be a combination of one or more of a lead-carbon battery, a lithium iron phosphate battery, a ternary lithium battery, a sodium sulfur battery, and a flow battery.

[0059] For example, the power system may include electric vehicles, Figure 4 FIG. 1 is a schematic structural diagram of an example of a power system of an electric vehicle having a switch device 100 provided in the present application. Figure 4 As shown, the electric vehicle includes a power battery and an electric drive system. The power battery includes a battery cluster, and the battery cluster includes one or more battery packs connected in series. The electric drive system includes an inverter circuit and a motor. The output port of the battery cluster provides direct current to the inverter circuit, and the inverter circuit converts the direct current into three-phase alternating current and transmits it to the motor, thereby driving the motor.

[0060] In one implementation, the switch device 100 provided in the present application may be disposed in a circuit between a battery cluster and an inverter circuit. In this case, the switch device 100 operates in a DC circuit. The switch device 100 may be used to cut off the electrical connection between the battery cluster and the electric drive system.

[0061] In another implementation, the switching device 100 provided by the present application can be arranged in a circuit between the inverter circuit and the motor, that is, the switching device 100 can cut off the electrical connection between the inverter circuit and the motor, that is, one end of the switching device 100 is connected to the AC busbar of the inverter circuit, and the other end of the switching device 100 is connected to the motor. In this case, the switching device 100 operates in the AC circuit. The switching device 100 may be used to cut off the electrical connection between the inverter circuit and the motor.

[0062] In one implementation, Figure 5 As shown, Figure 5 A schematic structural diagram is shown for an example of a power distribution device with a switch device 100 provided by the present application. The power system may include a power distribution device, ie, a switch device 100 is applied to a power distribution device, and the power distribution device is used to connect between the power grid and the load. The power distribution equipment includes an alternating current to dc (AC / DC) converter and a switching device 100 , which is used to convert the alternating current transmitted from the power grid into direct current. The switching device 100 is connected between the AC / DC converter and the load, that is, the power grid, the load, the AC / DC converter and the switching device 100 form a success rate loop. The switching device 100 is used to disconnect or turn on the electrical connection between the AC / DC converter and the load. For example, the power distribution equipment may be a low-voltage power distribution cabinet.

[0063] In a power-off solution, the flow discharge of the fuse and the switching device are connected in series in a power circuit. The fuse is responsible for short-circuit fault detection. When the power circuit flows through a short-circuit fault current, if the fuse condition is reached, the fuse will be hot-fed and a voltage drive ignition device will be generated at both ends of the fuse. When the ignition device explodes, the piston drives the movement to interrupt the flow discharge and achieves the partition of the faulty line. The current value range of fuse blowing is large, and the breaking current cannot be accurately controlled.

[0064] Based on this, see Figure 6 In one embodiment of the present application, a switch device 100 is provided. The switch device 100 includes a switch body 101 and a detection and driving module 103. Figure 7 , the switch body 101 includes a flow discharge line 20 , an ignition tool 50 , and a piston 60 . The piston 60 is used to cut off the flow discharge 20 under the driving force generated when the ignition tool 50 explodes. The detection drive module 103 includes a magnetic sensor 73 and an insulating housing 75 . The flow row 20 is located outside the insulating housing 75 , and the magnetic sensor 73 is housed in the insulating housing 75 , and the magnetic sensor 73 is used to detect the magnetic field strength generated when the flow row 20 flows through the current. The ignition tool 50 explodes when the magnetic field strength is greater than or equal to the threshold. In this embodiment, the ignition tool 50 can be electrically connected to the controller 200, which is (eg Figure 1 As shown in FIG. 1 , the ignition device 50 may be used to obtain the magnetic field strength fed back by the magnetic sensor 73 and trigger the explosion of the ignition device 50 when the magnetic field strength is greater than or equal to a threshold value.

[0065] When electric current passes through a conductor, a magnetic field is generated around the conductor. The greater the current, the greater the magnetic field strength.

[0066] The switching device 100 provided in this application uses the magnetic sensor 73 of the detection drive module 103 to detect the magnetic field strength generated by the current flowing through the current. If the power circuit where the switching device 100 is located causes a short circuit fault, the current in the current flowing through the current will increase at an extreme speed, and the magnetic field strength will also increase with the increase of the current. When the magnetic field strength is greater than or equal to the threshold, the detection drive module 103 triggers the ignition gear 50 to explode, and the piston 60 cuts off the vent 20 under the impact force generated by the ignition gear 50 to explode, thereby breaking the power circuit that causes the short circuit fault. Compared with the method of triggering the ignition device by fuse fuse, the magnetic sensor 73 detects the magnetic field strength generated when the current flows through the flow row 20. As long as the magnetic field strength is greater than or equal to the threshold, the ignition device 50, that is, the explosion driving piston 60, cuts off the flow row 20. In this way, it is beneficial to improve the accuracy of the switching device 100 to cut off the current.

[0067] In addition, the current bus 20 is located outside the insulating shell 75, and the magnetic sensor 73 is accommodated in the insulating shell 75. The current bus 20 does not need to pass through the magnetic sensor 73 and the insulating shell 75, which is beneficial to reducing the volume of the detection and driving module 103 and improving the flexibility of the layout of the detection and driving module 103 and the current bus 20.

[0068] In addition, since no fuse is connected in series in the power circuit where the switch device 100 is located, it is beneficial to reduce the internal resistance of the switch device 100.

[0069] In some embodiments of the present application, the housing component 10 includes a first sub-shell 12 and a second sub-shell 14, and the first sub-shell 12, the through-current row 20, and the second sub-shell 14 are stacked in sequence along a first direction Z. The through-current row 20 is located between the first sub-shell 12 and the second sub-shell 14. The housing component 10 uses the first sub-shell 12 and the second sub-shell 14 that are separately arranged, which facilitates the assembly of the switch device 100.

[0070] The first sub-shell 12 is provided with a first sub-chamber 122 for accommodating the piston 60. The piston 60 is accommodated in the first sub-chamber 122 before the through-flow drain 20 is cut off. An end of the first sub-shell 12 away from the second sub-shell 14 is provided with a mounting hole 126 connected to the first sub-chamber 122 for accommodating and installing the igniter 50.

[0071] The second sub-shell 14 is provided with a second sub-chamber 142 for accommodating the piston 60. The piston 60 enters the second sub-chamber 142 after cutting off the through-flow row 20. The present application does not limit the housing component 10 to include the first sub-shell 12 and the second sub-shell 14. For example, the second sub-shell 14 can be omitted.

[0072] The current-through bar 20 includes a conductor 22 and an insulator 24 coated on the conductor 22. The conductor 22 is used for current flow. The first sub-shell 12, the insulator 24, and the second sub-shell 14 are stacked along the first direction Z. In some embodiments of the present application, the conductor 22 is passed through the insulator 24 along the second direction X and fits with the insulator 24. It can be understood that the current-through bar 20 can omit the insulator 24 and directly pass through the shell component 10.

[0073] The igniter 50 is installed in the mounting hole 126. The igniter 50 can be electrically connected to the detection drive module 103. The igniter 50 is a general term for disposable components and devices that are filled with gunpowder or explosives and burn or explode after being stimulated by external stimuli to ignite the gunpowder, detonate the explosives or perform mechanical work.

[0074] In some embodiments of the present application, the detection drive module 103 is located outside the switch body 101. The detection drive module 103 is decoupled from the switch body 101, and the detection drive module 103 can be set outside the switch as an independent accessory, with a simple structure, and can be selected as needed, which increases the flexibility of product configuration.

[0075] In some embodiments of the present application, the detection driving module 103 and the through-current bar 20 are arranged along the first direction Z, and the through-current bar 20 extends along the second direction X for transmitting current, and the second direction X is perpendicular to the first direction Z, so as to improve the accuracy of the detection driving module 103 in detecting the magnetic field strength and improve the simplicity of the layout of the switch device 100. The width direction of the through-current bar 20 is the third direction Y. The first direction Z is perpendicular to the third direction Y, and the second direction X is perpendicular to the third direction Y.

[0076] It can be understood that the present application does not limit the detection driving module 103 and the current-carrying bar 20 to be stacked along the first direction Z, and the present application does not limit the transmission direction of the current in the current-carrying bar 20. The current-carrying bar 20 only needs to be able to transmit the current, and the transmission direction of the current in the current-carrying bar 20 may not be perpendicular to the arrangement direction of the detection driving module 103 and the current-carrying bar 20. The detection driving module 103 only needs to be able to detect the magnetic field strength generated when the current flows through the current-carrying bar 20.

[0077] In some embodiments of this application, please refer to Figure 7 , Figure 8 , Fig. 9 and Fig.10The detection driving module 103 further includes a circuit board 71. The magnetic sensor 73 is disposed on the circuit board 71. The magnetic sensor 73 is disposed at one end of the circuit board 71 located in the first direction Z and close to the through-current row 20 to improve the sensing accuracy of the magnetic sensor 73. Figure 1 As shown) can also be set on the circuit board 71.

[0078] In this embodiment, the magnetic sensor 73 is a tunnel magnetoresistance (TMR) sensor. The TMR element is a new type of magnetoresistance sensor that has been industrially applied in recent years. It uses the tunnel magnetoresistance effect of magnetic multilayer film materials to sense the magnetic field. It has a larger resistance change rate than the anisotropic magnetoresistance (AMR) element and the giant magnetores istance (GMR) element that have been discovered and applied before. The magnetic tunnel junction (MTJ) is usually used to refer to the TMR element. Compared with the Hall element, the TMR element has better temperature stability, higher sensitivity, lower power consumption, better linearity, and does not require an additional magnetic ring structure; the TMR element has better temperature stability, higher sensitivity, and a wider linear range than the AMR element, and does not require an additional set / reset coil structure; the TMR element has better temperature stability, higher sensitivity, lower power consumption, and a wider linear range than the GMR element. The use of the TMR sensor is conducive to improving the accuracy of the detection drive module 103 in detecting the magnetic field strength.

[0079] It can be understood that the present application does not limit the magnetic sensor 73 to a TMR sensor. For example, the magnetic sensor 73 can be a GMR element or an AMR element. The circuit board 71 is accommodated in the insulating housing 75, and the insulating housing 75 is connected to the first sub-shell 12. The insulating housing 75 is used to protect the circuit board 71 and the components on the circuit board 71. The insulating housing 75 includes a main housing 751 and a cover 753. The main housing 751 is detachably connected to the first sub-shell 12, and the main housing 751 is used to accommodate the circuit board 71. The cover 753 is covered at one end of the insulating housing 75, and the cover 753 and the main housing 751 form a closed inner cavity to protect the circuit board 71 and the components such as the magnetic sensor 73 on the circuit board 71. The insulating housing 75 includes a main housing 751 and a cover 753 that are separately arranged, which facilitates the assembly and disassembly of the detection and driving module 103. The main housing 751 is detachably connected to the first sub-shell 12, which facilitates the removal of the detection and driving module 103 from the switch body 101 for replacement or maintenance.

[0080] The switch device 100 further includes an electromagnetic shielding cover 77, a portion of the conductor 22 is passed through the electromagnetic shielding cover 77, and at least a portion of the main shell 751 and the magnetic sensor 73 are accommodated in the electromagnetic shielding cover 77. The electromagnetic shielding cover 77 is used to shield electromagnetic interference outside the electromagnetic shielding cover 77, so as to improve the stability of the magnetic field generated when the current flows through the current-carrying bar 20 in the electromagnetic shielding cover 77, and improve the detection accuracy of the magnetic sensor 73.

[0081] See also Figure 7 and Fig.11 The electromagnetic shielding cover 77 includes a first part 771, a second part 773 and a third part 775 which are connected in sequence. The first part 771 and the third part 775 are arranged opposite to each other. The through-current bar 20 is located between the first part 771 and the third part 775. The through-current bar 20 is located between the second part 773 and the insulating shell 75. The first part 771 and the third part 775 are arranged opposite to each other. The second part 773 is connected between the first part 771 and the third part 775. That is, the electromagnetic shielding cover 77 has a groove-shaped structure, which is simple in structure and convenient for manufacturing the electromagnetic shielding cover 77.

[0082] In this embodiment, a first receiving groove 7511 (such as Fig. 9 and Fig.10 The first receiving groove 7511 and the second receiving groove 7513 are arranged opposite to each other, the first part 771 is received in the first receiving groove 7511 and fixedly connected to the inner wall of the first receiving groove 7511, and the third part 775 is received in the second receiving groove and fixedly connected to the inner wall of the second receiving groove. During assembly, the first receiving groove 7511 can position the first part 771, and the second receiving groove can position the third part 775, which facilitates the assembly between the electromagnetic shielding cover 77 and the insulating shell 75.

[0083] The through-hole 223 (such as Figure 8 The through hole 223 is located outside the housing component 10, through which the second part 773 passes. The through hole 223 can limit the electromagnetic shielding cover 77 and improve the position stability of the electromagnetic shielding cover 77.

[0084] It should be understood that expressions such as "including" and "may include" that may be used in the present application indicate the existence of the disclosed functions, operations, or constituent elements, and do not limit one or more additional functions, operations, and constituent elements. In the present application, terms such as "including" and / or "having" may be interpreted as indicating specific characteristics, numbers, operations, constituent elements, components, or combinations thereof, but may not be interpreted as excluding the existence or possibility of adding one or more other characteristics, numbers, operations, constituent elements, components, or combinations thereof.

[0085] In addition, in the present application, the expression "and / or" includes any and all combinations of the associated listed words. For example, the expression "A and / or B" may include A, may include B, or may include both A and B.

[0086] In the present application, expressions including ordinal numbers such as "first" and "second" may modify various elements. However, such elements are not limited by the above expressions. For example, the above expressions do not limit the order and / or importance of the elements. The above expressions are only used to distinguish one element from other elements. For example, a first user device and a second user device indicate different user devices, although the first user device and the second user device are both user devices. Similarly, without departing from the scope of the present application, a first element may be referred to as a second element, and similarly, a second element may also be referred to as a first element.

[0087] When a component is referred to as being "connected" or "accessed" to another component, it should be understood that the component is not only directly connected to or accessed to the other component, but also another component may exist between the component and the other component. On the other hand, when a component is referred to as being "directly connected" or "directly accessed" to another component, it should be understood that there is no component between them.

[0088] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A switch device, characterized in that: The switch device comprises a switch body and a detection drive module, wherein the switch body comprises an igniter, a piston and a flow row, wherein the piston is used to cut off the flow row under the driving of the impact force generated when the igniter explodes; The detection and driving module includes an insulating shell and a magnetic sensor, the current-carrying bar is located outside the insulating shell, the magnetic sensor is accommodated in the insulating shell, and the magnetic sensor is used to detect the magnetic field strength generated when the current flows through the current-carrying bar; The ignition tool is used for exploding when the magnetic field strength is greater than or equal to a threshold value.

2. The switch device according to claim 1, characterized in that: The detection driving module further includes a circuit board, which is accommodated in the insulating housing. The magnetic sensor is disposed on the circuit board and is electrically connected to the circuit board.

3. The switch device according to claim 2, characterized in that: The insulating shell comprises a main shell and a cover body, the circuit board is accommodated in the main shell, the main shell is detachably connected to the switch body, and the cover body is covered at one end of the main shell.

4. The switch device according to claim 2, characterized in that: The switch device further comprises an electromagnetic shielding cover, a portion of the current-passing bar is passed through the electromagnetic shielding cover, and one end of the insulating shell is accommodated in the electromagnetic shielding cover; Along a direction perpendicular to the arrangement direction of the detection driving module and the through-current bars, the orthographic projection of the magnetic sensor is located on the electromagnetic shielding cover.

5. The switch device according to claim 4, characterized in that: The electromagnetic shielding cover comprises a first part, a second part and a third part which are connected to each other. The first part and the third part are arranged opposite to each other. The current-through bus is located between the first part and the third part, and the current-through bus is located between the second part and the insulating shell.

6. The switch device according to claim 5, characterized in that: A first receiving groove and a second receiving groove are provided on the outer wall of the insulating shell, the first receiving groove is arranged opposite to the second receiving groove, the first part is received in the first receiving groove and fixedly connected to the inner wall of the first receiving groove, and the third part is received in the second receiving groove and fixedly connected to the inner wall of the second receiving groove.

7. The switch device according to claim 2, characterized in that: The detection driving module and the current-carrying bar are arranged along a first direction, the current-carrying bar extends along a second direction to transmit current, and the first direction is perpendicular to the second direction.

8. The switch device according to claim 7, characterized in that: The magnetic sensor is arranged at one end of the circuit board located in the first direction and close to the through-current bar.

9. The switch device according to any one of claims 2 to 8, characterized in that: The magnetic sensor includes a tunneling magnetoresistance effect detection sensor.

10. The switch device according to claim 1, characterized in that The switch body also includes a shell component, which includes a first sub-shell and a second sub-shell. The first sub-shell, the through-flow row and the second sub-shell are stacked in sequence. The igniter and the piston are both accommodated in the first sub-shell. The insulating shell is connected to the first sub-shell.

11. The switch device according to claim 10, characterized in that: The switch device further comprises an electromagnetic shielding cover, the through-current bar is provided with a through hole, the through hole is located outside the housing component, and the second part of the electromagnetic shielding cover passes through the through hole.

12. A power system, characterized in that: The power system comprises a controller and a switch device according to any one of claims 1 to 11, wherein the controller is used to be electrically connected to an ignition device of the switch device to trigger the ignition device to ignite and explode.

13. The power system according to claim 12, characterized in that: The power system includes one of a power distribution device, an electric vehicle, a photovoltaic inverter, and an energy storage system.

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