Power-off apparatus and power system

Abstract

Embodiments of this application provide a power-off apparatus and a power system. The power-off apparatus includes an open / close conductive strip, an interrupt piston, and an electric igniter. The open / close conductive strip includes a movable contact and a fixed contact, the movable contact is electrically in contact with the fixed contact, and at least a part of the movable contact is capable of moving relative to the fixed contact to be separated from the fixed contact. The electric igniter includes a first contact pin and a second contact pin, the first contact pin is electrically connected to the movable contact, and the second contact pin is electrically connected to the fixed contact. The interrupt piston is configured to cut off the fixed contact under driving of explosive pressure generated when the electric igniter explodes. When a current of the open / close conductive strip is greater than or equal to a first current threshold, electric power generated between the movable contact and the fixed contact is used to repel the movable contact from the fixed contact, so that an arc voltage is generated between the movable contact and the fixed contact. The arc voltage is used to drive the electric igniter to detonate, so that the power-off apparatus cuts off the open / close conductive strip through self-driving without a power supply.

Description

TECHNICAL FIELD

[0001] This application relates to the field of power-off technologies, and in particular, to a power-off apparatus and a power system.BACKGROUND

[0002] A power-off structure is mainly used for protection in a circuit. In a power-off scheme, a fuse and a through-current copper bar are both connected in series in a power loop. The fuse is responsible for short-circuit fault detection. When a short-circuit fault current flows through the power loop, if a fuse condition is met, the fuse performs thermal fusing and generates an arc voltage between two ends of the fuse. After sensing the arc voltage, a trigger circuit drives an electric igniter to interrupt the through-current copper bar, thereby isolating a faulty line. However, the trigger circuit can be used only when an external power supply is available. When the external power supply is unavailable due to a fault or other factors, the trigger circuit cannot be used either. This reduces safety and reliability.SUMMARY

[0003] Embodiments of this application provide a power-off apparatus that can be triggered through self-driving without a power supply, and a power system.

[0004] According to a first aspect, this application provides a power-off apparatus, where the power-off apparatus includes an open / close conductive strip, an interrupt piston, and an electric igniter; the open / close conductive strip includes a movable contact and a fixed contact, the movable contact is electrically in contact with the fixed contact, and at least a part of the movable contact is capable of moving relative to the fixed contact to be separated from the fixed contact; and the movable contact and the fixed contact are separately configured to connect to a power source to form a power loop; the electric igniter includes a first contact pin and a second contact pin, the first contact pin is electrically connected to the movable contact, and the second contact pin is electrically connected to the fixed contact; the interrupt piston is configured to cut off the fixed contact under driving of explosive pressure generated when the electric igniter explodes; and the movable contact and the fixed contact are further used in the following manner: when a current of the open / close conductive strip is greater than or equal to a first current threshold, electric power is generated between the movable contact and the fixed contact to repel the movable contact from the fixed contact, and an arc voltage is generated between the movable contact and the fixed contact, where the arc voltage drives the electric igniter to detonate.

[0005] When the power-off apparatus is used in the power system, the open / close conductive strip is configured to form a power loop with a power source. When a short-circuit fault occurs in the power loop, a short-circuit current flows through the open / close conductive strip. Because the short-circuit current is much greater than a current in a normal path of the power loop, electric power between the movable contact and the fixed contact is large, and the movable contact is further repelled from the fixed contact, so that the arc voltage is generated between the movable contact and the fixed contact. The arc voltage can detonate the electric igniter, and the electric igniter explodes to drive the interrupt piston to cut off the fixed contact. The first current threshold herein may be a threshold corresponding to the short-circuit current when the short-circuit fault occurs in the power loop.

[0006] According to the power-off apparatus provided in this application, the arc voltage generated between the movable contact and the fixed contact when the current of the open / close conductive strip is greater than or equal to the first current threshold is used to drive the electric igniter to ignite, and energy generated by explosion of the electric igniter drives the interrupt piston to cut off the fixed contact, so that the power-off apparatus is triggered through self-driving, to disconnect the power loop. Because the power-off apparatus is triggered through self-driving without a power supply without depending on an external power supply and power supply by the power system, not only application difficulty is low, but also safety and reliability of the power-off apparatus are improved, and a protection range is expanded.

[0007] In addition, because a power supply circuit and an external power supply that are dedicated to the power-off apparatus may not be disposed, a wiring structure is reduced. This is conducive to simplifying a structure of the power-off apparatus and a structure of the power system in which the power-off apparatus is used, and reducing costs of the power-off apparatus.

[0008] In addition, the arc voltage generated between the movable contact and the fixed contact when the short-circuit fault occurs drives the electric igniter to ignite, that is, the movable contact and the fixed contact can form a short-circuit fault detector, to improve sensitivity of the power-off apparatus.

[0009] According to the first aspect, in a possible implementation, the movable contact includes a fixed part and a movable part, one end of the movable part is connected to the fixed part, one end that is of the movable part and that is away from the fixed part is a free end, the movable part is configured to rotate relative to the fixed part, a spacing exists between the fixed part and the fixed contact, the movable part is in contact with the fixed contact, and when the current of the open / close conductive strip is greater than or equal to the first current threshold, the movable part is separated from the fixed contact.

[0010] In this possible implementation, one end of the movable part is connected to the fixed part, one end that is of the movable part and that is away from the fixed part is the free end, the movable part is configured to rotate relative to the fixed part, and the movable contact is contact with or is separated from the fixed contact by using a simple structure design, so that the structure of the power-off apparatus is simplified.

[0011] According to the first aspect, in a possible implementation, the movable contact further includes a connecting rod and an elastic part, the movable part is rotatably connected to the fixed part by using the connecting rod, the elastic part elastically abuts between the connecting rod and the movable part, and the elastic part is configured to abut the movable part on the fixed contact.

[0012] In this possible implementation, the elastic part is configured to abut the movable part on the fixed contact, to provide elastic pressure when the movable part is lapped on the fixed contact, so that a stable electrical connection can be formed between the movable contact and the fixed contact in a normal working state.

[0013] According to the first aspect, in a possible implementation, the connecting rod is connected to the fixed part, the movable part includes a main body and a first connection arm and a second connection arm that are convexly disposed on the main body, the connecting rod rotatably runs through the first connection arm, the connecting rod rotatably runs through the second connection arm, the first connection arm, the second connection arm, and the connecting rod enclose a slot, the elastic part is accommodated in the slot, and the elastic part elastically abuts between the main body and the connecting rod.

[0014] In this possible implementation, the elastic part is accommodated in the slot, and does not occupy space outside the open / close conductive strip, and this helps reduce the size of the power-off apparatus.

[0015] According to the first aspect, in a possible implementation, the open / close conductive strip further includes a flexible copper bar, and the copper bar is connected between the movable part and the fixed part.

[0016] In this possible implementation, the flexible copper bar may be a flexible conductive part such as a braided copper bar. The flexible copper bar is made of a flexible material and can be deformed. The flexible copper bar can improve smoothness of the movable contact in a process of relative movement between the movable part and the fixed part, and improve reliability of a through-current between the movable part and the fixed part.

[0017] According to the first aspect, in a possible implementation, the movable contact further includes a first terminal convexly disposed on the fixed part, a second terminal is disposed on the fixed contact, the first terminal is electrically connected to the first contact pin, and the second terminal is electrically connected to the second contact pin.

[0018] In this possible implementation, the first terminal is convexly disposed on the movable contact, and the second terminal is convexly disposed on the fixed contact, to facilitate wiring between the movable contact and the electric igniter and between the fixed contact and the electric igniter, and simplify assembly of the power-off apparatus.

[0019] According to the first aspect, in a possible implementation, the fixed contact includes a first part, a second part, and a third part that are sequentially connected in a first direction, a thickness of the first part is greater than a thickness of the second part, a thickness of the third part is greater than the thickness of the second part, the second part and the interrupt piston are arranged in a second direction and can be cut off by the interrupt piston, the first part is configured to be in contact with the movable contact, the first part is electrically connected to the electric igniter, and the first direction is perpendicular to the second direction.

[0020] In this possible implementation, because the thickness of the second part is less than the thickness of the first part and the thickness of the second part, it is easier to cut off the second part by the interrupt piston, so that a possibility that the fixed contact cannot be completely cut off is reduced, and reliability of the power-off apparatus is further improved.

[0021] According to the first aspect, in a possible implementation, the second part includes a plate body and a boss convexly disposed on the plate body, a limiting hole is disposed on a side that is of the interrupt piston and that faces the fixed contact, and the boss is accommodated in the limiting hole.

[0022] In this possible implementation, because the boss is accommodated in the limiting hole, movement of the interrupt piston in a direction different from the second direction is limited.

[0023] According to the first aspect, in a possible implementation, the power-off apparatus further includes a housing, the housing includes a first cavity and a second cavity that are disposed in the first direction, the fixed contact extends in the first direction, at least a part of the movable contact is accommodated in the first cavity, the fixed contact runs through the second cavity and is partially accommodated in the first cavity, the interrupt piston is accommodated in the first cavity, the electric igniter is accommodated in the first cavity, the interrupt piston is located between the fixed contact and the electric igniter in a second direction perpendicular to the first direction, the interrupt piston is capable of moving in the second direction, and the second direction is perpendicular to the first direction.

[0024] In this possible implementation, the housing is configured to bear and protect the open / close conductive strip, the interrupt piston, and the electric igniter. Because a contact part between the movable contact and the fixed contact, and the interrupt piston are respectively disposed in different cavities, interference between the movable contact and the interrupt piston is avoided.

[0025] According to the first aspect, in a possible implementation, the fixed contact extends in the first direction, the interrupt piston includes a guiding part and a cutting part that are connectively disposed in the second direction, the first direction is perpendicular to the second direction, the guiding part is in contact with an inner wall of the housing, the cutting part is located between the guiding part and a second part of the fixed contact, and the interrupt piston is capable of moving in the second direction.

[0026] In this possible implementation, when the interrupt piston is driven by explosive pressure of explosion of the electric igniter to move, the guiding part can move along the inner wall of the housing, so that smoothness of movement of the interrupt piston is improved.

[0027] According to the first aspect, in a possible implementation, a size of the cutting part in the first direction decreases in a direction in which the guiding part faces the fixed contact.

[0028] In this possible implementation, the size of the cutting part in the first direction decreases in the direction in which the guiding part faces the fixed contact. This helps reduce a contact area between a cutting edge and the second part, and helps improve efficiency of cutting off the fixed contact by the interrupt piston.

[0029] According to the first aspect, in a possible implementation, the electric igniter is fastened to the housing, a groove is disposed on a side that is of the guiding part and that is away from the cutting part, and at least a part of the electric igniter is accommodated in the groove.

[0030] In this possible implementation, the electric igniter reuses space in the interrupt piston without occupying other space. This helps reduce the size of the power-off apparatus.

[0031] According to the first aspect, in a possible implementation, a supporting convex column extending is disposed on an inner wall of the second cavity, the fixed contact is supported by the supporting convex column, and the supporting convex column, the fixed contact, and the interrupt piston are sequentially disposed.

[0032] In this possible implementation, the supporting convex column is configured to support the fixed contact.

[0033] According to a second aspect, an embodiment of this application further provides a power system. The power system includes a power source and the power-off apparatus according to the first aspect, both the fixed contact of the power-off apparatus and the movable contact of the power-off apparatus are electrically connected to the power source to form a power loop, and the cutting piston can cut off the fixed contact to disconnect the power loop.

[0034] According to the power system provided in this application, the arc voltage generated between the movable contact and the fixed contact in the power loop when a short-circuit fault occurs is used to drive the electric igniter to ignite, and energy generated by explosion of the electric igniter drives the interrupt piston to cut off the fixed contact, so that the power-off apparatus is triggered through self-driving, to disconnect the power loop. Because the power-off apparatus is triggered through self-driving without depending on an external power supply, safety and reliability of the power-off apparatus are improved.

[0035] In addition, because a power supply circuit dedicated to the power-off apparatus may not be disposed, a wiring structure is reduced. This is conducive to simplifying a structure of the power-off apparatus and a structure of the power system in which the power-off apparatus is used, and reducing costs of the power-off apparatus.

[0036] According to the second aspect, in a possible implementation, the power system further includes a controller and a trigger circuit, the trigger circuit is electrically connected to the first contact pin and the second contact pin of the electric igniter, the controller is configured to send a drive signal to the trigger circuit, and the drive signal drives the trigger circuit to apply a trigger voltage to the first contact pin and the second contact pin, so as to detonate the electric igniter.

[0037] In this possible implementation, the controller may control the trigger circuit to drive the electric igniter to detonate, so as to perform active protection when the controller determines that a fault occurs in the power system. In other words, the power system includes an active protection mode and a passive protection mode, so that the protection range of the power system is wider. In addition to receiving a drive signal for action, the power-off apparatus may further trigger an action signal through self-driving of a short-circuit detection mechanism of the power-off apparatus. In this way, when active and passive protection is implemented, power does not need to be independently supplied to a detection apparatus. Compared with a common detection apparatus driven by a power supply, in this application, a scheme design of a power supply loop is omitted, and reliability of self-driven triggering is improved.

[0038] According to the second aspect, in a possible implementation, the power system further includes a smoke sensor, and the controller controls the trigger circuit to detonate the electric igniter when a smoke concentration detected by the smoke sensor is greater than or equal to a smoke concentration threshold.

[0039] In this possible implementation, when the smoke concentration of the power system is greater than or equal to the smoke concentration threshold, it means that the power system has a possibility of catching fire, and there is a particular safety risk. The controller actively controls the trigger circuit to detonate the electric igniter, and explosive pressure of the electric igniter drives the interrupt piston to cut off the fixed contact, so as to actively disconnect the power loop. This facilitates fault isolation of the faulty power source, and improves safety, reliability, and intelligence of the power system.

[0040] According to the second aspect, in a possible implementation, the power system further includes a current monitor, the current monitor is configured to monitor a current in the power loop, and when the current detected by the current monitor is greater than or equal to a second current threshold, the controller controls the trigger circuit to detonate the electric igniter.

[0041] In this possible implementation, when the current detected by the current monitor is greater than or equal to the second current threshold, it means that a fault occurs in the power loop. The controller actively controls the trigger circuit to detonate the electric igniter, and explosive pressure of the electric igniter drives the interrupt piston to cut off the fixed contact, so as to disconnect the power loop. This facilitates fault isolation of the faulty power source, and improves safety, reliability, and intelligence of the power system.

[0042] According to the second aspect, in a possible implementation, the power system further includes a temperature sensor communicatively connected to the controller, the temperature sensor is configured to monitor a temperature of the power system, and when the temperature detected by the temperature sensor is greater than or equal to a temperature threshold, the controller controls the trigger circuit to detonate the electric igniter.

[0043] In this possible implementation, when the temperature of the power system is not less than the temperature threshold, it means that the power system has a possibility of overload and over-current, and there is a particular safety risk. The controller actively controls the trigger circuit to detonate the electric igniter, and explosive pressure of the electric igniter drives the interrupt piston to cut off the fixed contact, so as to actively disconnect the power loop. This facilitates fault isolation of the faulty power source, and improves safety, reliability, and intelligence of the power system.

[0044] In addition to the foregoing implementations, the power system may flexibly add trigger logic based on an actual application scenario requirement, including but not limited to the foregoing temperature, smoke, current, and other detection apparatuses.BRIEF DESCRIPTION OF DRAWINGS

[0045] FIG. 1 is an architectural diagram of a power system according to some implementations of this application; FIG. 2 is a three-dimensional diagram of a power-off apparatus according to some implementations of this application; FIG. 3 is a three-dimensional sectional view of a power-off apparatus according to some implementations of this application; FIG. 4 is a diagram of contact between a movable contact and a fixed contact of an open / close conductive strip according to some implementations of this application; FIG. 5 is a diagram of separation between a movable contact and a fixed contact of an open / close conductive strip according to some implementations of this application; FIG. 6 is a three-dimensional sectional view of a power-off apparatus according to some possible implementations of this application; FIG. 7 is a diagram of contact between a movable contact and a fixed contact of an open / close conductive strip according to some possible implementations of this application; and FIG. 8 is a diagram of separation between a movable contact and a fixed contact of an open / close conductive strip according to some possible implementations of this application. DESCRIPTION OF EMBODIMENTS

[0046] A power-off apparatus may be configured to cut off a faulty circuit, to ensure normal operation of each line, and meet normal power consumption of a user.

[0047] A manner of triggering the cut-off operation of the power-off apparatus is usually passive triggering with a power supply. In a power-off scheme, a fuse and a through-current copper bar are both connected in series in a power loop. The fuse is responsible for short-circuit fault detection. When a short-circuit fault current flows through the power loop, if a fuse condition is met, the fuse performs thermal fusing and generates an arc voltage between two ends of the fuse. After sensing the arc voltage, a trigger circuit drives an electric igniter to interrupt the through-current copper bar, thereby isolating a faulty line. However, the trigger circuit can be used only when an external power supply is available. When the external power supply is unavailable due to a fault or other factors, the trigger circuit cannot be used either. This reduces safety and reliability. In addition, this solution requires high reliability of the external power supply, and generally requires redundancy backup. As a result, it is difficult to perform wiring on an auxiliary power loop, and a passive protection feature can be used only when an input power supply is externally connected. This reduces safety and reliability of the power-off apparatus.

[0048] Based on this, this application provides a power-off apparatus that can be triggered through self-driving without a power supply, and a power system related to the power-off apparatus. The power-off apparatus includes an open / close conductive strip, an interrupt piston, and an electric igniter, the open / close conductive strip includes a movable contact and a fixed contact, the movable contact is electrically in contact with the fixed contact, and at least a part of the movable contact is capable of moving relative to the fixed contact to be separated from the fixed contact; the electric igniter includes a first contact pin and a second contact pin, the first contact pin is electrically connected to the movable contact, and the second contact pin is electrically connected to the fixed contact; and the interrupt piston is configured to cut off the fixed contact under driving of explosive pressure generated when the electric igniter explodes. The movable contact and the fixed contact are further used in the following manner: when a current of the open / close conductive strip is greater than or equal to a first current threshold, electric power is generated between the movable contact and the fixed contact to repel the movable contact from the fixed contact, and an arc voltage is generated between the movable contact and the fixed contact, where the arc voltage drives the electric igniter to detonate.

[0049] With reference to FIG. 1, the power system includes a power-off apparatus 101, a controller 103, a trigger circuit 104, and a power source 200. The power-off apparatus 101 is configured to connect to the power source 200, so that the power-off apparatus 101 is connected to the power source 200 and a power loop is formed. The power source 200 is configured to output power, to drive an electric device to work. The power-off apparatus 101 is configured to disconnect the power loop when the power loop is abnormal. The trigger circuit 104 is connected between the power-off apparatus 101 and the controller 103, and the controller 103 is configured to send a drive signal to the trigger circuit 104, so as to control the trigger circuit 104 to trigger the power-off apparatus 101 to power off the power loop.

[0050] The controller 103 may include one or more processors. The processor may be a central processing unit (Central Processing Unit, CPU), or may be another general-purpose processor, a digital signal processor (Digital Signal Processor, DSP), an application-specific integrated circuit (Application-Specific Integrated Circuit, ASIC), a field-programmable gate array (Field-Programmable Gate Array, FPGA) or another programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, or the like. The general-purpose processor may be a microprocessor, or the processor may be any conventional processor, or the like. The controller 103 may be a control center of the power system.

[0051] The power system may be a photovoltaic energy storage system, and the power source 200 may include a power conversion circuit, for example, a DC / DC conversion circuit or a DC / AC conversion circuit. It may be understood that the power system may alternatively be an electric vehicle, and the power source 200 may include a motor. An application scenario of the power system is not limited in this application. A structure of the power source 200 is not limited in this application, provided that the power source 200 and the power-off apparatus 101 form a power loop in which a current can flow.

[0052] As shown in FIG. 2, the power-off apparatus 101 is approximately in a box shape. With reference to FIG. 1 and FIG. 3, the power-off apparatus 101 includes an open / close conductive strip 22, an interrupt piston 24, and an electric igniter 26. The open / close conductive strip 22 includes a movable contact 224 and a fixed contact 226. The movable contact 224 is configured to connect to the power source 200, the fixed contact 226 is configured to electrically connect to the power source 200, and the movable contact 224 is in contact with the fixed contact 226, so that the power source 200, the fixed contact 226, and the movable contact 224 form the power loop. At least a part of the movable contact 224 is capable of moving relative to the fixed contact 226 to be separated from the fixed contact 226. The electric igniter 26 includes a first contact pin 262 and a second contact pin 264. The first contact pin 262 is electrically connected to the movable contact 224, and the second contact pin 264 is electrically connected to the fixed contact 226. The interrupt piston 24 is configured to cut off the fixed contact 226 under driving of explosive pressure generated when the electric igniter 26 explodes. When a current value of the open / close conductive strip 22 is greater than or equal to a first current threshold, electric power generated between the movable contact 224 and the fixed contact 226 is used to repel the movable contact 224 from the fixed contact 226, so that an arc voltage is generated between the movable contact 224 and the fixed contact 226, where the arc voltage drives the electric igniter 26 to detonate.

[0053] The electric igniter 26 is a general term for disposable components and apparatuses that are loaded with gunpowder or explosives and produce combustion or explosion after being stimulated by the outside, to ignite the gunpowder and detonate the explosives, or perform mechanical work.

[0054] When a current passes through a conductor, a magnetic field is generated around the conductor. The magnetic field exerts an action force on the current in the conductor, that is, the electric power. A magnitude of the electric power is related to a magnitude of the current flowing through the conductor. When the current value of the open / close conductive strip 22 is greater than or equal to the first current threshold, the electric power generated between the movable contact 224 and the fixed contact 226 is sufficient to repel the movable contact 224 from the fixed contact 226. When a short-circuit current flows through the power loop, the current of the open / close conductive strip 22 increases rapidly to a current value greater than or equal to the first current threshold. As a result, a magnetic field of the open / close conductive strip 22 increases rapidly, and the electric power increases rapidly to repel the movable contact 224 from the fixed contact 226.

[0055] The movable contact 224 is in contact with the fixed contact 226, and the movable contact 224, the fixed contact 226, and the power source 300 form a power loop through-current. When the current value of the open / close conductive strip 22 is greater than or equal to the first current threshold, the electric power generated between the movable contact 224 and the fixed contact 226 repels the movable contact 224 from the fixed contact 226, so that a high arc voltage is generated between the movable contact 224 and the fixed contact 226. Although the electric power separates the movable contact 224 from the fixed contact 226, a spacing between the movable contact 224 and the fixed contact 226 is small, a continuous arc voltage exists between the movable contact 224 and the fixed contact 226, and the power loop in which a short-circuit fault occurs cannot be disconnected.

[0056] The arc voltage is transferred to the first contact pin 262 and the second contact pin 264 of the electric igniter 26, the arc voltage drives the electric igniter 26 to detonate, and the interrupt piston 24 cuts off the fixed contact 226, to further cut off the faulty power loop, thereby implementing fault isolation. Cutting off the fixed contact 226 means cutting off the fixed contact 226 into two separate parts. In this way, the movable contact 224 and the fixed contact 226 form a short-circuit fault detector, and the short-circuit fault detector is configured to detect a short-circuit fault in the power loop. The movable contact 224 is electrically connected to the first contact pin 262 of the electric igniter 26, and the fixed contact 226 is electrically connected to the first contact pin 262 of the electric igniter 26. This is equivalent to that the electric igniter 26 and the short-circuit fault detector are connected in parallel.

[0057] According to the power-off apparatus 101 and the power system provided in this application, the arc voltage generated between the movable contact 224 and the fixed contact 226 in the power loop when a fault occurs in the power loop is used to drive the electric igniter 26 to ignite, and energy generated by explosion of the electric igniter 26 drives the interrupt piston 24 to cut off the fixed contact 226, so that the power-off apparatus 101 is triggered through self-driving, to disconnect the power loop. Because the power-off apparatus 101 may be triggered through self-driving without a power supply without depending on an external power supply, that is, the power-off apparatus 101 may automatically disconnect, without being controlled by the controller 103, the open / close conductive strip 22 when the short-circuit fault occurs in the power loop, to implement passive protection. In this way, not only application difficulty is low, but also safety and reliability of the power-off apparatus 101 are improved, and the protection range is expanded.

[0058] In addition, because a power supply circuit dedicated to the power-off apparatus 101 may not be disposed, a structure of the power-off apparatus 101 and a structure of the power system are simplified, and costs of the power-off apparatus 101 are reduced.

[0059] In some implementations of this application, the trigger circuit 104 can be connected to the first contact pin 262 and the second contact pin 264, to apply, to the electric igniter 26, a trigger voltage that can detonate the electric igniter 26. The controller 103, the trigger circuit 104, and the electric igniter 26 form an active protection loop. The movable contact 224, the fixed contact 226, and the electric igniter 26 can form a passive protection loop when the open / close conductive strip 22 flows through the short circuit. In other words, the power system may include an active protection mode and a passive protection mode. The active protection mode means that the controller 103 actively sends a drive signal to the trigger circuit 104, and the trigger circuit 104 detonates the electric igniter 26 based on the drive signal. The electric igniter 26 explodes and generates explosive pressure. The interrupt piston 24 cuts off the fixed contact 226 under impact of the explosive pressure, to disconnect the power loop, so that the faulty power source 200 is isolated. The passive protection mode means that the arc voltage generated between the movable contact 224 and the fixed contact 226 when the short-circuit fault occurs drives the electric igniter 26 to ignite, the electric igniter 26 explodes and generates an explosive pressure, and the interrupt piston 24 cuts off the fixed contact 226 under driving of the explosive pressure to disconnect the power loop, thereby isolating the faulty power source 200.

[0060] In addition to receiving a drive signal action, the power-off apparatus 101 may further trigger an action signal through self-driving of a short-circuit detector of the power-off apparatus. In this way, when active and passive protection is implemented, power does not need to be independently supplied to the short-circuit fault detector. Compared with a common detection apparatus driven by a power supply, in this application, a scheme design of a power supply loop is omitted, and reliability of self-driven triggering is improved. Because the power system includes the active protection and passive protection modes, protection reliability of the power system is improved, and the protection range is wider.

[0061] The power system is in a normal through-current mode. The movable contact 224 is reliably lapped with the fixed contact 226, and the current flows through the power loop, so as to ensure reliable power supply of the power system in a normal working condition.

[0062] With reference to FIG. 1 again, the power system further includes a detection unit 105, where the detection unit 105 is configured to: detect operating parameters of the power system and feed back the operating parameters to the controller 103. The controller 103 determines, based on the operating parameters detected by the detection unit 105, whether a fault occurs in the power system. If the operating parameters are within a preset range, the controller 103 determines that no fault occurs in the power system. If the operating parameters are not within the preset range, the controller 103 determines that a fault occurs in the power system, and the controller 103 sends a drive signal to the trigger circuit 104. The trigger circuit 104 applies a trigger voltage to the electric igniter 26 and detonates the explosive electric igniter 26. The explosive pressure generated by explosion of the electric igniter 26 drives the interrupt piston 24 to cut off the fixed contact 226, so as to disconnect the faulty power loop, thereby implementing fault isolation. The detection unit 105 monitors the operating parameters of the power system, so that the power system can perform active protection on the power loop when an exception occurs. This helps improve safety, reliability, and intelligence of the power system.

[0063] The detection unit 105 includes a smoke sensor 1051, the operating parameters include a smoke concentration, and the preset range includes a smoke concentration threshold. The smoke sensor 1051 is configured to: detect a smoke concentration of the power system, and feed back the smoke concentration to the controller 103. When the smoke concentration of the power system detected by the smoke sensor 1051 is greater than or equal to a smoke concentration threshold, the controller 103 determines that a fault occurs in the power system, the controller 103 drives the trigger circuit 104 to detonate the electric igniter 26, and the explosive pressure generated by explosion of the electric igniter 26 drives the interrupt piston 24 to cut off the fixed contact 226. When the smoke concentration of the power system is greater than or equal to the smoke concentration threshold, it means that the power system has a possibility of catching fire, and there is a particular safety risk. The controller 103 actively controls the trigger circuit 104 to detonate the electric igniter 26, and explosive pressure of the electric igniter 26 drives the interrupt piston 24 to cut off the fixed contact 226, so as to actively disconnect the power loop. This facilitates fault isolation of the faulty power source 200, and improves safety, reliability, and intelligence of the power system.

[0064] The detection unit 105 further includes a current monitor 1052, the operating parameters include a current value flowing through the power loop, and the preset range includes a second current threshold. The current monitor 1052 is configured to: detect a magnitude of a current in the power loop, and feed back the magnitude to the controller 103. When the current value detected by the current monitor 1052 is greater than or equal to the second current threshold, the controller 103 determines that a fault occurs in the power system, and the controller 103 controls the trigger circuit 104 to detonate the electric igniter 26, and the explosive pressure generated by explosion of the electric igniter 26 drives the interrupt piston 24 to cut off the fixed contact 226. The second current threshold may be less than the first current threshold. When the current value detected by the current monitor 1052 is greater than or equal to the second current threshold, it means that a fault occurs in the power loop. The controller 103 actively controls the trigger circuit 104 to detonate the electric igniter 26, and explosive pressure of the electric igniter 26 drives the interrupt piston 24 to cut off the fixed contact 226, so as to disconnect the power loop. This facilitates fault isolation of the faulty power source 200, and improves safety, reliability, and intelligence of the power system.

[0065] The detection unit 105 further includes a temperature sensor 1053, the operating parameters include a temperature of the power system, and the preset range includes a temperature threshold. The temperature sensor 1053 is configured to: detect a temperature of the power system and feed back the temperature to the controller 103. When the temperature detected by the temperature sensor 1053 is greater than or equal to the temperature threshold, the controller 103 determines that a fault occurs in the power system, the controller 103 controls the trigger circuit 104 to detonate the electric igniter 26, and the explosive pressure generated by explosion of the electric igniter 26 drives the interrupt piston 24 to cut off the fixed contact 226. When the temperature of the power system is greater than or equal to the temperature threshold, it means that the power system has a possibility of overload and over-current, and there is a particular safety risk. The controller 103 actively controls the trigger circuit 104 to detonate the electric igniter 26, and explosive pressure of the electric igniter 26 drives the interrupt piston 24 to cut off the fixed contact 226, so as to actively disconnect the power loop. This facilitates fault isolation of the faulty power source 200, and improves safety, reliability, and intelligence of the power system.

[0066] In addition to the foregoing implementations, trigger logic may be flexibly added based on an actual application scenario requirement. The detection unit includes but is not limited to the foregoing detection apparatuses such as the temperature sensor, the smoke sensor, and the current monitor.

[0067] In a state in which the controller 103 and the detection unit 105 are not powered on or are faulty, triggering with a power supply driven by the power system is no longer reliable, and passive protection is required. When a fault current occurs in the power loop, the electric power generated between the movable contact 224 and the fixed contact 226 causes the movable contact 224 to repel, and the arc is generated between the movable contact 224 and the fixed contact 226. In this case, the arc voltage generated by the movable contact 224 and the fixed contact 226 is transferred to two ends of the electric igniter 26 that are connected in parallel to two ends of the short-circuit fault detector. The instantaneous high arc voltage drives the electric igniter 26 to ignite, and the interrupt piston 24 moves towards the fixed contact 226 under the explosive pressure generated by detonation of the electric igniter 26, and cuts off the fixed contact 226, to disconnect the faulty power loop, thereby implementing fault isolation.

[0068] In some implementations of this application, with reference to FIG. 3, the power-off apparatus 101 further includes a housing 28. The housing 28 is configured to carry and protect the open / close conductive strip 22, the interrupt piston 24, and the electric igniter 26. The housing 28 includes a first cavity 286 and a second cavity 287 that are spaced apart from each other in a first direction X. The first cavity 286 is used for arrangement of the movable contact 224. The fixed contact 226 runs through the second cavity 287 in the first direction X, and is partially located in the first cavity 286. A supporting convex column 285 is convexly disposed on an inner wall of the second cavity 287, and the supporting convex column 285 extends in a second direction Z, to support the fixed contact 226. The first direction X is perpendicular to the second direction Z. The electric igniter 26 may be fastened on the housing 28 and accommodated in the second cavity 287. A structure of the housing 28 is not limited in this application. For example, the housing 28 may be a hollow housing, the open / close conductive strip 22 runs through the housing 28, and two ends protrude out of the housing 28. The interrupt piston 24 and the electric igniter 26 are located in the housing 28.

[0069] A material of the open / close conductive strip 22 may be made of copper or another conductive material, for example, aluminum. With reference to FIG. 3 and FIG. 4, the movable contact 224 includes a fixed part 2242, a movable part 2244, a connecting rod 2245, an elastic part 2246, and a first terminal 2248. The fixed part 2242 runs through the housing 28. Apart of the fixed part 2242 is accommodated in the first cavity 286, to be movably connected to the movable part 2244. A part of the fixed part 2242 protrudes out of the housing 28, to be electrically connected to the power source 200.

[0070] One end of the movable part 2244 is connected to the fixed part 2242, one end that is of the movable part 2244 and that is away from the fixed part 2242 is a free end, the movable part 2244 is configured to rotate relative to the fixed part 2242, there is a spacing between the fixed part 2242 and the fixed contact 226 in the first direction X, and the movable part 2244 is in contact with the fixed contact 226, as shown in FIG. 4.

[0071] The movable part 2244 includes a main body 2249 and a first connection arm 2251 and a second connection arm 2252 that are convexly disposed on the main body 2249. The connecting rod 2245 rotatably runs through the first connection arm 2251, and the connecting rod 2245 rotatably runs through the second connection arm 2252. The first connection arm 2251, the second connection arm 2252, and the connecting rod 2245 enclose a slot 2253. The elastic part 2246 is accommodated in the slot 2253, and does not occupy space outside the open / close conductive strip 22, and this helps reduce the size of the power-off apparatus 101. The elastic part 2246 elastically abuts between the main body 2249 and the connecting rod 2245. The elastic part 2246 is configured to abut the movable part 2244 on the fixed contact 226, to provide elastic pressure when the movable part 2244 is lapped on the fixed contact 226, so that a stable electrical connection can be formed between the movable contact 224 and the fixed contact 226 in a normal working state. The elastic part 2246 may be a cylindrical spring, a torsion spring, or the like. A type of the elastic part 2246 is not limited in this application. The first terminal 2248 is convexly disposed on the fixed part 2242, and the first terminal 2248 is configured to electrically connect to the electric igniter 26.

[0072] When a short-circuit current flows through the open / close conductive strip 22, the electric power generated between the movable contact 224 and the fixed contact 226 overcomes an elastic force of the elastic part 2246, so that the movable part 2244 is separated from the fixed contact 226 (as shown in FIG. 5). It may be understood that the first current threshold for triggering may be adjusted based on elastic pressure applied by the elastic part 2246 to the movable part 2244. Generally, larger elastic part pressure indicates a higher first current threshold for current triggering, and vice versa.

[0073] In some implementations of this application, the movable contact 224 may further include a flexible copper bar, and the flexible copper bar is connected between the movable part 2244 and the fixed part. The flexible copper bar may be a flexible conductive part such as a braided copper bar. The flexible copper bar is made of a flexible material and can be deformed. The flexible copper bar can improve smoothness of the movable contact 224 in a process of relative movement between the movable part 2244 and the fixed part 2242, and improve reliability of a through-current between the movable part 2244 and the fixed part 2242. The flexible copper bar may be separately welded on the movable part 2244 and the fixed part 2242. The flexible copper bar may alternatively be connected to the movable part 2244 and the fixed part 2242 in another manner, for example, a manner such as bonding.

[0074] The fixed contact 226 includes a first part 2261, a second part 2262, a third part 2263, and a second terminal 2264. The first part 2261, the second part 2262, and the third part 2263 are sequentially connected in the first direction X. One end that is of the first part 2261 and that is away from the second part 2262 is accommodated in the first cavity 286, to lap the movable part 2244, thereby implementing contact between the movable contact 224 and the fixed contact 226. The first part 2261 is electrically connected to the electric igniter 26. There is a spacing between the first part 2261 and the fixed contact 226 in the first direction X. The second part 2262 is accommodated in the second cavity 287. In the second direction Z, a thickness of the first part 2261 is greater than a thickness of the second part 2262, a thickness of the third part 2263 is greater than the thickness of the second part 2262, and the second part 2262 and the interrupt piston 24 are arranged in the second direction Z and can be cut off by the interrupt piston 24. The first direction X is perpendicular to the second direction Z.

[0075] The interrupt piston 24, the second part 2262, and the supporting convex column 285 are arranged sequentially in the second direction Z. The supporting convex column 285 supports the second part 2262, and the second part 2262 supports the interrupt piston 24. The interrupt piston 24 moves towards the second part 2262 and cuts off the second part 2262 under driving of the explosive pressure generated by explosion of the electric igniter 26. The second part 2262 includes a plate body 2265 and a boss 2266 convexly disposed on the plate body 2265. In the second direction Z, a thickness of the plate body 2265 is less than the thickness of the first part 2261, and the thickness of the plate body 2265 is less than the thickness of the second part 2262, so that it is convenient for the interrupt piston 24 to cut off the second part 2262. The boss 2266 is accommodated in the interrupt piston 24, and the boss 2266 is configured to limit the interrupt piston 24, to reduce a possibility that the interrupt piston 24 shakes. A slot 2269 disposed around the boss 2266 is disposed on the plate body 2265, and is configured to accommodate the interrupt piston 24.

[0076] In some implementations of this application, the plate body 2265 includes a first surface 2267 and a second surface 2268 that are disposed opposite to each other in the second direction Z. The first surface 2267 is disposed facing the interrupt piston 24. The boss 2266 protrudes from the first surface 2267. There are two slots 2269 on the first surface 2267 and the second surface 2268. The boss 2266 is located between the two slots 2269. The plate body 2265 is provided with the slot 2269 for accommodating the interrupt piston 24. The slot 2269 can limit movement of the interrupt piston 24 in the first direction X, to reduce a possibility that the interrupt piston 24 shakes when being disposed on the open / close conductive strip 22. To be specific, a thickness of a part that is of the plate body 2265 and that is in contact with the interrupt piston 24 is small in the second direction Z. In a process in which the interrupt piston 24 interrupts the fixed contact 226, a stress received by an inner wall of the slot 2269 may be the largest, and the inner wall is easily cut off by the interrupt piston 24. This helps shorten a time for cutting off the second part 2262 by the interrupt piston 24. Because there are a plurality of slots 2269, a risk of cutting off the second part 2262 by the interrupt piston 24 is reduced.

[0077] The third part 2263 runs through the housing 28 and is partially exposed outside the housing 28, and is configured to electrically connect to the power source 200.

[0078] The second terminal 2264 is convexly disposed on the first part 2261, and the second terminal 2264 is electrically connected to the electric igniter 26. The first terminal 2248 is convexly disposed on the movable contact 224, and the second terminal 2264 is convexly disposed on the fixed contact 226, to facilitate wiring between the movable contact 224 and the electric igniter 26 and between the fixed contact 226 and the electric igniter 26, and simplify assembly of the power-off apparatus 101. In a normal through-current mode of the power system, the movable contact 224 is reliably lapped with the fixed contact 226, a voltage between the first terminal 2248 and the second terminal 2264 is almost zero, and the current of the power system flows through the power loop, so as to ensure reliable power supply of the power system in a normal working condition.

[0079] A structure of the fixed contact 226 is not limited in this application. For example, thicknesses of the fixed contact 226 in the second direction Z may be consistent.

[0080] With reference to FIG. 3 again, the interrupt piston 24 includes a guiding part 242 and a cutting part 244 that are connectively disposed in the second direction Z. A size of the guiding part 242 in the first direction X is greater than a size of the cutting part 244 in the first direction X. In the second direction Z, the cutting part 244 is located between the guiding part 242 and the second part 2262. The guiding part 242 is in contact with the inner wall of the second cavity 287. When the interrupt piston 24 is driven by the explosive pressure of explosion of the electric igniter 26 to move in the second cavity 287, the guiding part 242 can move along the inner wall of the second cavity 287, so that smoothness of movement of the interrupt piston 24 is improved. A groove 2422 is disposed on a side that is of the guiding part 242 and that is away from the cutting part 244, and is configured to accommodate the electric igniter 26. The groove 2422 can provide space for releasing pressure for explosion of the electric igniter 26. A space size of the groove 2422 can determine a rising peak and a rising rate of explosive pressure in the groove 2422 when the electric igniter 26 explodes. Generally, smaller space of the groove 2422 indicates larger explosion peak pressure and a higher rising rate. A part of the electric igniter 26 is accommodated in the groove 2422. In this way, the electric igniter 26 reuses space of the interrupt piston 24 without occupying other space. This helps reduce the size of the power-off apparatus 101.

[0081] A size of the cutting part 244 in the first direction X decreases in a direction in which the guiding part 242 faces the fixed contact 226. The cutting part 244 forms a sharp cutting edge at an end away from the guiding part 242, and the cutting edge is in contact with the inner wall of the slot 2269. Because a contact area between the cutting edge and the second part 2262 is small, efficiency of cutting off the fixed contact 226 by the interrupt piston 24 is improved. The cutting part 244 is provided with a limiting hole 2442 on an end surface away from the guiding part 242, and the limiting hole 2442 is configured to accommodate the boss 2266. Because the boss 2266 is accommodated in the limiting hole 2442, movement of the interrupt piston 24 in a direction different from the second direction Z is limited. A structure of the interrupt piston 24 is not limited in this application. For example, the size of the cutting part 244 in the first direction X may be the same as a size of the guiding part 242 in the first direction X. It may be understood that, before the electric igniter 26 is detonated, the interrupt piston 24 may not be in contact with the fixed contact 226, and the interrupt piston 24 may be in contact with the housing 28 in a manner such as clamping.

[0082] In some possible implementations of this application, with reference to FIG. 6, FIG. 7, and FIG. 8, the movable contact 224 includes the fixed part 2242, the movable part 2244, and the first terminal 2248. The fixed part 2242 runs through the housing 28. The fixed part 2242 is accommodated in the housing 28, to be movably connected to the movable part 2244. A part of the fixed part 2242 protrudes out of the housing 28. The first terminal 2248 is configured to electrically connect to the electric igniter 26.

[0083] One end of the movable part 2244 is movably connected to the fixed part 2242. One end that is of the movable part 2244 and that is away from the fixed part 2242 is a free end. The movable part 2244 is configured to rotate relative to the fixed part 2242. There is a spacing between the fixed part 2242 and the fixed contact 226 in the first direction X. The movable part 2244 is in contact with the fixed contact 226. The movable contact 224 may omit the connecting rod 2245 and the elastic part 2246. For example, one end of the movable part 2244 is directly connected to the fixed part 2242 rotatably, and one end of the movable part 2244 is lapped with the fixed contact 226. The second terminal 2264 of the fixed contact 226 is configured to electrically connect to the electric igniter 26.

[0084] It should be understood that the expressions such as "include" and "may include" that can be used in this application represent existence of disclosed functions, operations, or constituent elements, and are not limited to one or more additional functions, operations, or constituent elements. In this application, the terms such as "include" and / or "have" may be construed as representing a particular feature, quantity, operation, constituent element, component, or a combination thereof, but cannot be construed as excluding existence or addition possibility of one or more other features, quantities, operations, constituent elements, components, or combinations thereof.

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

[0086] In this application, expressions including ordinal numbers such as "first" and "second" may modify elements. However, such elements are not limited by the expressions. For example, the expressions do not limit the order and / or importance of the elements. The expression is used only to distinguish one element from another. For example, a first user equipment and a second user equipment indicate different user equipments, although both the first user equipment and the second user equipment are user equipments. Similarly, without departing from the scope of this 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 to" or "accessing" another component, it should be understood that the component may be directly connected to or access the another component, or there may be another component between the component and the another component. In addition, when a component is referred to as "being directly connected to" or "directly accessing" another component, it should be understood that there is no component between the component and the another component.

[0088] The foregoing descriptions are merely specific implementations of this application, but are not intended to limit the protection scope of this application. Any variation or replacement readily figured out by a person skilled in the art within the technical scope disclosed in this application shall fall within the protection scope of this application. Therefore, the protection scope of this application shall be subject to the protection scope of the claims.

Claims

1. A power-off apparatus, wherein the power-off apparatus comprises an open / close conductive strip, an interrupt piston, and an electric igniter; the open / close conductive strip comprises a movable contact and a fixed contact, the movable contact is electrically in contact with the fixed contact, and at least a part of the movable contact is capable of moving relative to the fixed contact to be separated from the fixed contact; and the movable contact and the fixed contact are separately configured to connect to a power source to form a power loop; the electric igniter comprises a first contact pin and a second contact pin, the first contact pin is electrically connected to the movable contact, and the second contact pin is electrically connected to the fixed contact; the movable contact and the fixed contact are further used in the following manner: when a current of the open / close conductive strip is greater than or equal to a first current threshold, electric power is generated between the movable contact and the fixed contact to repel the movable contact from the fixed contact, and an arc voltage is generated between the movable contact and the fixed contact, wherein the arc voltage drives the electric igniter to detonate; and the interrupt piston is configured to cut off the fixed contact under driving of explosive pressure generated when the electric igniter explodes, so as to disconnect the power loop.

2. The power-off apparatus according to claim 1, wherein the movable contact comprises a fixed part and a movable part, the movable part is rotatably connected to the fixed part, a spacing exists between the fixed part and the fixed contact, the movable part is configured to be in contact with the fixed contact, and when the current of the open / close conductive strip is greater than or equal to the first current threshold, the movable part is separated from the fixed contact.

3. The power-off apparatus according to claim 2, wherein the movable contact further comprises a connecting rod and an elastic part, the movable part is rotatably connected to the fixed part by using the connecting rod, the elastic part elastically abuts between the connecting rod and the movable part, and the elastic part is configured to abut the movable part on the fixed contact.

4. The power-off apparatus according to claim 3, wherein the connecting rod is connected to the fixed part, the movable part comprises a main body and a first connection arm and a second connection arm that are convexly disposed on the main body, the connecting rod rotatably runs through the first connection arm, the connecting rod rotatably runs through the second connection arm, the first connection arm, the second connection arm, and the connecting rod enclose a slot, the elastic part is accommodated in the slot, and the elastic part elastically abuts between the main body and the connecting rod.

5. The power-off apparatus according to claim 2, wherein the open / close conductive strip further comprises a flexible copper bar, and the copper bar is connected between the movable part and the fixed part.

6. The power-off apparatus according to claim 2, wherein the movable contact further comprises a first terminal convexly disposed on the fixed part, a second terminal is disposed on the fixed contact, the first terminal is electrically connected to the first contact pin, and the second terminal is electrically connected to the second contact pin.

7. The power-off apparatus according to claim 2, wherein the fixed contact comprises a first part, a second part, and a third part that are sequentially connected in a first direction, a thickness of the first part is greater than a thickness of the second part, a thickness of the third part is greater than the thickness of the second part, the second part and the interrupt piston are arranged in a second direction and are cut off by the interrupt piston, the first part is configured to be in contact with the movable contact, the first part is electrically connected to the electric igniter, and the first direction is perpendicular to the second direction.

8. The power-off apparatus according to claim 7, wherein the second part comprises a plate body and a boss convexly disposed on the plate body, a limiting hole is disposed on a side that is of the interrupt piston and that faces the fixed contact, and the boss is accommodated in the limiting hole.

9. The power-off apparatus according to claim 1, wherein the power-off apparatus further comprises a housing, the housing comprises a first cavity and a second cavity that are disposed in the first direction, the fixed contact extends in the first direction, at least a part of the movable contact is accommodated in the first cavity, the fixed contact runs through the second cavity and is partially accommodated in the first cavity, the interrupt piston is accommodated in the first cavity, the electric igniter is accommodated in the first cavity, the interrupt piston is located between the fixed contact and the electric igniter in a second direction, the interrupt piston is capable of moving in the second direction, and the second direction is perpendicular to the first direction.

10. The power-off apparatus according to claim 9, wherein the interrupt piston comprises a guiding part and a cutting part that are connectively disposed in the second direction, the guiding part is in contact with an inner wall of the second cavity, and the cutting part is located between the guiding part and a second part of the fixed contact.

11. The power-off apparatus according to claim 10, wherein a size of the cutting part in the first direction decreases in a direction in which the guiding part faces the fixed contact.

12. The power-off apparatus according to claim 9, wherein the electric igniter is fastened to the housing, a groove is disposed on a side that is of the interrupt piston and that is away from the interrupt piston, and at least a part of the electric igniter is accommodated in the groove.

13. The power-off apparatus according to claim 9, wherein a supporting convex column extending in the second direction is disposed on an inner wall of the second cavity, the fixed contact is supported by the supporting convex column, and the supporting convex column, the fixed contact, and the interrupt piston are sequentially disposed.

14. A power system, wherein the power system comprises a power source and the power-off apparatus according to any one of claims 1 to 13, both the fixed contact of the power-off apparatus and the movable contact of the power-off apparatus are electrically connected to the power source to form a power loop, and the cutting piston can cut off the fixed contact to disconnect the power loop.

15. The power system according to claim 14, wherein the power system further comprises a controller and a trigger circuit, the trigger circuit is electrically connected to the first contact pin and the second contact pin of the electric igniter, the controller is configured to send a drive signal to the trigger circuit, and the drive signal drives the trigger circuit to apply a trigger voltage to the first contact pin and the second contact pin, so as to detonate the electric igniter.

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