Multi-source circuit protection device and circuit system

Abstract

The application provides a multi-source circuit protection device and a circuit system, and belongs to the technical field of circuit protection. The micro gas generator module receives an active excitation trigger signal sent by an external controller through a first signal end. The micro gas generator module obtains a passive excitation trigger signal from a passive excitation signal line through a second signal end, and the passive excitation signal line is also connected with a main loop conductive row. The transmission time of the active excitation trigger signal is less than that of the passive excitation trigger signal. The micro gas generator module is used for generating high-pressure gas under the triggering of the first trigger signal and / or the second trigger signal, so as to drive the cut-off piston to move towards the main loop conductive row and cut off the main loop conductive row. The application can achieve an independent signal loop of active excitation and passive excitation, so as to prevent the breakdown problem caused by the common node of active excitation and passive excitation, and further improve the safety and reliability of the multi-source circuit protection device.

Description

Technical Field

[0001] This application relates to the field of circuit protection technology, and more specifically, to a multi-source circuit protection device and circuit system. Background Technology

[0002] Circuit protection devices, as an indispensable component of electronic power systems, are mainly used to ensure the safe operation of circuits and equipment under abnormal circuit conditions, so as to prevent danger and damage.

[0003] Currently, conventional circuit protection devices are generally triggered by active excitation, meaning an external controller sends a trigger signal to the micro gas generator (MGG), which then performs fuse protection under the action of the trigger signal. However, this type of circuit protection device has too many intermediate processing steps, and failure of any step may cause the circuit protection device to fail to perform fuse protection. To solve this problem, existing technology has proposed a circuit protection device triggered by both active and passive excitation. In this device, the passive excitation serves as backup protection and can directly send a trigger signal to the MGG after drawing power from the main circuit. The MGG can then achieve fuse protection under the combined triggering of active and passive excitation.

[0004] However, in circuit protection devices triggered by both active and passive excitation, the active and passive excitation signals share the same MGG (Mechanical Gauge), and a potential difference exists between the active and passive excitation trigger signal circuits, which can easily cause MGG breakdown. Therefore, the relevant technical solutions suffer from poor reliability and safety of the circuit protection device. Summary of the Invention

[0005] The purpose of this application is to provide a multi-source circuit protection device and circuit system that can achieve independent signal loops for active and passive excitation, so as to prevent breakdown problems caused by shared nodes of active and passive excitation, thereby improving the safety and reliability of the multi-source circuit protection device.

[0006] The embodiments of this application are implemented as follows:

[0007] A first aspect of this application provides a multi-source circuit protection device, which includes: a micro gas generator module and a cut-off piston;

[0008] The micro gas generator module is located on top of the cut-off piston, which is located on top of the main circuit conductive busbar, and there is a preset distance between the bottom of the cut-off piston and the upper surface of the main circuit conductive busbar.

[0009] The first signal terminal of the micro gas generator module is connected to an external controller, and the micro gas generator module receives the active excitation trigger signal sent by the external controller through the first signal terminal;

[0010] The second signal terminal of the micro gas generator module is connected to the passive excitation signal line, which is also connected to the main circuit busbar. The micro gas generator module obtains the passive excitation trigger signal from the passive excitation signal line through the second signal terminal.

[0011] The miniature gas generator module is used to generate high-pressure gas under the triggering of an active excitation trigger signal and / or a passive excitation trigger signal, so as to push the cut-off piston toward the main circuit busbar to cut off the main circuit busbar.

[0012] As one possible implementation, the micro gas generator module includes: a first micro gas generator and a second micro gas generator;

[0013] The multi-source circuit protection device also includes: a first mounting cavity, a second mounting cavity, and a cutting piston movable cavity. The lower edge of the first mounting cavity is located directly above the upper cover of the cutting piston movable cavity. The second mounting cavity is located inside the cutting piston, and the upper edge of the second mounting cavity is located directly below the upper cover of the cutting piston movable cavity.

[0014] The first micro gas generator is located in the first mounting cavity, the second micro gas generator is located in the second mounting cavity, and the cut-off piston is located in the cut-off piston movable cavity.

[0015] As one possible implementation, the first micro gas generator has an encapsulation housing, and the first signal terminal of the first micro gas generator is connected to an external controller through the encapsulation housing. The first micro gas generator receives an active excitation trigger signal sent by the external controller via the first signal terminal.

[0016] The second signal terminal of the second micro gas generator passes through the package housing and is connected to the passive excitation signal line. The second micro gas generator obtains the passive excitation trigger signal from the passive excitation signal line through the second signal terminal.

[0017] The movable chamber of the cutting piston is also equipped with a limiting member that fixes the cutting piston, and one end of the limiting member is connected to the cutting piston.

[0018] As one possible implementation, a thin film is provided inside the first mounting cavity near the bottom of the first micro gas generator;

[0019] When the first signal terminal of the first micro gas generator receives the first trigger signal, it generates a first high-pressure gas under the action of the first trigger signal and breaks through the film. At the same time, the circuit between the passive excitation signal line and the second signal terminal of the second micro gas generator is broken. Both the cut-off piston and the second micro gas generator move toward the main circuit busbar under the action of the first high-pressure gas, so that the main circuit busbar is disconnected under the impact force of the cut-off piston.

[0020] In one possible implementation, when the first signal terminal of the first micro gas generator receives the second trigger signal, it generates a second high-pressure gas under the action of the second trigger signal and breaks through the membrane. Both the cut-off piston and the second micro gas generator move toward the main circuit busbar under the action of the second high-pressure gas, and the circuit between the passive excitation signal line and the second signal terminal is not broken.

[0021] When the circuit between the passive excitation signal line and the second signal terminal is not broken, the passive excitation signal line detects a circuit fault signal. The second signal terminal of the second micro gas generator obtains a third trigger signal from the passive excitation signal line. Under the action of the third trigger signal, the second micro gas generator generates a third high-pressure gas. Under the action of the third high-pressure gas, the cut-off piston continues to move toward the main circuit conductive busbar to cut off the main circuit conductive busbar.

[0022] Among them, the transmission time of the active excitation trigger signal is shorter than that of the passive excitation trigger signal.

[0023] As one possible implementation, when the first signal terminal of the first micro gas generator does not receive a trigger signal from the external controller, or when the first micro gas generator fails to break through the membrane after receiving a trigger signal from the external controller, the circuit between the passive excitation signal line and the second signal terminal of the second micro gas generator is connected. The passive excitation signal line detects a circuit fault signal, and the second signal terminal of the second micro gas generator obtains a fourth trigger signal from the passive excitation signal line. Under the action of the fourth trigger signal, the second micro gas generator generates a fourth high-pressure gas, and the cut-off piston moves toward the main circuit conductive busbar under the action of the fourth high-pressure gas to cut off the main circuit conductive busbar.

[0024] Among them, the transmission time of the active excitation trigger signal is shorter than that of the passive excitation trigger signal.

[0025] As one possible implementation, the main circuit conductive busbar is a copper busbar of a preset thickness, and the main circuit conductive busbar between the limiting member and the cutting piston is the weak area of ​​the main circuit conductive busbar.

[0026] As one possible implementation, the cut-off piston also includes: a storage tank;

[0027] When both the cut-off piston and the second micro gas generator move downwards under the action of the first high-pressure gas, the signal line of the second signal terminal of the second micro gas generator is pulled out from the storage tank, so that the second micro gas generator can obtain a third trigger signal from the passive excitation signal line.

[0028] As one possible implementation, the multi-source circuit protection device further includes: a first plug-in terminal and a second plug-in terminal, both of which are disposed on the upper surface of the package housing;

[0029] The active excitation trigger signal line of the external controller is connected to the first signal terminal of the first micro gas generator through the first plug-in terminal, and the passive excitation signal line is connected to the second signal terminal of the second micro gas generator through the second plug-in terminal.

[0030] A second aspect of this application provides a circuit system that includes the multi-source circuit protection device described in the first aspect.

[0031] The beneficial effects of the embodiments of this application include:

[0032] This application provides a multi-source circuit protection device, which consists of a micro gas generator module and a cut-off piston. The micro gas generator module is located on top of the cut-off piston, which is located on top of the main circuit busbar. The first signal terminal of the micro gas generator module is connected to an external controller, and the micro gas generator module receives an active excitation trigger signal sent by the external controller through the first signal terminal. The second signal terminal of the micro gas generator module is connected to a passive excitation signal line, which is also connected to the main circuit busbar. The micro gas generator module obtains a passive excitation trigger signal from the passive excitation signal line through the second signal terminal. In this design, the transmission time of the active excitation trigger signal is shorter than that of the passive excitation trigger signal. Thus, the micro gas generator module preferentially generates high-pressure gas under the action of the active excitation trigger signal. The cutting piston moves towards the main circuit busbar under the initial action of the high-pressure gas. If the cutting piston, driven by the high-pressure gas generated under the active excitation trigger signal, cannot completely cut off the main circuit busbar, the passive excitation signal line detects a circuit fault in the main circuit busbar. The passive excitation signal line then draws a portion of the current from the main circuit busbar as the passive excitation trigger signal and sends it to the second signal terminal of the micro gas generator module. Under the action of the passive excitation trigger signal, the micro gas generator module generates high-pressure gas again, pushing the cutting piston to continue moving towards the main circuit busbar, thereby cutting off the main circuit busbar. The active excitation trigger signal comes first, and the passive excitation trigger signal serves as a backup excitation source. The sequential timing of the active and passive excitation trigger signals effectively avoids potential differences between them that could cause breakdown of the micro gas generator. In this way, independent signal loops for active and passive excitation can be achieved, preventing breakdown problems caused by shared nodes of active and passive excitation, thereby improving the safety and reliability of multi-source circuit protection devices. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a system block diagram of an existing active excitation-triggered circuit protection device;

[0035] Figure 2 This is a system block diagram of an existing circuit protection device with both active and passive excitation nodes.

[0036] Figure 3A schematic diagram of the structure of the first type of multi-source circuit protection device provided in the embodiments of this application;

[0037] Figure 4 This is a schematic diagram of the structure of the second type of multi-source circuit protection device provided in the embodiments of this application;

[0038] Figure 5 A schematic diagram illustrating the working state of the first type of multi-source circuit protection device provided in the embodiments of this application;

[0039] Figure 6 This is a schematic diagram of the working state of the second type of multi-source circuit protection device provided in the embodiments of this application;

[0040] Figure 7 This is a schematic diagram of a circuit system provided in an embodiment of this application.

[0041] Figure descriptions: 10: Multi-source circuit protection device; 101: Miniature gas generator module; 1011: First miniature gas generator; 1012: Second miniature gas generator; 102: Cut-off piston; 1021: Second mounting cavity; 1022: Storage tank; 103: Passive excitation signal line; 104: First mounting cavity; 1041: Encapsulation shell; 411: First plug-in terminal; 412: Second plug-in terminal; 105: Cut-off piston movable cavity; 1051: Limiting member; 20: Main circuit conductive busbar. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0043] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0044] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0045] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In addition, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0046] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0047] Currently, conventional circuit protection devices are generally triggered by active excitation, where an external controller sends a trigger signal to a miniature gas generator, which then performs fuse protection under the action of the trigger signal. However, this type of circuit protection device has too many intermediate processing steps, and failure of any step in the active excitation triggering process may prevent the circuit protection device from performing fuse protection. To solve this problem, existing technology has proposed a circuit protection device triggered by both active and passive excitation. The passive excitation serves as a backup protection for this circuit protection device and can directly send a trigger signal to the miniature gas generator after drawing power from the main circuit. The miniature gas generator can then achieve fuse protection under the combined triggering of active and passive excitation. However, in this scheme, active and passive excitation share a single miniature gas generator, and a potential difference exists between the active and passive excitation trigger signal circuits, which can cause the miniature gas generator to break down. This results in low safety and reliability of the circuit protection device.

[0048] To address this, this application provides a multi-source circuit protection device, comprising a miniature gas generator module and a cut-off piston. A first signal terminal of the miniature gas generator module is connected to an external controller, and a second signal terminal is connected to a passive excitation signal line, which is also connected to the main circuit busbar. The miniature gas generator module receives an active excitation trigger signal from the external controller via its first signal terminal, and receives a passive excitation trigger signal transmitted via the wireless excitation signal line via its second signal terminal. Triggered by the active and / or passive excitation trigger signals, the miniature gas generator module generates high-pressure gas to push the cut-off piston toward the main circuit busbar, thereby cutting off the main circuit busbar. This achieves independent signal circuits for active and passive excitation, preventing breakdown problems caused by shared nodes between active and passive excitation signals, thus improving the safety and reliability of the multi-source circuit protection device.

[0049] Figure 1 See the system block diagram of an existing actively triggered circuit protection device. Figure 1 Conventional active-charge triggered circuit protection devices are implemented using explosive switches, which are connected in series with the main circuit busbar. When the active-charge loop detects a circuit fault in the main circuit, it applies an active-charge trigger signal to the explosive switch. The explosive switch detonates under the action of the active-charge trigger signal, thereby disconnecting the main circuit. Specifically, the active-charge loop senses the current flowing through the main circuit via a current transformer. The acquisition circuit collects the induced current from the current transformer and transmits the collected current signal to the current signal judgment circuit. The current signal judgment circuit determines whether a circuit fault exists in the main circuit based on the received current signal. If a fault is found, the current signal judgment circuit reports the circuit fault information to the control circuit. The control circuit outputs an active-charge trigger signal to the explosive switch based on the received circuit fault information. The explosive switch detonates under the action of the active-charge trigger signal, thus disconnecting the main circuit with the circuit fault.

[0050] Therefore, Figure 1 The active excitation loop of a circuit protection device requires multiple processing stages, including a current transformer, a data acquisition circuit, a current signal judgment circuit, and a control loop, to complete one active excitation triggering. If any of these processing stages—current transformer, data acquisition circuit, current signal judgment circuit, or control loop—malfunctions, the operation of the active excitation loop will be affected.

[0051] Figure 2 Here is a system block diagram of an existing circuit protection device with both active and passive excitation nodes. (See [link]) Figure 2 The circuit protection device for active and passive excitation sharing a node is in Figure 1Based on this, a portion of the current from the main circuit is used as a passive excitation trigger signal to trigger the explosion switch. When there is a circuit fault in the main circuit, the active excitation loop will send an active excitation trigger signal to the explosion switch. The passive excitation signal line will take a portion of the current from the main circuit as a passive excitation trigger signal and send it to the explosion switch so that the explosion switch will detonate and the main circuit with the circuit fault will be disconnected.

[0052] However, Figure 2 In this circuit protection device, both the active and passive excitation trigger signals act on the same explosion switch. There is a potential difference between the active and passive excitation trigger signals. This potential difference may cause the explosion switch to break down, resulting in its failure and preventing the circuit protection device from detonating normally.

[0053] The following description, in conjunction with the accompanying drawings, provides a detailed explanation of the multi-source circuit protection device and circuit system provided in the embodiments of this application.

[0054] Among them, the multi-source circuit protection device 10 is mainly used for circuit safety protection. When the circuit experiences overload, short circuit, overcurrent or other circuit faults, the multi-source circuit protection device 10 can quickly cut off the circuit to avoid more serious losses caused by the circuit fault.

[0055] Figure 3 See the schematic diagram of a multi-source circuit protection device provided in this application. Figure 3 This application provides a multi-source circuit protection device 10, which includes a micro gas generator module 101 and a cut-off piston 102.

[0056] Optionally, the micro gas generator module 101 is composed of multiple micro gas generators. The micro gas generator module 101 can generate high-pressure gas, which can provide driving force for the movement of the cut-off piston 102, so that the cut-off piston 102 can cut off the main circuit, thereby achieving the purpose of circuit protection.

[0057] The micro gas generator module 101 is located on top of the cut-off piston 102, which is located on top of the main circuit conductive busbar 20, and there is a preset distance between the bottom of the cut-off piston 102 and the upper surface of the main circuit conductive busbar 20.

[0058] Optionally, the micro gas generator module 101 is located on top of the cut-off piston 102. When the micro gas generator module 101 generates high-pressure gas, the high-pressure gas flows downward from the top of the cut-off piston 102, thereby pushing the cut-off piston 102 downward.

[0059] Optionally, the cut-off piston 102 is located at the top of the main circuit conductive busbar 20. The cut-off piston 102 is pushed downward by the high-pressure gas generated by the micro gas generator module 101, thereby breaking through the main circuit conductive busbar 20 to cut off the main circuit conductive busbar 20 and realize the circuit protection function.

[0060] Optionally, the preset distance refers to the initial position between the cut-off piston 102 and the main circuit conductive busbar 20 when no overcurrent or overload fault occurs in the main circuit conductive busbar 20. The preset distance can ensure a safe distance between the cut-off piston 102 and the main circuit conductive busbar 20 under normal operating conditions. The preset distance can be 10 mm, 50 mm, 1 cm, etc., and this application does not make a specific limitation in this regard.

[0061] The first signal terminal of the micro gas generator module 101 is connected to an external controller, and the micro gas generator module 101 receives the active excitation trigger signal sent by the external controller through the first signal terminal.

[0062] Optionally, the first signal terminal of the micro gas generator module 101 is connected to the active excitation trigger signal line of the external controller, and the micro gas generator module 101 receives the active excitation trigger signal sent by the external controller through the first signal terminal. The active excitation trigger signal is a control signal actively sent by the external controller, and can be a level signal, an analog signal, etc., which are not specifically limited in this application.

[0063] It is worth noting that the control loop that sends the active excitation trigger signal from the external controller is related to... Figure 1 The processing flow of the active excitation trigger signal shown in the prior art is the same, and will not be described in detail here.

[0064] The second signal terminal of the micro gas generator module 101 is connected to the passive excitation signal line 103, which is also connected to the main circuit busbar 20. The micro gas generator module 101 obtains the passive excitation trigger signal from the passive excitation signal line 103 through the second signal terminal.

[0065] Optionally, the second signal terminal of the micro gas generator module 101 is connected to the passive excitation signal line 103. The micro gas generator module 101 receives the passive excitation trigger signal transmitted by the passive excitation signal line 103 via the second signal terminal. The passive excitation trigger signal can be a current signal, and this application does not specifically limit it.

[0066] Optionally, the passive excitation signal line 103 is also connected to the main circuit busbar 20. When the multi-source circuit protection device 10 cuts the main circuit busbar 20 for the first time under the drive of the active excitation trigger signal sent by the external controller, the passive excitation signal line 103 begins to collect the current signal flowing through the main circuit busbar 20. If the passive excitation signal line 103 can also collect the fault current on the main circuit busbar 20, the passive excitation signal line 103 extracts part of the current from the main circuit busbar 20 as a passive excitation trigger signal and feeds it back to the second signal terminal of the micro gas generator module 101.

[0067] The micro gas generator module 101 is used to generate high-pressure gas under the triggering of an active excitation trigger signal and / or a passive excitation trigger signal, so as to push the cut-off piston 102 toward the main circuit conductive bus 20 to cut off the main circuit conductive bus 20.

[0068] Optionally, when the micro gas generator module 101 can generate an impact force that completely cuts off the main circuit conductive busbar 20 under the action of an active excitation trigger signal, the micro gas generator module 101 generates high-pressure gas under the action of an active excitation trigger signal. At this time, the passive excitation signal line cannot extract the passive excitation trigger signal from the main circuit conductive busbar 20. The cut-off piston impacts the main circuit conductive busbar 20 under the action of the high-pressure gas, so as to achieve the purpose of cutting off the main circuit conductive busbar 20 with circuit fault.

[0069] Optionally, when the impact force provided by the high-pressure gas generated by the micro gas generator module 101 under the action of the active excitation trigger signal is insufficient to push the cut-off piston 102 to completely cut off the main circuit conductive busbar 20, the passive excitation signal line 103 can collect the circuit fault signal from the main circuit conductive busbar 20. The passive excitation signal line 103 can extract a portion of the current from the main circuit conductive busbar 20 as a passive excitation trigger signal and send it to the second signal terminal of the micro gas generator module 101. The micro gas generator module 101 generates high-pressure gas under the passive excitation trigger signal. The high-pressure gas further provides impact force to the cut-off piston 102. The secondary impact force can ensure that the main circuit conductive busbar 20 is completely cut off by the cut-off piston 102, thereby achieving the purpose of protecting the circuit.

[0070] Optionally, when the micro gas generator module 101 does not receive an active excitation trigger signal, or when the high-pressure gas generated by the micro gas generator module 101 under the action of the active excitation trigger signal cannot push the cut-off piston 102 even slightly, the passive excitation signal line 103 can collect a circuit fault signal from the main circuit busbar 20. The passive excitation signal line 103 extracts a portion of the current collected from the main circuit busbar 20 as a passive excitation trigger signal and sends it to the second signal terminal of the micro gas generator module 101. Under the action of the passive excitation trigger signal, the micro gas generator module 101 generates high-pressure gas, and the cut-off piston 102 moves towards the main circuit busbar 20 under the action of the high-pressure gas to cut off the main circuit busbar 20.

[0071] It is worth noting that the micro gas generator module 101 preferentially generates high-pressure gas under the action of the active excitation trigger signal, while the passive excitation trigger signal serves as a backup excitation source. Only when the high-pressure gas generated under the action of the active excitation trigger signal cannot completely cut off the main circuit conductive busbar 20, does the passive excitation trigger signal play a role in triggering the micro gas generator module 101.

[0072] In this embodiment, a multi-source circuit protection device is formed by a micro gas generator module and a cut-off piston. The micro gas generator module is located on top of the cut-off piston, which is located on top of the main circuit busbar. The first signal terminal of the micro gas generator module is connected to an external controller, and the micro gas generator module receives an active excitation trigger signal sent by the external controller through the first signal terminal. The second signal terminal of the micro gas generator module is connected to a passive excitation signal line, which is also connected to the main circuit busbar. The micro gas generator module obtains a passive excitation trigger signal from the passive excitation signal line through the second signal terminal. In this design, the transmission time of the active excitation trigger signal is shorter than that of the passive excitation trigger signal. Thus, the micro gas generator module preferentially generates high-pressure gas under the action of the active excitation trigger signal. The cutting piston moves towards the main circuit busbar under the initial action of the high-pressure gas. If the cutting piston, driven by the high-pressure gas generated under the active excitation trigger signal, cannot completely cut off the main circuit busbar, the passive excitation signal line detects a circuit fault in the main circuit busbar. The passive excitation signal line then draws a portion of the current from the main circuit busbar as the passive excitation trigger signal and sends it to the second signal terminal of the micro gas generator module. Under the action of the passive excitation trigger signal, the micro gas generator module generates high-pressure gas again, pushing the cutting piston to continue moving towards the main circuit busbar, thereby cutting off the main circuit busbar. The active excitation trigger signal comes first, and the passive excitation trigger signal serves as a backup excitation source. The sequential timing of the active and passive excitation trigger signals effectively avoids potential differences between them that could cause breakdown of the micro gas generator. In this way, independent signal loops for active and passive excitation can be achieved, preventing breakdown problems caused by shared nodes of active and passive excitation, thereby improving the safety and reliability of multi-source circuit protection devices.

[0073] In one alternative implementation, see [link to implementation details]. Figure 4 The aforementioned micro gas generator module 101 includes: a first micro gas generator 1011 and a second micro gas generator 1012.

[0074] The multi-source circuit protection device 10 further includes: a first mounting cavity 104, a second mounting cavity 1021, and a cutting piston movable cavity 105. The lower edge of the first mounting cavity 104 is located directly above the upper cover of the cutting piston movable cavity 105. The second mounting cavity 1021 is located inside the cutting piston 102, and the upper edge of the second mounting cavity 1021 is located directly below the upper cover of the cutting piston movable cavity 105.

[0075] Optionally, the first mounting cavity 104 is a sealed chamber located outside the cut-off piston movable cavity 105. The first mounting cavity 104 is used to accommodate the first micro gas generator 1011. The first mounting cavity 104 is located directly above the upper cover of the cut-off piston movable cavity 105. The contact area between the first mounting cavity 104 and the upper cover of the cut-off piston movable cavity can share a weak layer, so that the high-pressure gas generated by the first micro gas generator 1011 under the active excitation trigger signal can smoothly enter the cut-off piston movable cavity 105.

[0076] Optionally, the second mounting cavity 1021 is a sealed chamber disposed inside the cut-off piston 102. The second mounting cavity 1021 is used to accommodate the second micro gas generator 1012, that is, in the initial state, the second micro gas generator 1012 is housed in the cut-off piston 102. When the high-pressure gas generated by the second micro gas generator 1012 under the passive excitation trigger signal completely fills the second mounting cavity 1021, the second micro gas generator 1012 detaches from the second mounting cavity 1021.

[0077] The first micro gas generator 1011 is located in the first mounting cavity 104, the second micro gas generator 1012 is located in the second mounting cavity 1021, and the cut-off piston 102 is located in the cut-off piston movable cavity 105.

[0078] In one alternative implementation, see [link to implementation details]. Figure 4 In the multi-source circuit protection device 10 provided in this application embodiment, the first micro gas generator 1011 in the micro gas generator module 101 has a package shell 1041. The first signal terminal of the first micro gas generator 1011 passes through the package shell 1041 and is connected to an external controller. The first micro gas generator 1011 receives the active excitation trigger signal sent by the external controller via the first signal terminal.

[0079] Optionally, the encapsulation shell 1041 is used to fix the first signal terminal of the first micro gas generator 1011 and the second signal terminal of the second micro gas generator 1012 in the first mounting cavity 104. The encapsulation shell 1041 can be a plastic shell, a silicone shell, etc., and this application does not make specific limitations in this regard.

[0080] The second signal terminal of the second micro gas generator 1012 passes through the encapsulation housing 1041 and is connected to the passive excitation signal line 103. The second micro gas generator 1012 obtains the passive excitation trigger signal from the passive excitation signal line 103 through the second signal terminal.

[0081] The movable chamber 105 of the cut-off piston is also provided with a limiting member 1051 for fixing the cut-off piston 102, and one end of the limiting member 1051 is connected to the cut-off piston 102.

[0082] Optionally, the limiting member 1051 is used to limit the initial position of the cutting piston 102 so that the cutting piston 102 will not affect the electrical energy of the main circuit conductor 20 when the main circuit conductor 20 is operating normally.

[0083] In one alternative implementation, see [link to implementation details]. Figure 5 A thin film is provided inside the first mounting cavity 104 near the bottom of the first micro gas generator 1011. The first operating state of the multi-source circuit protection device 10 provided in this application embodiment is as follows:

[0084] Optionally, the thin film is used to ensure that the cut-off piston movable chamber 105 is kept in a vacuum state when the multi-source circuit protection device 10 is in standby mode.

[0085] When the first signal terminal of the first micro gas generator 1011 receives the first trigger signal, it generates a first high-pressure gas under the action of the first trigger signal and breaks through the film. At the same time, the circuit between the passive excitation signal line 103 and the second signal terminal of the second micro gas generator 1012 is broken. The cut-off piston 102 and the second micro gas generator 1012 both move toward the main circuit conductive bus 20 under the action of the first high-pressure gas, so that the main circuit conductive bus 20 is disconnected under the impact force of the cut-off piston 102.

[0086] Optionally, the first trigger signal refers to the active excitation trigger signal sent when all processing links in the active excitation loop of the external controller are operating normally; the first high-pressure gas refers to the high-pressure gas generated by the first micro gas generator 1011 under the action of the first trigger signal, and the first high-pressure gas refers to the high-pressure gas sufficient to drive the cut-off piston 102 to completely cut off the main circuit conductive busbar 20.

[0087] Optionally, when the first signal terminal of the first micro gas generator 1011 receives the first trigger signal sent by the external control terminal, the first high-pressure gas generated by the first micro gas generator 1011 under the action of the first trigger signal will break through the membrane between the first mounting cavity 104 and the cutting piston moving cavity 105 and enter the cutting piston moving cavity 105. Due to the large impact force of the first high-pressure gas, the first high-pressure gas will push the cutting piston 102 to cut completely, which may cause the passive excitation signal line 103 to be pulled off or the main circuit conductive bus 20 to be disconnected. The passive excitation signal line 103 cannot collect the circuit fault signal from the main circuit conductive bus 20. The second micro gas generator 1012 is still contained in the second mounting cavity 1021 in the cutting piston 102. The second micro gas generator 1012 moves towards the main circuit conductive bus 20 under the push of the cutting piston 102 and the main circuit conductive bus 20 is disconnected under the impact of the cutting piston 102.

[0088] In one optional implementation, the second operating state of the multi-source circuit protection device 10 provided in this application embodiment is as follows:

[0089] When the first signal terminal of the first micro gas generator 1011 receives the second trigger signal, it generates a second high-pressure gas under the action of the second trigger signal and breaks through the membrane. Both the cut-off piston 102 and the second micro gas generator 1012 move toward the main circuit conductive busbar 20 under the action of the second high-pressure gas, and the circuit between the passive excitation signal line 103 and the second signal terminal is not broken.

[0090] Optionally, the second trigger signal refers to the active excitation trigger signal generated by the failure of a part of the active excitation loop of the external controller. The second high-pressure gas refers to the high-pressure gas generated by the first micro gas generator 1011 under the action of the second trigger signal. The second high-pressure gas is insufficient to drive the cut-off piston 102 to completely cut off the main circuit conductive busbar 20, that is, the driving force provided by the second high-pressure gas is insufficient. At this time, it is necessary to mobilize the passive excitation source. It is worth noting that the second trigger signal is lower than the first trigger signal, and the impact force of the second high-pressure gas is less than the impact force of the first high-pressure gas.

[0091] Optionally, when the first micro gas generator 1011 receives a second trigger signal sent by an external controller via a first signal terminal, the first micro gas generator 1011 generates a second high-pressure gas under the trigger of the second trigger signal. The second high-pressure gas can break through the membrane between the first mounting cavity 104 and the cutting piston movable cavity 105 and enter the cutting piston movable cavity 105. However, since the impact force provided by the second high-pressure gas is insufficient, the passive excitation source has not yet been activated. The second micro gas generator 1012 is still contained in the second mounting cavity 1021 in the cutting piston 102. The second micro gas generator 1012 moves a certain distance toward the main circuit conductive bus 20 under the action of the cutting piston 102 and the second signal terminal of the second micro gas generator 1012. However, the cutting piston 102 cannot completely cut off the main circuit conductive bus 20 at this time. The circuit between the passive excitation signal line 103 and the second signal terminal of the second micro gas generator 1012 will not be broken or the passive excitation signal line 103 will detect a circuit fault signal from the main circuit conductive bus 20.

[0092] When the circuit between the passive excitation signal line 103 and the second signal terminal is not broken, the passive excitation signal line 103 detects a circuit fault signal. The second signal terminal of the second micro gas generator 1012 receives a third trigger signal from the passive excitation signal line 103. Under the action of the third trigger signal, the second micro gas generator 1012 generates a third high-pressure gas. Under the action of the third high-pressure gas, the cut-off piston 102 continues to move toward the main circuit conductive busbar 20 to cut off the main circuit conductive busbar 20.

[0093] Optionally, the third trigger signal refers to the passive excitation trigger signal provided by the passive excitation signal line 103 when it is activated as a backup protection. The third high-pressure gas refers to the high-pressure gas provided by the second micro gas generator 1012 as a backup protection under the action of the third trigger signal. The third high-pressure gas continues to provide impact force to the cut-off piston 102 under the impact of the second high-pressure gas, which can ensure that the cut-off piston 102 can completely cut off the main circuit conductive busbar 20.

[0094] Optionally, the circuit fault signal refers to the electrical energy signal indicating that there is a circuit fault such as overcurrent or overload on the main circuit busbar 20.

[0095] Optionally, when the cutting piston 102 fails to completely cut off the main circuit conductive busbar 20 under the action of the second high-pressure gas generated by the first micro gas generator 1011, a passive excitation source is activated. The passive excitation signal line 103 can detect a circuit fault signal on the main circuit conductive busbar 20. The passive excitation signal line 103 takes a portion of the current from the main circuit conductive busbar 20 as a third trigger signal and sends it to the second signal terminal of the second micro gas generator 1012. Under the action of the third trigger signal, the second micro gas generator 1012 generates a third high-pressure gas. Under the action of the third high-pressure gas, the cutting piston 102 continues to move toward the main circuit conductive busbar 20, thereby completely cutting off the main circuit conductive busbar 20.

[0096] Among them, the transmission time of the active excitation trigger signal is shorter than that of the passive excitation trigger signal.

[0097] Optionally, the transmission time of the active excitation trigger signal refers to the reaction time of the external controller after detecting a circuit fault in the main circuit busbar 20, and the transmission time of the passive excitation trigger signal refers to the feedback time of the passive excitation signal line after detecting a circuit fault in the main circuit busbar 20, from drawing power from the main circuit busbar 20 to feeding back to the second signal terminal of the micro gas generator module 101.

[0098] Optionally, the transmission time of the active excitation trigger signal is shorter than that of the passive excitation trigger signal, indicating that the external controller reacts more quickly to the circuit fault of the main circuit busbar 20. The multi-source circuit protection device 10 is preferentially triggered by the active excitation trigger signal to cut off the main circuit busbar 20 with the circuit fault. The passive excitation trigger signal is used to perform a secondary cutting impact on the main circuit busbar 20 that is not completely cut off under the action of the active excitation trigger signal, so as to ensure the cutting-off effect of the multi-source circuit protection device 10 on the main circuit busbar 20.

[0099] In one alternative implementation, see [link to implementation details]. Figure 6 The third operating state of the multi-source circuit protection device 10 provided in this application embodiment is as follows:

[0100] When the first signal terminal of the first micro gas generator 1011 does not receive a trigger signal from the external controller, or when the first micro gas generator 1011 fails to break through the membrane after receiving the trigger signal from the external controller, the circuit between the passive excitation signal line 103 and the second signal terminal of the second micro gas generator 1012 is connected. The passive excitation signal line 103 detects a circuit fault signal, and the second signal terminal of the second micro gas generator 1012 obtains a fourth trigger signal from the passive excitation signal line 103. Under the action of the fourth trigger signal, the second micro gas generator 1012 generates a fourth high-pressure gas, and the cut-off piston 102 moves toward the main circuit conductive busbar 20 under the action of the fourth high-pressure gas to cut off the main circuit conductive busbar 20.

[0101] Optionally, the trigger signal refers to an invalid active excitation trigger signal issued by a partial processing stage in the active excitation loop of the external controller due to an error; the fourth trigger signal refers to a passive excitation trigger signal directly taken from the main circuit conductive busbar 20 by the passive excitation signal line 103 when the active excitation trigger signal is completely invalid; the fourth high-pressure gas refers to the high-pressure gas generated by the second micro gas generator 1012 under the action of the fourth trigger signal; the fourth high-pressure gas refers to the high-pressure gas sufficient to drive the cut-off piston 102 to completely cut off the main circuit conductive busbar 20.

[0102] Optionally, the fourth trigger signal is greater than the third trigger signal, and the impact force generated by the fourth high-pressure gas is greater than the impact force generated by the third high-pressure gas.

[0103] Optionally, when the active excitation loop of the external controller fails to generate an active excitation trigger signal or the generated active excitation trigger signal is invalid, that is, when the first micro gas generator 1011 fails to break through the membrane between the first mounting cavity 104 and the cutting piston movable cavity 105 under the action of the active excitation trigger signal sent by the external controller, the passive excitation is directly started. The passive excitation signal line 103 can collect the circuit fault signal from the main circuit conductive busbar 20. The passive excitation signal line 103 takes a portion of the current flowing through the main circuit conductive busbar 20 as the fourth trigger signal and sends it to the second signal terminal of the second micro gas generator 1012. Under the action of the fourth trigger signal, the second micro gas generator 1012 generates a fourth high-pressure gas. Under the action of the fourth high-pressure gas, the cutting piston 102 moves toward the main circuit conductive busbar 20 to cut off the main circuit conductive busbar 20.

[0104] Among them, the transmission time of the active excitation trigger signal is shorter than that of the passive excitation trigger signal.

[0105] An alternative implementation method is described in [reference]. Figure 4The multi-source circuit protection device 10 provided in this application embodiment is installed on the main circuit conductive busbar 20. The main circuit conductive busbar 20 is a copper busbar of a preset thickness. The main circuit conductive busbar 20 between the limiting member 1051 and the cutting piston 102 is the weak area of ​​the main circuit conductive busbar 20.

[0106] Optionally, the main circuit conductive bar 20, which is the space between the limiting member 1051 and the cutting piston 102, is selected in the weak area of ​​the main circuit conductive bar 20, which can ensure the cutting effect of the multi-source circuit protection device 10.

[0107] In one alternative implementation, see [link to implementation details]. Figure 4 The cut-off piston 102 in the multi-source circuit protection device 10 provided in this application embodiment also includes a storage tank 1022.

[0108] When both the cut-off piston 102 and the second micro gas generator 1012 move downward under the action of the first high-pressure gas, the signal line of the second signal terminal of the second micro gas generator 1012 is pulled out from the storage tank 1022 so that the second micro gas generator 1012 can obtain the third trigger signal from the passive excitation signal line 103.

[0109] Optionally, when the second micro gas generator 1012 is not activated, the signal line of the second signal terminal of the second micro gas generator 1012 can be stored in the storage groove 1022 in the cut-off piston 102; when the second micro gas generator 1012 is activated, the signal line of the second signal terminal of the second micro gas generator 1012 can be extracted from the storage groove 1022 in the cut-off piston 102, thus saving the volume of the multi-source circuit protection device 10.

[0110] An alternative implementation method is described in [reference]. Figure 4 The multi-source circuit protection device 10 provided in this application embodiment further includes: a first plug-in terminal 411 and a second plug-in terminal 412, both of which are disposed on the upper surface of the encapsulation housing 1041.

[0111] The active excitation trigger signal line of the external controller is connected to the first signal terminal of the first micro gas generator 1011 through the first plug-in terminal 411, and the passive excitation signal line 103 is connected to the second signal terminal of the second micro gas generator 1012 through the second plug-in terminal 412.

[0112] Figure 7 A schematic diagram of a circuit system provided in this application is shown below. Figure 7 The circuit system provided in this application includes the multi-source circuit protection device 10 described above. The working principle of the multi-source circuit protection device 10 in the circuit system is the same as that in the above embodiment, and this application does not make any specific limitations on it.

[0113] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0114] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A multi-source circuit protection device, characterized in that, The multi-source circuit protection device includes: a miniature gas generator module and a cut-off piston; The micro gas generator module is located on top of the cut-off piston, which is located on top of the main circuit conductive busbar, and there is a preset distance between the bottom of the cut-off piston and the upper surface of the main circuit conductive busbar. The first signal terminal of the micro gas generator module is connected to an external controller, and the micro gas generator module receives an active excitation trigger signal sent by the external controller through the first signal terminal; The second signal terminal of the micro gas generator module is connected to the passive excitation signal line, which is also connected to the main circuit busbar. The micro gas generator module obtains the passive excitation trigger signal from the passive excitation signal line through the second signal terminal. The micro gas generator module is used to generate high-pressure gas under the triggering of the active excitation trigger signal and / or the passive excitation trigger signal, so as to push the cut-off piston toward the main circuit conductive busbar to cut off the main circuit conductive busbar.

2. The multi-source circuit protection device according to claim 1, characterized in that, The micro gas generator module includes: a first micro gas generator and a second micro gas generator; The multi-source circuit protection device further includes: a first mounting cavity, a second mounting cavity, and a cutting piston movable cavity. The lower edge of the first mounting cavity is located directly above the upper cover of the cutting piston movable cavity. The second mounting cavity is located inside the cutting piston, and the upper edge of the second mounting cavity is located directly below the upper cover of the cutting piston movable cavity. The first micro gas generator is located in the first mounting cavity, the second micro gas generator is located in the second mounting cavity, and the cut-off piston is located in the cut-off piston movable cavity.

3. The multi-source circuit protection device according to claim 2, characterized in that, The first micro gas generator has an encapsulation shell. The first signal terminal of the first micro gas generator passes through the encapsulation shell and is connected to an external controller. The first micro gas generator receives an active excitation trigger signal sent by the external controller via the first signal terminal. The second signal terminal of the second micro gas generator passes through the encapsulation shell and is connected to the passive excitation signal line. The second micro gas generator obtains the passive excitation trigger signal from the passive excitation signal line via the second signal terminal. The movable chamber of the cutting piston is also provided with a limiting member for fixing the cutting piston, and one end of the limiting member is connected to the cutting piston.

4. The multi-source circuit protection device according to claim 3, characterized in that, A thin film is provided inside the first mounting cavity near the bottom of the first micro gas generator; When the first signal terminal of the first micro gas generator receives the first trigger signal, it generates a first high-pressure gas under the action of the first trigger signal and breaks through the film. At the same time, the circuit between the passive excitation signal line and the second signal terminal of the second micro gas generator is broken. The cut-off piston and the second micro gas generator move toward the main circuit busbar under the action of the first high-pressure gas, so that the main circuit busbar is disconnected under the impact force of the cut-off piston.

5. The multi-source circuit protection device according to claim 4, characterized in that, When the first signal terminal of the first micro gas generator receives the second trigger signal, it generates a second high-pressure gas under the action of the second trigger signal and breaks through the film. The cut-off piston and the second micro gas generator move toward the main circuit busbar under the action of the second high-pressure gas, and the circuit between the passive excitation signal line and the second signal terminal is not broken. When the circuit between the passive excitation signal line and the second signal terminal is not broken, the passive excitation signal line detects a circuit fault signal, the second signal terminal of the second micro gas generator obtains a third trigger signal from the passive excitation signal line, the second micro gas generator generates a third high-pressure gas under the action of the third trigger signal, and the cut-off piston continues to move toward the main circuit conductive busbar under the action of the third high-pressure gas to cut off the main circuit conductive busbar; The transmission time of the active excitation trigger signal is shorter than that of the passive excitation trigger signal.

6. The multi-source circuit protection device according to claim 3, characterized in that, When the first signal terminal of the first micro gas generator does not receive a trigger signal from the external controller, or when the first micro gas generator fails to break through the membrane after receiving a trigger signal from the external controller, the circuit between the passive excitation signal line and the second signal terminal of the second micro gas generator is connected. The passive excitation signal line detects a circuit fault signal. The second signal terminal of the second micro gas generator receives a fourth trigger signal from the passive excitation signal line. Under the action of the fourth trigger signal, the second micro gas generator generates a fourth high-pressure gas. Under the action of the fourth high-pressure gas, the cut-off piston moves toward the main circuit conductive busbar to cut off the main circuit conductive busbar. The transmission time of the active excitation trigger signal is shorter than that of the passive excitation trigger signal.

7. The multi-source circuit protection device according to claim 3, characterized in that, The main circuit conductive busbar is a copper busbar of a preset thickness, and the main circuit conductive busbar between the limiting member and the cutting piston is the weak area of ​​the main circuit conductive busbar.

8. The multi-source circuit protection device according to claim 4, characterized in that, The cut-off piston further includes: a storage tank; When both the cut-off piston and the second micro gas generator move downwards under the action of the first high-pressure gas, the signal line of the second signal terminal of the second micro gas generator is pulled out from the storage tank, so that the second micro gas generator can obtain a third trigger signal from the passive excitation signal line.

9. The multi-source circuit protection device according to claim 3, characterized in that, The multi-source circuit protection device further includes: a first plug-in terminal and a second plug-in terminal, both of which are disposed on the upper surface of the encapsulation housing; The active excitation trigger signal line of the external controller is connected to the first signal terminal of the first micro gas generator through the first plug-in terminal, and the passive excitation signal line is connected to the second signal terminal of the second micro gas generator through the second plug-in terminal.

10. A circuit system, characterized in that, The circuit system includes: the multi-source circuit protection device according to any one of claims 1-9.

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