Synchronous trigger fuse control circuit and synchronous trigger fuse

Abstract

The application provides a synchronous trigger fuse control circuit and a synchronous trigger fuse, which comprise an internal trigger module and an external trigger module; the external trigger module is connected to a conductor of the synchronous trigger fuse and is used for receiving an external trigger signal; when the external trigger signal is received or an internal trigger signal on the conductor is collected, a first ignition device is triggered to cut off the conductor to cut off a protected circuit; the internal trigger module is connected to the conductor of the synchronous trigger fuse and is used for triggering a second ignition device to cut off the conductor to cut off the protected circuit when the internal trigger signal on the conductor is collected; or the second ignition device is triggered to cut off the conductor to cut off the protected circuit according to a second current generated after the conductor is cut off. Through the synchronous trigger mechanism, the first ignition device and the second ignition device can be triggered, and the problem that there is still an ignition device with gunpowder left after the fuse ends the protection action is solved.

Description

Technical Field

[0001] This application belongs to the field of emergency protection device technology, specifically relating to a synchronous trigger fuse control circuit and a synchronous trigger fuse. Background Technology

[0002] With the rapid development of new energy vehicles towards higher voltage and higher power, and the gradual popularization of 800V and above voltage platforms, the rated current carrying capacity of core high-voltage circuits such as battery pack main circuits and electric drive systems is constantly increasing. This places stringent requirements on the reliability, breaking performance, and intelligence level of circuit protection devices. As a core protection component of the high-voltage circuit in new energy vehicles, intelligent fuses integrate the overcurrent protection function of traditional fuses with intelligent monitoring, prediction, and control capabilities. They can collect circuit current signals in real time, enabling fault prediction, precise fault breaking, and fault data feedback. Widely used in key scenarios such as the main circuit of new energy vehicle battery packs, high-voltage distribution boxes, and charging / discharging circuits, they are the last crucial line of defense for ensuring the safe and stable operation of the high-voltage system in new energy vehicles. Their performance directly determines the safety and reliability of the entire vehicle's high-voltage system, aligning with the development trend of high voltage and intelligence in new energy vehicles.

[0003] Currently, smart fuses with integrated active and passive protection typically employ two ignition devices, one responsible for external triggering and the other for internal triggering. However, under normal circumstances, only one ignition device is activated during the protection action of a smart fuse. This means that either an external control signal triggers the external ignition tube, or an internal control signal triggers the internal ignition tube. It is rare for both ignition devices to trigger simultaneously. This results in one intact ignition tube remaining inside the smart fuse, and the residual propellant within it poses a significant safety hazard during product recovery. Summary of the Invention

[0004] This application provides a synchronous trigger fuse control circuit and a synchronous trigger fuse, which aims to enable both the first ignition device and the second ignition device to be triggered under abnormal operating conditions through a synchronous trigger mechanism, thereby solving the problem that there are still gunpowder-containing ignition devices inside the intelligent fuse product after it is scrapped due to protection action.

[0005] In a first aspect, this application provides a synchronous trigger fuse control circuit, including an internal trigger module and an external trigger module; the external trigger module is connected to the conductor of the synchronous trigger fuse and is used to receive an external trigger signal, and when receiving the external trigger signal or acquiring an internal trigger signal on the conductor, triggering a first ignition device to cut off the conductor to cut off the protected circuit; the internal trigger module is connected to the conductor of the synchronous trigger fuse and is used to trigger a second ignition device to cut off the conductor to cut off the protected circuit when acquiring an internal trigger signal on the conductor; or, based on a second current generated after the conductor is cut off, triggering the second ignition device to cut off the conductor to cut off the protected circuit.

[0006] In conjunction with the first aspect, in one possible embodiment, the synchronous trigger fuse includes at least one first ignition device, at least one second ignition device, at least one first impact element and at least one second impact element, at least one conductor and an arc-extinguishing fuse. The conductor is provided with a signal fuse, at least one first pre-cutoff portion, and at least one second pre-cutoff portion connected sequentially. The two ends of the arc-extinguishing fuse are respectively connected to the conductor. The internal trigger module includes a first current-limiting unit and a second current-limiting unit. The first ends of the first current-limiting units are all used to connect to the negative terminal of the second ignition device. The second ends of the first current-limiting units are used to connect to the first end of the second pre-cutoff portion. The positive terminal of the second ignition device is connected to the first end of the signal fuse. The first end of the first pre-cutoff portion is connected to the signal fuse. The second end of the first pre-cut-off portion is connected to the second end of the second pre-cut-off portion; wherein, the first current limiting unit is used to limit the second current flowing through the second ignition device to less than the internal trigger current of the second ignition device under normal conditions, and to limit the second current to greater than or equal to the internal trigger current when the first pre-cut-off portion is cut off; the first ends of the second current limiting units are all used to connect to the negative terminal of the second ignition device; the second end of the second current limiting unit is used to connect between the second end of the signal fuse and the first end of the first pre-cut-off portion; wherein, the second current limiting unit is used to limit the first current flowing through the second ignition device to less than the trigger current under normal conditions, and to limit the first current to greater than or equal to the trigger current when an abnormal current is generated.

[0007] In conjunction with the first aspect, in one possible embodiment, a first overcurrent protection unit is included, which is connected between the first end of the second pre-cut-off section and the first current limiting unit, for cutting off the circuit between the second pre-cut-off section and the second ignition device when the current is greater than a preset threshold.

[0008] In conjunction with the first aspect, in one possible embodiment, the synchronous trigger fuse includes at least one first ignition device, at least one second ignition device, at least one first impact member and at least one second impact member, at least one conductor and an arc-extinguishing fuse. The conductor is provided with a signal fuse, at least one first pre-cut-off portion and at least one second pre-cut-off portion connected sequentially. The two ends of the arc-extinguishing fuse are respectively connected to the conductor. The external trigger module includes a rectifier protection unit and a high-low voltage isolation unit. The high-low voltage isolation unit is used to collect the internal trigger signals from both ends of the signal fuse and isolate and transmit them to the rectifier protection unit. The rectifier protection unit is used to unidirectionally transmit the internal trigger signals to the first ignition device. The rectifier protection unit is also used to prevent external trigger signals from being transmitted to the high-low voltage isolation unit.

[0009] In conjunction with the first aspect, in one possible embodiment, the high-low voltage isolation unit includes a transformer; a first end of the high-voltage side of the transformer is connected to a first end of the signal fuse, and a second end of the high-voltage side of the transformer is connected to a second end of the signal fuse; a first end of the low-voltage side of the transformer is connected to the input end of the rectifier protection unit, and a second end of the low-voltage side of the transformer is connected to the negative terminal of an external device.

[0010] In conjunction with the first aspect, in one possible embodiment, the high-low voltage isolation unit further includes a second overcurrent protection unit; the second overcurrent protection unit is connected between the high-voltage side of the transformer and the signal fuse, and is used to disconnect the circuit connection between the transformer and the signal fuse when the internal trigger signal is greater than a first preset value, so as to prevent the internal trigger signal greater than the first preset value from being transmitted to external devices.

[0011] In one possible embodiment, the rectifier protection unit includes a first diode; the input terminal of the first diode is connected to a first terminal of the low-voltage side of the transformer, and the output terminal of the first diode is connected to the positive terminal of the first ignition device.

[0012] Secondly, this application also provides a synchronously triggered fuse, including a fuse housing, wherein the fuse housing is provided with a synchronously triggered fuse control circuit as described in the first aspect; wherein the fuse housing is provided with a first receiving chamber, a second receiving chamber, at least one first movable chamber, and at least one second movable chamber; an external trigger circuit board is provided in the first receiving chamber, and an internal trigger circuit board is provided in the second receiving chamber; the internal trigger circuit board is provided with an internal trigger module, and the external trigger circuit board is provided with an external trigger module; at least one first ignition device and at least one first impact member are provided in the first movable chamber, and the at least one first pre-cut-off portion is disposed on the impact path of the at least one first impact member; at least one second ignition device and at least one second impact member are provided in the second movable chamber, and the at least one second pre-cut-off portion is disposed on the impact path of the at least one second impact member.

[0013] In conjunction with the second aspect, in one possible embodiment, the fuse housing further includes an arc-extinguishing chamber and one or more third receiving chambers. The arc-extinguishing chamber contains an arc-extinguishing fusible element and is filled with an arc-extinguishing medium encapsulating the fusible element. The two ends of the fusible element are respectively connected to a first end of the second pre-cutting portion and a first end of the first pre-cutting portion. The third receiving chamber contains a third impact member, which has a first fixing portion, and the fusible element is fixed to the first fixing portion. The third receiving chamber has a third opening, which is located in the third impact direction of the third impact member. When the first or second impact member impacts along the third impact direction, it enters the third receiving chamber through the corresponding third opening to impact the third impact member, thereby breaking the fusible element fixed to the first fixing portion.

[0014] In conjunction with the second aspect, in one possible embodiment, the fuse housing is further provided with a fourth receiving chamber for housing a protection unit; the fourth receiving chamber is provided with a first channel communicating with a first end of the second pre-cut-off portion and a second channel communicating with the first receiving chamber; the protection unit is connected to the internal triggering module through the second channel, and the protection unit is connected to the first end of the second pre-cut-off portion through the first channel.

[0015] As can be seen, the synchronous trigger fuse control circuit in this application includes an internal trigger module and an external trigger module. The external trigger module is connected to the conductor of the synchronous trigger fuse and is used to receive external trigger signals. When it receives an external trigger signal or collects an internal trigger signal on the conductor, it triggers the first ignition device to cut off the conductor and thus disconnect the protected circuit. The internal trigger module is connected to the conductor of the synchronous trigger fuse and is used to trigger the second ignition device to cut off the conductor and thus disconnect the protected circuit when it collects an internal trigger signal on the conductor; or, based on the second current generated after the conductor is cut off, it triggers the second ignition device to cut off the conductor and thus disconnect the protected circuit. In this way, through the synchronous trigger mechanism, both the first and second ignition devices can be triggered under abnormal operating conditions, solving the problem that there are still gunpowder-containing ignition devices remaining inside the intelligent fuse product after it has been scrapped due to a protection action. At the same time, multiple ignition devices are triggered simultaneously, forming multiple breaks on the conductor, which enables rapid disconnection of the main circuit, speeds up the arc extinguishing time, and further improves the breaking capacity of the smart fuse and the insulation resistance after disconnection. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic block diagram of the synchronous trigger fuse control circuit provided in the embodiments of this application; Figure 2 This is a schematic block diagram of the structure of each unit of the synchronous trigger fuse control circuit provided in the embodiments of this application; Figure 3 This is a circuit diagram of the first synchronously triggered fuse control circuit provided in the embodiments of this application; Figure 4 This is a circuit diagram of the second synchronously triggered fuse control circuit provided in the embodiments of this application; Figure 5 This is a schematic diagram of the synchronous trigger fuse provided in the embodiments of this application; Figure 6 This is a schematic diagram of the structure of the third impact member provided in the embodiments of this application; Figure 7 This is a schematic diagram of the structure of the first type of third impact member and arc-extinguishing melt provided in the embodiments of this application; Figure 8This is a schematic diagram of the structure of the second type of third impact member and the arc-extinguishing melt provided in the embodiments of this application; Figure 9 This is a schematic diagram showing the positions of the first protection unit and the fourth accommodating chamber provided in the embodiments of this application; Figure 10 This is a schematic diagram showing the positions of the second protection unit and the fourth accommodating chamber provided in the embodiments of this application; Figure 11 This is a schematic diagram showing the location of the third protection unit and the fourth accommodating chamber provided in the embodiments of this application. Detailed Implementation

[0018] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0019] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, systems, products, or apparatuses.

[0020] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0021] Currently, smart fuses with integrated active and passive protection functions typically employ two ignition devices, one responsible for external triggering and the other for internal triggering. However, under normal circumstances, only one ignition device is activated during the protection action of a smart fuse. This means that either an external control signal triggers the external ignition tube, or an internal control signal triggers the internal ignition tube. It is rare for both ignition devices to trigger simultaneously. This results in one intact ignition tube remaining inside the smart fuse, and the residual propellant within it poses a significant safety hazard during product recovery.

[0022] To address the aforementioned problems, this application provides a synchronous trigger fuse control circuit and a synchronous trigger fuse. This synchronous trigger fuse control circuit and synchronous trigger fuse can be applied to scenarios where internal and external fuse mechanisms are triggered synchronously. The synchronous trigger fuse control circuit in this application includes an internal trigger module and an external trigger module. The external trigger module is connected to the conductor of the synchronous trigger fuse and is used to receive an external trigger signal. Upon receiving the external trigger signal or acquiring an internal trigger signal on the conductor, it triggers a first ignition device to cut off the conductor and thus disconnect the protected circuit. The internal trigger module is connected to the conductor of the synchronous trigger fuse and is used to trigger a second ignition device to cut off the conductor and thus disconnect the protected circuit upon acquiring an internal trigger signal on the conductor; or, based on a second current generated after the conductor is cut off, it triggers the second ignition device to cut off the conductor and thus disconnect the protected circuit. This solution can be applied to various scenarios, including but not limited to the application scenarios mentioned above.

[0023] The specific methods will be described in detail below.

[0024] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 This application also provides a synchronous trigger fuse control circuit 100, including an internal trigger module 10 and an external trigger module 20; the external trigger module 20 is connected to the conductor of the synchronous trigger fuse and is used to receive an external trigger signal, and when receiving the external trigger signal or acquiring an internal trigger signal on the conductor, triggering a first ignition device to cut off the conductor to cut off the protected circuit; the internal trigger module 10 is connected to the conductor of the synchronous trigger fuse and is used to trigger a second ignition device to cut off the conductor to cut off the protected circuit when acquiring an internal trigger signal on the conductor; or, based on a second current generated after the conductor is cut off, triggering the second ignition device to cut off the conductor to cut off the protected circuit.

[0025] Specifically, the synchronous trigger fuse includes at least one first ignition device, at least one second ignition device, at least one first impact member and at least one second impact member, at least one conductor and an arc-extinguishing fuse. The conductor is provided with a signal fuse, at least one first pre-cut-off part and at least one second pre-cut-off part connected in sequence. The two ends of the arc-extinguishing fuse are respectively connected to the conductor.

[0026] In a specific implementation, the conductor serves as the main conductive path connecting the fuse and the protected circuit in series, with both the internal trigger module 10 and the external trigger module 20 connected to this main conductive path. Optionally, the main body of the conductor can be composed of a first conductive bus and a second conductive bus, with at least one first pre-cutting portion and at least one second pre-cutting portion disposed on the first conductive bus, and the signal fusible element bridging the first and second conductive bus, thus obtaining a complete conductor. The first and second pre-cutting portions are both easily cut structures with an overall size smaller than other locations on the first conductive bus after a thinning process. Optionally, the conductor can also be an integrally formed structure, obtained by fabricating at least one first pre-cutting portion 31, at least one second pre-cutting portion 32, and the signal fusible element RR on a single conductor.

[0027] It is understood that the first ignition device 231, the first impact member 232, and the first pre-cutting part 31 form a first fusion structure. The number of these three components in each group of first fusion structures can be one-to-one or different, and there is no requirement for uniqueness here. Similarly, the second ignition device 241, the second impact member 242, and the second pre-cutting part 32 form a second fusion structure. The number of these three components in each group of second fusion structures can be one-to-one or different, and there is no requirement for uniqueness here.

[0028] Both the external trigger module 20 and the internal trigger module 10 are connected to both ends of the signal melt. By collecting the arc voltage generated after the signal melt melts, the internal trigger signals of the first ignition device and the second ignition device are used. Then, when the signal melt melts, the first ignition device and the second ignition device explode to generate explosive gas, which pushes the first impact member and the second impact member to break the first pre-cut-off part and the second pre-cut-off part, respectively, so as to complete the cut-off of the main conductive path and thus de-energize the protected circuit. In addition, the external trigger module 20 is also connected to an external device. By receiving an external trigger signal output by the external device, it detonates the first ignition device. Then, the explosive gas generated by the first ignition device pushes the first impact member to cut off the first pre-cut-off section, thereby disconnecting the conductor. At this time, part of the current between the first pre-cut-off section 31 and the second pre-cut-off section 32 is diverted to the internal trigger module 10, so that the current in the internal trigger module 10 reaches the triggering condition of the second ignition device 241. Thus, the second ignition device 241 is triggered after the first pre-cut-off section 31 is disconnected. After the second ignition device 241 is triggered and detonated, it generates high-pressure gas that pushes the second impact member 242 toward the second pre-cut-off section 32, cutting off the second pre-cut-off section 32.

[0029] As can be seen, in this embodiment, the first and second ignition devices can be detonated simultaneously by an internal trigger signal, or the first ignition device can be detonated first by an external trigger signal, and then the second ignition device can be detonated by the arc voltage generated by the first ignition device cutting off the conductor to cut off the conductor a second time. In this way, all ignition devices can be triggered by either internal or external triggering, which solves the problem that there are still ignition devices with gunpowder inside the intelligent fuse product after it is scrapped due to protection action.

[0030] In addition, forming at least two sets of breaks on the conductor quickly increases the insulation distance on the conductor, promotes the rapid transfer of current on the conductor to the arc-extinguishing melt 271, and reduces the ablation time of the arc-extinguishing melt 271 itself under large short-circuit current.

[0031] In one possible embodiment, the internal trigger module 10 includes a first current limiting unit and a second current limiting unit; the first end of each of the first current limiting units is connected to the negative terminal of the second ignition device; the second end of each of the first current limiting units is connected to the first end of the second pre-cutoff portion; the positive terminal of the second ignition device is connected to the first end of the signal fuse; the first end of the first pre-cutoff portion is connected to the second end of the signal fuse, and the second end of the first pre-cutoff portion is connected to the second end of the second pre-cutoff portion; wherein, the first current limiting unit is used to limit the second current flowing through the second ignition device to less than the internal trigger current of the second ignition device under normal conditions, and to limit the second current to greater than or equal to the internal trigger current when the first pre-cutoff portion is cut off; the first end of each of the second current limiting units is connected to the negative terminal of the second ignition device; the second end of each of the second current limiting units is connected between the second end of the signal fuse and the first end of the first pre-cutoff portion; wherein, the second current limiting unit is used to limit the first current flowing through the second ignition device to less than the trigger current under normal conditions, and to limit the first current to greater than or equal to the trigger current when an abnormal current is generated.

[0032] Specifically, the first current limiting unit 11 includes a first resistor R1 and a second resistor R2. The first end of the first resistor R1 and the first end of the second resistor R2 are both used to connect to the negative terminal of the second ignition device 241. The second end of the first resistor R1 and the second end of the second resistor R2 are both used to connect to the first end of the second pre-cutoff section 32. This makes the first current limiting unit 11 connected in series between the second ignition device 241 and the first end of the second pre-cutoff section 32, forming a first trigger sub-circuit in parallel with the second ignition device 241 and the circuit formed by the signal fuse RR, the first pre-cutoff section 31 and the second pre-cutoff section 32. At the same time, the first current limiting unit 11 limits the current flowing through the second ignition device 241.

[0033] Optionally, the first end of the arc-extinguishing melt 271 can be connected between the first end of the first pre-cutting section 31 and the second end of the signal melt RR, and the second end of the arc-extinguishing melt 271 can be connected to the first end of the second pre-cutting section 32; alternatively, the first end of the arc-extinguishing melt 271 can also be connected to the first end of the signal melt RR, without being limited to a single point.

[0034] It is understandable that the first resistor R1 and the second resistor R2 are connected in parallel between the first end of the second ignition device 241 and the second pre-cut-off part 32, and the first resistor R1 and the second resistor R2 serve as backups for each other to prevent the failure of one of the resistors from causing the first current limiting unit 11 to fail.

[0035] In specific implementation, since the second ignition device 241 is connected to the first end of the signal fuse RR and the first end of the second pre-cut-off part 32, the voltage on the second ignition device 241 is actually the voltage on the conductor. Under normal conditions, since the resistance of the first current limiting unit 11 is much greater than that of the conductor, the current on the second ignition device 241 is much smaller than that of the conductor, and the second ignition device 241 will not be triggered. When the first pre-cut-off part 31 is cut off, the conductor is disconnected, so that the current is transferred to the circuit of the second ignition device 241, causing the second current in the circuit to increase to be greater than or equal to the internal trigger current, the second ignition device 241 is triggered, and then pushes the second impact member 242 to cut off the second pre-cut-off part 32, forming at least two sets of breaks on the conductor, quickly opening the insulation distance on the conductor, promoting the rapid transfer of the current on the conductor to the arc-extinguishing fuse 271, and reducing the ablation time of the arc-extinguishing fuse 271 itself under large short-circuit current.

[0036] Furthermore, the second current limiting unit 12 includes a third resistor R3 and a fourth resistor R4. The first ends of the third resistor R3 and the fourth resistor R4 are both used to connect to the negative terminal of the second ignition device 241. The second ends of the third resistor R3 and the fourth resistor R4 are both used to connect between the second end of the signal fuse RR and the first end of the first pre-cut-off section 31. This makes the second current limiting unit 12 connected in series between the second ignition device 241 and the second end of the signal fuse RR, forming a second trigger sub-circuit connected in parallel with the signal fuse RR. At the same time, the second current limiting unit 12 limits the first current flowing through the second ignition device 241.

[0037] In the specific implementation, when the signal fuse RR is melted due to abnormal current, a high-voltage arc is generated, which makes the first current in the second trigger sub-circuit greater than or equal to the internal trigger current of the second ignition device 241. This causes the second ignition device 241 to be ignited and generate high-pressure gas to push the second impact member 242 to cut off the second pre-cutting part 32, forming at least two sets of breaks on the conductor. This quickly increases the insulation distance on the conductor, promotes the rapid transfer of current on the conductor to the arc-extinguishing fuse 271, and reduces the ablation time of the arc-extinguishing fuse 271 itself under large short-circuit current.

[0038] As can be seen, in this embodiment, a second current limiting unit 12 is set on the basis of the first current limiting unit 11, so that the second ignition device 241 can be triggered by both an external trigger signal and the melting arc of the signal fuse RR. Under the premise of ensuring that the synchronous trigger fuse 200 can be triggered under any circumstances, the ability to form a multi-break accelerated transfer arc is increased.

[0039] The second ignition device 241 of the synchronous trigger fuse 200 of this application can not only be detonated by the trigger current provided by the arc voltage generated by the melting of the signal fuse RR, but also be detonated successively by the trigger current provided by the arc voltage generated by the first pre-cut-off part 31 after the first ignition device 231 is detonated by the corresponding first impact member 232 cutting off the first pre-cut-off part 31 after the external trigger signal detonates the first ignition device 231.

[0040] Similarly, when the synchronous trigger fuse 200 of this application is tested by external triggering, it can not only detonate the first ignition device 231 by an externally provided control signal (i.e., an external trigger signal), but also detonate the second ignition device 241 in succession by the triggering of the first ignition device 231, thereby forming two sets of breaks on the conductor, quickly opening the insulation distance on the conductor, promoting the rapid transfer of current on the conductor to the arc-extinguishing fuse 271, and reducing the ablation time of the arc-extinguishing fuse 271 itself under large short-circuit current.

[0041] In one possible embodiment, the internal trigger module 10 may further include a voltage-controlled switch unit, which is composed of a group of unidirectional conducting diodes connected in parallel. A group refers to one unidirectional conducting diode or two or more unidirectional conducting diodes connected in parallel as backups of each other. The first end of the voltage-controlled switch unit is connected to a first conductive bus near the second end of the signal fuse (i.e., between the signal fuse and the first pre-cut-off portion), and the second end of the voltage-controlled switch unit is connected to the second end of the second current-limiting unit, i.e., the voltage-controlled switch unit is connected between the second current-limiting unit and the first conductive bus.

[0042] In one possible embodiment, a first overcurrent protection unit is included, which is connected between the first end of the second pre-cut-off section and the first current limiting unit, for cutting off the circuit between the second pre-cut-off section and the second ignition device when the current is greater than a preset threshold.

[0043] In a specific implementation, the first end of the first current limiting unit 11 is connected to the first end of the second ignition device 241, and the second end of the first current limiting unit 11 is connected to the first end of the protection unit 13. The second end of the protection unit 13 is used to connect to the first end of the second pre-cut-off part 32 (i.e., the end away from the first pre-cut-off part 31 and the signal fuse RR) to limit the magnitude of the second current when the conductor shunts the current to the internal trigger module 10.

[0044] Specifically, the protection unit 13 includes a first fuse F1, which may be a fast-blow low-current fuse. One end of the first fuse F1 is connected to the second end of the first current limiting unit 11, and the other end is connected to the first end of the second pre-cut-off section 32. This fuse F1 is used to cut off the circuit between the second pre-cut-off section 32 and the second ignition device 241 when the current exceeds a preset threshold, preventing the internal trigger circuit board 221 from continuously burning under high voltage and high current. The rated current of the first overcurrent protection unit is determined by the current limiting capability of the second current limiting protection unit.

[0045] It is understandable that, for the second trigger sub-circuit formed by the first current limiting unit 11 and the second ignition device 241, the second current flowing through the second trigger sub-circuit must first reach the triggering condition of the second ignition device 241 and ignite the second ignition device 241, and then cause the first fuse F1 in the protection unit 13 to melt and cut off the branch. Therefore, the selection of the first fuse F1 in the protection unit 13 must meet the requirement that the rated voltage is the same as the rated voltage of the synchronous trigger fuse 200, and the melting energy must be greater than the energy required for the second ignition device 241 to detonate, so as to ensure that the protection unit 13 melts after the second ignition device 241 detonates.

[0046] In one possible embodiment, the external trigger module 20 includes a connection structure unit 230 for connecting to an external device. Optionally, the connection structure unit 230 includes a socket J1, which can be a male connector socket. When using the synchronous trigger fuse 200 of this application, the female connector socket with connecting wires is inserted into the male connector socket to complete the access of the external control signal of the product. The socket J1 can also be a connecting piece. When using the synchronous trigger fuse 200 of this application, the connecting piece is inserted into or soldered to a fixed base connected to the external control signal connecting wire to complete the access of the external control signal of the product. The two pins of the connection structure unit 230 can be directly connected to the two pins (i.e., the positive and negative terminals) of the first ignition device so that the external trigger signal acts directly on the first ignition device.

[0047] In one possible embodiment, the external trigger module 20 detonates the first ignition device by receiving an external trigger signal. It can be directly connected to an external device via a connection wire from the connection structure unit 230, or an overvoltage protection unit 240 can be added between the connection structure unit 230 and the first ignition device to prevent malfunction of the first ignition device due to abnormal voltage fluctuations in the external trigger signal. The overvoltage protection unit 240 includes a first transient voltage suppression diode TVS1 (TVS), which is connected in parallel between two pins of the connection structure unit 230 or between two pins of the first ignition device, to protect the first ignition device from the risk of malfunction due to external voltage surge fluctuations.

[0048] In one possible embodiment, the external trigger module 20 includes a rectification protection unit 220 and a high-low voltage isolation unit 210; the high-low voltage isolation unit 210 is used to collect the internal trigger signals at both ends of the signal melt and isolate and transmit them to the rectification protection unit 220; the rectification protection unit 220 is used to transmit the internal trigger signals unidirectionally to the first ignition device; the rectification protection unit 220 is also used to prevent the external trigger signals from being transmitted to the high-low voltage isolation unit 210.

[0049] In specific implementation, the high and low voltage isolation unit 210 is a high voltage resistant isolation unit set up to prevent the high voltage signal of the internal trigger module 10 from conducting with the external low voltage signal.

[0050] Specifically, the high-low voltage isolation unit 210 includes a transformer T1. In this embodiment, the transformer T1 is selected as an isolation device to isolate the internal signal of the synchronous trigger fuse 200 from the external signal of the external device; the first end of the high-voltage side of the transformer T1 is connected to the first end of the signal fuse, and the second end of the high-voltage side of the transformer T1 is connected to the second end of the signal fuse; the first end of the low-voltage side of the transformer T1 is connected to the input terminal of the rectifier protection unit 220, and the second end of the low-voltage side of the transformer T1 is connected to the negative terminal of the external device, so that the transformer T1 can use the arc voltage generated when the signal fuse melts to power the circuit where the high-low voltage isolation unit 210 is located, thereby providing an internal trigger signal for the second ignition device.

[0051] In order to reduce the dependence on the isolation voltage and other performance of the transformer T1, or to reduce the size of the transformer T1 and thus reduce costs, a device that can filter and reduce the arc voltage, such as a capacitor or a TVS diode, can be connected between the high and low voltage isolation unit 210 and the signal fuse. This is not a unique limitation.

[0052] Optionally, the high and low voltage isolation unit 210 further includes a second overcurrent protection unit 250; the second overcurrent protection unit 250 is connected between the high voltage side of the transformer T1 and the signal fuse, and is used to disconnect the circuit connection between the transformer T1 and the signal fuse when the internal trigger signal is greater than a first preset value, so as to prevent the internal trigger signal greater than the first preset value from being transmitted to external devices.

[0053] In a specific implementation, the second overcurrent protection unit 250 includes a second transient voltage suppression diode (TVS2), a first capacitor (C1), a fifth resistor (R5), a sixth resistor (R6), and a second fuse (F2). The first end of the second transient voltage suppression diode (TVS2) is connected to the first end of the signal fuse, the first end of the first capacitor (C1), and the first end of the second fuse (F2). The second end of the second transient voltage suppression diode (TVS2) is connected between the second end of the signal fuse and the first end of the first pre-cut-off section, and is also connected to the second end of the first capacitor (C1), the first end of the fifth resistor (R5), and the first end of the sixth resistor (R6). The second end of the second fuse (F2) is connected to the first end of the high-voltage side of the high-low voltage isolation unit 210, and the second ends of the fifth resistor (R5) and the sixth resistor (R6) are both connected to the second end of the high-voltage side of the high-low voltage isolation unit 210.

[0054] In this embodiment, the arc voltage generated when the signal fuse melts is clamped by the second transient voltage suppression diode TVS2 to suppress excessively high arc voltage. The high-voltage side of the high-low voltage isolation unit 210 is protected by the second fuse F2. When the current on the high-voltage side exceeds a preset threshold, the circuit between the external trigger unit of the second pre-cut-off section and the inside of the fuse is cut off.

[0055] Furthermore, the rectifier protection unit 220 includes a first diode D1; the input terminal of the first diode D1 is connected to the first terminal of the low-voltage side of the transformer T1, and the output terminal of the first diode D1 is connected to the positive terminal of the first ignition device.

[0056] Specifically, the rectifier protection unit 220 may further include a rectifier bridge 2211, a seventh resistor R7, and an eighth resistor R8. The first input terminal of the rectifier bridge 2211 is connected to the first input terminal of the low-voltage side of the high-low voltage isolation unit 210. The second input terminal of the rectifier bridge 2211 is connected to the second terminal of the low-voltage side of the high-low voltage isolation unit 210. The first output terminal of the rectifier bridge 2211 is connected to the input terminal of the first diode D1. The output terminal of the first diode D1 is connected to the first terminal of the seventh resistor R7, the first terminal of the eighth resistor R8, the positive terminal of the first ignition device, and the positive terminal of the external device. The second output terminal of the rectifier bridge 2211, the second terminal of the seventh resistor R7, the second terminal of the eighth resistor R8, and the negative terminal of the first ignition device are all connected to the negative terminal of the external device.

[0057] In its specific implementation, the rectifier protection unit 220 is designed for unidirectional conduction from the high-voltage side to the low-voltage side. This means the arc voltage of the internal trigger module 10 can only provide an internal trigger signal to the first ignition device in one direction, while the external trigger signal cannot be reversed through the rectifier protection unit 220 and the high-low voltage isolation unit 210 to provide an external trigger signal to the signal fuse. The high-low voltage isolation unit 210 converts the high-voltage signal from the high-voltage side into a low-voltage signal and then isolates and transmits it to the rectifier bridge 2211. After rectification by the rectifier bridge 2211, the signal is transmitted to the first ignition device through the first diode D1. During this process, the current is shunted by the seventh resistor R7 and the eighth resistor R8.

[0058] This application also provides a synchronously triggered fuse 200, including a fuse housing, wherein the aforementioned synchronously triggered fuse control circuit 100 is disposed within the fuse housing; wherein, The fuse housing includes a first receiving chamber 21, a second receiving chamber 22, at least one first movable chamber 23, and at least one second movable chamber 24. The first receiving chamber 21 houses an external trigger module board 211, and the second receiving chamber 22 houses an internal trigger circuit board 221. The internal trigger circuit board 221 contains an internal trigger module 10, and the external trigger module board 211 contains an external trigger module 20. The first movable chamber 23 contains at least one first ignition device 231 and at least one first impact member 232, with at least one first pre-cutting portion 31 distributed along the impact path of the at least one first impact member 232. The second movable chamber 24 contains at least one second ignition device 241 and at least one second impact member 242, with at least one second pre-cutting portion 32 distributed along the impact path of the at least one second impact member 242.

[0059] Specifically, the fuse housing is also provided with a first receiving chamber 21 and a second receiving chamber 22; the external trigger module board 211 is housed in the first receiving chamber 21 to fix the external trigger module board 211; and the internal trigger circuit board 221 is housed in the second receiving chamber 22 to fix the internal trigger circuit board 221.

[0060] An external trigger module 20 is mounted on the external trigger module board 211. The external trigger module 20 is connected to the first ignition device 231 and the control unit outside the fuse via a first wire. An internal trigger module 10 is mounted on the internal trigger circuit board 221. The internal trigger module 10 is electrically connected to the second ignition device 241 and the conductor via a second wire. It is understood that the first wire and the second wire can be a single wire or composed of multiple separate wire segments; no unique limitation is made here.

[0061] In specific implementation, the fuse housing is divided into an upper housing and a lower housing, with the conductor as the boundary. The upper housing contains one or more first movable chambers 23 and one or more second movable chambers 24. A first ignition device 231 and a first impact member 232 are arranged as a group in the corresponding first movable chamber 23, and a second ignition device 241 and a second impact member 242 are arranged as a group in the corresponding second movable chamber 24. The fuse housing has a first opening 201 and a second opening 202. The conductor enters the fuse housing through the first opening 201 and exits through the second opening 202, or it can enter the fuse housing through the second opening 202 and exit through the second opening 202. One end of the first conductive bar 33 of the conductor exits through the first opening 201 to form a first terminal 35, and one end of the second conductive bar 34 of the conductor exits through the second opening 202 to form a second terminal 36. The conductor is positioned in the first impact direction of the first impact member 232 and the second impact member 242 in the second impact direction. In the second impact direction; when an abnormal current is generated in the main circuit, the signal melt RR is melted by the abnormal current, and a high voltage is generated at both ends of the signal melt RR. The second current limiting unit 12 collects the high voltage and transmits it to the ignition device. Since the high voltage is greater than the internal trigger current of the second ignition device 241, the second ignition device 241 is triggered, and the gunpowder in the second ignition device 241 is detonated, generating high temperature and high pressure gas, which pushes the second impact member 242 to move rapidly along the second active chamber 24, so that the second pre-cutting part 32 set in the second impact direction is broken.

[0062] As can be seen, in this embodiment, by setting the first accommodating chamber 21 and the second accommodating chamber 22 to fix the external trigger module 20 and the internal trigger circuit board 221, the current reliability is improved; at the same time, by accommodating the corresponding first ignition device 231, first impact member 232, second ignition device 241 and second impact member 242 in the first movable chamber 23 and the second movable chamber 24, the layout of the fuse structure is realized, which further improves the reliability of the fuse.

[0063] In one possible embodiment, please refer to Figure 5 , Figure 6 , Figure 7 and Figure 8 The fuse housing is further provided with an arc-extinguishing chamber 27, and an arc-extinguishing melt 271 is provided in the arc-extinguishing chamber 27. The arc-extinguishing chamber 27 is filled with an arc-extinguishing medium that surrounds the arc-extinguishing melt 271. The two ends of the arc-extinguishing melt 271 are respectively connected to the first end of the second pre-cutting part 32 and the first end of the first pre-cutting part 31.

[0064] Specifically, the fuse housing is provided with one or more third receiving chambers 25; a third impact member 251 is housed in the third receiving chamber 25, and a first fixing part 2511 is provided on the third impact member 251, and the arc-extinguishing fusible element 271 is fixed on the first fixing part 2511; the third receiving chamber 25 is provided with a third opening 252, and the third opening 252 is located in the third impact direction of the third impact member 251; when the first impact member 232 or the second impact member 242 impacts along the third impact direction, it enters the third receiving chamber 25 through the corresponding third opening 252 to impact the third impact member 251, so as to break the arc-extinguishing fusible element 271 fixed on the first fixing part 2511.

[0065] In a specific implementation, one or more third receiving chambers 25 are provided in the lower part of the fuse housing. These third receiving chambers 25 are located below the first pre-cutting portion 31 and the second pre-cutting portion 32 of the conductor, while the first movable chamber 23 and the second movable chamber 24 are located above the first pre-cutting portion 31 and the second pre-cutting portion 32 of the conductor. That is, the conductor is positioned between the first movable chamber 23 and the corresponding third receiving chamber 25, and also between the second movable chamber 24 and the corresponding third receiving chamber 25. A third impact member 251 is housed in the third receiving chamber 25. A first fixing portion 2511 is provided on the third impact member 251. The arc-extinguishing fusible element 271 is positioned by being fitted onto the first fixing portion 2511, so that the arc-extinguishing fusible element 271 is not easily dislodged from the impact path of the third impact member 251. After the first impactor 232 moves along the first movable chamber 23 and breaks the first pre-cut section 31, it continues to impact the corresponding third accommodating chamber 25, causing the third impactor 251 to break the arc-extinguishing melt 271 after being impacted. This forms multiple sets of fractures on the arc-extinguishing melt 271 (the number of fractures corresponds to the number of weak breaks 2711 on the arc-extinguishing melt 271), thereby achieving the disconnection of the protected circuit. Similarly, when the second impactor 242 moves along the second movable chamber 24... After the second pre-cutting part 32 is broken by the movement, it then enters the corresponding third accommodating chamber 25 to impact the third impact member 251. After being impacted, the third impact member 251 breaks the arc-extinguishing fuse 271, thereby forming multiple sets of fractures on the arc-extinguishing fuse 271 (the number of fractures corresponds to the number of weak disconnected parts 2711 on the arc-extinguishing fuse 271), so as to cut off the protected circuit, accelerate the arc extinguishing time, and improve the breaking capacity and insulation resistance of the synchronous trigger fuse 200 of the present invention.

[0066] In one possible embodiment, the third impact member 251 is further provided with a first limiting part 2512 and a second limiting part 2513, and a first limiting groove 2514 is formed between the first limiting part 2512 and the second limiting part 2513. When the arc-extinguishing fuse 271 is fixed on the first fixing part 2511, it is accommodated in the first limiting groove 2514, and the arc-extinguishing fuse 271 is restricted in the first limiting groove 2514 by the first limiting part 2512 and the second limiting part 2513, so as to prevent the arc-extinguishing fuse 271 from being displaced from the groove wall, bottom or other directions, thereby realizing the fixation of the arc-extinguishing fuse 271 and improving the reliability of the high-current synchronous triggering fuse 200.

[0067] In one optional embodiment, when the third impactor 251 is impacted by the first impactor 232 and moves along the side wall of the third accommodating chamber 25 toward the bottom of the third accommodating chamber 25 together with the arc-extinguishing melt 271, if the arc-extinguishing melt 271 is only positioned by the obstruction of the arc-extinguishing medium filled inside the arc-extinguishing chamber 27, the position and number of fractures of the arc-extinguishing melt 271 by the third impactor 251 are relatively random. The prior art clamps the arc-extinguishing melt 271 at the contact position between the arc-extinguishing melt 271 and the third impactor 251 in the third accommodating chamber 25 by the interference fit between the cavity wall and the third impactor 251, and then, when the third impactor 251 impacts toward the bottom of the third accommodating chamber 25, the arc-extinguishing melt 271 is broken by the combined action of the impact force and the interference fit clamping force. In this configuration, as the third impactor 251 continues to move at the bottom of the third accommodating chamber 25, the fracture on the arc-extinguishing melt 271 will generate a continuous arc between the third impactor 251 and the surrounding walls of the third accommodating chamber 25. This results in severe carbonization of the plastic part surface, and the insulation resistance of the product after the breaking test, especially in the low-current test, will be very low, making it difficult to meet the customer's requirements for product breaking performance. In this embodiment, to solve this problem, a second fixing part is provided on the wall of the arc-extinguishing chamber 27, and the weak breaking part 2711 (such as a through hole, a narrow neck, etc.) of the arc-extinguishing melt 271 is fitted onto the second fixing part. When the arc-extinguishing chamber 27 is filled with the arc-extinguishing medium, both the second fixing part and the weak breaking part 2711 can be wrapped around it.

[0068] In the width direction, the cross-sectional area of ​​the neck of the broken weak part 2711 is much smaller than the cross-sectional area of ​​other positions adjacent to the arc-extinguishing melt 271. Therefore, when the third impact member 251 moves downward in the third accommodating chamber 25 and the arc-extinguishing melt 271 is subjected to tensile force, the fracture position is preferably formed at the neck position of the broken weak part 2711. When the distance between the broken weak part 2711 and the cavity wall of the third accommodating chamber 25 is designed to be greater than the downward movement distance of the third impact member 251, the fracture of the broken weak part 2711 will always remain within the arc-extinguishing material. This accelerates the extinction of the arc and prevents the arc from eroding the third impact member 251 and the cavity wall of the third accommodating chamber 25, thereby improving the insulation resistance after the product is broken.

[0069] In addition, in the structural design of the synchronous trigger fuse 200 of this application, a cutting structure that can cut off the arc-extinguishing fuse 271 is also added below the structure of the second ignition device 241 corresponding to the internal trigger. This allows multiple breaks to be formed on the arc-extinguishing fuse 271, which not only disperses the arc energy but also helps to accelerate the extinguishing process of the arc on the arc-extinguishing fuse 271, thereby improving the breaking current capability and insulation resistance performance of the product across the entire current protection range.

[0070] In one possible embodiment, please refer to Figure 8 The second impact member 242 is provided with a first groove 2515, and a first sealing member 2516 is provided in the first groove 2515. The first groove 2515 and the cavity wall of the third accommodating chamber 25 clamp the first sealing member 2516 by interference fit.

[0071] In a specific implementation, a groove (i.e., a first groove 2515) is provided on each side of the upper part of the third impact member 251. Then, a first sealing member 2516 is installed in the first groove 2515. When the third impact member 251 is installed into the through hole, it is ensured that the first sealing member 2516 can be stuck on the side walls on both sides of the through hole. Thus, when the arc-burning gas flows upward from the lower arc-extinguishing chamber 27 along the third accommodating chamber 25, the first sealing member 2516 can prevent the gas from overflowing. Moreover, the first sealing member 2516 can always be in a compressed and sealed state as the third impact member 251 moves downward, thereby reducing the impact of the shell molding dimensional tolerance on the product performance.

[0072] It is understandable that the first groove 2515 can also be an annular groove, and the first seal 2516 can be set as a sealing ring.

[0073] Furthermore, a sealing strip can also be added between the bottom of the third impact member 251 and the inner wall of the third accommodating chamber 25 to prevent the arc-extinguishing gas and high-temperature arc generated in the arc-extinguishing chamber 27 from overflowing to the outside of the housing and affecting the safety of other devices around the product.

[0074] In one possible embodiment, please refer to Figure 9 , Figure 10 and Figure 11 The fuse housing is further provided with a fourth receiving chamber 26, which is used to receive the protection unit 13.

[0075] In a specific implementation, the shape of the fourth accommodating chamber 26 is adapted to the protection unit 13, and the protection unit 13 is housed in the fourth accommodating chamber 26; the positional relationship between the fourth accommodating chamber 26 and the protection unit 13 is described below through a specific example.

[0076] Specifically, the fourth accommodating chamber 26 is provided with a first channel 261 communicating with the first end of the second pre-cutting part 32 and a second channel 262 communicating with the first accommodating chamber 21. The protection unit 13 is connected to the internal triggering module 10 through the second channel 261 and to the first end of the second pre-cutting part 32 through the first channel 261.

[0077] Example 1 Please see Figure 9 A cavity can be reserved on the side of the upper housing of the fuse housing near the second pre-cut section 32 on the first conductive busbar 33 as a fourth accommodating chamber 26. The fourth accommodating chamber 26 is arranged perpendicular to the conductor, so that the first channel 261 is directly connected to the conductor and the second channel 262 is directly connected to the first accommodating chamber 21.

[0078] Furthermore, the conductor is provided with a connection hole 37, and the protection unit 13 is provided with a first connection end 131 (i.e., the first end) and a second connection end 132 (i.e., the second end). The second connection end 132 of the protection unit 13 can be inserted into the fourth accommodating chamber 26 through the second channel 262. The protection unit 13 slides into the fourth accommodating chamber 26, and finally the second connection end 132 is inserted into the connection hole 37, so that the protection unit 13 is connected to the first end of the second pre-cutting part 32 through the second connection end 132. After the protection unit 13 is accommodated in the fourth accommodating chamber 26, the internal trigger circuit board 221 is placed in the first accommodating chamber 21, and the first connection end 131 is soldered and fixed to the pads on the internal trigger circuit board 221, so that the protection unit 13 is connected to the internal trigger module 10 (specifically the first current limiting unit 11) through the first connection end 131.

[0079] Optionally, the protection unit 13 may include a first fuse F1, which may be a tubular lead wire type fuse; the first connection end 131 and the second connection end 132 may be a crown spring on the first fuse F1.

[0080] Example 2 Please see Figure 10 and Figure 11 Compared to Example 1, in Example 2, the fourth receiving chamber 26 can be arranged parallel to the plane of the internal trigger circuit board 221. The first channel 261 of the fourth receiving chamber 26 extends vertically from the top of the fuse housing to the connection hole 37. The fourth receiving chamber 26 can be a groove, in which the protection unit 13 is directly received. In this case, the second connection end 132 of the protection unit 13 is far from the connection hole 37, so it can pass through. Alternatively, the first end of an additional third wire 133 can be connected to the first connection end 131, and then the second end of the third wire 133 can be connected to the internal trigger circuit board 221 and connected to the internal trigger module 10. Similarly, the first end of an additional fourth wire 134 can be connected to the second connection end 132, and then the fourth wire 134 can be connected to the connection hole 37 along the first channel 261, and the second end of the third wire 133 can be soldered into the connection hole 37.

[0081] As can be seen, in this embodiment, after the second pre-cutting part 32 is cut off, the protection unit 13 melts and disconnects the conductor from the internal trigger module 10, so as to prevent the external system high voltage on the conductor from being continuously applied to the internal trigger module 10, causing the internal trigger control circuit board to experience high voltage arcing.

[0082] While this application discloses the above information, it is not limited thereto. Any person skilled in the art can easily conceive of variations or substitutions without departing from the spirit and scope of this application, and can make various alterations and modifications, including combinations of the different functions and implementation steps described above, as well as software and hardware implementation methods, all of which are within the protection scope of this application.

Claims

1. A synchronously triggered fuse control circuit, characterized in that, It includes at least one first ignition device, at least one second ignition device, at least one first impact member and at least one second impact member, at least one conductor, an arc-extinguishing fusible element, an internal triggering module and an external triggering module; the conductor is provided with a signal fusible element, at least one first pre-cut-off section and at least one second pre-cut-off section connected in sequence, and the two ends of the arc-extinguishing fusible element are respectively connected to the conductor; the external triggering module and the internal triggering module are both connected to the conductor of the synchronous triggering fuse; The external trigger module is used to receive an external trigger signal, and when the external trigger signal is received, it triggers the first ignition device to cut off the conductor to cut off the protected circuit. The internal triggering module includes a first current limiting unit. A first end of the first current limiting unit is connected to the negative terminal of the second ignition device. A second end of the first current limiting unit is connected to the first end of the second pre-cutoff section. The positive terminal of the second ignition device is connected to the first end of the signal fusible link. The first end of the first pre-cutoff section is connected to the second end of the signal fusible link, and the second end of the first pre-cutoff section is connected to the second end of the second pre-cutoff section. The first current limiting unit is used to limit the second current flowing through the second ignition device to less than the internal triggering current of the second ignition device under normal conditions, and to limit the second current to greater than or equal to the internal triggering current when the first pre-cutoff section is cut off. The external triggering module is further configured to trigger the first ignition device to cut off the conductor and thus disconnect the protected circuit when an internal triggering signal is acquired on the conductor; the internal triggering module includes a second current limiting unit; the first end of the second current limiting unit is configured to be connected to the negative terminal of the second ignition device; the second end of the second current limiting unit is configured to be connected between the second end of the signal fuse and the first end of the first pre-cut-off part; wherein, the second current limiting unit is configured to limit the first current flowing through the second ignition device to less than the internal triggering current under normal conditions, and to limit the first current to greater than or equal to the internal triggering current when an abnormal current is generated, so as to trigger the second ignition device to cut off the conductor and thus disconnect the protected circuit.

2. The synchronous trigger fuse control circuit according to claim 1, characterized in that, It includes a first overcurrent protection unit, which is connected between the first end of the second pre-cut-off section and the first current limiting unit, and is used to cut off the circuit between the second pre-cut-off section and the second ignition device when the current is greater than a preset threshold.

3. The synchronous trigger fuse control circuit according to claim 1 or 2, characterized in that, The synchronous trigger fuse includes at least one first ignition device, at least one second ignition device, at least one first impact member and at least one second impact member, at least one conductor and an arc-extinguishing fuse. The conductor is provided with a signal fuse, at least one first pre-cut-off part and at least one second pre-cut-off part connected in sequence. The two ends of the arc-extinguishing fuse are respectively connected to the conductor. The external triggering module includes a rectifier protection unit and a high-low voltage isolation unit; The high and low voltage isolation unit is used to collect the internal trigger signals at both ends of the signal melt and transmit them to the rectification protection unit in isolation; the rectification protection unit is used to transmit the internal trigger signals unidirectionally to the first ignition device. The rectifier protection unit is also used to prevent external trigger signals from being transmitted to the high and low voltage isolation unit.

4. The synchronous trigger fuse control circuit according to claim 3, characterized in that, The high- and low-voltage isolation unit includes a transformer; The first end of the high-voltage side of the transformer is connected to the first end of the signal fuse, and the second end of the high-voltage side of the transformer is connected to the second end of the signal fuse. The first end of the low-voltage side of the transformer is connected to the input end of the rectifier protection unit, and the second end of the low-voltage side of the transformer is connected to the negative terminal of an external device.

5. The synchronous trigger fuse control circuit according to claim 4, characterized in that, The high and low voltage isolation unit also includes a second overcurrent protection unit; The second overcurrent protection unit is connected between the high-voltage side of the transformer and the signal fuse. It is used to disconnect the circuit connection between the transformer and the signal fuse when the internal trigger signal is greater than a first preset value, so as to prevent the internal trigger signal greater than the first preset value from being transmitted to external devices.

6. The synchronous trigger fuse control circuit according to claim 4, characterized in that, The rectifier protection unit includes a first diode; The input terminal of the first diode is connected to the first terminal of the low-voltage side of the transformer, and the output terminal of the first diode is connected to the positive terminal of the first ignition device.

7. A synchronously triggered fuse, characterized in that, The fuse includes a fuse housing, wherein the fuse housing is provided with a synchronously triggered fuse control circuit as described in any one of claims 1-6; wherein, The fuse housing is provided with a first receiving chamber, a second receiving chamber, at least one first movable chamber, and at least one second movable chamber; The first accommodating chamber houses an external trigger circuit board, and the second accommodating chamber houses an internal trigger circuit board; the internal trigger circuit board is equipped with an internal trigger module, and the external trigger circuit board is equipped with an external trigger module. The first active chamber is provided with at least one first ignition device and at least one first impact member, and the at least one first pre-cutting part is disposed on the impact path of the at least one first impact member; The second active chamber is provided with at least one second ignition device and at least one second impact member, and the at least one second pre-cutting part is disposed on the impact path of the at least one second impact member.

8. The synchronously triggered fuse according to claim 7, characterized in that, The fuse housing is further provided with an arc-extinguishing chamber and one or more third receiving chambers. The arc-extinguishing chamber is provided with an arc-extinguishing fusible element and is filled with an arc-extinguishing medium that surrounds the arc-extinguishing fusible element. The two ends of the arc-extinguishing fusible element are respectively connected to the first end of the second pre-cut-off section and the first end of the first pre-cut-off section. The third accommodating chamber contains a third impactor, and the third impactor is provided with a first fixing part, and the arc-extinguishing melt is fixed on the first fixing part; The third accommodating chamber is provided with a third opening, which is located in the third impact direction of the third impact member; when the first impact member or the second impact member impacts along the third impact direction, it enters the third accommodating chamber through the corresponding third opening to impact the third impact member, thereby breaking the arc-extinguishing melt fixed on the first fixing part.

9. The synchronously triggered fuse according to claim 7, characterized in that, The fuse housing is further provided with a fourth receiving chamber, which is used to house the protection unit; The fourth accommodating chamber is provided with a first channel communicating with the first end of the second pre-cutting part and a second channel communicating with the first accommodating chamber. The protection unit is connected to the internal triggering module through the second channel and to the first end of the second pre-cutting part through the first channel.

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