Smart fuse

Abstract

The present invention provides an intelligent fuse, comprising: a conductor, on which a fuse is connected in series; an internal trigger component, used to generate a first trigger signal; an external trigger signal electrical connector, used to couple a second trigger signal to the inside of the intelligent fuse; a sensor, used to detect the on-off state of the conductor; a processor, used to determine the on-off state of the conductor according to the detection result of the sensor after receiving the first trigger signal or the second trigger signal, and generate a third trigger signal if the conductor is conductive; an explosion device, used to generate explosive gas according to the received trigger signal, the explosion device at least comprising a first explosion device and a second explosion device, wherein the first explosion device generates explosive gas according to at least two of the first trigger signal, the second trigger signal and the third trigger signal, and the second explosion device can generate explosive gas according to at least the third trigger signal; and a cutting device, used to cut off the conductor.

Description

Technical Field

[0001] The invention belongs to the field of fuses, and in particular relates to an intelligent fuse. Background Art

[0002] The statements in this section are merely intended to provide background information related to the present invention to help understanding the present invention. Such background information does not necessarily constitute prior art.

[0003] In circuit protection systems, thermal fuses are usually used to passively cut off the circuit under extreme conditions of system overload and short circuit to achieve the purpose of protecting the system. However, with the booming development of new energy and other industries, especially the semiconductor device and battery device industries, new and higher requirements have been put forward for current protection devices: fast protection speed, large rated current, low protection current limit, high safety requirements, diversified needs, etc., and traditional fuses cannot meet these requirements at the same time. Summary of the invention

[0004] In order to meet the above requirements, the present invention provides an intelligent fuse, comprising:

[0005] A conductor, used for electrically connecting to the protected circuit system, and having a fuse connected in series thereto;

[0006] An internal trigger component, used for generating a first trigger signal according to the voltage across the fuse;

[0007] An external trigger signal electrical connector, used to couple a second trigger signal generated by an external system to the inside of the smart fuse;

[0008] A sensor for detecting the on / off state of the conductor;

[0009] a processor, configured to determine the on / off state of the conductor according to the detection result of the sensor after receiving the first trigger signal or the second trigger signal, and generate a third trigger signal if the conductor is on;

[0010] An explosion device, used to generate explosion gas according to a received trigger signal, the explosion device comprising at least a first explosion device and a second explosion device, wherein the first explosion device generates explosion gas according to at least two of the first trigger signal, the second trigger signal and the third trigger signal, and the second explosion device can generate explosion gas according to at least the third trigger signal; and a cutting device, used to cut off the conductor under the impetus of the explosion gas.

[0011] According to the smart fuse of the present invention, preferably, the sensor is a Hall sensor.

[0012] According to the smart fuse of the present invention, preferably, it also includes a delay circuit, which is used to delay the first trigger signal or the second trigger signal by a preset time before transmitting it to the processor.

[0013] According to the intelligent fuse of the present invention, preferably, the processor is configured to wait for a preset time after receiving the first trigger signal or the second trigger signal, then read the detection result and determine the on / off state of the conductor.

[0014] According to the intelligent fuse of the present invention, preferably, the first explosion device is configured to generate explosion gas according to the first trigger signal and the second trigger signal; the second explosion device is configured to generate explosion gas according to the third trigger signal.

[0015] According to the intelligent fuse of the present invention, preferably, the first explosion device is configured to generate explosion gas according to the first trigger signal and to generate explosion gas according to the third trigger signal, and the second explosion device is configured to generate explosion gas according to the second trigger signal and to generate explosion gas according to the third trigger signal.

[0016] The intelligent fuse according to the present invention preferably further comprises a third explosion device, which is configured to generate explosion gas according to the third trigger signal.

[0017] The intelligent fuse according to the present invention preferably further comprises a third explosion device, which is configured to generate explosion gas according to the first trigger signal and the second trigger signal.

[0018] The intelligent fuse according to the present invention preferably further comprises a third explosion device which is configured to generate explosion gas according to both the second trigger signal and the third trigger signal.

[0019] The intelligent fuse according to the present invention preferably further comprises a third explosion device which is configured to generate explosion gas according to both the first trigger signal and the third trigger signal.

[0020] Compared with the prior art, the advantages of the present invention are: after the internal trigger component generates the first trigger signal or the external system generates the second trigger signal, the on-off state of the circuit is detected. If the first trigger signal or the second trigger signal fails to detonate due to failure of the explosive device or other reasons, and the circuit is not disconnected, a third trigger signal is generated to detonate the backup explosive device to ensure that the circuit is disconnected and the safety of the protected system is ensured; and the backup method of the explosive device is flexible to meet the diverse needs of different users. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The embodiments of the present invention are further described below with reference to the accompanying drawings, in which:

[0022] Figure 1 is a cross-sectional view of a smart fuse structure according to an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of an intelligent fuse according to Embodiment 1 of the present invention;

[0024] Figure 3 This is a schematic diagram of the structure of an intelligent fuse according to Embodiment 2 of the present invention;

[0025] Figure 4 This is a schematic diagram of the structure of an intelligent fuse according to Embodiment 3 of the present invention;

[0026] Figure 5 This is a schematic diagram of the structure of an intelligent fuse according to Embodiment 4 of the present invention;

[0027] Figure 6 This is a schematic diagram of the structure of an intelligent fuse according to Embodiment 5 of the present invention;

[0028] Figure 7 This is a schematic diagram of the structure of an intelligent fuse according to Embodiment 6 of the present invention;

[0029] Figure 8 This is a schematic diagram of the structure of an intelligent fuse according to Embodiment 7 of the present invention; DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings. It should be noted that the embodiments given in the present invention are only for illustration and do not limit the scope of protection of the present invention.

[0031] In order to meet the above requirements, the present invention provides an intelligent fuse that can quickly respond to fault currents of various sizes, has high safety, and meets diverse needs.

[0032] Figure 1 FIG. 1 is a cross-sectional view of a smart fuse structure according to an embodiment of the present invention. Figure 1As can be seen in the figure, the intelligent fuse includes a housing 11, and two accommodating chambers are formed inside the housing 11, namely, a first chamber 12 and a second chamber 15. The conductor 8 connected to the circuit of the protected system passes through the housing 11, and divides the second chamber 15 in the housing 11 into two parts, a first sub-chamber 13 with an explosion chamber and a second sub-chamber 14 with an arc extinguishing chamber. Both ends of the conductor 8 extend to the outside of the housing 11, which is convenient for connection with the circuit. The part of the conductor 8 inside the housing 11 is connected in series with a fuse 9, and the fuse 9 is melted when the current flowing through the conductor 8 exceeds a preset value. A transformer 6 is arranged in the first chamber 12, and the primary end of the transformer 6 is electrically connected to the conductor 8 on both sides of the fuse 9 through a wire 7 made of, for example, copper. The transformer 6 is used to convert the voltage generated when the fuse 9 is melted into an internal trigger signal. In another embodiment, the wire 7 can be electrically connected to the conductor 8 by welding, or other methods known in the art can be used. In the first sub-chamber 13, a cutting device 5 is provided, which is used to cut the conductor 8 at the preset break on the conductor 8 and push away the arc generated at the break. The cutting device 5 can be implemented with an arc extinguishing grid, so that it also has the function of extinguishing the arc. A plurality of ignition tubes 3 are arranged on the surface of the cutting device 5 away from the conductor 8, and are distributed on a circumference with the center of the surface as the center. When the ignition tube 3 is triggered, the explosive tube installed therein explodes, and the gas generated during the explosion pushes the cutting device 5 to move quickly toward the preset break to cut the conductor 8. After the cutting device 5 stops moving, the surface on which the ignition tube 3 is installed and the inner wall of the first sub-chamber 13 expose at least a part of the explosion chamber. Inside the inner wall of the first sub-chamber 13, an embedded steel plate 4 is provided to form a protective layer of the explosion chamber. On the side of the transformer 6 and the embedded steel plate 4 away from the conductor 8, a circuit board 2 is provided, which is electrically connected with the secondary end of the transformer 6 and the ignition tube 3, and is used to control at least one of the ignition tubes 3 according to the signal of the secondary end of the transformer 6. In the second sub-chamber 14 , an arc extinguishing chamber 10 is arranged opposite to the disconnecting device 5 , for extinguishing the arc pushed in by the disconnecting device 5 . Figure 1 The arc extinguishing chamber 10 is only schematically shown in the figure, and the arc extinguishing chamber 10 may adopt an arc extinguishing chamber structure known in the art.

[0033] The circuit board 2 is provided with a plurality of conductive through holes. When it is placed above the transformer 6 and the ignition tube 3, the secondary pins of the transformer 6 and the pins of the ignition tube 3 can pass through these through holes for further welding. A voltage stabilizing device (not shown) can also be provided on the circuit board 2 to stabilize the internal trigger signal output by the transformer 6 within a preset voltage range, thereby ensuring that the ignition tube 3 connected to the internal trigger signal can respond to the voltage signal and work without damaging it. Furthermore, a rectifier device (not shown), such as a rectifier bridge, is provided between the transformer 6 and the voltage stabilizing device. An external trigger signal connector 1, such as Figure 1As shown, the external trigger signal connector 1 is electrically connected to the circuit board 2 through the housing 11 , and couples the external trigger signal to at least one of the ignition tubes 3 .

[0034] For the sake of convenience, in the present invention, the various components that generate the internal trigger signal (such as the transformer 6, the rectifier bridge, etc.) are collectively referred to as the internal trigger component 111, the internal trigger signal is referred to as the first trigger signal S1, and the external trigger signal is referred to as the second trigger signal S2.

[0035] The circuit board 2 is also provided with devices such as a processor 112 and a sensor 113. The sensor 113 can monitor the voltage or current on the conductor 8. For example, a Hall sensor can be used to monitor the voltage at both ends of the conductor pre-break. The first trigger signal S1 and the second trigger signal S2 are transmitted to at least one of the ignition tubes 3 and are also transmitted to the processor 112. After receiving the first trigger signal S1 or the second trigger signal S2, the processor 112 determines the on-off state (on or off) of the conductor 8 through the monitoring result of the sensor 113. When it is determined that the conductor is on, a third trigger signal S3 is generated and transmitted to other ignition tubes 3.

[0036] As required, other devices may be arranged on the circuit board 2. According to the embodiment of the present invention, the ignition tube may also be implemented by other explosive devices, such as a micro gas generator.

[0037] The following is combined with Figure 2-8 The technical solution of the present invention is further described through embodiments 1 to 7.

[0038] See Figure 2 In the first embodiment shown, the ignition tube 3-1 is electrically connected to the internal trigger component 111 and the external trigger signal connector 1 at the same time, and can generate explosive gas according to the first trigger signal S1 generated by the internal trigger component 111, and can also generate explosive gas according to the second trigger signal S2 generated by the external system (not shown) connected to the external trigger signal connector 1. The ignition tube 3-2 is electrically connected to the processor 112, and can generate explosive gas according to the third trigger signal S3 generated by the processor 112. The internal trigger component 111 and the external trigger signal connector 1 are electrically connected to the processor 112 respectively, so as to transmit the first trigger signal S1 or the second trigger signal S2 to the ignition tube 3-1 and the processor 112 at the same time.

[0039] The processor 112 can be a CPU, an MCU, and the power supply 114 for the processor 112 can be a dry cell or a rechargeable battery. The above examples are for illustration only, and the specific implementation scheme is not limited thereto. The first trigger signal S1 or the second trigger signal S2 can be respectively extended by a preset time length through the delay circuit 115 before being transmitted to the processor 112. The preset time length is preferably 400-500 microseconds. This time length can ensure that the on-off state of the circuit is detected after the ignition tube 3-1 is detonated and the cutting device is pushed to disconnect the circuit, and the delay will not be too long to cause the intelligent fuse to respond too slowly. After the processor 112 receives the delayed first trigger signal S1 or the second trigger signal S2, the on-off state of the circuit where the conductor is located is detected by the sensor 113. If the circuit is still conducting at this time, the processor 112 will generate a third trigger signal S3, detonate the ignition tube 3-2 to cut off the conductor 8 and thus disconnect the circuit. The delay circuit 115 can be an RC delay circuit constructed by a resistor and a capacitor. Of course, the first trigger signal S1 or the second trigger signal S2 can also be transmitted directly to the processor 112 without passing through the delay circuit 115. After receiving the signal, the processor 112 waits for the preset time length and then determines the on / off state of the circuit where the conductor 8 is located according to the detection result of the sensor 113.

[0040] Thus, when the first trigger signal S1 or the second trigger signal S2 fails to detonate the ignition tube 3-1, the processor 112 generates a third trigger signal S3 to detonate the ignition tube 3-2 to drive the cutting device 5 to cut the conductor 8, disconnect the circuit, and ensure the safety of the protected system.

[0041] In addition, in order to prevent the first trigger signal S1 from interfering with the external system or the signal S1 is consumed by the external system, and to prevent the second trigger signal S2 from interfering with the internal trigger component 111 or being consumed by the internal trigger component 111, isolation devices D11 and D12 can be respectively set on the path from the first trigger signal S1 or the second trigger signal S2 to the ignition tube 3-1. In order to prevent the delay circuit 115 from interfering with the internal trigger component 111 or the external system, isolation devices D13 and D14 are respectively set on the path from the first trigger signal S1 or the second trigger signal S2 to the delay circuit 115. Further, in order to prevent the instantaneous voltage when the ignition tube 3-2 explodes from damaging the processor 112, an isolation device D15 can also be set on the path from the third trigger signal S3 to the ignition tube 3-2. The isolation device can be a diode or a Zener diode.

[0042] Embodiment 2 is another technical solution with two ignition tubes 3, specifically as follows Figure 3As shown. The ignition tube 3-1 is electrically connected to the internal trigger component 111 and the processor 112 at the same time, and it can generate explosive gas according to the first trigger signal S1 generated by the internal trigger component 111, and it can also generate explosive gas according to the third trigger signal S3 generated by the processor 112. The ignition tube 3-2 is electrically connected to the external trigger signal connector 1 and the processor 112 at the same time, and it can generate explosive gas according to the second trigger signal S2 generated by the external system, and it can also generate explosive gas according to the third trigger signal S3 generated by the processor 112. The internal trigger component 111 and the external trigger signal connector 1 are electrically connected to the processor 112 respectively, so as to transmit the first trigger signal S1 or the second trigger signal S2 to the ignition tube 3-1 and the ignition tube 3-2, and also transmit it to the processor 111.

[0043] In order to prevent the instantaneous voltage generated when the ignition tube 3-1 and the ignition tube 3-2 explode from damaging the processor 112, isolation devices D16 and D17 are respectively set on the path from the third trigger signal S3 to the ignition tube 3-1 and the ignition tube 3-2. The other parts of the second embodiment are arranged in the same way as the first embodiment and are not repeated here. When the first trigger signal S1 fails to detonate the ignition tube 3-1, the processor 112 will generate a third trigger signal S3 to detonate the ignition tube 3-2; when the second trigger signal S2 fails to detonate the ignition tube 3-2, the processor 112 will generate a third trigger signal S3 to detonate the ignition tube 3-1, that is, the ignition tube 3-1 and the ignition tube 3-2 are essentially backup ignition tubes for each other. In this way, it can be ensured that there is always an ignition tube to generate explosive gas to push the cutting device 5 to cut off the conductor 8, disconnect the circuit, and ensure the safety of the protected system.

[0044] Through the above-mentioned embodiment 1 and embodiment 2, the intelligent fuse of the present invention can detect the on-off state of the circuit. When an ignition tube fails and fails to disconnect the conductor, the spare ignition tube is triggered to disconnect the conductor, thereby ensuring the safety of the system; and only one ignition tube is detonated at a time, the generated gas pressure is small, the structural strength requirement of the fuse is low, and it is easy to implement.

[0045] In order to further enhance the reliability of the intelligent fuse, the number of ignition tubes can be increased on the basis of the first and second embodiments, so that the number of initial ignition tubes to be detonated or backup ignition tubes is two, so that the total number of ignition tubes in the fuse may be three or four, but in order to reduce the stringent requirements on the structural strength of the explosion chamber of the intelligent fuse, the number of ignition tubes detonated at the same time is usually not more than two. The control method of the total number of ignition tubes is three or four, so the present invention is only described by taking three as an example.

[0046] In the technical solution where the total number of ignition tubes is three, there are two cases: one ignition tube to be initially detonated and two backup ignition tubes, and two ignition tubes to be initially detonated and one backup ignition tube. The former is described in Example 3 and Example 4, and the latter is described in Example 5. Figure 4 As shown, the ignition tube 3-1 is electrically connected to the internal trigger component 111 and the processor 112 at the same time, and it can generate explosive gas according to the first trigger signal S1 generated by the internal trigger component 111, and it can also generate explosive gas according to the third trigger signal S3 generated by the processor 112. The ignition tube 3-2 is electrically connected to the external trigger signal connector 1 and the processor 112 at the same time, and it can generate explosive gas according to the second trigger signal S2 generated by the external system, and it can also generate explosive gas according to the third trigger signal S3 generated by the processor 112. The ignition tube 3-3 is electrically connected to the processor 112, and it can generate explosive gas according to the third trigger signal S3 generated by the processor 112. The internal trigger component 111 and the external trigger signal connector 1 are electrically connected to the processor 112 respectively, so as to transmit the first trigger signal S1 or the second trigger signal S2 to the ignition tube 3-1 and the ignition tube 3-2, and also to the processor 112.

[0047] The other parts of the third embodiment are the same as those of the second embodiment and are not described here. When the first trigger signal S1 fails to detonate the ignition tube 3-1, the processor component 112 generates a third trigger signal S3 to detonate the ignition tube 3-2 and the ignition tube 3-3 at the same time; when the second trigger signal S2 fails to detonate the ignition tube 3-2, the processor 112 generates a third trigger signal S3 to detonate the ignition tube 3-1 and the ignition tube 3-3 at the same time.

[0048] Embodiment 4 Figure 5 As shown, the ignition tube 3-1 is electrically connected to the internal trigger component 111 and the external trigger signal connector 1 at the same time, and can generate explosive gas according to the first trigger signal S1 generated by the internal trigger component 111, and can also generate explosive gas according to the second trigger signal S2 generated by the external system. The ignition tube 3-2 and the ignition tube 3-3 are electrically connected to the processor 112 at the same time, and can generate explosive gas according to the third trigger signal S3 generated by the processor 112. The internal trigger component 111 and the external trigger signal connector 1 are electrically connected to the processor 112 respectively, so as to transmit the first trigger signal S1 or the second trigger signal S2 to the ignition tube 3-1 and the processor 112 at the same time.

[0049] The other parts of the fourth embodiment are the same as those of the first embodiment, and are not described here. When the first trigger signal S1 or the second trigger signal S2 fails to detonate the ignition tube 3-1, the processor 112 generates a third trigger signal S3 to detonate the ignition tube 3-2 and the ignition tube 3-3.

[0050] Compared with embodiments one and two, the number of initial ignition tubes to be detonated in embodiments three and four is one, while there are two backup ignition tubes. This is because if the initial ignition tube to be detonated fails to detonate, the risk of failure of other ignition tubes also increases. Detonating two backup ignition tubes at the same time can further increase the probability of successful detonation and enhance the safety of the smart fuse.

[0051] The inventors also found that in some application scenarios, the response speed requirements for the fuse are very strict, and it is more meaningful to increase the probability of successful initial explosion. For this purpose, the number of ignition tubes to be initially detonated can be set to two, and the number of backup ignition tubes can be set to one, as described in Example 5.

[0052] Example 5 Figure 6 As shown, the ignition tube 3-1 and the ignition tube 3-3 are electrically connected to the internal trigger component 111 and the external trigger signal connector 1 at the same time, and can generate explosive gas according to the first trigger signal S1 generated by the internal trigger component 111, and can also generate explosive gas according to the second trigger signal S2 generated by the external system. The ignition tube 3-2 is electrically connected to the processor 112, and can generate explosive gas according to the third trigger signal S3 generated by the processor 112. The internal trigger component 111 and the external trigger signal connector 1 are electrically connected to the processor 112 respectively, so as to transmit the first trigger signal S1 or the second trigger signal S2 to the ignition tube 3-1 and the ignition tube 3-3, and also to the processor 112.

[0053] The other parts of the fifth embodiment are the same as those of the fourth embodiment and are not described here. When the first trigger signal S1 or the second trigger signal S2 fails to successfully detonate the ignition tube 3-1 and the ignition tube 3-3, the processor 112 generates a third trigger signal S3 to detonate the ignition tube 3-2.

[0054] Compared with the third and fourth embodiments, in the fifth embodiment, there are two ignition tubes to be initially detonated, and one backup ignition tube, which can meet the application scenarios with higher requirements on the response speed of the fuse. The initial detonation of two ignition tubes can increase the probability of successful detonation and ensure safety. When both ignition tubes fail to detonate, the processor 112 will detonate the backup ignition tube.

[0055] For the case where the total number of ignition tubes is three, there are two technical solutions, in which the number of ignition tubes to be initially detonated depends on whether the initial trigger signal is the first trigger signal S1 or the second trigger signal S2, and the number of ignition tubes connected to the first trigger signal S1 and the second trigger signal S2, as described in detail in Embodiment 6 and Embodiment 7.

[0056] Example 6 Figure 7As shown, the ignition tube 3-1 is electrically connected to the internal trigger component 111 and the processor 112 at the same time, and can generate explosive gas according to the first trigger signal S1 generated by the internal trigger component 111, and can also generate explosive gas according to the third trigger signal S3 generated by the processor 112. The ignition tube 3-2 and the ignition tube 3-3 are electrically connected to the external trigger signal connector 1 and the processor 112 at the same time, and can generate explosive gas according to the second trigger signal S2 generated by the external system, and can also generate explosive gas according to the third trigger signal S3 generated by the processor 112. The internal trigger component 111 and the external trigger signal connector 1 are electrically connected to the processor 112 respectively, so as to transmit the first trigger signal S1 to the ignition tube 3-1 or the second trigger signal S2 to the ignition tube 3-2 and the ignition tube 3-3, and also transmit it to the processor 112.

[0057] The other parts of the sixth embodiment are the same as those of the fifth embodiment and are not described here. When the first trigger signal fails to detonate the ignition tube 3-1, the processor 112 generates a third trigger signal S3 to detonate the ignition tube 3-2 and the ignition tube 3-3; when the second trigger signal S2 fails to detonate the ignition tube 3-2 and the ignition tube 3-3, the processor 112 generates a third trigger signal S3 to detonate the ignition tube 3-1.

[0058] Embodiment 7 Figure 8 As shown, the ignition tube 3-1 and the ignition tube 3-3 are electrically connected to the internal trigger component 111 and the processor 112 at the same time, and can generate explosive gas according to the first trigger signal S1 generated by the internal trigger component 111, and can also generate explosive gas according to the third trigger signal S3 generated by the processor 112. The ignition tube 3-2 is electrically connected to the external trigger signal connector 1 and the processor 112 at the same time, and can generate explosive gas according to the second trigger signal S2 generated by the external system, and can also generate explosive gas according to the third trigger signal S3 generated by the processor 112. The internal trigger component 111 and the external trigger signal connector 1 are electrically connected to the processor 112 respectively, so as to transmit the first trigger signal S1 to the ignition tube 3-1 and the ignition tube 3-3, or transmit the second trigger signal S2 to the ignition tube 3-2, and also transmit it to the processor 112.

[0059] The other parts of the seventh embodiment are the same as those of the sixth embodiment and are not described here. When the first trigger signal S1 fails to detonate the ignition tube 3-1 and the ignition tube 3-3, the processor 112 generates a third trigger signal S3 to detonate the ignition tube 3-2; when the second trigger signal S2 fails to detonate the ignition tube 3-2, the processor 112 generates a third trigger signal S3 to detonate the ignition tube 3-1 and the ignition tube 3-3 at the same time.

[0060] Compared with the fourth and fifth embodiments, the number of ignition tubes for initial detonation in the sixth and seventh embodiments is not fixed. When the probability that the initial trigger signal is an external trigger signal is high, the technical solution of the sixth embodiment should be considered; when the probability that the initial trigger signal is an internal trigger signal is high, the technical solution of the seventh embodiment should be considered. In this way, there are two ignition tubes to be initially detonated, and one backup ignition tube, which can increase the probability of successful detonation and ensure safety, thereby meeting application scenarios with higher requirements for the response speed of the fuse.

[0061] Through the above-mentioned specific embodiments of the present invention, after the internal trigger component 111 generates the first trigger signal S1 or the external system generates the second trigger signal S2, the on-off state of the circuit can be detected. If the first trigger signal S1 or the second trigger signal 2 fails to detonate due to failure of the explosive device or other reasons, and the circuit is not disconnected, the processor 112 generates a third trigger signal S3 to detonate the backup explosive device to ensure that the circuit is disconnected and the safety of the protected system is ensured; and the backup method of the explosive device is flexible and can meet the diverse needs of different users.

[0062] Although the present invention has been described through preferred embodiments, the present invention is not limited to the embodiments described herein but includes various changes and modifications that may be made without departing from the scope of the present invention.

Claims

1. An intelligent fuse, comprising: A conductor, used for electrically connecting to the protected circuit system, and having a fuse connected in series thereto; An internal trigger component, used for generating a first trigger signal according to the voltage across the fuse; An external trigger signal electrical connector, used to couple a second trigger signal generated by an external system to the inside of the smart fuse; A sensor for detecting the on / off state of the conductor; a processor, configured to determine the on / off state of the conductor according to the detection result of the sensor after receiving the first trigger signal or the second trigger signal, and generate a third trigger signal if the conductor is on; an explosive device, configured to generate explosive gas according to a received trigger signal, the explosive device comprising at least a first explosive device and a second explosive device, wherein the first explosive device generates explosive gas according to at least two of the first trigger signal, the second trigger signal and the third trigger signal, and the second explosive device can generate explosive gas according to at least the third trigger signal; and a cutting device for cutting off the conductor under the impetus of the explosion gas; The third trigger signal is generated when the first trigger signal or the second trigger signal fails to detonate the explosive device. 2 . The smart fuse according to claim 1 , wherein the sensor is a Hall sensor.

3. The smart fuse according to claim 1 further comprises a delay circuit for delaying the first trigger signal or the second trigger signal for a preset time before transmitting it to the processor.

4. The smart fuse according to claim 1, wherein the processor is configured to wait for a preset time after receiving the first trigger signal or the second trigger signal, and then read the detection result and determine the on / off state of the conductor.

5. According to the intelligent fuse of claim 1, the first explosion device is configured to generate explosion gas according to the first trigger signal and the second trigger signal; the second explosion device is configured to generate explosion gas according to the third trigger signal.

6. According to the intelligent fuse of claim 1, the first explosion device is configured to generate explosion gas according to the first trigger signal and to generate explosion gas according to the third trigger signal, and the second explosion device is configured to generate explosion gas according to the second trigger signal and to generate explosion gas according to the third trigger signal.

7. The smart fuse according to claim 5 or 6, further comprising a third explosion device, which is configured to generate explosion gas according to the third trigger signal.

8. The smart fuse according to claim 5, further comprising a third explosion device, which is configured to generate explosion gas according to the first trigger signal and to generate explosion gas according to the second trigger signal.

9. The smart fuse according to claim 6, further comprising a third explosion device configured to generate explosion gas according to the second trigger signal and to generate explosion gas according to the third trigger signal.

10. The smart fuse according to claim 6, further comprising a third explosion device configured to generate explosion gas according to the first trigger signal and to generate explosion gas according to the third trigger signal.

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