WO2023095535A1

WO2023095535A1 - Interrupting device

Info

Publication number: WO2023095535A1
Application number: PCT/JP2022/040163
Authority: WO
Inventors: 勇貴藤村; 貴史川上; 嵩大倉冨
Original assignee: 株式会社オートネットワーク技術研究所; 住友電装株式会社; 住友電気工業株式会社
Priority date: 2021-11-26
Filing date: 2022-10-27
Publication date: 2023-06-01

Abstract

Provided is an interrupting device capable of satisfactorily interrupting the energization of a power path.　An interrupting device (30) interrupts the energization of a power path (Pp) having a first conductive path (31) and a second conductive path (32). The interrupting device (30) has: a pyro-switch (34A) provided between the first conductive path (31) and the second conductive path (32); and a fuse unit (34B) provided in parallel with the pyro-switch (34A) between the first conductive path (31) and the second conductive path (32). When the pyro-switch (34A) is in an interrupted state and the fuse unit (34B) is in a conductive state, current flows through the fuse unit (34B) between the first conductive path (31) and the second conductive path (32).

Description

breaker

The present disclosure relates to a blocking device.

In Patent Document 1, when a vehicle collision is detected, a control system interposed in a power path between a high-voltage battery and a plurality of loads switches the power path between the high-voltage battery side and the plurality of loads. A technique for dividing into a side and a side is disclosed.

U.S. Pat. No. 9,221,343

Patent Document 1 has a configuration in which a relay switch is used to separate the battery side and a plurality of load sides. Due to the structure of the relay switch, it is not possible to shorten the time required from the start of disconnection to the end of disconnection. In order to make this time shorter, it is conceivable to use a pyro-switch. However, using a pyro-switch may increase surge voltage compared to using a relay switch.

The present disclosure has been made based on the circumstances described above, and aims to provide a breaker that can satisfactorily cut off the energization of a power line.

The blocking device of the present disclosure is
A circuit breaker for interrupting energization of a power path having a first conductive path and a second conductive path,
a pyro-switch provided between the first conductive path and the second conductive path;
a fuse section provided in parallel with the pyro-switch between the first conductive path and the second conductive path;
has
When the pyro-switch is in a cut-off state and the fuse section is in a conducting state, current flows between the first conductive path and the second conductive path through the fuse section.

According to the present disclosure, it is possible to satisfactorily cut off the energization of the power path.

FIG. 1 is a block diagram illustrating a blocking device according to Embodiment 1. FIG. FIG. 2 is a flowchart illustrating the flow of processing in the blocking device according to the first embodiment; FIG. 3 is a block diagram illustrating a blocking device according to Embodiment 2. FIG. FIG. 4 is a block diagram illustrating a blocking device according to Embodiment 3. FIG.

[Description of Embodiments of the Present Disclosure]
First, the embodiments of the present disclosure are listed and described.

[1] The interrupting device of the present disclosure interrupts energization of a power path having a first conductive path and a second conductive path. The breaker includes a pyro-switch provided between a first conductive path and a second conductive path, and a fuse portion provided in parallel with the pyro-switch between the first conductive path and the second conductive path. have. In the breaker, when the pyro-switch is in a cut-off state and the fuse section is in a conducting state, current flows between the first conducting path and the second conducting path through the fuse section.

The breaker of [1] above is capable of cutting off the pyro-switch and immediately reducing the current in the power path. Moreover, if the other energization path (the fuse part side energization path) is maintained after the pyro-switch has been cut off, the surge caused by the pyro-switch cut-off can be suppressed. If the fuse remains energized after the pyro-switch is shut off, there is a concern that the current flowing through the fuse will rise sharply when the pyro-switch is shut off. , the continuation of the excessive current is suppressed.

[2] The interrupting device of [1] above may have a current detection unit that detects the current value of the power path, and a control device that switches the pyro-switch to the interruption state based on the detected value of the current detection unit.

The breaker of [2] above can switch the pyro-switch to the cut-off state in a configuration independent from the outside by means of the current detection unit and the control device provided in the breaker itself. It is possible to easily realize a configuration that can cut off the two conductive paths.

[3] In the breaking device of [1] or [2] above, the fuse portion may be a thermal fuse that is blown by its own heat generation.

In the breaker device of [3] above, after the pyro-switch completes breaking, the current flows through the fuse portion to progress fusing, so the first conducting path and the second conducting path can be reliably broken.

[4] The interrupting device of [3] above has a current detector that detects the current value of the power line, and a control device that switches the pyro-switch to the interrupted state based on the detected value of the current detector. . The controller can switch the pyro-switch to the cut-off state before the fuse blows, based on the value detected by the current detector.

The breaking device of [4] above is capable of switching the pyro-switch to the breaking state when the current in the power path becomes excessive. For example, when the control device switches the pyro-switch to the cut-off state based on the value detected by the current detector, the current flowing through the power path concentrates on the fuse and the fuse blows, thus reliably disconnecting the power path. can do.

[5] In the breaking device of [1] or [2] above, the fuse section may be a semiconductor fuse, and may further include a breaking control section that performs control to break the fuse section after breaking the pyro-switch.

The breaking device of [5] above can precisely control the breaking of the fuse section by the breaking control section.

[6] Any one of the breaker devices from [1] to [5] above has a signal path to which a break signal is input from an external device provided outside the breaker device, and cuts off the signal path. A pyro-switch may switch to a blocking state when a signal is input.

The shut-off device of [6] above can be configured so that a shut-off signal is input from an external device via a signal path according to desired specifications, so it is easy to adapt to various variations.

[7] In any one of the interrupting devices from [1] to [6] above, the inter-terminal resistance of the fuse portion may be greater than the inter-terminal resistance of the pyro-switch.

In the circuit breaker of [7] above, in the conductive state, the current flowing through the fuse portion can be made smaller than the current flowing through the pyro-switch, so a smaller fuse portion can be adopted.
[Details of the embodiment of the present disclosure]

<Embodiment 1>
[Outline of the breaker]
As shown in FIG. 1, the interrupting device 30 includes an electricity storage unit 91, a power line Pp, an interrupting unit 34, a current detecting unit 38, a control device 20, and the like. Interrupting device 30 is configured to apply voltage to load 94 via power path Pp, which is a path through which electric power is transmitted from power storage unit 91 to load 94 . The interrupting device 30 has a function of interrupting the energization of the power path Pp.

The power storage unit 91 is a DC power supply that generates a DC voltage, and power supply means such as a lead battery, LiB, alternator, converter, etc., are used. The power storage unit 91 is provided with a high potential side terminal and a low potential side terminal. The high potential side terminal is electrically connected to the high potential side first conducting path 31A, and the low potential side terminal are electrically connected to the first conductive path 31B on the low potential side. The power storage unit 91 is configured to apply an output voltage having a predetermined potential difference between the

first conducting paths

31A and 31B.

The power path Pp has a first conductive path 31 and a second conductive path 32 . The first conductive path 31 and the second conductive path 32 are power paths that are paths through which power is transmitted between the power storage unit 91 and the load 94 . The first conductive path 31 has a first conductive path 31A on the high potential side and a first conductive path 31B on the low potential side. The second conductive path 32 has a second conductive path 32A on the high potential side and a second conductive path 32B on the low potential side. First conductive path 31 is electrically connected to power storage unit 91 . The second conductive path 32 is electrically connected to the load 94 .

The load 94 is an in-vehicle electronic component, and is applicable to products such as electric components, ECUs, and parts subject to ADAS, for example. A load 94 is electrically connected to the second conductive path 32 .

In the present disclosure, "electrically connected" desirably refers to a configuration in which the objects to be connected are electrically connected to each other (a state in which current can flow) so that the potentials of both objects are equal. However, it is not limited to this configuration. For example, "electrically connected" may be a configuration in which both connection objects are connected in a state in which an electric component is interposed between them and both connection objects are electrically connected.

The cut-off section 34 has a pyro-switch 34A and a fuse section 34B. The cutoff portion 34 is interposed between the high-potential-side first conductive path 31A and the high-potential-side second conductive path 32A. That is, the pyro-switch 34A and the fuse portion 34B are provided between the first conductive path 31 and the second conductive path 32. As shown in FIG. The breaker 34 switches from a conduction state in which electric power is supplied from the high-potential-side first conductive path 31A to the high-potential-side second conductive path 32A, from the high-potential-side first conductive path 31A to the high-potential-side second conductive path 32A. It switches to a cutoff state that cuts off the supply of power to the conductive path 32A.

The pyro-switch 34A allows a current to flow between the high-potential-side first conductive path 31A and the high-potential-side second conductive path 32A through itself when the pyro-switch 34A itself is in a conducting state (energization-permitting state). do. The pyro-switch 34A enters a cut-off state in which a current is cut off from the first conductive path 31A on the high potential side to the second conductive path 32A on the high potential side when a drive signal D is given from the control device 20, which will be described later. do. When the pyro-switch 34A itself is in the cut-off state, the pyro-switch 34A bi-directionally cuts off current flow between the high-potential-side first conductive path 31A and the high-potential-side second conductive path 32A. .

For example, when the drive signal D is given, the pyro-switch 34A ignites the built-in gunpowder and uses the explosive power of the gunpowder to perform an interrupting operation of instantaneously disconnecting the bus bar element built in itself, and enters the cut-off state. Become. Therefore, the pyro-switch 34A can switch to the cut-off state in a short time compared to a relay or the like. The pyro-switch 34A, which has been switched to the cut-off state, does not release the cut-off state and switch to the conductive state allowing current to flow from the high-potential-side first conductive path 31A to the high-potential-side second conductive path 32A. That is, the pyro-switch 34A is maintained in the cut-off state after the cut-off operation.

The fuse section 34B is provided in parallel with the pyro-switch 34A. A thermal fuse, for example, is used for the fuse portion 34B. The terminal-to-terminal resistance of the fuse portion 34B is set to be greater than the terminal-to-terminal resistance of the pyro-switch 34A. The fuse portion 34B allows current to flow through itself between the high-potential-side first conductive path 31A and the high-potential-side second conductive path 32A when the fuse portion 34B itself is in a conducting state (energization-permitting state). do. When the fuse portion 34B itself is in a conductive state (energization-permitting state), if an excessive amount of current flows through the conductive path to the extent that a part of the conductive path built therein fuses, the conductive path generates heat, A part of is fused and cut off. That is, the fuse portion 34B is fused by its own heat generation. In this way, the fuse portion 34B switches to a cutoff state that cuts off the flow of current from the power storage portion 91 side to the load 94 side.

The fuse part 34B interrupts the flow of current between the high-potential-side first conducting path 31A and the high-potential-side second conducting path 32A in both directions when the fuse part 34B itself is in the interrupted state. The fuse unit 34B that has been switched to the interrupted state does not switch to the released state that cancels the interrupted state and permits current to flow from the power storage unit 91 side to the load 94 side. The fuse section 34B takes a longer time than the pyro-switch 34A to switch to the cut-off state.

The current detection unit 38 is interposed in the first conductive path 31A on the high potential side closer to the power storage unit 91 than the cutoff unit 34 is. The current detection unit 38 has, for example, a resistor and a differential amplifier, and has a value indicating the current flowing through the high potential side first conducting path 31A (specifically, the value indicating the current flowing through the high potential side first conducting path 31A). (analog voltage corresponding to the value of the current) can be output as the current value A. The current detector 38 detects the state of the current flowing through the high-potential-side first conductive path 31A.

The control device 20 is composed of circuits, parts, etc. that can perform control such as microcomputers and FPGAs, for example. The control device 20 can perform control to switch the pyro-switch 34A to the cut-off state.

The controller 20 is configured to receive the current value A detected by the current detector 38 in the high-potential-side first conducting path 31A. The control device 20 controls the output of the drive signal D to the pyro-switch 34A based on the current value A (detection value) that is the detection result input from the current detection section 38 . Specifically, when the current value A, which is the detection result of the current detection unit 38, indicates a predetermined overcurrent state, the control device 20 supplies the drive signal D to the pyro-switch 34A to cut off the pyro-switch 34A. Instruct to switch to Note that the predetermined overcurrent state will be described later.

[Regarding the specified overcurrent state]
In a predetermined overcurrent state, the magnitude of the current flowing through the high-potential-side first conductive path 31A is equal to or greater than a predetermined threshold. The predetermined overcurrent state is determined in the control device 20 using the current value A input from the current detection section 38 . Specifically, in some cases, the control device 20 determines that the magnitude of the current value A input from the current detection unit 38 (that is, the current flowing through the first conductive path 31A on the high potential side) is equal to or greater than a predetermined threshold. Corresponds to a given overcurrent condition. The predetermined threshold value is stored in the ROM or the like in the control device 20, for example.

A relay unit 35 is provided in the cutoff device 30 . The relay section 35 has

relays

35A, 35B, 35C and a resistor 35D. The relay 35A is interposed in the second conducting path 32A on the high potential side. The relay 35A switches the high-potential-side second conductive path 32A between a conducting state and a non-conducting state. The

relays

35B and 35C are interposed in the second conductive path 32B on the low potential side. The

relays

35B and 35C switch the low-potential-side second conductive path 32B between a conducting state and a non-conducting state. The resistor 35D is electrically connected in series with the relay 35C. A resistor 35D and a relay 35C electrically connected in series are provided in parallel with the relay 35B.

[About the operation of the breaker]
Next, an example of the operation of the blocking device 30 will be described with reference to FIG. 2 and the like. First, in step S1, a start switch (ignition switch) provided in the vehicle is switched from an off state to an on state. After shifting to step S2, the control device 20 determines whether or not the current flowing through the high potential side first conductive path 31A is in a predetermined overcurrent state. Specifically, the control device 20 determines whether the current value A of the high-potential-side first conductive path 31A detected by the current detection unit 38 is equal to or greater than a predetermined threshold value. If the current value A is equal to or greater than the predetermined threshold value, or if the current value A is less than the predetermined threshold value in step S2, the control device 20 determines that the current flowing through the high potential side first conductive path 31A is not in a predetermined overcurrent state. (No in step S2), the process in FIG. 2 ends.

When the control device 20 determines that the current flowing through the first conductive path 31A on the high potential side is in a predetermined overcurrent state (Yes in step S2), the process proceeds to step S3. After proceeding to step S3, the control device 20 transmits the drive signal D to the pyro-switch 34A.

When the process moves to step S4, the pyro-switch 34A to which the drive signal D is input ignites the built-in explosive. Then, the process proceeds to step S5, and the pyro-switch 34A disconnects the busbar element. At this time, the fuse portion 34B is before the start of fusing (before fusing). That is, the control device 20 switches the pyro-switch 34A to the cut-off state based on the value detected by the current detection section 38 before the fuse section 34B is fused.

When the disconnection of the busbar element is completed in step S5, the process proceeds to step S6. All of the current flowing from the high potential side first conductive path 31A toward the high potential side second conductive path 32A flows into the fuse portion 34B. At this time, the pyro-switch 34A is in a disconnected state, the fuse portion 34B is in a conductive state, and current flows between the first conductive path 31 and the second conductive path 32 via the fuse portion 34B. Then, the process proceeds to step S7, and a part of the conductive path of the fuse portion 34B is fused.

In step S7, mainly the fuse portion 34B cuts off the first conductive path 31A on the high potential side and the second conductive path 32A on the high potential side. The time required from the start of blowing to the completion of blowing in a portion of the conductive path of the fuse portion 34B is longer than the time required from the start of blowing to the completion of blowing in the busbar element of the pyro-switch 34A. For this reason, the fuse portion 34</b>B is fused while suppressing the occurrence of an arc in the breaker portion 34 . In this way, the interrupting device 30 interrupts the high-potential-side first conductive path 31A and the high-potential-side second conductive path 32A, and the process in FIG. 2 ends.

Next, the effects of this configuration will be illustrated.

The cutoff device 30 cuts off the energization of the power path Pp having the first conductive path 31 and the second conductive path 32 . The interrupting device 30 includes a pyro-switch 34A provided between the first conducting path 31 and the second conducting path 32, and a pyro-switch 34A provided between the first conducting path 31 and the second conducting path 32 in parallel with the pyro-switch 34A. and a fuse portion 34B provided. In the interrupting device 30, current flows between the first conducting path 31 and the second conducting path 32 via the fuse part 34B when the pyro-switch 34A is in the interrupting state and the fuse part 34B is in the conducting state. With this configuration, it is possible to cut off the pyro-switch 34A and immediately reduce the current in the power path Pp. In addition, if the other energization path (the fuse portion 34B side energization path) is maintained after the pyro-switch 34A has been cut off, the surge caused by the cut-off of the pyro-switch 34A can be suppressed. If the fuse portion 34B is kept energized after the pyro-switch 34A is turned off, there is a concern that the current flowing through the fuse portion 34B will rise sharply as the pyro-switch 34A is turned off. is cut off, the continuation of the excessive current is suppressed.

The interruption device 30 has a current detection section 38 that detects the current value of the power path Pp, and a control device 20 that switches the pyro-switch 34A to the interruption state based on the detection value of the current detection section 38 . According to this configuration, the pyro-switch 34A can be switched to the cut-off state in a configuration independent from the outside by the current detection unit 38 and the control device 20 provided in the cut-off device 30 itself. and the second conducting path 32 can be easily realized.

The fuse portion 34B of the cutoff device 30 is a thermal fuse that is blown by its own heat generation. According to this configuration, after the pyro-switch 34A completes the disconnection, the current flows through the fuse portion 34B, thereby progressing the fusing.

The breaker 30 has a current detector 38 that detects the current value of the power path Pp, and a controller 20 that switches the pyro-switch 34A to the cut-off state based on the value detected by the current detector 38 . Based on the value detected by the current detector 38, the controller 20 switches the pyro-switch 34A to the cut-off state before the fuse 34B is fused. With this configuration, it is possible to switch the pyro-switch 34A to the cut-off state when the current in the power path Pp becomes excessive. For example, when the controller 20 switches the pyro-switch 34A to the cut-off state based on the value detected by the current detector 38, the current flowing through the power path Pp concentrates on the fuse 34B, causing the fuse 34B to melt. The power path Pp can be reliably cut off.

The inter-terminal resistance of the fuse portion 34B of the breaker 30 is greater than the inter-terminal resistance of the pyro-switch 34A. According to this configuration, the current flowing through the fuse portion 34B can be made smaller than the current flowing through the pyro-switch 34A in the conducting state, so that a smaller component can be adopted as the fuse portion 34B.

<Embodiment 2>
Next, a blocking device 130 according to Embodiment 2 will be described with reference to FIG. The breaker 130 of the second embodiment differs from that of the first embodiment in that a semiconductor fuse is used for the fuse portion 134B of the breaker 134 and that the breaker 130 includes a break control unit 50 for controlling breakage of the fuse portion 134B. The same reference numerals are assigned to the same configurations as in the first embodiment, and the description of the same actions and effects as in the first embodiment is omitted.

As shown in FIG. 3, the cutoff section 134 has a pyro-switch 34A and a fuse section 134B. A semiconductor fuse is used for the fuse portion 134B. The terminal-to-terminal resistance of the fuse portion 134B is greater than the terminal-to-terminal resistance of the pyro-switch 34A. The fuse section 134B is provided in parallel with the pyro-switch 34A. When an excessive current flows through the fuse portion 134B, the cutoff signal C1 is applied according to the cutoff characteristics predetermined by the cutoff control portion 50, thereby causing the fuse portion 134B to move from the first conductive path 31A on the high potential side to the high potential side. A cutoff operation is performed to cut off the flow of current to the second conductive path 32A, and the state is switched to the cutoff state. The fuse section 134B can be switched from the cut-off state to the released state by receiving the conduction signal C2 from the cut-off control section 50 . The fuse portion 134B in the released state allows current to flow from the high-potential-side first conductive path 31A to the high-potential-side second conductive path 32A.

The cut-off control unit 50 is composed of circuits, parts, etc. that can perform control such as microcomputers and FPGAs, for example. The cutoff control unit 50 can perform control to switch the fuse unit 134B between the cutoff state and the released state.

A current value A in the high-potential-side first conductive path 31A detected by the current detection unit 38 is input to the cut-off control unit 50 . The breaking control unit 50 stores breaking characteristics that determine each time until the fuse unit 134B is switched to the breaking state based on each current value A from the current detection unit 38 . This breaking characteristic is stored, for example, in the ROM or the like in the breaking control section 50 in a form that can be compared with the current value A from the current detection section 38, such as table data or a function. For example, the cutoff characteristic is set such that the larger the current value A in the first conductive path 31A on the high potential side, the shorter the time required for switching the fuse portion 134B from the released state to the cutoff state. This cut-off characteristic is set, for example, based on the electrical characteristics of electric parts such as electric wires and connectors included in the power path Pp.

For example, after the pyro-switch 34A switches to the cut-off state, the cut-off control unit 50 starts comparing the cut-off characteristics stored by itself with the current value A from the current detection unit 38. Then, when the break control unit 50 determines that the current value A is large enough to cause the fuse unit 134B to break, it gives the break signal C1 to the fuse unit 134B to switch the fuse unit 134B to the cut state. In other words, the cutoff control section 50 cuts off the fuse section 134B after the pyro-switch 34A is cut off. When the cutoff control unit 50 determines that each current value A input from the current detection unit 38 is not large enough to cause the fuse unit 134B to perform a cutoff operation, the cutoff control unit 50 provides a conduction signal C2 to the fuse unit 134B to The part 134B is brought into the released state.

The fuse portion 134B of the cutoff device 130 is a semiconductor fuse. Further, the breaking device 130 has a breaking control section 50 that performs control to break the fuse section 134B (semiconductor fuse) after breaking the pyro-switch 34A. According to this configuration, it is possible to precisely control the disconnection of the fuse portion 134B by the disconnection control section 50 .

<Embodiment 3>
Next, a blocking device 230 according to Embodiment 3 will be described with reference to FIG. The breaker 230 of the third embodiment differs from the first and second embodiments in that it does not have a current detector and has a signal path 220 that gives a break signal B to the control device 20 . The same reference numerals are assigned to the same configurations as those of the first and second embodiments, and the description of the same actions and effects as those of the first and second embodiments will be omitted.

The signal path 220 is electrically connected to the control device 20 . Signal path 220 is electrically connected to external device 60 . A blocking signal B is input to the signal path 220 from an external device 60 provided outside the blocking device 230 . When the control device 20 receives the cutoff signal B from the external device 60 via the signal path 220, it sends the drive signal D to the pyro-switch 34A. As a result, the pyro-switch 34A switches to the cut-off state.

The blocking device 230 has a signal path 220 to which a blocking signal B is input from an external device 60 provided outside the blocking device 230. When the blocking signal B is input to the signal path 220, the pyro-switch 34A is activated. switches to the blocked state. According to this configuration, it is possible to input the cut-off signal B from the external device 60 via the signal path 220 according to the desired specifications, so it is easy to adapt to various variations.

<Other embodiments>
It should be considered that the embodiments disclosed this time are illustrative in all respects and not restrictive. The scope of the present invention is not limited to the embodiments disclosed this time, but is indicated by the scope of the claims, and is intended to include all modifications within the scope and meaning equivalent to the scope of the claims. be.

Unlike the third embodiment, a configuration may be used in which a cutoff signal is directly input from an external device to the pyro-switch via a signal path.

Unlike the first embodiment, the controller periodically repeats the process of detecting the differential value of the current value, compares the magnitude of the absolute value of the differential value with a threshold value, and determines the state of the current flowing through the power path. It is good also as a structure which determines. Further, the predetermined threshold value may be a fixed value, or may be changed according to the operating condition of the load to determine the state of the current flowing through the power path.

Unlike the second embodiment, the control device and the cut-off control section may be integrally provided as one control device.

A comparator may be used as the current detection unit. In this case, a predetermined high-level signal is output when the current value in the power path indicates a value equal to or greater than a predetermined threshold, and a predetermined low-level signal is output when the current value indicates a value less than the predetermined threshold. do. Alternatively, a configuration using a current transformer or the like may be used.

Unlike the first embodiment, the control device may be configured to switch the pyro-switch to the cut-off state before the end of the blowing of the fuse section based on the value detected by the current detection section. In other words, it is sufficient that the blowing of the fuse section is completed after the pyro-switch is switched to the cut-off state.

20...

Control device

30, 130, 230... Interrupting device 31... First conductive path (power path)
31A... First conductive path on the high potential side 31B... First conductive path on the low potential side 32... Second conductive path (power path)
32A High potential side second conducting path 32B Low potential side second conducting

path

34, 134 Breaking portion

34A Pyro switch

34B, 134B Fuse portion 35

Relay portion

35A, 35B, 35C Relay (relay portion )
35D... Resistor (relay part)
38 Current detection unit 50 Cutoff control unit 60 External device 91 Power storage unit 94 Load 220 Signal path A Current value B Cutoff signal C1 Cutoff signal C2 Continuity signal D Drive signal Pp Power line

Claims

A circuit breaker for interrupting energization of a power path having a first conductive path and a second conductive path,
a pyro-switch provided between the first conductive path and the second conductive path;
a fuse section provided in parallel with the pyro-switch between the first conductive path and the second conductive path;
has
A breaker for allowing a current to flow between the first conducting path and the second conducting path through the fuse portion when the pyro-switch is in the interrupted state and the fuse portion is in the conducting state.
a current detection unit that detects a current value of the power path;
a control device that switches the pyro-switch to the interrupted state based on the detected value of the current detection unit;
2. The interrupting device of claim 1, comprising:
3. The breaking device according to claim 1, wherein the fuse section is a thermal fuse that is blown by its own heat generation.
a current detection unit that detects a current value of the power path;
a control device that switches the pyro-switch to the interrupted state based on the detected value of the current detection unit;
has
4. The breaking device according to claim 3, wherein the control device switches the pyro-switch to the breaking state before the fuse section melts based on the value detected by the current detection section.
the fuse portion is a semiconductor fuse,
3. The breaking device according to claim 1, further comprising a breaking control section for controlling breaking the fuse section after breaking the pyro-switch.
Having a signal path through which a cutoff signal is input from an external device provided outside the cutoff device,
3. The blocking device according to claim 1, wherein the pyro-switch switches to the blocking state when the blocking signal is input to the signal path.
The breaker according to claim 1 or 2, wherein the resistance between terminals of the fuse portion is greater than the resistance between terminals of the pyro-switch.