Anomaly detection device

Abstract

This abnormality detection device (10) comprises a parallel circuit section (11) where multiple conductive paths (20) are connected in parallel, multiple current sensors (12), and an abnormality determination unit (13). The current sensors (12) detect currents respectively flowing through the multiple conductive paths (20). The abnormality determination unit (13) determines an abnormality of the current sensors (12) on the basis of the values detected by the multiple current sensors (12). The abnormality detection device (10) detects currents dispersed in the multiple conductive paths (20) by using the respective current sensors (12) and determines an abnormality of the current sensors (12) on the basis of the detection values. Consequently, because this configuration allows the current tolerance of the individual current sensors (12) to be reduced, the size of the current sensors (12) can be easily reduced.

Description

[Technical field]

[0001] The present disclosure relates to an anomaly detection device. [Background technology]

[0002] Patent Document 1 discloses a device for diagnosing errors in a current sensor. This device includes two current sensors that measure the value of a current flowing through the same path. This device diagnoses errors in the current sensors based on a comparison result of the measured values ​​of the two current sensors. Note that a device for detecting an abnormality in a current sensor is also disclosed in Patent Document 2. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2021-515194 [Patent Document 2] JP 2013-90474 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the technology for detecting an abnormality in a current sensor as described above, there is a demand for miniaturization of the current sensor.

[0005] The present disclosure provides a technique that facilitates miniaturization of a current sensor in a configuration for detecting an abnormality in the current sensor. [Means for solving the problem]

[0006] The abnormality detection device of the present disclosure comprises: a parallel circuit portion in which a plurality of conductive paths are connected in parallel; A plurality of current sensors; An abnormality determination unit, Each of the current sensors detects a current flowing through each of the plurality of conductive paths; The abnormality determination unit determines an abnormality in the current sensor based on detection values ​​of the plurality of current sensors. Effect of the Invention

[0007] The technology disclosed herein can facilitate miniaturization of a current sensor in a configuration for detecting an abnormality in the current sensor. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a configuration diagram that illustrates a schematic example of a power supply system including an abnormality detection device according to a first embodiment. [Diagram 2] FIG. 2 is a configuration diagram that illustrates a schematic example of a power supply system including an abnormality detection device according to the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] In the following, embodiments of the present disclosure are listed and illustrated.

[0010] [1] A parallel circuit portion in which a plurality of conductive paths are connected in parallel; A plurality of current sensors; An abnormality determination unit, Each of the current sensors detects a current flowing through each of the plurality of conductive paths; The abnormality determination unit determines an abnormality of the current sensor based on detection values ​​of the plurality of current sensors. Anomaly detection device.

[0011] The anomaly detection device detects the current distributed to the multiple conductive paths with each current sensor and determines an anomaly in the current sensor based on the detected value. Therefore, with this configuration, the current withstand capacity of each current sensor can be reduced, making it easier to miniaturize the current sensors.

[0012] [2] The plurality of conductive paths include a first conductive path and a second conductive path connected in parallel to each other, the plurality of current sensors include a first current sensor that detects a current flowing through the first conductive path and a second current sensor that detects a current flowing through the second conductive path; The abnormality determination unit determines that an abnormality has occurred when at least a difference between a detection value of the first current sensor and a detection value of the second current sensor falls outside a predetermined numerical range. The abnormality detection device according to [1].

[0013] According to this configuration, the configuration for determining whether or not the current sensor is abnormal can be further simplified.

[0014] [3] The parallel circuit unit is provided between a power supply unit and a power supply target to which power based on the power supply unit is supplied, The power supply device further includes a cutoff unit that switches from a permissive state that permits power supply from the power supply unit side to the power supply target side via the parallel circuit unit to a cutoff state that cuts off the power supply. An abnormality detection device according to [1] or [2].

[0015] According to this configuration, the cutoff unit switches from the permitting state to the cutoff state, so that the power supply from the power supply unit side to the power supply target side via the parallel circuit unit can be cut off.

[0016] [4] A control unit that switches the interrupter from the permissive state to the interrupted state based on a detection value of at least one of the multiple current sensors. The abnormality detection device according to [3].

[0017] According to this configuration, the power supply from the power supply unit to the power supply target via the parallel circuit unit can be cut off based on the detection value of the current sensor. Also, the abnormality determination unit can determine an abnormality in the current sensor used to determine switching of the cutoff unit.

[0018] [5] The control unit determines whether or not each of the conductive paths is in an overcurrent state based on the detection values ​​of each of the current sensors, and when it determines that at least one of the conductive paths is in the overcurrent state, switches the interrupting unit from the permissive state to the interrupting state. The abnormality detection device according to [4].

[0019] According to this configuration, the multiple current sensors used to determine an abnormality can be effectively used for rapid switching of the interrupter.

[0020] [6] The control unit determines whether or not each of the conductive paths is in an overcurrent state based on the detection values ​​of each of the current sensors, and when it determines that two or more of the conductive paths are in the overcurrent state, switches the interrupting unit from the permissive state to the interrupting state. The abnormality detection device according to [4].

[0021] According to this configuration, the multiple current sensors used to determine an abnormality can be effectively utilized to prevent erroneous determination of an overcurrent state.

[0022] [7] The parallel circuit unit is provided between a power supply unit and a power supply target to which power based on the power supply unit is supplied, One end of the parallel circuit section is electrically connected to a power supply section-side conductive path provided on the power supply section side of the parallel circuit section, and the other end of the parallel circuit section is electrically connected to a target-side conductive path provided on the power supply target side of the parallel circuit section. An abnormality detection device according to any one of [1] to [6].

[0023] According to this configuration, it is possible to detect an abnormality in the current sensor that detects the current supplied from the power supply unit to the power supply target.

[0024] [8] Each of the current sensors has a shunt resistor provided in each of the conductive paths. An abnormality detection device according to any one of [1] to [7].

[0025] This configuration makes it easy to simplify the configuration of the current sensor.

[0026] [9] Each of the current sensors has a magnetic detection unit that detects the magnetism generated by the current flowing through each of the conductive paths and converts it into an electric signal. An abnormality detection device according to any one of [1] to [7].

[0027] According to this configuration, it is possible to detect the current flowing through the conductive path without providing a resistor in the conductive path.

[0028] First Embodiment 1. Power supply system 1 configuration 1 shows a power supply system 1 including an abnormality detection device 10 according to a first embodiment. The power supply system 1 is a system mounted on a vehicle and capable of supplying power to various power supply targets. The power supply system 1 includes a power supply unit 2, a load 3, a power path 4, and the abnormality detection device 10.

[0029] The power path 4 is provided between the power supply unit 2 and the load 3, and functions as a path for supplying power from the power supply unit 2 to the load 3. The power path 4 includes a positive electrode side conductive path 5 and a negative electrode side conductive path 6.

[0030] The power supply unit 2 is an on-board power supply capable of supplying power to the load 3. The power supply unit 2 is configured as, for example, a known on-board battery such as a lead battery. The power supply unit 2 may be configured by a battery other than a lead battery, and may have a power supply means other than a battery instead of or in addition to the battery. The positive electrode of the power supply unit 2 is electrically connected to one end of the positive electrode side conductive path 5 in a configuration in which it is short-circuited to one end of the positive electrode side conductive path 5. The negative electrode of the power supply unit 2 is electrically connected to one end of the negative electrode side conductive path 6 in a configuration in which it is short-circuited to one end of the negative electrode side conductive path 6. The power supply unit 2 applies a predetermined DC voltage (for example, 12 V) to the power path 4 when fully charged. The power supply unit 2 supplies power to the power path 4, and supplies power to the load 3 via the power path 4.

[0031] The load 3 corresponds to an example of a power supply target, and is an electrical component mounted on a vehicle. The load 3 operates by receiving power supplied via a power path 4. One end of the load 3 is electrically connected to the other end of the positive-side conductive path 5 in a configuration in which it is short-circuited to the other end of the positive-side conductive path 5. The other end of the load 3 is electrically connected to the other end of the negative-side conductive path 6 in a configuration in which it is short-circuited to the other end of the negative-side conductive path 6.

[0032] The abnormality detection device 10 is mounted on a vehicle and used in a power supply system 1. The abnormality detection device 10 includes a parallel circuit unit 11, a plurality of current sensors 12, an abnormality determination unit 13, a breaker unit 14, and a control unit 15.

[0033] The parallel circuit unit 11 has a configuration in which a plurality of conductive paths 20 are connected in parallel. The parallel circuit unit 11 is provided between the power supply unit 2 and the load 3. The parallel circuit unit 11 is provided in the power path 4 (more specifically, the negative side conductive path 6) and constitutes a part of the power path 4 (more specifically, the negative side conductive path 6). In other words, the parallel circuit unit 11 constitutes a part of a path that supplies power from the power supply unit 2 to the load 3. One end of the parallel circuit unit 11 is electrically connected to the power supply unit side conductive path 7 in a configuration in which the parallel circuit unit 11 is short-circuited to the power supply unit side conductive path 7 provided on the power supply unit 2 side of the parallel circuit unit 11. The other end of the parallel circuit unit 11 is electrically connected to the target side conductive path 8 provided on the load 3 side of the parallel circuit unit 11. The plurality of conductive paths 20 are configured to be connected in parallel between the power supply unit side conductive path 7 and the target side conductive path 8.

[0034] The power supply unit side conductive path 7 and the target side conductive path 8 constitute a part of the negative electrode side conductive path 6. One end of the power supply unit side conductive path 7 is electrically connected to the negative electrode of the power supply unit 2 in a configuration short-circuited to the negative electrode of the power supply unit 2. The other end of the power supply unit side conductive path 7 is electrically connected to one end of the parallel circuit unit 11 in a configuration short-circuited to one end of the parallel circuit unit 11. One end of the target side conductive path 8 is electrically connected to the other end of the load 3 in a configuration short-circuited to the other end of the parallel circuit unit 11. The other end of the target side conductive path 8 is electrically connected to the other end of the parallel circuit unit 11 in a configuration short-circuited to the other end of the parallel circuit unit 11.

[0035] The plurality of conductive paths 20 include a first conductive path 20A and a second conductive path 20B. The first conductive path 20A and the second conductive path 20B are configured to be connected in parallel between the power supply unit side conductive path 7 and the target side conductive path 8. One end of each conductive path 20 is electrically connected to the power supply unit side conductive path 7 (more specifically, the other end of the power supply unit side conductive path 7) in a configuration in which it is short-circuited to the power supply unit side conductive path 7 (more specifically, the other end of the power supply unit side conductive path 7). The other end of each conductive path 20 is electrically connected to the target side conductive path 8 (more specifically, the other end of the target side conductive path 8) in a configuration in which it is short-circuited to the target side conductive path 8 (more specifically, the other end of the target side conductive path 8).

[0036] Each current sensor 12 detects a current flowing through each conductive path 20. The multiple current sensors 12 include a first current sensor 12A and a second current sensor 12B. The first current sensor 12A detects a current flowing through the first conductive path 20A. The second current sensor 12B detects a current flowing through the second conductive path 20B. Information capable of identifying the detection value of each current sensor 12 is input to the abnormality determination unit 13 and the control unit 15, respectively.

[0037] Each current sensor 12 has a shunt resistor 21 provided in each conductive path 20, and a differential amplifier circuit 22 that amplifies and outputs a potential difference across the shunt resistor 21. One end of each shunt resistor 21 is electrically connected to the power supply unit side conductive path 7 (more specifically, the other end of the power supply unit side conductive path 7) in a configuration in which it is shorted to the power supply unit side conductive path 7 (more specifically, the other end of the power supply unit side conductive path 7). The other end of each shunt resistor 21 is electrically connected to the target side conductive path 8 (more specifically, the other end of the target side conductive path 8) in a configuration in which it is shorted to the target side conductive path 8 (more specifically, the other end of the target side conductive path 8).

[0038] The first current sensor 12A includes a first shunt resistor 21A provided in the first conductive path 20A and a first differential amplifier circuit 22A that amplifies and outputs a potential difference between both ends of the first shunt resistor 21A. The second current sensor 12B includes a second shunt resistor 21B provided in the second conductive path 20B and a second differential amplifier circuit 22B that amplifies and outputs a potential difference between both ends of the second shunt resistor 21B. The resistance value of the first shunt resistor 21A is the same as the resistance value of the second shunt resistor 21B.

[0039] The abnormality determination unit 13 is configured to include an information processing device such as an MCU (Micro Controller Unit). The detection values ​​of the current sensors 12 are input to the abnormality determination unit 13. The abnormality determination unit 13 determines an abnormality of the current sensors 12 based on the detection values ​​of the current sensors 12. In this embodiment, the abnormality determination unit 13 determines that at least one of the first current sensor 12A and the second current sensor 12B is abnormal based on the detection value of the first current sensor 12A and the detection value of the second current sensor 12B. The abnormality determination unit 13 determines an abnormality when the difference between the detection value of the first current sensor 12A and the detection value of the second current sensor 12B falls outside a predetermined numerical range.

[0040] The interrupter 14 has a function of switching from an allowable state, which allows power supply from the power supply unit 2 side to the load 3 side via the parallel circuit unit 11, to a cutoff state, which cuts off the power supply. In this embodiment, the interrupter 14 has a switch 14A. The switch 14A may be a semiconductor switch such as a FET (Field Effect Transistor) or a mechanical switch. The interrupter 14 switches to an allowable state when the switch 14A switches to an on state, and switches to a cutoff state when the switch 14A switches to an off state. In this embodiment, the interrupter 14 is provided in the target-side conductive path 8, but may be provided in the power supply unit-side conductive path 7 or the positive-side conductive path 5.

[0041] The control unit 15 is configured to include an information processing device such as an MCU (Micro Controller Unit). The detection values ​​of each current sensor 12 are input to the control unit 15. The control unit 15 determines whether each conductive path 20 is in an overcurrent state based on the detection value of each current sensor 12. For example, when the detection value of a current sensor 12 exceeds a threshold value, the control unit 15 determines that the conductive path 20 detected by the current sensor 12 is in an overcurrent state. When the control unit 15 determines that at least one conductive path 20 (in this embodiment, at least one of the first conductive path 20A and the second conductive path 20B) is in an overcurrent state, the control unit 15 switches the interruption unit 14 from a permissive state to a cutoff state.

[0042] 2. Example of operation of the anomaly detection device 10 The control unit 15 normally keeps the switch 14A in an on state and maintains the interruption unit 14 in an allowable state. In this state, power can be supplied from the power supply unit 2 to the load 3. The abnormality determination unit 13 repeatedly determines whether or not the difference between the detection value of the first current sensor 12A and the detection value of the second current sensor 12B is outside a predetermined numerical range. Then, when the abnormality determination unit 13 determines that the difference between the detection value of the first current sensor 12A and the detection value of the second current sensor 12B is outside the predetermined numerical range, it determines that an abnormality has occurred.

[0043] The control unit 15 repeatedly determines whether or not at least one of the first conductive path 20A and the second conductive path 20B is in an overcurrent state. When the control unit 15 determines that at least one of the first conductive path 20A and the second conductive path 20B is in an overcurrent state, the control unit 15 switches the interrupting unit 14 from the permissive state to the interrupting state.

[0044] 3. Example of the effect of the anomaly detection device 10 The abnormality detection device 10 detects the current distributed to the multiple conductive paths 20 by each current sensor 12, and determines an abnormality in the current sensor 12 based on the detected value. Therefore, with this configuration, the current withstand capacity of each current sensor 12 can be reduced. In this embodiment, each conductive path 20 is provided with a shunt resistor 21 having the same resistance value. Therefore, the current flowing through each conductive path 20 is halved, and it becomes possible to use a current sensor 12 with half the current withstand capacity compared to a configuration in which the current sensor 12 is provided in a path other than the parallel circuit section 11 (for example, the power supply section side conductive path 7 or the target side conductive path 8). Therefore, it is easy to miniaturize the current sensor 12.

[0045] Furthermore, the abnormality determination unit 13 determines that an abnormality has occurred when at least the difference between the detection value of the first current sensor 12A and the detection value of the second current sensor 12B is outside a predetermined numerical range. With this configuration, the configuration for determining an abnormality in the current sensor 12 can be further simplified.

[0046] Furthermore, the abnormality detection device 10 includes a cutoff unit 14 that switches from a permissive state that allows power supply from the power supply unit 2 to the load 3 via the parallel circuit unit 11 to a cutoff state that cuts off the power supply. According to this configuration, the cutoff unit 14 switches from the permissive state to the cutoff state, so that the power supply from the power supply unit 2 to the load 3 via the parallel circuit unit 11 can be cut off.

[0047] Furthermore, the abnormality detection device 10 includes a control unit 15 that switches the interrupter unit 14 from a permissive state to a cut-off state based on a detection value of at least one of the multiple current sensors 12. With this configuration, it is possible to cut off the power supply from the power supply unit 2 side to the load 3 side via the parallel circuit unit 11 based on the detection value of the current sensor 12. Also, an abnormality in the current sensor 12 used to determine whether to switch the interrupter unit 14 can be determined by the abnormality determination unit 13.

[0048] Furthermore, the control unit 15 determines whether each conductive path 20 is in an overcurrent state based on the detection value of each current sensor 12, and switches the interrupting unit 14 from the permissive state to the interrupting state when it determines that at least one conductive path 20 is in an overcurrent state. According to this configuration, the multiple current sensors 12 (in this embodiment, the first current sensor 12A and the second current sensor 12B) used to determine an abnormality can be effectively used for rapid switching of the interrupting unit 14.

[0049] Furthermore, each current sensor 12 has a shunt resistor 21 provided in each conductive path 20. According to this configuration, the configuration of the current sensor 12 can be easily simplified.

[0050] <Second embodiment> A power supply system 201 of the second embodiment is different from the power supply system 1 of the first embodiment in the configuration of the current sensor, but is otherwise common to both. In the following description, the same components as those of the first embodiment are denoted by the same reference numerals and detailed description thereof will be omitted.

[0051] 2 shows a power supply system 201 of the second embodiment. The power supply system 201 includes a power supply unit 2, a load 3, a power path 4, and an abnormality detection device 210. The abnormality detection device 210 is mounted on a vehicle and used in the power supply system 201. The abnormality detection device 210 includes a parallel circuit unit 211, a plurality of current sensors 212, an abnormality determination unit 13, an interrupter unit 14, and a control unit 15.

[0052] The parallel circuit section 211 has a configuration in which a plurality of conductive paths 220 are connected in parallel. The parallel circuit section 211 is provided between the power supply section 2 and the load 3. The parallel circuit section 211 is provided in the power path 4 (more specifically, the negative side conductive path 6) and constitutes a part of the power path 4 (more specifically, the negative side conductive path 6). In other words, the parallel circuit section 211 constitutes a part of a path that supplies power from the power supply section 2 to the load 3. One end of the parallel circuit section 211 is electrically connected to the power supply section side conductive path 7 in a configuration in which the power supply section side conductive path 7 is short-circuited to the power supply section side conductive path 7 provided on the power supply section 2 side of the parallel circuit section 211. The other end of the parallel circuit section 211 is electrically connected to the target side conductive path 8 provided on the load 3 side of the parallel circuit section 211. The plurality of conductive paths 220 are configured to be connected in parallel between the power supply section side conductive path 7 and the target side conductive path 8.

[0053] The plurality of conductive paths 220 include a first conductive path 220A and a second conductive path 220B. The first conductive path 220A and the second conductive path 220B are configured to be connected in parallel between the power supply unit side conductive path 7 and the target side conductive path 8. One end of each conductive path 220 is electrically connected to the power supply unit side conductive path 7 (more specifically, the other end of the power supply unit side conductive path 7) in a configuration in which it is short-circuited to the power supply unit side conductive path 7 (more specifically, the other end of the power supply unit side conductive path 7). The other end of each conductive path 220 is electrically connected to the target side conductive path 8 (more specifically, the other end of the target side conductive path 8) in a configuration in which it is short-circuited to the target side conductive path 8 (more specifically, the other end of the target side conductive path 8).

[0054] Each current sensor 212 detects a current flowing through each conductive path 220. The multiple current sensors 212 include a first current sensor 212A and a second current sensor 212B. The first current sensor 212A detects a current flowing through the first conductive path 220A. The second current sensor 212B detects a current flowing through the second conductive path 220B. Information capable of identifying the detection value of each current sensor 212 is input to the abnormality determination unit 13 and the control unit 15, respectively.

[0055] Each current sensor 212 is a non-contact type sensor arranged in a non-contact manner with respect to a conductive path 220 that is a target for detecting a current. Each current sensor 212 has a magnetic detector 221 that detects a magnetism generated by a current flowing through each conductive path 220 and converts the magnetism into an electric signal. The magnetic detector 221 may have a Hall element or a magnetoresistance effect element. The current sensor 212 is in a non-contact manner with respect to the conductive path 220. In other words, the other end of the power supply unit side conductive path 7 is electrically connected to the other end of the target side conductive path 8 via the parallel circuit portion 211 in a configuration in which the other end of the power supply unit side conductive path 7 is short-circuited to the other end of the target side conductive path 8.

[0056] The first current sensor 212A has a first magnetic detector 221A provided on the first conductive path 220A. The first magnetic detector 221A detects the magnetism generated by the current flowing through the first conductive path 220A and converts it into an electric signal. The second current sensor 212B has a second magnetic detector 221B provided on the second conductive path 220B. The second magnetic detector 221B detects the magnetism generated by the current flowing through the second conductive path 220B and converts it into an electric signal.

[0057] The abnormality determination unit 13 determines an abnormality in the current sensor 212 based on the detection value of each current sensor 212. The abnormality determination unit 13 determines an abnormality when the difference between the detection value of the first current sensor 212A and the detection value of the second current sensor 212B falls outside a predetermined numerical range.

[0058] The cutoff unit 14 has a function of switching from a permissive state in which power supply from the power supply unit 2 side to the load 3 side via the parallel circuit unit 211 is permitted to a cutoff state in which power supply is cut off.

[0059] The control unit 15 determines whether each conductive path 220 is in an overcurrent state based on the detection value of each current sensor 212. For example, when the detection value of a current sensor 212 exceeds a threshold value, the control unit 15 determines that the conductive path 220 detected by the current sensor 212 is in an overcurrent state. For example, when the control unit 15 determines that at least one of the first conductive path 220A and the second conductive path 220B is in an overcurrent state, the control unit 15 switches the interrupting unit 14 from the permissive state to the interrupting state.

[0060] According to this configuration, the current flowing through the conductive path 220 can be detected without providing a resistor in the conductive path 220.

[0061] <Other embodiments> The present disclosure is not limited to the embodiments described above and in the drawings. For example, the features of the above or later described embodiments can be combined in any combination within a range that does not contradict. In addition, any feature of the above or later described embodiments can be omitted unless it is clearly stated as essential. Furthermore, the above-mentioned embodiment may be modified as follows.

[0062] The number of the conductive paths connected in parallel with each other may be three or more. The number of the current sensors may be three or more.

[0063] The method of the abnormality determination unit determining an abnormality is not limited to a method of determining an abnormality when the difference between the detection value of the first current sensor and the detection value of the second current sensor is outside a predetermined numerical range. For example, the abnormality determination unit may be configured to determine an abnormality when the difference between the integrated value or average value of the detection values ​​of the first current sensor in a predetermined period and the integrated value or average value of the detection values ​​of the second current sensor in a predetermined period is outside a predetermined numerical range. With this configuration, for example, when the detection value of the current sensor is AD converted, an error caused by AD conversion can be reduced. Alternatively, the abnormality determination unit may be configured to perform a determination of whether or not the numerical range is exceeded a predetermined number of times, and determine an abnormality when the proportion of the values ​​that are determined to be out of the numerical range exceeds a reference value.

[0064] The method by which the control unit determines an overcurrent state is not limited to a method in which the control unit determines that the conductive path detected by the current sensor is in an overcurrent state when the detection value of the current sensor exceeds a threshold value. For example, the control unit may determine that the conductive path detected by the current sensor is in an overcurrent state when an integrated value or average value of multiple detection values ​​of the current sensor in a predetermined period of time exceeds a threshold value. As another example, the control unit may determine that the conductive path detected by the current sensor is in an overcurrent state when the state in which the detection value of the current sensor exceeds the threshold value continues for a determination time. Multiple combinations of threshold values ​​and determination times may be prepared.

[0065] The condition for the control unit to switch the interrupting unit to the interrupting state is not limited to the determination that at least one of the first conductive path and the second conductive path is in an overcurrent state. For example, the control unit may be configured to switch the interrupting unit to the interrupting state when it determines that both the first conductive path and the second conductive path are in an overcurrent state. With this configuration, a plurality of current sensors used for determining an abnormality can be effectively utilized to prevent erroneous determination of an overcurrent state. As another example, the control unit may be configured to monitor only one of the first conductive path and the second conductive path, and switch the interrupting unit to the interrupting state when it determines that the monitored conductive path is in an overcurrent state. In addition, in a configuration in which there are three or more conductive paths, the control unit may be configured to switch the interrupting unit to the interrupting state when it determines that all conductive paths are in an overcurrent state, or may be configured to switch the interrupting unit to the interrupting state when it determines that a predetermined number of conductive paths are in an overcurrent state.

[0066] The interrupting unit may be configured such that it cannot return to an open state after being in the interrupted state. For example, the interrupting unit may be a pyrotechnic circuit breaker that cuts off the power path when a drive current is supplied thereto.

[0067] The resistance values ​​of the shunt resistors provided in the respective conductive paths do not have to be the same. Even with this configuration, it is possible to use a current sensor with a smaller short-circuit resistance.

[0068] The parallel circuit portion may be provided on the positive electrode side conductive path instead of on the negative electrode side conductive path.

[0069] The abnormality detection device may not include a cutoff unit.The abnormality detection device may not include a control unit.

[0070] It should be noted that the embodiments disclosed herein are illustrative and not restrictive in all respects. The scope of the present invention is not limited to the embodiments disclosed herein, and is intended to include all modifications within the scope indicated by the claims or within the scope equivalent to the claims. [Explanation of symbols]

[0071] 1: Power System 2: Power supply section 3: Load (power supply target) 4: Power line 5: Positive conductive path 6: Negative conductive path 7: Power supply side conductive path 8: Target conductive path 10: Anomaly detection device 11:Parallel circuit section 12: Current sensor 12A: First current sensor 12B: Second current sensor 13: Abnormality determination section 14: Breaking section 14A: Switch 15: Control section 20: Conductive path 20A: First conductive path 20B: 2nd conductive path 21: Shunt resistor 21A: First shunt resistor 21B: Second shunt resistor 22: Differential amplifier circuit 22A: First differential amplifier circuit 22B: Second differential amplifier circuit 201: Power supply system 210: Anomaly detection device 211: Parallel circuit section 212: Current sensor 212A: First current sensor 212B: Second current sensor 220: Conductive path 220A: First conductive path 220B: 2nd conductive path 221: Magnetic detector 221A: First magnetic detector 221B: Second magnetic detector

Claims

1. a parallel circuit portion in which a plurality of conductive paths are connected in parallel; A plurality of current sensors; An abnormality determination unit, Each of the current sensors detects a current flowing through each of the plurality of conductive paths; the abnormality determination unit determines an abnormality in the current sensor based on detection values ​​of the plurality of current sensors; the parallel circuit unit is provided between a power supply unit and a power supply target to which power based on the power supply unit is supplied, One end of the parallel circuit unit is short-circuited to one power supply unit-side conductive path provided on the power supply unit side of the parallel circuit unit, and the other end of the parallel circuit unit is short-circuited to one target-side conductive path provided on the power supply target side of the parallel circuit unit. Anomaly detection device.

2. the plurality of conductive paths include a first conductive path and a second conductive path connected in parallel to each other, the plurality of current sensors include a first current sensor that detects a current flowing through the first conductive path and a second current sensor that detects a current flowing through the second conductive path; The abnormality determination unit determines that an abnormality has occurred when at least a difference between a detection value of the first current sensor and a detection value of the second current sensor falls outside a predetermined numerical range. The abnormality detection device according to claim 1 .

3. a cutoff unit that switches from a permissive state that permits power supply from the power supply unit side to the power supply target side via the parallel circuit unit to a cutoff state that cuts off the power supply The abnormality detection device according to claim 1 or 2.

4. a control unit that switches the interrupter from the permitting state to the interrupting state based on a detection value of at least one of the plurality of current sensors; The abnormality detection device according to claim 3 .

5. The control unit determines whether or not each of the conductive paths is in an overcurrent state based on the detection values ​​of each of the current sensors, and when it determines that at least one of the conductive paths is in the overcurrent state, switches the interrupting unit from the permissive state to the interrupting state. The abnormality detection device according to claim 4.

6. The control unit determines whether or not each of the conductive paths is in an overcurrent state based on the detection values ​​of each of the current sensors, and when it determines that two or more of the conductive paths are in the overcurrent state, switches the interrupting unit from the permissive state to the interrupting state. The abnormality detection device according to claim 4.

7. (delete)

8. Each of the current sensors has a shunt resistor provided in each of the conductive paths. The abnormality detection device according to claim 1 .

9. Each of the current sensors has a magnetic detection unit that detects a magnetic field generated by a current flowing through each of the conductive paths and converts the magnetic field into an electric signal. The abnormality detection device according to claim 1 .

Images