WO2024247153A1 - 遮断制御装置 - Google Patents

遮断制御装置 Download PDF

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Publication number
WO2024247153A1
WO2024247153A1 PCT/JP2023/020221 JP2023020221W WO2024247153A1 WO 2024247153 A1 WO2024247153 A1 WO 2024247153A1 JP 2023020221 W JP2023020221 W JP 2023020221W WO 2024247153 A1 WO2024247153 A1 WO 2024247153A1
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WO
WIPO (PCT)
Prior art keywords
sensor
overcurrent
signal
unit
conductive path
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2023/020221
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English (en)
French (fr)
Japanese (ja)
Inventor
捷仁 鴫田
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Sumitomo Wiring Systems Ltd
AutoNetworks Technologies Ltd
Sumitomo Electric Industries Ltd
Original Assignee
Sumitomo Wiring Systems Ltd
AutoNetworks Technologies Ltd
Sumitomo Electric Industries Ltd
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Application filed by Sumitomo Wiring Systems Ltd, AutoNetworks Technologies Ltd, Sumitomo Electric Industries Ltd filed Critical Sumitomo Wiring Systems Ltd
Priority to PCT/JP2023/020221 priority Critical patent/WO2024247153A1/ja
Priority to JP2025523783A priority patent/JPWO2024247153A1/ja
Publication of WO2024247153A1 publication Critical patent/WO2024247153A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for DC applications
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00—Circuit arrangements for DC mains or DC distribution networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries

Definitions

  • This disclosure relates to a shutoff control device.
  • Patent document 1 discloses an airbag ignition circuit that connects a backup capacitor to a power source, ensuring that power is supplied to the squib even if the battery is disconnected.
  • a surge refers to a voltage or current that rises sharply and fluctuates depending on the operating conditions of the power supply or the load connected to the power supply.
  • noise refers to so-called common mode noise, or voltage or current that occurs within a circuit due to the influence of external electromagnetic waves.
  • An interruption control device comprising:
  • This disclosure makes it possible to at least prevent malfunctions caused by noise.
  • An interruption control device comprising:
  • the current sensor, voltage sensor, and magnetic sensor react differently when noise occurs in the conductive path. Therefore, when noise occurs in a conductive path in which at least two of these sensors are provided, the reactions of the respective sensors are different, and the effects of the noise are unlikely to be reflected simultaneously in the detection signals output from the respective sensors.
  • the overcurrent detection unit 12 can detect the overcurrent state based on these detection signals, and the control unit can switch the interruption unit to the interruption state. In this way, it is possible to appropriately control the switching of the interruption unit to the interruption state after eliminating the effects of noise.
  • the conductive path is in an overcurrent state, it means that the state in which the magnitude of the current flowing through the conductive path is an overcurrent continues constantly.
  • the at least two sensors include at least one of the current sensor and the magnetic sensor, and the voltage sensor.
  • the cutoff control device described in (1) includes at least one of the current sensor and the magnetic sensor, and the voltage sensor.
  • the voltage sensor when a voltage surge occurs in the conductive path, the voltage sensor outputs a detection signal reflecting the voltage surge, and the current sensor and magnetic sensor output detection signals that do not reflect the voltage surge. Also, when a current surge occurs in the conductive path, the current sensor and magnetic sensor output detection signals that reflect the current surge, and the voltage sensor outputs a detection signal that does not reflect the current surge. In other words, the effects of the surge are unlikely to be reflected simultaneously in the detection signals output by each sensor. Therefore, with this configuration, malfunctions due to surges occurring in the conductive path can be prevented.
  • the at least two sensors include the current sensor and the magnetic sensor, in the interruption control device described in (1).
  • the current sensor is susceptible to common mode noise and is not easily affected by external electromagnetic waves.
  • the magnetic sensor is not easily affected by common mode noise and is easily affected by external electromagnetic waves. For this reason, by using a current sensor and a magnetic sensor as the two sensors, it is possible to make it difficult for the effects of noise to be reflected in the detection signal at the same time, making it possible to achieve a configuration that suppresses malfunctions caused by noise.
  • Each of the overcurrent detection units includes a comparator to which the detection signal is input, The comparator outputs an overcurrent signal when the detection signal exceeds a threshold value, the control unit has an AND circuit that outputs the indication signal when the overcurrent signals are simultaneously input from all of the comparators;
  • the cutoff control device according to any one of (1) to (3), further comprising a drive circuit that switches the cutoff unit to the cutoff state when the instruction signal is input.
  • control unit is configured to output an instruction signal using an AND circuit, which is a logic circuit, so that the cutoff unit can be switched to the cutoff state more quickly.
  • the cutoff control device can detect an overcurrent state using other sensors that are not failing and switch the cutoff section to the cutoff state.
  • values outside the normal range include values that are greater than the upper limit of the normal range and values that are smaller than the lower limit of the normal range.
  • the in-vehicle system 100 includes a battery 91, a load 70, a conductive path 80, and a cutoff control device 10.
  • the in-vehicle system 100 supplies power based on the battery 91 to the load 70.
  • the battery 91 may be, for example, a lead-acid battery or a lithium-ion battery.
  • the load 70 is an in-vehicle electrical device, and may include electrically-driven components, various ECUs, and ADAS target components.
  • the conductive path 80 has a first conductive path 80A and a second conductive path 80B.
  • the first conductive path 80A is provided between the positive terminal of the battery 91 and the load 70.
  • the second conductive path 80B is provided between the negative terminal of the battery 91 and the load 70.
  • the interruption control device 10 has a first sensor 11A, a second sensor 11B, a signal line 17, an overcurrent detection unit 12, a determination unit 16, a control unit 14, a drive circuit 15, and an interruption unit 13.
  • the first sensor 11A and the second sensor 11B are different in type.
  • the first sensor 11A uses a current sensor having a shunt resistor 11D provided in the second conductive path 80B and a differential amplifier 11E that amplifies the voltage across the shunt resistor 11D and outputs it as a detection signal V1.
  • the second sensor 11B is a voltage sensor that detects the voltage of the second conductive path 80B using two resistors 11F, 11G connected in series, and outputs the divided value of the detected voltage (output voltage) as the detection signal V2.
  • the second sensor 11B may be configured to output the voltage of the second conductive path 80B itself as the detection signal V2.
  • the signal line 17 has a first signal line 17A and a second signal line 17B.
  • the first signal line 17A is connected to the differential amplifier 11E (see FIG. 2), and the detection signal V1 output from the differential amplifier 11E is applied to the first signal line 17A.
  • the second signal line 17B is connected to the connection point with the two resistors 11F, 11G of the second sensor 11B (see FIG. 3), and the detection signal V2 obtained by dividing the voltage of the second conductive path 80B is applied to the second signal line 17B.
  • the signal lines 17 are provided corresponding to each of the first sensor 11A and the second sensor 11B, and the detection signals V1, V2 output from the corresponding first sensor 11A and second sensor 11B are applied to the signal lines 17.
  • the overcurrent detection unit 12 has a first overcurrent detection unit 12A and a second overcurrent detection unit 12B.
  • the first overcurrent detection unit 12A and the second overcurrent detection unit 12B are provided corresponding to the first sensor 11A and the second sensor 11B, respectively.
  • the first overcurrent detection unit 12A and the second overcurrent detection unit 12B have comparators 12C and 12D to which detection signals V1 and V2 are input from the corresponding sensors.
  • the comparator 12C of the first overcurrent detection unit 12A acquires the detection signal V1 detected by the first sensor 11A and compares the acquired detection signal V1 with a first threshold value Th1, which is a threshold value.
  • the first overcurrent detection unit 12A detects that an overcurrent state in which an overcurrent flows through the second conductive path 80B is present.
  • the first overcurrent detection unit 12A detects that the second conductive path 80B is in an overcurrent state, it outputs an overcurrent signal C1.
  • the comparator 12D of the second overcurrent detection unit 12B acquires the detection signal V2 detected by the second sensor 11B and compares the acquired detection signal V2 with a second threshold value Th2, which is a threshold value. Then, when the detection signal V2 falls below the second threshold value Th2, the second overcurrent detection unit 12B detects that an overcurrent state exists in which an overcurrent flows through the second conductive path 80B. When the second overcurrent detection unit 12B detects that the second conductive path 80B is in an overcurrent state, it outputs an overcurrent signal C2. In this way, the overcurrent detection unit 12 detects the overcurrent state of the conductive path 80 based on the detection signals V1 and V2 output from the corresponding sensors.
  • a state in which the first sensor 11A has failed may be when the shunt resistor 11D is open and the resistance value becomes infinite, or when it is shorted and the resistance value becomes so small that it can be considered to be zero.
  • a state in which the second sensor 11B has failed may be when resistors 11F, 11G are open and the resistance value becomes infinite, or when it is shorted and the resistance value becomes so small that it can be considered to be zero.
  • the determination unit 16 determines that the first sensor 11A is faulty.
  • the determination unit 16 then outputs a first fault signal M1 indicating that the first sensor 11A is faulty. Note that outside the normal range includes values greater than the upper limit value (first upper limit Cu1) and less than the lower limit value (first lower limit Cd1) of the normal range.
  • the determination unit 16 determines that the first sensor 11A is not faulty and does not output the first fault signal M1.
  • the determination unit 16 determines that the second sensor 11B is faulty. The determination unit 16 then outputs a second fault signal M2 indicating that the second sensor 11B is faulty. Note that outside the normal range includes values greater than the upper limit (second upper limit Cu2) and less than the lower limit (second lower limit Cd2) of the normal range.
  • the determination unit 16 determines that the second sensor 11B is not faulty and does not output the second fault signal M2.
  • the control unit 14 is configured, for example, by a hardware circuit or an MCU (Micro Controller Unit).
  • the control unit 14 has an AND circuit 14A.
  • the AND circuit 14A is a known logic circuit.
  • the control unit 14 receives both the overcurrent signals C1 and C2 from the first overcurrent detection unit 12A and the second overcurrent detection unit 12B, respectively, and receives the first fault signal M1 and the second fault signal M2 from the determination unit 16.
  • the AND circuit 14A When the first fault signal M1 and the second fault signal M2 are not input from the judgment unit 16, the AND circuit 14A outputs the indication signal Sg1 if both the overcurrent signals C1 and C2 are input from the first overcurrent detection unit 12A and the second overcurrent detection unit 12B at the same time.
  • the AND circuit 14A does not output the indication signal Sg1 if only one of the overcurrent signals C1 and C2 is input from the first overcurrent detection unit 12A and the second overcurrent detection unit 12B (i.e., at different times that are not the same).
  • the AND circuit 14A does not output the indication signal Sg1 if neither the overcurrent signals C1 and C2 are input from the first overcurrent detection unit 12A and the second overcurrent detection unit 12B.
  • the control unit 14 When the first fault signal M1 is input from the judgment unit 16 and the second fault signal M2 is not input, and the overcurrent signal C2 is input from the second overcurrent detection unit 12B to the control unit 14, the control unit 14 outputs the indication signal Sg1. If the overcurrent signal C2 is not input from the second overcurrent detection unit 12B, the control unit 14 does not output the indication signal Sg1. In other words, when the first fault signal M1 is input, the control unit 14 outputs the indication signal Sg1 based on the overcurrent signal C2 from the second overcurrent detection unit 12B.
  • the control unit 14 When the second fault signal M2 is input from the judgment unit 16 and the first fault signal M1 is not input, and the overcurrent signal C1 is input from the first overcurrent detection unit 12A to the control unit 14, the control unit 14 outputs the indication signal Sg1. If the overcurrent signal C1 is not input from the first overcurrent detection unit 12A, the control unit 14 does not output the indication signal Sg1. In other words, when the second fault signal M2 is input, the control unit 14 outputs the indication signal Sg1 based on the overcurrent signal C1 from the first overcurrent detection unit 12A. In other words, the control unit 14 does not use the overcurrent signal based on the sensor judged to be faulty by the judgment unit 16, but uses the overcurrent signal based on the sensor that is not faulty to control the output of the indication signal Sg1.
  • the drive circuit 15 is configured, for example, as a known drive circuit.
  • the drive circuit 15 outputs a drive signal D1 when an instruction signal Sg1 is input from the control unit 14.
  • the interrupter 13 is, for example, a pyrotechnic fuse such as a known pyrofuse (registered trademark).
  • the interrupter 13 is provided, for example, in the second conductive path 80B.
  • the interrupter 13 physically cuts off the second conductive path 80B in response to the input of the drive signal D1 from the drive circuit 15, and switches from a permissive state to a blocked state.
  • the permissive state is a state in which a current is permitted to flow through the second conductive path 80B.
  • the blocked state is a state in which a current is blocked from flowing through the second conductive path 80B. After the interrupter 13 is in the blocked state, it cannot return to the permissive state.
  • the interrupter 13 may be configured to be reversible.
  • the reversible configuration is, for example, a switch.
  • the switch may be a mechanical switch having contacts, or a semiconductor switch such as a MOSFET or IGBT.
  • the conductive path 80 is in an overcurrent state (i.e., a state in which the magnitude of the current in the conductive path 80 is constantly an overcurrent).
  • the first sensor 11A which is a current sensor, detects the current flowing in the conductive path 80 and outputs a detection signal V1 reflecting the overcurrent state to the first signal line 17A.
  • the detection signal V1 exceeds a first threshold value Th1
  • the comparator 12C of the first overcurrent detection unit 12A outputs an overcurrent signal C1.
  • the voltage applied to the conductive path 80 (i.e., the potential difference between the first conductive path 80A and the second conductive path 80B) becomes small.
  • the second sensor 11B which is a voltage sensor, outputs a detection signal V2 reflecting the voltage applied to the conductive path 80 to the second signal line 17B.
  • the comparator 12D of the second overcurrent detection unit 12B outputs an overcurrent signal C2 when the detection signal V2 falls below the second threshold value Th2.
  • Overcurrent signals C1 and C2 are input from all comparators 12C and 12D to the AND circuit 14A of the control unit 14 at the same time.
  • the AND circuit 14A then outputs an instruction signal Sg1.
  • the drive circuit 15 When the instruction signal Sg1 is input, the drive circuit 15 outputs a drive signal D1 to the cutoff unit 13, switching the cutoff unit 13 from a permissive state to a cutoff state.
  • the control unit 14 outputs an instruction signal Sg1 that switches the cutoff unit 13 to the cutoff state.
  • the detection signal V2 falls below the second threshold value Th2, so the overcurrent signal C2 is output. In this way, only the overcurrent signal C2 is input to the control unit 14. Therefore, the AND circuit 14A does not output the instruction signal Sg1, and the drive circuit 15 does not output the drive signal D1.
  • a current surge or common mode noise which causes the current flowing through the conductive path 80 to fluctuate sharply, occurs in the conductive path 80.
  • the first sensor 11A which is a current sensor, outputs a detection signal V1 reflecting the current surge or common mode noise to the first signal line 17A.
  • the voltage applied to the conductive path 80 does not fluctuate. Therefore, even if a current surge or common mode noise occurs in the conductive path 80, the current surge and common mode noise are not reflected in the detection signal V2 output from the second sensor 11B, which is a voltage sensor.
  • the second overcurrent detection unit 12B does not output an overcurrent signal C2 because the detection signal V2 does not fall below the second threshold value Th2.
  • the first overcurrent detection unit 12A outputs an overcurrent signal C1 because the detection signal V1 exceeds the first threshold value Th1.
  • the AND circuit 14A does not output the indication signal Sg1, and therefore the drive signal D1 is not output from the drive circuit 15.
  • the overcurrent signals C1 and C2 are not input to the AND circuit 14A at the same time, and therefore the indication signal Sg1 is not output.
  • step S1 the determination unit 16 determines whether the first sensor 11A is faulty. Specifically, the determination unit 16 determines whether the detection signal V1 output from the first sensor 11A continues to be greater than the first upper limit value Cu1 or smaller than the first lower limit value Cd1 (i.e., outside the normal range) for a predetermined time or longer. In step S1, if the detection signal V1 is equal to or less than the first upper limit value Cu1 and equal to or greater than the first lower limit value Cd1 (i.e., within the normal range), the determination unit 16 determines that the first sensor 11A is not faulty (No in step S1), and the process proceeds to step S5.
  • step S1 the determination unit 16 determines that the detection signal V1 output from the first sensor 11A has remained greater than the first upper limit Cu1 or less than the first lower limit Cd1 (i.e., outside the normal range) for a predetermined time or longer (Yes in step S1). Then, the determination unit 16 outputs a first failure signal M1 indicating that the first sensor 11A is faulty, and proceeds to step S2.
  • the determination unit 16 determines whether the second sensor 11B is broken. Specifically, the determination unit 16 determines whether the detection signal V2 output from the second sensor 11B continues to be greater than the second upper limit Cu2 or smaller than the second lower limit Cd2 for a predetermined time or more (i.e., a state outside the normal range). In step S2, if the detection signal V2 is equal to or less than the second upper limit Cu2 and equal to or greater than the second lower limit Cd2 (i.e., a state within the normal range), the determination unit 16 determines that the second sensor 11B is not broken (No in step S2), and the process proceeds to step S3.
  • step S2 if the determination unit 16 determines that the detection signal V2 continues to be greater than the second upper limit Cu2 or smaller than the second lower limit Cd2 for a predetermined time or more (Yes in step S2), the process in FIG. 4 is terminated.
  • step S3 the control unit 14 determines whether or not the overcurrent signal C2 has been input from the second overcurrent detection unit 12B. If the control unit 14 determines in step S3 that the overcurrent signal C2 has not been input from the second overcurrent detection unit 12B (No in step S3), the process in FIG. 4 ends.
  • step S3 the control unit 14 determines that the overcurrent signal C2 has been input from the second overcurrent detection unit 12B (Yes in step S3). Then, the process proceeds to step S4, where the control unit 14 outputs the instruction signal Sg1 and ends the process in FIG. 4. In this way, when the determination unit 16 determines that the detection signal V1 of the first signal line 17A is outside the normal range and the detection signal V2 of the second signal line 17B is within the normal range, the control unit 14 switches the cutoff unit 13 to the cutoff state based only on the detection signal V2 applied to the second signal line 17B.
  • step S5 the determination unit 16 determines whether the second sensor 11B is faulty. Specifically, the determination unit 16 determines whether the detection signal V2 output from the second sensor 11B continues to be greater than the second upper limit value Cu2 or smaller than the second lower limit value Cd2 (i.e., outside the normal range) for a predetermined time or longer. In step S5, if the detection signal V2 is equal to or less than the second upper limit value Cu2 and equal to or greater than the second lower limit value Cd2 (i.e., within the normal range), the determination unit 16 determines that the second sensor 11B is not faulty (No in step S5), and the process proceeds to step S7.
  • step S5 the determination unit 16 determines that the detection signal V2 output from the second sensor 11B has remained greater than the second upper limit Cu2 or less than the second lower limit Cd2 (i.e., outside the normal range) for a predetermined time or longer (Yes in step S5). Then, the determination unit 16 outputs a second failure signal M2 indicating that the second sensor 11B is malfunctioning, and the process proceeds to step S6.
  • step S6 the control unit 14 determines whether or not the overcurrent signal C1 has been input from the first overcurrent detection unit 12A. If the control unit 14 determines in step S6 that the overcurrent signal C1 has not been input from the first overcurrent detection unit 12A (No in step S6), the process in FIG. 4 ends.
  • step S6 the control unit 14 determines that the overcurrent signal C1 has been input from the first overcurrent detection unit 12A (Yes in step S6). Then, the process proceeds to step S4, where the control unit 14 outputs the instruction signal Sg1 and ends the process in FIG. 4. In this way, when the determination unit 16 determines that the detection signal V2 of the second signal line 17B is outside the normal range and the detection signal V1 of the first signal line 17A is within the normal range, the control unit 14 switches the cutoff unit 13 to the cutoff state based only on the detection signal V1 applied to the first signal line 17A.
  • step S7 the control unit 14 determines whether or not the overcurrent signal C1 has been input from the first overcurrent detection unit 12A and the overcurrent signal C2 has been input from the second overcurrent detection unit 12B. If the control unit 14 determines in step S7 that the overcurrent signal C1 has not been input from the first overcurrent detection unit 12A or the overcurrent signal C2 has not been input from the second overcurrent detection unit 12B (No in step S7), the process in FIG. 4 ends.
  • step S7 the control unit 14 determines that the overcurrent signal C1 has been input from the first overcurrent detection unit 12A and that the overcurrent signal C2 has been input from the second overcurrent detection unit 12B (Yes in step S7). Then, the process proceeds to step S4, where the control unit 14 outputs the instruction signal Sg1 and ends the process in FIG. 4.
  • the interruption control device 10 includes a first sensor 11A and a second sensor 11B, an overcurrent detection unit 12, an interruption unit 13, and a control unit 14.
  • the first sensor 11A is a current sensor having a shunt resistor 11D provided in the conductive path 80 and a differential amplifier 11E that amplifies the voltage across the shunt resistor 11D.
  • the second sensor 11B is a voltage sensor that detects the voltage of the conductive path 80.
  • the overcurrent detection units 12 are provided corresponding to each of the two sensors, and detect an overcurrent state of the conductive path 80 based on detection signals V1 and V2 output from the corresponding sensors.
  • the interruption unit 13 switches from a permissive state that allows a current to flow through the conductive path 80 to a cutoff state that cuts off the current.
  • the control unit 14 outputs an instruction signal Sg1 that switches the cutoff unit 13 to the cutoff state when a plurality of overcurrent detection units 12 detect an overcurrent state at the same time.
  • the first sensor 11A and the second sensor 11B react differently when a surge or common mode noise occurs in the conductive path 80. Therefore, when a surge or common mode noise occurs in the conductive path 80 on which the first sensor 11A and the second sensor 11B are provided, the reactions of the respective sensors are different, so that the effects of the surge and common mode noise are unlikely to be reflected simultaneously in the detection signals V1 and V2 output from the respective sensors. In contrast, when the conductive path 80 is in an overcurrent state, the effects of the overcurrent state are reflected simultaneously in the detection signals V1 and V2, and the overcurrent detection unit 12 detects the overcurrent state based on these detection signals V1 and V2, and the control unit 14 can switch the cutoff unit 13 to the cutoff state.
  • the conductive path 80 being in an overcurrent state means that the state in which the magnitude of the current flowing through the conductive path 80 is an overcurrent continues constantly.
  • the two sensors include a first sensor 11A which is a current sensor and a second sensor 11B which is a voltage sensor.
  • the second sensor 11B outputs a detection signal V2 which reflects the voltage surge
  • the first sensor 11A outputs a detection signal V1 which does not reflect the voltage surge.
  • the first sensor 11A outputs a detection signal V1 which reflects the current surge or common mode noise
  • the second sensor 11B outputs a detection signal V2 which does not reflect the current surge or common mode noise.
  • the detection signals V1 and V2 output from each sensor are unlikely to reflect the effects of the surge and common mode noise at the same time. Therefore, with this configuration, malfunctions due to surges and common mode noise occurring in the conductive path 80 can be prevented.
  • Each overcurrent detection unit 12 has comparators 12C and 12D to which detection signals V1 and V2 are input.
  • Comparator 12C outputs an overcurrent signal C1 when detection signal V1 exceeds a first threshold value Th1.
  • Comparator 12D outputs an overcurrent signal C2 when detection signal V2 falls below a second threshold value Th2.
  • Control unit 14 has an AND circuit 14A that outputs an indication signal Sg1 when overcurrent signals C1 and C2 are input from all comparators 12C and 12D at the same time. Furthermore, it has a drive circuit 15 that switches cutoff unit 13 to the cutoff state when indication signal Sg1 is input.
  • Control unit 14 is configured to output indication signal Sg1 using AND circuit 14A, which is a logic circuit, so that cutoff unit 13 can be switched to the cutoff state earlier.
  • the cutoff control device 10 includes a signal line 17 and a determination unit 16.
  • the signal line 17 is provided corresponding to each of the first sensor 11A and the second sensor 11B, and the detection signals V1 and V2 output from the corresponding sensor are applied to the signal line 17.
  • the determination unit 16 determines whether the detection signals V1 and V2 applied to each signal line 17 are within the normal range.
  • the control unit 14 switches the cutoff unit 13 to the cutoff state based only on the detection signals V2 (V1) applied to the other signal lines 17. With this configuration, even if some sensors fail, the other sensors that are not failing can detect the overcurrent state and switch the cutoff unit 13 to the cutoff state.
  • control unit and the determination unit may be configured as a single microcomputer.
  • a magnetic sensor may be provided in the conductive path in addition to the current sensor and the voltage sensor.
  • the control unit may output an instruction signal when overcurrent signals are input from these sensors at the same time.
  • the third sensor 11H which is a magnetic sensor, is provided in a non-contact manner with respect to the second conductive path 80B, is disposed near the second conductive path 80B, and is a known Hall element that detects a magnetic field generated by a current flowing through the second conductive path 80B.
  • the third sensor 11H outputs a detection signal V3 to a third signal line 17C, which is a part of the signal line 17, and further includes a third overcurrent detection unit 12E, which is an overcurrent detection unit 12 to which the detection signal V3 is input.
  • the third overcurrent detection unit 12E has a comparator 12F. When the detection signal V3 exceeds a third threshold value Th3, which is a threshold value, the comparator 12F outputs an overcurrent signal C3 to an AND circuit of the control unit. When overcurrent signals are input from all sensors to the AND circuit, an indication signal is output from the AND circuit.
  • a configuration may be used in which a third sensor 11H (magnetic sensor) shown in FIG. 5 is used instead of a current sensor.
  • a configuration may be used that includes two sensors, the third sensor 11H being a magnetic sensor, and the second sensor 11B being a voltage sensor.
  • the third sensor 11H (magnetic sensor) shown in FIG. 5 may be used instead of the voltage sensor.
  • the two sensors may include the first sensor 11A, which is a current sensor, and the third sensor 11H, which is a magnetic sensor.
  • the first sensor 11A (current sensor) is susceptible to common mode noise and is not easily affected by electromagnetic noise.
  • the third sensor 11H (magnetic sensor) is not easily affected by common mode noise and is susceptible to electromagnetic noise. Therefore, by using the first sensor 11A (current sensor) and the third sensor 11H (magnetic sensor), it is possible to suppress malfunctions caused by noise by making it difficult for the influence of noise to be reflected simultaneously in the detection signals V1 and V3.
  • the determination unit is configured to output a first fault signal when it determines that the first sensor 11A is faulty, and to output a third fault signal when it determines that the third sensor 11H is faulty.
  • the control unit does not use the overcurrent signal based on the sensor that is determined to be faulty by the determination unit, but instead uses the overcurrent signal based on the sensor that is not faulty to control the output of the instruction signal.
  • An operational amplifier may be used as the first overcurrent detection unit and the second overcurrent detection unit.
  • the interrupter may be provided in the first conductive path.
  • the first sensor and the second sensor may be provided in the first conductive path.

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  • Power Engineering (AREA)
  • Emergency Protection Circuit Devices (AREA)
PCT/JP2023/020221 2023-05-31 2023-05-31 遮断制御装置 Ceased WO2024247153A1 (ja)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020145029A1 (ja) * 2019-01-09 2020-07-16 株式会社デンソー 通電制御装置
WO2022259764A1 (ja) * 2021-06-11 2022-12-15 パナソニックＩｐマネジメント株式会社 車載用遮断装置および遮断方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020145029A1 (ja) * 2019-01-09 2020-07-16 株式会社デンソー 通電制御装置
WO2022259764A1 (ja) * 2021-06-11 2022-12-15 パナソニックＩｐマネジメント株式会社 車載用遮断装置および遮断方法

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