WO2020137507A1 - Dispositif de commande de conduction et système d'alimentation électrique - Google Patents

Dispositif de commande de conduction et système d'alimentation électrique Download PDF

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Publication number
WO2020137507A1
WO2020137507A1 PCT/JP2019/048219 JP2019048219W WO2020137507A1 WO 2020137507 A1 WO2020137507 A1 WO 2020137507A1 JP 2019048219 W JP2019048219 W JP 2019048219W WO 2020137507 A1 WO2020137507 A1 WO 2020137507A1
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WIPO (PCT)
Prior art keywords
switch
energization control
control device
power supply
terminal
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Application number
PCT/JP2019/048219
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English (en)
Japanese (ja)
Inventor
祐介 増元
沼崎　浩二
幸幹 松下
竜乃介 力田
淳平 ▲高▼石
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株式会社デンソー
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Publication of WO2020137507A1 publication Critical patent/WO2020137507A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
    • 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
    • H02H3/16—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 fault current to earth, frame or mass
    • 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

Definitions

  • the present disclosure relates to an energization control device and a power supply system.
  • Patent Document 1 discloses an energization control device.
  • the energization control device connects a terminal to which the first power storage device is connected (hereinafter referred to as a first terminal), a terminal to which a second power storage device is connected (hereinafter referred to as a second terminal), and a load.
  • the terminal hereinafter, referred to as a third terminal
  • the energization control device includes a switch provided on a main current path connecting the first terminal and the third terminal, and a switch provided on a main current path connecting the third terminal and the second terminal. The switch switches conduction and interruption between terminals.
  • a ground fault information detection unit is further provided to detect a ground fault on the power storage device side.
  • the ground fault information detection unit includes a switch different from the switch provided on the main path.
  • the configuration of the related art cannot detect an abnormality that has occurred on the load side, such as a ground fault.
  • One of the disclosed purposes is to provide an energization control device that can be shut off even when an abnormality occurs outside the terminal.
  • the energization control device includes 3 or more terminals connected to the outside, A switch that is provided in the main path of the current that connects different terminals and that switches between conduction and interruption between the terminals, A determination unit that detects a current flowing through each of the plurality of switches and determines whether or not an overcurrent accompanying an abnormality is flowing, When the current flowing through at least some of the switches is an overcurrent, a control unit that switches the switch connected to the terminal closest to the abnormal site to the off state, based on the direction in which the overcurrent flows, Equipped with.
  • the determination unit can determine the overcurrent.
  • the control unit turns off the switch connected to the terminal closest to the abnormal portion based on the direction in which the overcurrent flows. As a result, even if an abnormality occurs outside any of the terminals, it can be shut off.
  • FIG. 1 It is a figure which shows schematic structure of the power supply system provided with the electricity supply control apparatus which concerns on 1st Embodiment. It is a figure which shows an electricity supply control apparatus. It is a flow chart which shows the processing which a controller performs. It is a timing chart. It is a figure which shows a modification. It is a figure which shows a modification. It is a figure which shows a modification. It is a figure which shows a modification. It is a figure which shows a modification. It is a figure which shows a modification. It is a figure which shows a modification. It is a figure which shows a modification. It is a figure which shows a modification. It is a figure which shows a modification. It is a figure which shows a modification. It is a figure which shows a modification. It is a figure which shows a modification. It is a figure which shows a modification. It is a figure which shows a modification. It is a figure which shows a modification. It is a figure which
  • the energization control device of this embodiment is applied to a power supply system.
  • a power supply system an example of a redundant power supply system mounted in a vehicle will be shown as a power supply system.
  • conduction means a state of being electrically connected.
  • Electric means a state in which a current is flowing.
  • the power supply system 10 includes power supplies 11 and 12 and an energization control device 13.
  • the power supply system 10 supplies electric power to various devices mounted on the vehicle.
  • the power supplies 11 and 12 are DC voltage sources that can be charged and discharged.
  • a secondary battery such as a lead storage battery, a nickel hydrogen battery, a lithium ion battery, or a capacitor can be used.
  • the power supply 11 of this embodiment is a lead storage battery.
  • the power source 12 is a lithium ion battery.
  • the rated voltage of the power supplies 11 and 12 is, for example, 12V.
  • a bus 14a is connected to the positive electrode of the power supply 11.
  • the bus 14b is connected to the positive electrode of the power supply 12.
  • the buses 14a and 14b are also referred to as energization lines and power supply lines.
  • the bus 14a is a bus of the first power system
  • the bus 14b is a bus of the second power system.
  • the energization control device 13 is arranged between the buses 14a and 14b. The energization control device 13 controls the electrical connection state of the buses 14a and 14b.
  • a generator 15 and loads 16a and 17 are connected to the bus 14a.
  • a load 16b is connected to the bus 14b.
  • the generator 15 and the loads 16a and 17 are connected in parallel to the power supply 11.
  • the load 16b is connected to the power supply 12 in parallel.
  • the power supplies 11 and 12, the generator 15, and the loads 16a, 16b, and 17 are connected in parallel in a state where the buses 14a and 14b are electrically connected.
  • the electric power generated by the generator 15 can be supplied to the power sources 11 and 12 and the loads 16a, 16b, and 17. Further, power can be supplied to the loads 16a, 16b, and 17 from at least one of the power supplies 11 and 12.
  • the generator 15 is, for example, an alternator or an ISG.
  • the generator 15 is a supply source of DC power to the power supplies 11 and 12 and the loads 16a, 16b, and 17.
  • the power source 11 and the generator 15 correspond to the first power source
  • the power source 12 corresponds to the second power source.
  • the DCDC converter can be regarded as the above-mentioned supply source.
  • the DCDC converter converts a DC voltage supplied from a high voltage battery (not shown) (for example, 48V battery) into a low voltage that can be supplied to the power supplies 11 and 12, and outputs the low voltage.
  • the DCDC converter connected to the bus 14a is provided, the DCDC converter also corresponds to the first power supply.
  • the loads 16a and 16b are redundant devices that must continue to operate when the power fails in the interest of vehicle safety.
  • the loads 16a and 16b are loads that are not allowed to fail in power supply.
  • the loads 16a and 16b are FOP (Fail Operational) target loads.
  • the loads 16a and 16b are loads that require stable voltage supply.
  • the stable voltage is a voltage within the operation guarantee voltage range for continuing the desired operation.
  • the loads 16a and 16b are redundantly provided in one component, such as a redundant electric power steering device.
  • the motor that assists the steering force includes, for example, two windings.
  • the loads 16a and 16b may be a combination in which equivalent functions are realized by devices of different types.
  • the camera may be the load 16a and the LIDAR may be the load 16b.
  • the loads 16a and 16b are redundantly provided for the power supply system 10. As described above, the load 16a is connected to the bus 14a on the power supply 11 side, and the load 16b is connected to the bus 14b on the power supply 12 side.
  • the energization control device 13 is arranged between the loads 16a and 16b.
  • the load 17 is a general load, and the load 17 is an FOP non-target load (Non-FOP).
  • the load 17 is a device that has a small influence on the safety of the vehicle even if the operation is stopped at worst in the event of a power failure.
  • the load 17 is a load that allows power failure. Examples of the load 17 include a motor used for a power window and a motor used for a radiator fan.
  • the load connected to the bus 14a is not limited to the two loads 16a and 17. Other general loads and redundant loads may be connected.
  • the load connected to the bus 14b is not limited to the load 16b. Other general loads and redundant loads may be connected. In the case of a redundant load, one may be provided on the bus 14a side and the other may be provided on the bus 14b side.
  • the energization control device 13 will be described with reference to FIGS. 1 and 2.
  • the energization control device 13 includes a first terminal 21 and a second terminal 22 which are terminals for external connection, a plurality of switches SW, and a controller 50.
  • the 1st terminal 21 and the 2nd terminal 22 may be called terminals 21 and 22.
  • the first terminal 21 is connected to the bus 14a on the first power supply side (power supply 11 side).
  • the second terminal 22 is connected to the bus 14b on the second power source side (power source 12 side).
  • the plurality of switches SW are provided in parallel between the terminals 21 and 22.
  • the switch SW is provided on each of the plurality of paths 30.
  • the switch SW includes two switches SW1 and SW2, and the route 30 includes two routes 31 and 32.
  • the paths 31 and 32 are provided in parallel between the terminals 21 and 22.
  • the switch SW1 is provided on the path 31, and the switch SW2 is provided on the path 32.
  • the switch SW switches between conduction and interruption between the terminals 21 and 22.
  • the switch SW switches the corresponding path 30 to the conductive state or the cutoff state.
  • Each of the switches SW is composed of two MOSFETs 40.
  • the switch SW1 is composed of n-channel type MOSFETs 41a and 41b connected in series.
  • the MOSFETs 41a and 41b are normally-off type semiconductor elements.
  • the MOSFETs 41a and 41b are arranged such that the parasitic diodes are in opposite directions.
  • the anodes of the parasitic diodes are connected to each other.
  • the MOSFETs 41a and 41b have a source common type connection form in which sources are connected to each other.
  • the drain of the MOSFET 41a is electrically connected to the first terminal 21, and the drain of the MOSFET 41b is electrically connected to the second terminal 22.
  • the switch SW2 has the same configuration as the switch SW1.
  • the switch SW2 includes n-channel MOSFETs 42a and 42b connected in series.
  • the MOSFETs 42a and 42b are arranged such that the parasitic diodes are opposite to each other.
  • the anodes of the parasitic diodes are connected to each other.
  • the MOSFETs 42a and 42b have a source common type connection structure.
  • the configuration of the switches SW is not limited to the above example.
  • a drain common connection mode in which the drains are connected to each other may be adopted.
  • the parasitic diodes are opposite to each other.
  • the cathodes of the parasitic diodes are connected to each other.
  • one switch SW can be composed of one semiconductor element.
  • the controller 50 controls driving of the plurality of switches SW.
  • the controller 50 controls the driving of each MOSFET 40.
  • the controller 50 determines whether the switch SW has an ON failure.
  • the controller 50 is also called an electronic control unit (ECU). Electric power is supplied to the controller 50 through, for example, the terminals 21 and 22, and the controller 50 operates.
  • the controller 50 is provided by a control system including at least one computer.
  • the control system includes at least one processor (hardware processor) that is hardware.
  • the hardware processor can be provided by (i), (ii), or (iii) below.
  • the hardware processor may be a hardware logic circuit.
  • the computer is provided by a digital circuit including a large number of programmed logic units (gate circuits).
  • the digital circuit may include a memory that stores programs and/or data.
  • the computer may be provided by analog circuitry.
  • the computer may be provided by a combination of digital circuits and analog circuits.
  • the hardware processor may be at least one processor core that executes a program stored in at least one memory.
  • the computer is provided with at least one memory and at least one processor core.
  • the processor core is called, for example, a CPU.
  • the memory is also called a storage medium.
  • a memory is a non-transitional and tangible storage medium that stores "programs and/or data" readable by a processor in a non-transitory manner.
  • the (iii) hardware processor may be a combination of the above (i) and the above (ii).
  • (I) and (ii) are arranged on different chips or on a common chip.
  • the means and/or functions provided by the controller 50 can be provided by hardware only, software only, or a combination thereof. In this embodiment, it is realized by using an ASIC.
  • the controller 5 is connected to the ECU 5 provided outside the energization control device 13.
  • the controller 50 and the ECU 5 can communicate with each other via a bus of an in-vehicle network.
  • the controller 50 determines the control state of the switch SW based on a command value from the ECU 5, which is a higher-level control device, the power storage states of the power supplies 11 and 12, and generates a drive signal for the switch SW. Then, the generated drive signal is output to the gate of the corresponding switch SW.
  • the buses 14a and 14b are provided with voltage sensors for detecting the battery voltages of the power supplies 11 and 12, respectively.
  • the controller 50 calculates, for example, the SOC of the power supply 12, and controls the charge amount and the discharge amount of the power supply 12 so that the SOC is maintained within a predetermined usage range.
  • the controller 50 determines whether or not the ON failure has occurred in the switches SW1 and SW2. In this embodiment, the ON failure is determined based on the change in the current flowing through the switch SW.
  • a shunt resistor 60 is provided in the path 30 in series with the switch SW in order to detect the current flowing through the switch SW.
  • the position of the shunt resistor 60 is not particularly limited.
  • the shunt resistor 60 is provided between the MOSFETs 41a and 41b.
  • the shunt resistor 60 may be provided closer to the first terminal 21 side than the MOSFET 41a or may be closer to the second terminal 22 side than the MOSFET 41b. The same applies to the shunt resistor 60 on the path 32.
  • the controller 50 detects the voltage across the shunt resistor 60 as a correlation value of the current flowing through the switch SW. The controller 50 determines, based on the voltage across the shunt resistor 60, whether or not a current is flowing through the switch SW, in other words, whether or not a current is flowing between the terminals 21 and 22. The controller 50 determines whether or not an ON failure has occurred, based on the change in the voltage across the terminal that correlates with the change in current.
  • the controller 50 is configured to be able to detect both the current flowing from the first terminal 21 to the second terminal 22 and the current flowing from the second terminal 22 to the first terminal 21.
  • the controller 50 can detect bidirectional current. Therefore, it is possible to determine the presence/absence of an ON failure with respect to the current in any direction.
  • the processing executed by the controller 50 will be described with reference to FIG.
  • the controller 50 executes the failure determination process of the switches SW1 and SW2 during the energization period in which the current flows between the terminals 21 and 22.
  • the energization period is a period during which electric power is transferred between different electric power systems, that is, between the buses 14a and 14b. For example, it is a period in which the electric power generated by the generator 15 is supplied to the bus 14b side. This is a period in which power is supplied from the power supply 11 to the bus 14b side. This is a period in which power is supplied from the power supply 12 to the bus 14a.
  • the controller 50 normally controls all the switches SW to be in the ON state during the energization period.
  • the failure determination process is temporarily executed during the energization period.
  • the failure determination process may be executed, for example, every energization period.
  • the process may be performed again in the first energization period after the lapse of a predetermined time. That is, it may be repeatedly executed periodically. It may be executed in the first energization period after a predetermined event occurs. Events include, for example, turning on an ignition switch, parking and stopping, and switching of driving modes.
  • the current flowing between the terminals 21 and 22 is shown as I12
  • the current flowing through the path 31 is shown as I12a
  • the current flowing through the path 32 is shown as I12b
  • the voltage between the terminals 21 and 22 is shown as V12.
  • the controller 50 first performs a failure determination process for the switch SW1.
  • the controller 50 stores the value of the current flowing through the switch SW1 (step S10). This current value is a current value before turning off the switch SW1.
  • the controller 50 switches the switch SW1 from the on state to the off state (step S11), and after switching, stores the value of the current flowing through the switch SW1 (step S12).
  • This current value is the current value after the switch SW1 is turned off.
  • the controller 50 determines whether or not the current value has changed before and after the switch SW1 is switched (step S13). The controller 50 determines whether or not there is a change in the current value before and after switching based on the current value stored in steps S10 and S12. The change in the current value is judged with a predetermined margin.
  • the current flows through the parasitic diode of the MOSFET that cannot cut off the current.
  • a current flows from the MOSFET 41a to the MOSFET 41b and an ON failure occurs in the MOSFET 41a
  • a current flows through the parasitic diode of the MOSFET 41b. Therefore, the path 31 is not cut off, and the current Ia1 flowing through the path 31 hardly changes.
  • the MOSFETs 41a and 41b are both turned off and the path 31 is turned off.
  • the resistance value of the switch SW1 is ideally infinite and higher than that in the ON state. As a result, no current flows in the path 31, and the current in the path 31 is reduced by switching. Therefore, it is possible to determine whether or not the ON failure has occurred based on the change in the current value before and after the switching.
  • step S13 When it is determined in step S13 that the current value has changed, that is, the ON failure has not occurred, the controller 50 returns the switch SW1 to the ON state (step S14) and performs the failure determination process of the switch SW2.
  • the controller 50 stores the value of the current flowing through the switch SW2 (step S15). This current value is a current value before turning off the switch SW2.
  • the controller 50 switches the switch SW2 from the on state to the off state (step S16), and after switching, stores the value of the current flowing through the switch SW2 (step S17).
  • This current value is the current value after the switch SW2 is turned off.
  • the controller 50 determines whether or not the current value has changed before and after the switch SW2 is switched (step S18). The controller 50 determines, based on the current value stored in steps S15 and S17, whether or not the current value has changed before and after the switching. The change in the current value is judged with a predetermined margin.
  • the current flows through the parasitic diode of the MOSFET that cannot cut off the current.
  • a current flows through the parasitic diode of the MOSFET 42b. Therefore, the path 32 is not cut off, and the current Ia2 flowing through the path 32 hardly changes.
  • the MOSFETs 42a and 42b are both turned off and the path 32 is turned off.
  • the resistance value of the switch SW2 is ideally infinite and higher than that in the ON state. As a result, no current flows in the path 32, and the current in the path 32 is reduced by switching. Therefore, it is possible to determine whether or not the ON failure has occurred based on the change in the current value before and after the switching.
  • step S18 When it is determined in step S18 that the current value has changed, that is, the ON failure has not occurred, the controller 50 returns the switch SW2 to the ON state (step S19) and ends the series of processes.
  • step S13 or step S18 When it is determined in step S13 or step S18 that the current value has not changed, that is, the ON failure has occurred, the controller 50 executes the ON failure processing (step S20) and ends the series of processing.
  • the on-failure processing includes outputting a diagnostic signal to the ECU 5 and shifting to a control in which the switch SW on the path 30 opposite to the switch SW in the on-failure is always turned on. By constantly turning on the switch SW that has not failed, heat generation of the switch SW that has failed can be suppressed.
  • FIG. 3 shows an example in which the failure determination process of the switch SW1 is performed first, the failure determination process of the switch SW2 may be performed first.
  • FIG. 4 is a timing chart of the drive signal of the switch SW, the currents I12, I12a, I12b, and the voltage V12.
  • the currents I12, I12a, and I12b are indicated by alternate long and two short dashes lines.
  • FIG. 1 shows an example in which a current flows from the bus 14a to the bus 14b.
  • the controller 50 switches the drive signal of the MOSFETs 41a and 41b forming the switch SW1 from the H level (ON signal) to the L level (OFF signal). As a result, the MOSFETs 41a and 41b are turned off. The off state is maintained until time t2. During this time, the drive signals of the MOSFETs 42a and 42b forming the switch SW2 are held at the H level.
  • the controller 50 switches the drive signals of the MOSFETs 42a and 42b forming the switch SW2 from H level to L level at time t3. As a result, the MOSFETs 42a and 42b are turned off. The off state is maintained until time t4. During this period, the drive signals of the MOSFETs 41a and 41b forming the switch SW1 are held at the H level.
  • Times t5 to t6 are the same as times t1 to t2.
  • the controller 50 switches the drive signals of the MOSFETs 42a and 42b to the L level from time t7 to time t8.
  • the drive signals of the MOSFETs 41a and 41b are held at H level.
  • the switch SW2 From time t7 to t8, the switch SW2 has an ON failure. Therefore, the path 32 is not cut off, and the current I12b hardly changes. Therefore, it can be determined that the ON failure has occurred. Since the current I12b hardly changes, the current I12a and the voltage V12 also hardly change.
  • the current I12b on the switch SW2 side also changes before and after the switching of the drive signal of the switch SW1.
  • the current I12b hardly changes. Therefore, the ON failure of the switch SW1 can be detected based on the change in the current flowing through the switch SW2.
  • the switch SW2 has no on-failure
  • the current I12a on the switch SW1 side also changes before and after the switching of the drive signal of the switch SW2, as described above.
  • the ON failure occurs, the current I12a also hardly changes. Therefore, the ON failure of the switch SW2 can be detected based on the change in the current flowing through the switch SW1.
  • the controller 50 temporarily switches to the failure detection control during the energization period in which the current flows between the first terminal 21 and the second terminal 22.
  • the ON state of the first switch which is a part of the plurality of switches SW, is held. Thereby, the energized state between the first terminal 21 and the second terminal 22 can be maintained. Therefore, the ON failure determination can be performed during the energization period.
  • the remaining second switches are controlled so that their resistance values are high.
  • the resistance value of the second switch in which the on failure has not occurred is ideally infinite.
  • the resistance value of the second switch is different before and during the execution of the failure detection control. Therefore, it is possible to determine whether or not the ON failure has occurred in the second switch from the change in the physical quantity (current value) associated with the change in the resistance value of the second switch.
  • the switch SW that holds the ON signal as the drive signal at the time of the ON failure determination corresponds to the first switch
  • the switch SW that receives the OFF signal as the drive signal corresponds to the second switch.
  • the switch SW1 corresponds to the second switch and the switch SW2 corresponds to the first switch.
  • the switch SW1 corresponds to the first switch and the switch SW2 corresponds to the second switch.
  • a first power supply and a second power supply are provided for the loads 16a and 16b. That is, the power supplies are redundantly provided. Electric power must be stably supplied to at least one of the loads 16a and 16b.
  • the energization control device 13 of the present embodiment it is possible to confirm the ON failure of the switch SW while maintaining the energization state between the terminals 21 and 22 during the energization period. Accordingly, even if an abnormality such as a battery failure, a bus ground fault, a load ground fault, or a motor lock actually occurs on one side of the buses 14a and 14b, the buses 14a and 14b can be reliably disconnected from each other.
  • the bus 14a corresponds to the line on the first power supply side
  • the bus 14b corresponds to the line on the second power supply side.
  • the controller 50 does not turn off all the switches SW provided in parallel between the terminals 21 and 22 at the same time, but turns them off sequentially with a time difference. In this way, the switches SW to be turned off are sequentially switched. Accordingly, it is possible to confirm the ON failure of all the switches SW during the energization period while maintaining the energized state.
  • the plurality of switches SW may be turned off at the same time at least once among the plurality of times of switching. For example, when there are three switches SW, two switches SW may be turned off at the same time, and then the remaining switches SW may be turned off. By sequentially switching the switches one by one, it is possible to identify the switch SW in which the ON failure has occurred. Further, it is not necessary to turn off all the switches SW during one energization period. All the switches SW may be turned off sequentially over a plurality of energization periods.
  • the controller 50 may shut off between the buses 14a and 14b according to an instruction from the host ECU 5 when the above-mentioned abnormality occurs on one side of the buses 14a and 14b. Further, for example, the above-described current detection function may be used to disconnect between the buses 14a and 14b when it is detected that an overcurrent due to an abnormality is flowing.
  • the physical quantity that changes with the change in the resistance value of the switch SW is not limited to the current value.
  • the controller 50 may detect the voltage between the terminals 21 and 22.
  • the voltage (V12) between the terminals 21 and 22 changes before and after the switching of the drive signal of the switch SW1 when, for example, the ON failure has not occurred in the switch SW1, and almost always occurs when the ON failure occurs. It does not change. Therefore, the ON failure of the switch SW1 can also be detected.
  • the ON failure of the switch SW2 can be detected based on the change in the voltage between the terminals 21 and 22.
  • the ON voltage of each of the switches SW1 and SW2 may be detected as the voltage between the terminals 21 and 22. Furthermore, at least one ON voltage of the semiconductor elements connected in series may be detected.
  • the ON voltage is a voltage (Vds) between the drain and the source in the MOSFET.
  • the switch SW may be controlled to a half-on state.
  • Half-on is a state in which the current is substantially on and current flows, but the on-resistance is larger than that in full-on.
  • the drive signal gate voltage
  • the half-on state is achieved.
  • the voltage V12 between the terminals 21 and 22 changes before and after the switching.
  • the half-on causes the resistance value to be larger than that in the on-state, so that the voltage V12 increases.
  • the switch SW2 has an ON failure. Due to the ON failure, the resistance value of the switch SW2 decreases, and the voltage V12 hardly changes or the change from the ON state becomes small. In this way, the presence/absence of an ON failure can be determined based on the change in the voltage V12.
  • the half-on state can also be realized by dividing the cell region of the semiconductor element formed on the semiconductor chip 70 into a region connected to the gate wiring 71a and a region connected to the gate wiring 71b, as shown in FIG. Is.
  • a MOSFET 41a is formed on the semiconductor chip 70.
  • the source region 70s is provided on the surface layer on one surface side
  • the drain region 70d is provided on the surface layer on the back surface side opposite to the one surface.
  • the semiconductor chip 70 is provided with a gate electrode 70g having a trench structure extending from one surface to the back surface.
  • a plurality of gate electrodes 70g are arranged in parallel in one direction orthogonal to the plate thickness direction.
  • the source region 70s is adjacent to the gate electrode 70g via the gate insulating film.
  • the gate electrode 71g1 of the gate electrode 70g is electrically connected to the gate wiring 71a.
  • the remaining gate electrode 71g2 is electrically connected to the gate wiring 71b.
  • the cell region having the gate electrode 71g1 and the cell region having the gate electrode 71g2 are provided such that the area ratios thereof are predetermined, for example, substantially equal.
  • the controller 50 outputs an ON signal as a drive signal to the gate wiring 71a and an OFF signal as a drive signal to the gate wiring 71b.
  • an ON-state cell and an OFF-state cell are formed inside the MOSFET 41a, and the half-ON state is established. It is easier to obtain a desired resistance value as compared with the case where the gate voltage is lowered to enter the half-on state.
  • the arrangement of the cell region having the gate electrode 71g1 and the cell region having the gate electrode 71g2 is not limited to the example shown in FIG. For example, they may be provided alternately in the above-mentioned one direction.
  • FIG. 9 and 10 show specific examples of the parallel circuit provided between the terminals 21 and 22.
  • all the semiconductor elements forming the switch SW are individually provided.
  • the MOSFETs 41a, 41b, 42a, 42b are formed on different semiconductor chips 70.
  • one semiconductor package 72 includes one semiconductor chip 70.
  • the parallel circuit may be composed of different semiconductor chips 70 and different semiconductor packages 72.
  • the MOSFETs 41a and 42a are configured by one semiconductor package 72, and the MOSFETs 41b and 42b are configured by another semiconductor package 72.
  • the parallel circuit may be configured by one semiconductor package 72.
  • one semiconductor package 72 includes two semiconductor chips 70.
  • the MOSFETs 41a and 42a are configured in one semiconductor chip 70, and the MOSFETs 41b and 42b are configured in another semiconductor chip 70.
  • the two semiconductor packages 72 each include the semiconductor chip 70.
  • the parallel circuit may be configured by one semiconductor chip 70.
  • a plurality of semiconductor elements may be provided on one semiconductor chip 70. That is, other channels may be used.
  • a drain common connection mode is formed in which the drains of the MOSFETs 41a and 42a provided on the same semiconductor chip 70 are electrically connected to each other. The same applies to the MOSFETs 41b and 42b.
  • the sources of the MOSFETs 41a and 42a provided in the same semiconductor chip 70 are electrically connected to each other as compared with FIG. The same applies to the MOSFETs 41b and 42b.
  • the gate wiring is individually provided. That is, two semiconductor elements formed on one semiconductor element are individually controllable. In this case as well, by sequentially turning off, it is possible to determine whether or not there is an on failure while maintaining the energized state.
  • one semiconductor package 72 may include semiconductor elements connected in series.
  • the semiconductor elements connected in series may be provided in one semiconductor chip 70.
  • All the semiconductor elements that form the parallel circuit may be provided in one semiconductor package 72.
  • All the semiconductor elements forming the parallel circuit may be provided in one semiconductor chip 70.
  • the four MOSFETs 41a, 41b, 42a, 42b described above may be provided in one semiconductor chip 70.
  • the gate wiring may be divided into the MOSFETs 41a and 41b of the path 31 and the MOSFETs 42a and 42b of the path 32.
  • the structure of the power supply system 10 to which the energization control device 13 according to the present embodiment is applied is not limited to the above example.
  • the second power system is simply added to the first power system via the energization control device 13.
  • the power supply system 10 shown in FIGS. 11 and 12 is a backbone type system in which three or more power systems are connected in series via the energization control device 13.
  • terminals for example, terminals 21 and 22
  • the power supply system 10 shown in FIG. 11A includes, as the energization control device 13, three energization control devices 13a to 13c arranged in series. Each of the energization control devices 13a to 13c has two terminals.
  • a bus 14a is connected to one of the two terminals of the energization control device 13a.
  • the power supply 11 and the generator 15 are connected to the bus 14a.
  • the bus 14c is connected to the other one of the terminals. Loads 16a and 17 are connected to the bus 14c.
  • the bus 14a corresponds to the line on the first power supply side
  • the bus 14c corresponds to the line on the second power supply side.
  • the bus 14c described above is connected to one of the two terminals of the energization control device 13b.
  • the bus 14d is connected to the other one of the terminals.
  • a load 16b is connected to the bus 14d.
  • the bus 14c corresponds to the line on the first power supply side
  • the bus 14d corresponds to the line on the second power supply side.
  • the bus 14c described above is connected to one of the two terminals of the energization control device 13c.
  • the bus 14b is connected to the other one of the terminals. Only the power supply 12 is connected to the bus 14b.
  • the bus 14d corresponds to the line on the first power supply side
  • the bus 14b corresponds to the line on the second power supply side.
  • the loads 16a and 16b are connected to different buses 14c and 14d via the energization control device 13b.
  • the load 16a is arranged on the first power supply side and the load 16b is arranged on the second power supply side with respect to the energization control device 13b. Therefore, as in the above example, only the power failure portion can be separated.
  • the buses 14c and 14d may be connected to a power supply different from the first power supply and the second power supply.
  • the two energization control devices 13 are integrated as one control unit 80.
  • the control unit 80 has a 2-in-1 package structure including the two energization control devices 13.
  • the power supply system 10 includes one energization control device 13 and one control unit 80.
  • the control unit 80 has three terminals. Of the two terminals that electrically connect the power sources 11 and 12, one is connected to the bus 14a, and the other one is connected to the bus 14d. The third terminal is provided at the connection point of the energization control device 13. Loads 16a and 17 are connected to this terminal.
  • One energization control device 13 included in the control unit 80 is arranged between the loads 16a and 16b.
  • the power supply system 10 shown in FIG. 12 includes two control units 80a and 80b similar to the control unit 80 shown in FIG. 11(b).
  • the control units 80a and 80b each include two energization control devices 13.
  • the control units 80a and 80b are connected in series via the bus 14e.
  • the loads 16a and 17 are connected to the terminals provided at the connection points between the energization control devices 13.
  • the load 16b is connected to a terminal provided at the connection point between the energization control devices 13.
  • two energization control devices 13 are arranged in series between the loads 16a and 16b.
  • the load 16a is arranged on the first power source side and the load 16b is arranged on the second power source side with respect to the connection point of the two energization control devices 13 arranged between the loads 16a and 16b, that is, the bus 14e. .. Therefore, it is possible to make the cutoff function redundant so as to keep the function of one of the redundant loads 16a and 16b separated by separating the abnormal portion.
  • the power supply system 10 shown in FIG. 13 is a ring type system in which the above backbones are connected in a ring. Also in FIG. 13, terminals (for example, terminals 21 and 22) are omitted for convenience of illustration.
  • the power supply system 10 includes six energization control devices 13a to 13f as the energization control device 13. Each of the energization control devices 13a to 13f includes two terminals.
  • the bus 14a is connected to one of the terminals of the energization control device 13a, and the bus 14c is connected to the other one.
  • the bus 14c is connected to one of the terminals of the energization control device 13b, and the bus 14d is connected to the other terminal.
  • the bus 14d is connected to one of the terminals of the energization control device 13c, and the bus 14b is connected to the other terminal.
  • only the load 16a is connected to the bus 14c, and only the load 17a is connected to the bus 14d.
  • the remaining three energization control devices 13d, 13e, 13f are arranged in series between the first power supply and the second power supply.
  • the energization control devices 13d to 13f are provided in parallel with the energization control devices 13a to 13c.
  • the bus 14a is connected to one of the terminals of the energization control device 13d, and the bus 14f is connected to the other terminal.
  • the bus 14f is connected to one of the terminals of the energization control device 13e, and the bus 14g is connected to the other terminal.
  • the bus 14g is connected to one of the terminals of the energization control device 13f, and the bus 14b is connected to the other terminal.
  • a load 17b is connected to the bus 14f, and a load 16b is connected to the bus 14g. Like the load 17, the loads 17a and 17b are general loads.
  • the energization control device 13 is arranged between the loads 16a and 16b in the power line.
  • One energization control device 13a is arranged between the load 16a and the first power supply, and two energization control devices 13b and 13c are arranged between the load 16a and the second power supply.
  • Two energization control devices 13d and 13e are arranged between the load 16b and the first power supply, and one energization control device 13f is arranged between the load 16b and the second power supply.
  • the load 16a is arranged on the first power supply side
  • the load 16b is arranged on the second power supply side. Therefore, only the power failure part can be separated.
  • buses 14c, 14d, 14f, and 14g may be connected to a power source different from the power sources 11 and 12. Further, the connection positions of the loads 16a and 16b are not limited to the example shown in FIG. At least one energization control device 13 may be arranged between them.
  • FIGS. 14, 15 and 16 show examples in which the energization control devices 13 are integrated as shown in FIGS. 11B and 12 in the ring type power supply system 10 shown in FIG.
  • terminals for example, terminals 21 and 22
  • FIGS. 14, 15, and 16 show examples in which the energization control devices 13 are integrated as shown in FIGS. 11B and 12 in the ring type power supply system 10 shown in FIG.
  • terminals for example, terminals 21 and 22
  • the power supply system 10 shown in FIG. 14A includes two control units 80c and 80d.
  • the control unit 80c includes two energization control devices 13 corresponding to the energization control devices 13a and 13b shown in FIG.
  • the control unit 80d includes two energization control devices 13 corresponding to the energization control devices 13d and 13e.
  • the power supply system 10 includes two energization control devices 13 corresponding to the energization control devices 13c and 13f, in addition to the control units 80c and 80d.
  • the power supply system 10 shown in FIG. 14B includes three control units 80c, 80d, 80e.
  • the control unit 80e includes the two energization control devices 13 shown in FIG.
  • the power supply system 10 shown in FIG. 15(a) includes two control units 81a and 81b.
  • the control unit 81a includes three energization control devices 13 corresponding to the energization control devices 13a, 13b, and 13c shown in FIG.
  • the control unit 81b includes three energization control devices 13 corresponding to the energization control devices 13d, 13e, and 13f.
  • the control units 81a and 81b each have a 3-in-1 package structure.
  • the power supply system 10 shown in FIG. 15B includes one control unit 82.
  • the control unit 82 includes six energization control devices 13.
  • the control unit 82 has a 6-in-1 package structure.
  • two control units 80c and 80f are arranged in series between the power supplies 11 and 12. Further, two control units 80d and 80g are arranged in series between the first power supply and the second power supply. The control units 80d and 80g are arranged in parallel with the control units 80c and 80f.
  • two energization control devices 13 are arranged between the loads 16a and 17a.
  • Two energization control devices 13 are arranged between the loads 16b and 17b.
  • the load 16a is arranged on the first power supply side with respect to the connection point of the two energization control devices 13 arranged between the loads 16a and 17a, that is, the bus 14e.
  • the load 16b is arranged on the second power supply side with respect to the connection point of the two energization control devices 13 arranged between the loads 16b and 17b, that is, the bus 14h.
  • One energization control device 13 is arranged between the load 16a and the first power supply, and three energization control devices 13 are arranged between the load 16a and the second power supply. Three energization control devices 13 are arranged between the load 16b and the first power supply, and one energization control device 13 is arranged between the load 16b and the second power supply.
  • the load 16a is arranged on the first power supply side, and the load 16b is arranged on the second power supply side. Therefore, it is possible to make the cutoff function redundant so as to keep the function of one of the redundant loads 16a and 16b separated by separating the abnormal portion.
  • the energization control device A first terminal and a second terminal connected to the outside, A plurality of switches provided in parallel between the first terminal and the second terminal, A control unit that controls the driving of a plurality of switches, And a determination unit that determines whether or not an ON failure has occurred in the switch,
  • the control unit holds the ON state of the first switch, which is a part of the plurality of switches, during the energization period of the first terminal and the second terminal, and the resistance value of the second switch, which is the remaining switch, is higher than the ON state. Then, the determination unit determines whether or not the second switch has an on-failure based on the change in the physical quantity associated with the change in the resistance value.
  • the power supply system 110 includes power supplies 111 and 112 and an energization control device 113.
  • the power supply system 110 supplies electric power to various devices mounted on the vehicle.
  • the power supply 111 of this embodiment is a lead storage battery.
  • the power supply 112 is a lithium ion battery.
  • a bus 114a is connected to the positive electrode of the power supply 111.
  • a generator 115 is connected to the bus 114a.
  • the generator 115 generates electric power.
  • the power supply 111 and the generator 115 are the first power supply connected to the bus 114a.
  • a load may be connected to the bus 114a.
  • a bus 114b is connected to the positive electrode of the power supply 112.
  • the power supply 112 is a second power supply connected to the bus 114b.
  • Two energization control devices 113 are arranged in series between the power supplies 111 and 112, that is, between the buses 114a and 114b.
  • the two energization control devices 113 are connected via a bus 114c. It is also possible to adopt a configuration in which a load is connected to the bus 114b or the bus 114c.
  • one of the energization control devices 113 may be referred to as an energization control device 113a, and the other may be referred to as an energization control device 113b.
  • the energization control device 113a is arranged on the first power supply side (power supply 111 side), and the energization control device 113b is arranged on the second power supply side (power supply 112 side).
  • Different reference numerals are given to some of the constituent elements of the energization control devices 113a and 113b, and the same reference numerals are given to other portions for convenience.
  • the energization control device 113 will be described with reference to FIGS. 17 and 18.
  • the energization control device 13 includes a first terminal 121, a second terminal 122, and a third terminal 123 that are external connection terminals, a plurality of switches SW100, and a controller 150, respectively.
  • the 1st terminal 121, the 2nd terminal 122, and the 3rd terminal 123 may be called terminals 121, 122, and 123.
  • the energization control device 113 has, as the switch SW100, two switches SW101 and 102 connected in series in the main path of the current (power supply line). As the switches SW101 and SW102, the same configuration as the switch SW shown in the previous embodiment can be adopted. Each switch SW100 is configured to include two MOSFETs 140.
  • the switch SW101 shown in FIG. 17 includes, as the MOSFET 140, two n-channel type MOSFETs 141a and 141b.
  • the sources of the MOSFETs 141a and 141b are connected to each other.
  • the parasitic diodes are arranged opposite to each other, and the anodes are connected to each other.
  • the switch SW102 includes, as the MOSFET 140, two n-channel type MOSFETs 142a and 142b.
  • the sources of the MOSFETs 142a and 142b are connected to each other.
  • the parasitic diodes are arranged opposite to each other, and the anodes are connected to each other.
  • switches SW101 and SW102 on the energization control device 113a side may be referred to as switches SW101a and SW102a
  • switches SW101 and SW102 on the energization control device 113b side may be referred to as switches SW101b and SW102b.
  • the drains of the MOSFET 142b of the switch SW102a and the MOSFET 141a of the switch SW101b are connected to each other. That is, in the path 130 connecting the terminals 121 and 122, the two switches SW101 and SW102 are connected in series.
  • the path 130 corresponds to the main path of current.
  • the first terminal 121 is connected to one end of the switch SW101a (drain of the MOSFET 141a) and the second terminal 122 is connected to one end of the switch SW102a (drain of the MOSFET 142b).
  • the third terminal 123 is connected to the connection point of the switches SW101a and SW102a.
  • one end of the SW 101b (drain of the MOSFET 145a) is connected to the first terminal 121, and one end of the switch SW102b (drain of the MOSFET 146b) is connected to the second terminal 122.
  • the third terminal 123 is connected to the connection point of the switches SW101b and SW102b.
  • the first terminal 121 of the energization control device 113a is connected to the bus 114a, and the second terminal 122 is connected to the bus 114c.
  • a load 116 a which is a redundant load
  • a load 117 which is a general load
  • the first terminal 121 is connected to the line on the first power supply side
  • the second terminal 122 is connected to the line on the second power supply side.
  • the loads 116a and 117 are a load group (first load group) connected to the third terminal 123.
  • the number of loads included in the load group is not limited to two. It may include more than two loads.
  • the first terminal 121 of the energization control device 113b is connected to the bus 114c, and the second terminal 122 is connected to the bus 114b.
  • a load 116b which is a redundant load, is connected to the third terminal 123.
  • the first terminal 121 is connected to the line on the first power supply side, and the second terminal 122 is connected to the line on the second power supply side.
  • a load different from the load 116b may be connected to the third terminal 123.
  • a plurality of loads including the load 116b form a load group (second load group).
  • the load 116a is a camera and the load 116b is a LIDAR.
  • controller 150 is provided by a control system including at least one computer.
  • the means and/or functions provided by controller 150 may be provided by hardware only, software only, or a combination thereof. In this embodiment, it is realized by using an ASIC.
  • the controller 150 has a drive circuit 151, a determination circuit 152, a control circuit 153, and a communication circuit 154.
  • the drive circuit 151 generates drive signals for the switches SW101 and SW102 according to the control signal from the control circuit 153, and outputs the drive signals to the gates of the corresponding switches SW101 and SW102.
  • an overcurrent flows.
  • the determination circuit 152 detects a current flowing through each of the switches SW101 and SW102. Then, the detected current is compared with the overcurrent threshold to determine whether or not an overcurrent is flowing. In this way, it is determined based on the currents flowing through the switches SW101 and SW102 whether or not an abnormality has occurred in a portion of the power supply system 110 outside the energization control device 113. In the present embodiment, when the state in which the overcurrent threshold is exceeded continues for a predetermined monitoring time, it is determined that the overcurrent state.
  • the determination circuit 152 of this embodiment detects a voltage that correlates with the current flowing through the switches SW101 and SW102.
  • the determination circuit 152 detects the voltage across the switch SW101 and the voltage across the switch SW102, respectively.
  • the determination circuit 152 compares each of the detected both-end voltages with a threshold value Vref that is an overcurrent threshold value, and outputs the comparison result as an overcurrent determination signal.
  • the determination circuit 152 is configured to detect and determine a current flowing from the first terminal 121 to the second terminal 122, a current flowing from the second terminal 122 to the first terminal 121, that is, a bidirectional current. ..
  • the determination circuit 152 corresponds to the determination unit.
  • the output of the voltage detection circuit (op amp) is set to a predetermined value higher than 0V (for example, 2.5V), and when the current flows in one direction, a voltage higher than the predetermined value and in the opposite direction. When flowing, a voltage lower than a predetermined value is output.
  • the determination circuit 152 has, as the threshold value Vref, a threshold value higher than a predetermined value and a threshold value lower than the predetermined value, whereby bidirectional overcurrent can be determined.
  • two sets of an operational amplifier and a comparator for comparing the output of the operational amplifier with the threshold value Vref may be provided, and the connection of the inverting input terminal and the non-inverting input terminal may be reversed between the two operational amplifiers.
  • An ECU 105 provided outside the energization control device 13 is connected to the controller 150.
  • the controller 150 and the ECU 105 can communicate with each other via the vehicle-mounted network bus 106.
  • the controllers 150 of different energization control devices 113 can also communicate with each other via the bus 106.
  • the control circuit 153 acquires a command value from the ECU 105, which is, for example, a host control device, via the communication circuit 154.
  • the control circuit 153 generates a control signal for the switch SW based on the acquired command value, the power storage state of the power supplies 111 and 112, and outputs the control signal to the drive circuit 151.
  • the buses 114a and 114b are provided with voltage sensors that detect the battery voltages of the power supplies 111 and 112, respectively.
  • the controller 150 calculates, for example, the SOC of the power supply 112, and controls the charge amount and the discharge amount of the power supply 112 so that the SOC is maintained within a predetermined usage range.
  • the control circuit 153 and the drive circuit 151 correspond to a control unit.
  • the truth table included in the controller 150 is a map showing a combination of an overcurrent determination pattern and a breaking switch that is forcibly turned off when an overcurrent determination is made.
  • a truth table is stored in the memory of the controller 150.
  • the control circuit 153 of the controller 150 executes forced shutoff of the switches SW101 and SW102 according to the truth table.
  • the cutoff switch is a switch that is forcibly cut off by the controller 150's own judgment.
  • the truth table shown in FIG. 19 is used by each of the energization control devices 113a and 113b.
  • the truth table can be used when all the switches SW100 are controlled to be in the ON state.
  • the truth table can also be used when one of the switches SW101 and SW102 is cut off by the cutoff process described later.
  • the detection pattern #6 is a pattern in which an overcurrent in the leftward flow is detected in the switches SW101 and SW102.
  • the control circuit 153 shuts off the most downstream switch, that is, the switch SW101 in the flow direction of the overcurrent, and does not shut off the upstream switch SW102. In this way, the switch SW101 connected to the first terminal 121, which is the terminal closest to the abnormal site, is turned off.
  • the detection pattern #11 is a pattern in which an overcurrent in the rightward flow is detected in the switches SW101 and SW102.
  • the control circuit 153 shuts off the most downstream switch in the flow direction of the overcurrent, that is, the switch SW102, and does not shut off the upstream switch SW101.
  • the switch SW102 connected to the second terminal 122 which is the terminal closest to the site where the abnormality has occurred, is switched to the off state.
  • the detection pattern #10 is a pattern in which the right current overcurrent is detected for the switch SW101 and the left current overcurrent is detected for the switch SW102. Since both the switches SW101 and SW102 flow toward the third terminal 123 side, in other words, the flow is inward, the control circuit 153 cuts off both the switches SW101 and SW102. In this way, the switches SW101 and SW102 connected to the third terminal 123, which is the terminal closest to the abnormal portion, are switched to the off state.
  • the detection pattern #1 is a pattern in which neither the switch SW101 nor the switch SW102 is overcurrent detected. In this case, the control circuit 153 does not cut off (turn off) the switches SW101 and SW102. For other detection patterns (#2 to #5, #7 to #9, #12 to #16), the operations of the switches SW101 and SW102 can be set arbitrarily. In this embodiment, similarly to the detection pattern #1, neither of the switches SW101 and SW102 is cut off. In the truth table, “shut off” is processed prior to the command from the ECU 105 for prompt processing. The command of the ECU 105 is prioritized for “do not shut off”. Even if the controller 150 determines that the detection pattern is #6, if the command from the ECU 105 instructs the switch SW102 to be shut off, the switch SW102 is shut off.
  • one of the switches SW101 and SW102 detects an overcurrent and the other one does not detect an overcurrent, depending on the positional relationship with the abnormal part, the monitoring time, and the like. Therefore, for example, in the case of detection pattern #3, the switch SW102 may be cut off and the switch SW101 may not be cut off. In the case of detection pattern #5, the switch SW101 may be cut off and the switch SW102 may not be cut off. Further, in the case of the detection patterns #2 and #9, the switches SW101 and SW102 may be cut off.
  • each controller 150 of the energization control device 113 specifically, an overcurrent process will be described with reference to FIG.
  • the controller 150 repeatedly executes the following processing in a predetermined cycle during a period in which the controller 150 operates according to a command from the ECU 105.
  • the controller 150 first determines whether or not an overcurrent is detected (step S30). In this embodiment, it is determined whether the voltage across the switches SW101 and SW102 exceeds a predetermined threshold voltage. The controller 150 performs the detection of overcurrent in parallel with the normal operation process based on the command from the ECU 105.
  • step S30 the controller 150 clears the count value of the elapsed counter (step S31) and ends the series of processes.
  • the counter is incremented (+1) (step S32). A counter that counts down may be used instead of the counter that counts up.
  • step S33 the controller 150 determines whether the count value of the counter exceeds the overcurrent monitoring time Tf (step S33). When the count value exceeds the monitoring time Tf, it is determined that an overcurrent has occurred, and the controller 150 executes a cutoff process (step S34). If the count value does not exceed the monitoring time Tf, the process returns to step S30.
  • step S34 the controller 150 executes the shutoff process according to the truth table described above. For example, when a leftward overcurrent is detected in the switches SW101 and SW102 at the time when the count value exceeds the monitoring time Tf, the detection pattern #6 is controlled. That is, the switch SW101 is cut off (turned off). The controller 150 gives priority to the normal operation instructed by the ECU 105 and shuts off the corresponding switch SW100.
  • the controller 150 transmits the detection pattern adopted in step S34 to the outside (step S35). That is, information on the switch SW100 that has been cut off (off) is transmitted. In this embodiment, it transmits to the ECU 105 via the bus 106.
  • the ECU 105 is configured to optimize the interruption of the entire power supply system 110.
  • the ECU 105 acquires the detection pattern from each energization control device 113.
  • the switch SW100 that should be cut off as the power supply system 110 for disconnecting the abnormality occurrence part is determined and transmitted to each energization control device 113 as optimization information.
  • the switch SW100 to be cut off is a switch SW100 that is necessary and sufficient for disconnection.
  • the optimum switch SW100 for the power supply system 110 will be described later.
  • step S36 determines whether or not optimization information has been received within a predetermined time after executing the transmission process of step S35 (step S36). If not received, the series of processes is terminated.
  • step S36 the controller 150 determines whether or not the switch SW100 forcibly shut off by its own judgment matches the received optimization information (step S37). If they match, the series of processes is terminated. If they do not match, the switch SW100 that does not match is released from the cutoff state (step S38), and the series of processes is terminated.
  • the detection pattern transmitted by the energization control device 113 indicates overcurrent detection
  • the detection pattern may also serve as a diagnostic signal.
  • the ECU 105 executes a predetermined process such as notification to the outside or switching to a predetermined mode.
  • the ECU 105 When the ECU 105 identifies the switch SW100 to be shut off based on the detection pattern, it sends a command to turn on/off the switch SW100 excluding the shutoff switch as a subsequent command. Therefore, the controller 150 of the energization control device 113 controls driving of switches other than the cutoff switch as a normal operation process based on the command.
  • the series of processes may end. That is, the configuration may be such that the processes of steps S35 to S38 are not executed.
  • Two or more conditions for overcurrent determination may be provided. That is, two or more sets of the overcurrent threshold and the monitoring time may be provided. For example, if at least one of the following three conditions is satisfied, the switch SW100 satisfying the condition may be determined to be an overcurrent so as not to erroneously detect an inrush current generated when a high power product is driven.
  • First condition When 300 A or more is continued for 30 ⁇ s, it is determined that overcurrent.
  • Sacond condition If 200 A or more is continued for 1 ms, it is determined as an overcurrent.
  • (Third condition) If 100 A or more is continued for 100 ms, it is determined that an overcurrent has occurred.
  • the timing of determining the overcurrent of the switches SW101 and SW102 deviates due to the positional relationship with the abnormal part.
  • the shutoff process shown in step S34 may be executed after a predetermined time has elapsed after the overcurrent is confirmed for one switch SW100.
  • the disconnection process can be executed for all the switches SW100 for which the overcurrent has been determined during the elapse of the predetermined time.
  • FIG. 21 is a diagram showing the relationship between the direction in which overcurrent flows in the two energization control devices 113a and 113b and the cutoff switch when an abnormality occurs at the five points A to E shown in FIG.
  • Point A is outside the first terminal 121 of the energization control device 113a (on the side of the power supply 111).
  • Point B is outside the third terminal 123 of the energization control device 113a (on the side of the loads 116a and 117).
  • Point C is between the energization control devices 113a and 113b (bus 114c).
  • Point D is outside the third terminal 123 of the energization control device 113b (on the side of the load 116b).
  • Point E is outside the second terminal 122 of the energization control device 113b (on the side of the power supply 112).
  • FIG. 21 an example in which a ground fault occurs as an abnormality is shown.
  • the x mark shown in FIG. 21 simply indicates the occurrence point of the ground fault.
  • a broken line circle shown in FIG. 21 indicates the switch SW100 which is forcibly shut off by the energization control device 113 by its own judgment.
  • the switch to be shut off shown in FIG. 21 is a switch that is necessary and sufficient for disconnecting the abnormal part in the power supply system 110. In the present embodiment, it is the switch SW100 for the optimization information transmitted by the command from the ECU 105.
  • a left overcurrent flows through the switches SW101a and SW102a of the energization control device 113a. Further, a leftward overcurrent flows through the switches SW101b and SW102b of the energization control device 113b.
  • the controller 150 (control circuit 153) of the energization control device 113a forcibly switches the most downstream switch SW101a to the off state according to the truth table described above.
  • the controller 150 (control circuit 153) of the energization control device 113b forcibly switches the most downstream switch SW101b to the off state according to the above truth table. In this way, the switches SW101a and SW101b are forcibly cut off.
  • the switch SW100 closest to the point A is the switch SW101a.
  • the ECU 105 determines that the switch SW100 to be shut off is the switch 101a, and transmits it as optimization information to each energization control device 113. Accordingly, the energization control device 113a continues to disconnect the switch SW101a, and the energization control device 113b releases the disconnection of the switch SW101b.
  • the switch SW101b can be turned on/off based on a command from the ECU 105.
  • the switches SW100 closest to the point B are the switches SW101a and SW102a.
  • the ECU 105 determines that the switch SW100 to be shut off is the switch 101a or SW102a, and transmits it as optimization information to each energization control device 113. Accordingly, the energization control device 113a continues to disconnect the switches SW101a and SW102a, and the energization control device 113b releases the disconnection of the switch SW101b.
  • a rightward overcurrent flows in both switches SW101a and SW102a of the energization control device 113a. Further, a leftward overcurrent flows through the switches SW101b and SW102b of the energization control device 113b.
  • the controller 150 of the energization control device 113a forcibly shuts off the most downstream switch SW102a according to the above truth table.
  • the controller 150 of the energization control device 113b forcibly shuts off the most downstream switch SW101b according to the above truth table.
  • the switches SW100 closest to the point C are the switches SW102a and SW101b.
  • the ECU 105 determines that the switch SW100 to be shut off is the switches SW102a and SW101b, and transmits it as optimization information to each energization control device 113. Therefore, the energization control device 113a continues to shut off the switch SW102a, and the energization control device 113b continues to shut off the switch SW101b.
  • a rightward overcurrent flows in the switches SW101a and SW102a of the energization control device 113a.
  • an overcurrent flows rightward in the switch SW101b and flows leftward in the switch SW102b of the energization control device 113b.
  • the controller 150 of the energization control device 113a forcibly shuts off the most downstream switch SW102a according to the above truth table.
  • the controller 150 of the energization control device 113b forcibly shuts off the switches SW101b and SW102b according to the above truth table.
  • the switches SW100 closest to the point D are the switches SW101b and SW102b.
  • the ECU 105 determines that the switch SW100 to be shut off is the switches SW101b and SW102b, and transmits it as optimization information to each energization control device 113. Therefore, the energization control device 113a releases the disconnection of the switch SW102a, and the energization control device 113b continues to disconnect the switches SW101b and SW102b.
  • a rightward overcurrent flows through the switches SW101a and SW102a of the energization control device 113a. Further, a rightward overcurrent flows in each of the switches SW101b and SW102b of the energization control device 113b.
  • the controller 150 of the energization control device 113a forcibly shuts off the most downstream switch SW102a according to the above truth table.
  • the controller 150 of the energization control device 113b forcibly shuts off the most downstream switch SW102b according to the above-mentioned truth table.
  • the switch SW100 closest to the point E is the switch SW102b.
  • the ECU 105 determines that the switch SW100 to be shut off is the switch SW102b, and transmits it as optimization information to each energization control device 113. Therefore, the energization control device 113a releases the cutoff of the switch SW102a, and the energization control device 113b continues the cutoff of the switch SW102b.
  • the energization control device 113 it is possible to detect the current flowing through each of the switches SW100 and determine whether the overcurrent is flowing. Also, the direction of the current can be detected. Then, based on the direction in which the overcurrent flows, the switch SW100 connected to the terminal closest to the abnormal site can be turned off. Therefore, even if an abnormality occurs outside any of the terminals, it can be shut off.
  • the controller 150 of the energization control device 113 determines the SW 100 to be shut off based on the direction of the overcurrent. Therefore, as compared with a configuration in which the switch SW100 is shut off based on a command from the ECU 105 and a configuration in which the energization control devices 113 share information to shut off the switch SW100, the abnormality occurrence portion is immediately disconnected as much as there is no communication loss. be able to. As an emergency measure, it is possible to immediately disconnect the abnormal part by the self-determination of the energization control device 113. As a result, it is possible to maintain the desired function by continuing the power supply to the normal part where no abnormality has occurred.
  • the overcurrent is determined by detecting the current flowing through the switches SW101 and SW102 provided on the main path of the current (path 130). No other switch is used for overcurrent determination.
  • the number of switches SW100 is smaller than the number of terminals 121, 122, 123. Thereby, the configuration of the energization control device 113 can be simplified. Also, the manufacturing cost can be reduced.
  • the switches SW101 and SW102 are connected in series in the path 130 that connects the first terminal 121 on the first power supply side and the second terminal 122 on the second power supply side.
  • the third terminal 123 is connected to the connection point of the switches SW101 and SW102.
  • the loads 116a, 116b, 117 are connected to the third terminal 123. Therefore, even if an abnormality such as a battery failure or a bus ground fault occurs on one of the first power supply side and the second power supply side, the power failure of the loads 116a, 116b, 117 can be prevented.
  • a plurality of energization control devices 113a and 113b are arranged in series between the first power supply and the second power supply. Therefore, the loads 116a and 116b can be distributed to the different energization control devices 113a and 113b and connected to the third terminal 123. According to this aspect, even if an abnormality occurs at any of the points A to E shown in FIG. 17, that is, outside of which terminal, at least one of the loads 116a and 116b is prevented from suffering a power failure, thereby ensuring a desired function. be able to.
  • the most downstream switch SW100 when the continuous currents of two or more consecutive switches SW101 and SW102 have the same overcurrent direction, the most downstream switch SW100 is turned off. .. By shutting off the switch SW100 on the most downstream side, it is possible to immediately disconnect the abnormal part. For example, when the most downstream is the first power supply side, the first power supply can be disconnected. When the most downstream is the second power source side, the second power source can be disconnected.
  • both the switches SW101 and SW102 are turned off. Switch to. For example, even if an abnormality such as a ground fault occurs in the load (for example, the load 116b) connected to the third terminal 123, the switch SW101 and SW102 can be cut off to immediately disconnect the abnormality occurrence site.
  • the load for example, the load 116b
  • the energization control device 113 includes the communication circuit 154, and the control circuit 153 transmits a detection pattern, that is, information regarding the interrupted switch SW100 to the ECU 105 via the communication circuit 154. Then, based on the optimization information transmitted from the ECU 105, the switch SW100 that has been forcibly cut off is released or retained. According to this, it is possible to initially disconnect the abnormality occurrence site by the judgment of the controller 150, and to shut off only the switch SW100 necessary for finally separating the abnormality occurrence site. Therefore, it is possible to increase the number of devices that continue to function depending on the abnormality occurrence site.
  • the present invention is not limited to this. It can also be applied to a configuration in which three or more energization control devices 113 are arranged in series between the power supplies 111 and 112. For example, the load can be arranged in three places.
  • the optimization of the SW 100 to be cut off is not limited to the form realized with the ECU 105.
  • the energization control devices 113 can also communicate with each other via the bus 106.
  • the detection pattern used for the interruption processing that is, the information about the interrupted switch SW100 is shared by the controllers 150 by communication. Then, among the switches SW100 initially shut off by self-determination, only the switch SW100 that is the most suitable for disconnecting the abnormal portion may be continued to be shut off, and if there is any other switch SW100, the shutoff may be released. ..
  • the drain-source voltage (Vds) may be detected for one of the two MOSFETs 140 included in the switch SW100.
  • the shunt resistor 160 may detect the current as shown in FIG. In FIG. 22, the shunt resistor 160 that detects the current flowing through the switch SW101 is provided closer to the first terminal 121 side than the switch SW101, and the shunt resistor 160 that detects the current flowing through the switch SW102 is closer to the first terminal than the switch SW102. It is provided on the 121 side.
  • the position of the shunt resistor 160 is not limited to the example shown in FIG.
  • each of the switches SW101 and SW102 may be provided between the MOSFETs 140.
  • the shunt resistor 160 corresponding to the switch SW101 may be provided closer to the second terminal 122 side than the switch SW101, and the shunt resistor 160 corresponding to the switch SW102 may be provided closer to the second terminal 122 side than the switch SW102.
  • MOSFETs 141a and 141b forming the switch SW101 are provided with sense MOSs 141as and 141bs, respectively.
  • MOSFETs 142a and 142b forming the switch SW102 are provided with sense MOSs 142as and 142bs, respectively. Note that only one of the sense MOSs 141as and 141bs may be provided. Only one of the sense MOSs 142as and 142bs may be provided.
  • the number of the plurality of switches SW100 connected in series in the path 130 between the terminals 121 and 122 is not limited to the above two. You may provide three or more. In the example shown in FIG. 24, three switches SW100 are connected in series on the path 130.
  • the energization control device 113 has a switch SW103 added to the configuration shown in FIG. One end of the switch SW103 is connected to the switch SW102, and the other end is connected to the second terminal 122.
  • the energization control device 113 includes two third terminals 123a and 123b as the third terminal 123.
  • the third terminal 123a is connected to the connection point of the switches SW101 and SW102, as in FIG.
  • the third terminal 123b is connected to the connection point of the switches SW102 and SW103.
  • FIG. 25 and 26 are truth table used by the controller 150 of the energization control device 113 shown in FIG.
  • FIG. 25 shows detection patterns #1 to #32, and
  • FIG. 26 shows detection patterns #33 to #64.
  • the overcurrent direction is the same for all the switches SW100, the most downstream switch SW100 is cut off, and the remaining switches SW100 are not cut off.
  • the detection patterns #22 and #43 correspond.
  • the switch SW100 on the most downstream side is shut off.
  • the detection patterns #22, #38, #42, and #43 correspond.
  • the switch SW102 on the most downstream side is shut off, and the remaining switches SW103 are not shut off.
  • the two switches SW100 having the third terminal 123 connected therebetween when the overcurrents are both directed to the third terminal 123, that is, inward, the two switches SW100 are both cut off.
  • the detection patterns #38 and #42 correspond. For example, in the case of detection pattern #38, since the direction of the overcurrent flowing through the switch SW101 is rightward and the current flowing through the switch SW102 is leftward, both switches SW101 and SW102 are cut off.
  • the detection patterns other than #1, #22, #38, #42, and #43 described above can be arbitrarily set.
  • FIG. 27 An example has been shown in which the two switches SW101 and SW102 are both configured by the two MOSFETs 140, but the invention is not limited to this.
  • the configuration shown in FIG. 27 may be used.
  • the terminals 121, 122, and 123 are omitted for the sake of convenience.
  • the energization control device 113a includes two switches SW101 and SW102c.
  • the switch SW102c is configured to include only one MOSFET 140.
  • the source of the MOSFET 140 is connected to the bus 114c via a second terminal 122 (not shown), and the drain is connected to the switch SW101.
  • the energization control device 113b also includes two switches SW101c and SW102.
  • the switch SW101c includes only one MOSFET 140. In the switch SW101c, the source of the MOSFET 140 is connected to the bus 114c via a first terminal 121 (not shown), and the drain is connected to the switch SW102.
  • the energization control device 113a includes two switches SW101 and SW102d.
  • the switch SW102d is configured to include only one MOSFET 140.
  • the drain of the MOSFET 140 is connected to the bus 114c via a second terminal 122 (not shown), and the source is connected to the switch SW101.
  • the energization control device 113b also includes two switches SW101d and SW102.
  • the switch SW101d includes only one MOSFET 140.
  • the drain of the MOSFET 140 is connected to the bus 114c via a first terminal 121 (not shown), and the source is connected to the switch SW102.
  • the sources of the switches SW102c and SW101c are electrically connected to each other. Since the anodes of the parasitic diodes are electrically connected to each other, even if the bus 114c is grounded, it can be cut off by the switches SW102c and SW101c. In the power supply system 110 shown in FIG. 27B, the drains of the switches SW102d and SW101d are electrically connected to each other.
  • FIG. 28 An example has been shown in which two energization control devices 113 having the same configuration are arranged in series between the first power supply (power supply 111) and the second power supply (power supply 112), but the invention is not limited to this.
  • one energization control device 113 and one energization control device 213 may be arranged between the first power supply and the second power supply. That is, the energization control device 113 according to this embodiment may be combined with the energization control device 213 having another configuration.
  • the energization control device 213 includes only one switch SW200. Like the switches SW101 and SW102, the switch SW200 is composed of two MOSFETs. In FIG. 28, the terminals 121, 122, and 123 are omitted for the sake of convenience.
  • a load 116b is connected to a bus 114c that connects the energization control devices 113 and 213.
  • the energization control device 113 has the forced shutoff function by self-determination as described above, and the energization control device 213 does not have this forced shutoff function. Therefore, the energization control device 213 may set the interruption conditions (overcurrent determination threshold value, determination monitoring time) so as to shut off after the energization control device 113.
  • the energization control device 213 may be replaced with the energization control device 13 shown in the preceding embodiment.
  • the ring-type power supply system 110 shown in FIG. 29 includes four energization control devices 113 (113a to 113d). Two energization control devices 113a and 113b are arranged in series between the first power supply and the second power supply. Two energization control devices 113c and 113d are arranged in series between the first power supply and the second power supply. The energization control devices 113c and 113d are connected via a bus 114d. The energization control devices 113c and 113d are provided in parallel with the energization control devices 113a and 113b. In FIG. 29, the terminals 121, 122, and 123 are omitted for convenience of illustration.
  • the loads 116a and 117a are connected to a third terminal 123 (not shown) of the energization control device 113a.
  • a load 117b is connected to a third terminal 123 (not shown) of the energization control device 113b.
  • a load 117c is connected to a third terminal 123 (not shown) of the energization control device 113c.
  • the load 116b is connected to the third terminal 123 (not shown) of the energization control device 113d.
  • the loads 117a, 117b, and 117c are also general loads.
  • FIG. 30 is a process executed by the controller 150.
  • the processes of steps S34A to S34D are the processes added to FIG. 20, and the other processes are the same as those of FIG.
  • step S34 determines whether the switch SW100 forcibly cut off by its own judgment is the most downstream switch SW100 among two or more continuous switches SW100 having the same overcurrent direction. Is determined (step S34A). For example, based on the detection pattern used in step S34, it is determined whether the switch SW100 is the most downstream switch. If the switch SW100 is not the most downstream switch SW100, the process proceeds to step S35.
  • the controller 150 determines whether or not the current flowing through the interrupted switch SW100 is less than a predetermined threshold value Iths (step S34B).
  • the threshold value Iths is a threshold value for determining whether or not a current is flowing, that is, whether or not the current is cut off. For example, when the control of the detection pattern #6 is performed in step S34, it is determined whether or not the current flowing through the switch SW101 at the most downstream switch SW101 is less than the threshold value Iths.
  • step S34B If it is determined to be less than the threshold value Iths in step S34B, the process proceeds to step S35. If it is determined that it is not less than the threshold value Iths, then the controller 150 determines whether or not the absolute value of the voltage across the switch SW100 that has been cut off is less than the predetermined threshold value Vths (step S34C).
  • the threshold value Vths is a threshold value for determining whether or not the switch SW100 has an ON failure. During the interruption (process), the voltage across both ends becomes larger than the threshold value Vths. When the ON failure occurs, the absolute value of the voltage between both ends is lower than the threshold value Vths. Therefore, in step S34C, when it is equal to or more than the threshold value Vths, the process returns to step S34B.
  • step S34C when the absolute value of the voltage across both ends falls below the threshold value Vths, it is determined that the switch SW100 that has been shut off has an ON failure, and the controller 150 forcibly shuts off the adjacent switch SW100 (step S34D). Then, a series of processing is ended.
  • the adjacent switch SW100 is a switch SW100 located next to the cutoff most downstream SW100 among two or more continuous switches SW100 having the same overcurrent direction. For example, in the case of detection pattern #6, the switch SW102 located next to the most downstream switch SW101 is shut off.
  • the controller 150 can immediately disconnect the abnormal portion by its own judgment.
  • This embodiment is a modification based on the preceding embodiment as a basic form.
  • an example in which the threshold value for the overcurrent determination and the monitoring time are constant has been shown. Instead of this, in this embodiment, the threshold for overcurrent determination and/or the overcurrent monitoring time can be switched.
  • the configuration of the power supply system 110 is the same as that of the preceding embodiment (see FIG. 17).
  • the controller 150 of the energization control device 113 has a function of detecting at least one voltage of the terminals 121, 122, and 123 and switching the overcurrent determination threshold value and/or the overcurrent monitoring time based on this voltage. doing.
  • the voltages of the terminals 121, 122, and 123 may be referred to as terminal voltages.
  • the determination circuit 152 described above detects the terminal voltage. Then, the overcurrent threshold and/or the monitoring time are switched. For example, the determination circuit 152 sets the overcurrent threshold to a smaller value as the terminal voltage is smaller. The determination circuit 152 shortens the monitoring time as the terminal voltage is smaller. The determination circuit 152 makes the overcurrent threshold smaller and the monitoring time shorter as the terminal voltage becomes smaller.
  • the determination circuit 152 is configured to keep the overcurrent threshold Ith constant and switch the monitoring time Tf.
  • FIG. 32 shows the relationship between the terminal voltage VB, the overcurrent threshold Ith, and the monitoring time Tf.
  • the overcurrent threshold Ith is a constant value (Ith0) regardless of the terminal voltage VB.
  • the monitoring time Tf switches in three stages based on the terminal voltage VB.
  • the longest Tl is set as the monitoring time Tf.
  • an intermediate value tm is set as the monitoring time Tf.
  • the terminal voltage VB is lower than the threshold value VthL
  • the shortest ts is set as the monitoring time Tf.
  • the controller 150 sets the monitoring time Tf based on the terminal voltage VB (step S30A).
  • the terminal voltage VB is acquired.
  • the monitoring time Tf is set based on the terminal voltage VB. For example, when threshold Vth ⁇ terminal voltage VB>threshold VthL, Tm is set as the monitoring time Tf.
  • step S30B determines whether or not an overcurrent is detected. If no overcurrent is detected in step S30B, the process of step S31 is executed, and the series of processes ends. On the other hand, when an overcurrent is detected in at least one of the switches SW100, the process of step S32 is executed. That is, the counter is incremented.
  • step S33 the controller 150 executes the process of step S33. That is, it is determined whether or not the count value of the counter exceeds the monitoring time Tf set in step S30A. If the count value exceeds the monitoring time Tf, it is determined that an overcurrent has occurred, and the controller 150 executes the interruption process of step S34. That is, similar to the preceding embodiment, the shutoff process is executed according to the truth table shown in FIG. After executing the blocking process, the series of processes is ended. On the other hand, if the count value does not exceed the monitoring time Tf, the process returns to step S30B.
  • the controller 150 may use at least one terminal voltage VB of the terminals 121, 122, 123 when setting the monitoring time Tf. You may use the terminal voltage VB of any one of the terminals 121, 122, and 123. You may use the terminal voltage VB of all the terminals 121,122,123. You may use the average value of the terminal voltage VB of all the terminals 121,122,123. With all the switches SW100 arranged between the terminals 121 and 122 turned on, the terminal voltages VB are substantially the same for the terminals 121, 122 and 123 of the same energization control device 113.
  • FIG. 34 is a timing chart of the terminal voltage in each energization control device 113, the current flowing through the switch SW100, and the drive signal when a ground fault occurs at the point E shown in FIG.
  • the terminal voltages VB1a and VB2a are the voltages of the terminals 121 and 122 of the energization control device 113a.
  • the terminal voltages VB1b and VB2b are voltages of the terminals 121 and 122 of the energization control device 113b.
  • the currents I101a and I102a are currents that flow through the switches SW101a and SW102a of the energization control device 113a.
  • the currents I101b and I102b are currents that flow through the switches SW101b and SW102b of the energization control device 113b.
  • the direction of the current flowing from the power supply 111 side to the second power supply 112 side is shown as positive.
  • the terminal voltage will drop.
  • the energization control device 113b is closer to the ground fault occurrence site than the energization control device 113a. Therefore, the terminal voltages V1b and V2b decrease with a larger gradient than the terminal voltages V1a and V2a. That is, the terminal voltages V1b and V2b have a larger voltage drop and fall faster.
  • the values of the terminal voltages VB1a and VB2a on the energization control device 113a side are higher than the threshold value VthH.
  • the values of the terminal voltages VB1b and VB2b on the energization control device 113b side are lower than the threshold value Vthh and higher than the threshold value VthL. Therefore, the energization control device 113a sets Tl as the monitoring time Tf, and the energization control device 113b sets Tm as the monitoring time Tf.
  • the current increases after time t1 and the count value of the energization control device 113b exceeds the set time Tm at time t22.
  • the power supply control device 113b first executes the shutoff process.
  • the switch SW102b is forcibly cut off.
  • the ground fault occurrence part is disconnected from the first power system by shutting off the switch SW102b.
  • the voltages VB1a, VB2a, VB1b at the terminals on the first power system side of the switch SW102b are restored to normal voltages.
  • the current flowing through each switch SW100 decreases.
  • the overcurrent state is released (count is cleared) before the count value of the energization control device 113a exceeds the set time Tl.
  • the controller 150 detects the terminal voltage VB when an overcurrent is detected, and sets the monitoring time Tf based on the detected terminal voltage VB.
  • the terminal voltage VB may be constantly or periodically checked during the monitoring time, and when the terminal voltage VB falls below the threshold value Vth, the monitoring time Tf may be switched to a shorter time.
  • the example of switching the monitoring time Tf in three steps has been shown, but the invention is not limited to this.
  • the switching may be performed in two stages or may be performed in four or more stages.
  • step S28 is added before step S30 in the process shown in FIG.
  • the controller 150 sets the overcurrent threshold Ith based on the terminal voltage VB.
  • the overcurrent threshold Ith is provided in multiple stages, and a smaller overcurrent threshold is set as the terminal voltage VB decreases.
  • FIG. 35 shows an example in which the overcurrent threshold Ith and the monitoring time Tf are set based on the terminal voltage VB, but the monitoring time Tf is fixed and the overcurrent threshold Ith is set based on the terminal voltage VB. May be
  • FIG. 36 shows the relationship between the direction in which overcurrent flows in the two energization control devices 113a and 113b and the switch SW100 forcibly shutting off when an abnormality occurs at the five points A to E shown in FIG. FIG.
  • the terminal voltage on the side of the energization control device 113a is VBa and the terminal voltage on the side of the energization control device 113b is VBb, and the terminal voltages VBa and VBb are compared.
  • the points A to E are the same as in the preceding embodiment. Similar to FIG. 21, the x mark simply indicates the occurrence point of the ground fault. Further, a broken line circle indicates the switch SW100 that is forcibly shut off by the self-determination of the energization control device 113.
  • the energization control device 113 near the ground fault occurrence site first executes the interruption processing.
  • the current flowing through the switch SW100 that has started to be cut off first decreases, but the current flowing through the other switch SW100 continues to flow because the path between the power system and the point C, which is the ground fault point, is not cut off.
  • the switch to be forcibly turned off matches the switch to be turned off.
  • the ground fault at point E is as explained in FIG. A rightward overcurrent flows through each of the switches SW101a, SW102a, SW101b, and SW102b. Since the energization control device 113b is closer to the ground fault occurrence portion, the terminal voltage VBb becomes lower than the terminal voltage VBa. Therefore, the power-supply control device 113b first executes the disconnection process to disconnect the most downstream switch SW102b.
  • the overcurrent threshold Ith and/or the monitoring time Tf is set based on the terminal voltage of at least one of the terminals 121, 122, 123. Therefore, in the configuration in which the plurality of energization control devices 113 are arranged in series between the power supplies 111 and 112, only the switch SW100 to be shut off can be forcibly shut down while the controller 150 makes its own judgment. Therefore, it is possible to eliminate the need for optimization processing after forced shutoff as an emergency measure.
  • the present invention is not limited to this. It can also be applied to a configuration in which three or more energization control devices 113 are arranged in series between the first power supply and the second power supply. Further, it can be applied to the configuration shown as a modified example in the second embodiment.
  • This embodiment is a modification based on the preceding embodiment as a basic form.
  • the example in which the switch SW100 to be forcibly turned off is determined based on the direction of the overcurrent.
  • the predetermined switch SW100 is forcibly cut off regardless of the direction of the overcurrent. Even if the predetermined switch SW100 is forcibly cut off, it is possible to prevent a power failure in at least one of the loads 116a and 116b and thereby ensure a desired function.
  • the configuration of the power supply system 110 according to this embodiment is the same as that of the preceding embodiment (see FIG. 17).
  • the truth table shown in (a) of FIG. 37 is used by the energization control device 113a.
  • the truth table has five detection patterns.
  • a predetermined (specific) switch SW100 is irrespective of the position of the switch SW100 in which the overcurrent flows and the direction of the overcurrent. Shut off. In this embodiment, only the switch SW102a on the second terminal 122 side is shut off.
  • Detection patterns #2 to #5 are patterns when an overcurrent is detected. For example, if a leftward overcurrent is detected in the switch 102a, the detection pattern #2 is applied.
  • the detection pattern #1 is assumed to be in a normal state, and is a pattern when neither the switch SW101a nor the switch SW102a detects an overcurrent.
  • the truth table shown in (b) of FIG. 37 is used by the energization control device 113b.
  • the truth table has five detection patterns.
  • a predetermined (specific) switch SW100 is irrespective of the position of the switch SW100 in which the overcurrent flows and the direction of the overcurrent. Shut off. In the present embodiment, only the switch SW101b on the first terminal 121 side is shut off.
  • Detection patterns #2 to #5 are patterns when an overcurrent is detected. For example, if a rightward overcurrent is detected in the switch 101b, the detection pattern #5 is applied.
  • the detection pattern #1 is assumed to be in a normal state, and is a pattern when neither the switch SW101b nor the switch SW102b detects an overcurrent.
  • the energization control devices 113b adjacent to each other are connected.
  • the switches SW102a and SW101b are cut off.
  • the switches SW102a and SW101b arranged between the loads 116a and 116b are cut off.
  • step S36 determines whether or not the switch SW100 forcibly shut off in step S35 is included in the optimization information, that is, whether or not the switch SW100 is to be shut down. Is determined (step S36A).
  • the controller 150 shuts off the switch SW100 whose drive is controlled by the controller 150 among the switches SW100 to be shut off included in the optimization information (step S36B). ).
  • the switch SW100 to be cut off is a switch SW100 necessary and sufficient for cutting off (cutting off) the abnormal part.
  • step S37 it is determined whether the blocked switch SW100 matches the optimization information. If they match, the series of processes is terminated. If they do not match, the process of step S38 is executed, the interruption of the switch SW100 that does not match is released, and the series of processes is ended.
  • FIG. 39 is a diagram showing the relationship between the direction in which the overcurrent flows in the two energization control devices 113a and 113b and the cutoff switch when an abnormality occurs at the five points A to E shown in FIG.
  • the points A to E are the same as in the preceding embodiment.
  • the x mark simply indicates the occurrence point of the ground fault.
  • a broken line circle indicates the switch SW100 that is forcibly shut off by the self-determination of the energization control device 113.
  • a leftward overcurrent flows in each switch SW101a, SW102a, SW101b, SW102b.
  • the predetermined switches SW102a and SW101b are forcibly shut off.
  • the switch SW100 closest to the point A is the switch SW101a.
  • the ECU 105 determines that the switch SW100 to be shut off is the switch 101a, and transmits it as optimization information to each energization control device 113.
  • the energization control device 113a shuts off the switch SW101a and releases the switch SW102a.
  • the energization control device 113b releases the cutoff of the switch SW101b.
  • a rightward overcurrent flows in each of the switches SW101a, SW102a, SW101b, and SW102b.
  • the predetermined switches SW102a and SW101b are forcibly shut off.
  • the switch SW100 closest to the point E is the switch SW102b.
  • the ECU 105 determines that the switch SW100 to be shut off is the switch SW102b, and transmits it as optimization information to each energization control device 113. Therefore, the energization control device 113a releases the cutoff of the switch SW102a.
  • the energization control device 113b releases the cutoff of the switch 101b and cuts off the switch SW102b.
  • the switches SW102a and SW101b on the terminal side to which the other energization control device 113 is connected are shut off. Even if an abnormality occurs outside any of the terminals, the controller 150 can continue the power supply to at least one of the loads 116a and 116b by an emergency measure based on the self-determination, thereby ensuring a desired function.
  • the present invention is not limited to this. It can also be applied to a configuration in which three or more energization control devices 113 are arranged in series between the first power supply and the second power supply. Further, it can be applied to the configuration shown as a modified example in the second embodiment.
  • FIG. 40 shows an example applied to the ring type power supply system 110.
  • the terminals 121, 122, and 123 are not shown for convenience.
  • two energization control devices 113a and 113b are arranged in series between the first power supply and the second power supply.
  • Two energization control devices 113c and 113d are arranged in series between the first power supply and the second power supply.
  • the energization control devices 113c and 113d are provided in parallel with the energization control devices 113a and 113b.
  • a region connected to the third terminal 123 of the energization control device 113a is referred to as a load region A.
  • a region connected to the third terminal 123 of the energization control device 113b is a load region B
  • a region connected to the third terminal 123 of the energization control device 113c is a load region C
  • a third terminal 123 of the energization control device 113d A region connected to the load region is referred to as a load region D.
  • the switch SW100 forcibly shutting off by the self-determination of the controller 150 is shown by overlaying a cross mark.
  • the switch SW102 of the energization control device 113a and the switch SW101 of the energization control device 113b are cut off. Further, the switch SW102 of the energization control device 113c and the switch SW101 of the energization control device 113d are cut off.
  • the load 116a is provided in the load area A, and the load 116b is provided in the load area D. In the disconnected state, the load 116a is connected to the first power system on the first power supply side, and the load 116b is connected to the second power system on the second power supply side.
  • the arrangement of the loads 116a and 116b is not limited to the above example.
  • the load 116a may be provided in the load region A or the load region C, and the load 116b may be provided in the load region B or the load region D.
  • the load 116a is provided in the load area A, and the load 116b is provided in the load area D. In the disconnected state, the load 116a is connected to the second power system on the second power supply side, and the load 116b is connected to the first power system on the first power supply side. Therefore, even if an abnormality occurs outside any of the terminals due to the disconnection of the switch SW100, the power supply to at least one of the loads 116a and 116b can be continued.
  • the arrangement of the loads 116a and 116b is not limited to the above example.
  • the load 116a may be provided in the load region A or the load region B, and the load 116b may be provided in the load region D or the load region C.
  • the switch SW100 may be configured by combining a normally-off type semiconductor element and a normally-on type semiconductor element.
  • the MOSFETs 141a and 142b are of normally-on type
  • the MOSFETs 141b and 142a are of normally-off type.
  • controllers 50 and 150 are realized by using ASIC.
  • a ground fault occurs inside the controllers 50 and 150, the power supply to the controllers 50 and 150 fails.
  • a shunt resistor 161 for detecting a current is provided on the path 135 that supplies power to the controller 150.
  • the controller 150 is configured to detect an overcurrent, that is, a ground fault, based on the voltage across the shunt resistor 161.
  • a switch 190 is provided on the path connecting the controller 150 and the external ground. When the controller 150 detects a ground fault, it forcibly turns off the switch 190 (off state). As a result, it is possible to immediately block the flow of the overcurrent due to the ground fault.
  • the controller 150 may output a diag signal to the ECU 105 when detecting a ground fault. It is also applicable to the controller 50.
  • the controller 150 detects the voltages of the terminals 121 and 122. When both of these terminal voltages drop, power is not supplied to the controller 150, as shown in FIG. In the momentary disconnection state, for example, the abnormality must be detected and cut off only by the charge of the capacitor built in the controller 150. Therefore, the monitoring time Tf may be switched according to the terminal voltage. Below, the voltage of the terminal 121 is shown as B1, and the voltage of the terminal 122 is shown as B2.
  • FIG. 43 shows an example in which an alarm (notification to the outside) is given together with the shutoff process, only the shutoff process may be executed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Keying Circuit Devices (AREA)
  • Protection Of Static Devices (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

L'invention porte sur un dispositif de commande de conduction (13) qui comprend : au moins trois bornes (121, 122, 123) connectées à l'extérieur ; des interrupteurs (SW100, SW101, SW102) qui sont disposés dans un chemin principal de courant électrique (130) connectant les différentes bornes, et qui basculent entre conduction et isolation entre les bornes ; et un dispositif de commande (150). Le dispositif de commande (150) détecte des courants circulant dans chaque interrupteur de la pluralité d'interrupteurs, et détermine si une surintensité accompagnant une anomalie est en train de circuler. Si le courant circulant dans au moins certains des interrupteurs est une surintensité, le dispositif de commande (150) met à l'état bloqué l'interrupteur connecté à la borne la plus proche de l'emplacement de l'anomalie, sur la base du sens dans lequel circule la surintensité.
PCT/JP2019/048219 2018-12-26 2019-12-10 Dispositif de commande de conduction et système d'alimentation électrique WO2020137507A1 (fr)

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JP2018243418A JP7017139B2 (ja) 2018-12-26 2018-12-26 通電制御装置及び電源システム

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
EP4084252A1 (fr) * 2021-04-30 2022-11-02 Yazaki Corporation Système d'alimentation électrique

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JP2023046805A (ja) 2021-09-24 2023-04-05 トヨタ自動車株式会社 電力供給回路、電力供給方法及びコンピュータプログラム
JP2023076787A (ja) * 2021-11-23 2023-06-02 株式会社デンソー 電源監視装置

Citations (2)

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Publication number Priority date Publication date Assignee Title
JP2004359169A (ja) * 2003-06-06 2004-12-24 Hitachi Ltd 電動ブレーキ装置
JP2017061240A (ja) * 2015-09-25 2017-03-30 株式会社オートネットワーク技術研究所 車載用電源装置及びその制御方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004359169A (ja) * 2003-06-06 2004-12-24 Hitachi Ltd 電動ブレーキ装置
JP2017061240A (ja) * 2015-09-25 2017-03-30 株式会社オートネットワーク技術研究所 車載用電源装置及びその制御方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4084252A1 (fr) * 2021-04-30 2022-11-02 Yazaki Corporation Système d'alimentation électrique
US11863012B2 (en) 2021-04-30 2024-01-02 Yazaki Corporation Power supply system

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