WO2020246415A1 - 車載電源システム - Google Patents

車載電源システム Download PDF

Info

Publication number
WO2020246415A1
WO2020246415A1 PCT/JP2020/021550 JP2020021550W WO2020246415A1 WO 2020246415 A1 WO2020246415 A1 WO 2020246415A1 JP 2020021550 W JP2020021550 W JP 2020021550W WO 2020246415 A1 WO2020246415 A1 WO 2020246415A1
Authority
WO
WIPO (PCT)
Prior art keywords
voltage
switch
control unit
conversion circuit
low
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2020/021550
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
田中　秀樹
毅 中屋敷
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Intellectual Property Management Co Ltd
Original Assignee
Panasonic Intellectual Property Management Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Panasonic Intellectual Property Management Co Ltd filed Critical Panasonic Intellectual Property Management Co Ltd
Priority to JP2021524830A priority Critical patent/JP7482354B2/ja
Priority to CN202080040186.7A priority patent/CN113924721B/zh
Priority to US17/607,024 priority patent/US12003176B2/en
Publication of WO2020246415A1 publication Critical patent/WO2020246415A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
    • H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
    • H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L1/00—Supplying electric power to auxiliary equipment of vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
    • B60L58/20—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules having different nominal voltages
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/40—Testing power supplies
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/36—Means for starting or stopping converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
    • H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
    • H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • H02M3/1582—Buck-boost converters

Definitions

  • the present invention relates to an in-vehicle power supply system used in various vehicles.
  • FIG. 3 is a circuit block diagram of a conventional vehicle-mounted power supply device 1.
  • the vehicle-mounted power supply device 1 has a converter 2, an input unit 3 of the vehicle-mounted power supply device 1 is connected to a battery 4, and an output unit 5 is connected to a battery 6. It is connected.
  • the control unit 7 is provided in the vehicle-mounted power supply device 1, and the control unit 7 detects the current and voltage of the input unit 3 and the output unit 5 and controls the operation of the converter 2 according to these detected values.
  • the control unit 7 determines that a failure has occurred in the in-vehicle power supply device 1, and is provided between the output unit 5 and the battery 6.
  • the switch 8 is shut off, and a warning signal is issued to the outside of the vehicle-mounted power supply device 1.
  • Patent Document 1 A conventional in-vehicle power supply device similar to the in-vehicle power supply device 1 is disclosed in, for example, Patent Document 1.
  • the in-vehicle power supply device includes a high-voltage DC power supply, a low-voltage storage battery, a DCDC converter, and a control unit.
  • the DCDC converter includes a conversion circuit having a high voltage end and a low voltage end, an input switch connected between the high voltage end and the high voltage DC power supply, and an output switch connected between the low voltage end and the low voltage storage battery.
  • the control unit detects that the current flowing through the conversion circuit exceeds the predetermined current threshold value or the charging voltage of the low voltage storage battery exceeds the predetermined voltage threshold value, the control unit stops the power conversion operation of the conversion circuit and turns on the input switch.
  • the control unit executes the failure determination of the DCDC converter in the cutoff state and after instructing the output switch to be in the cutoff state.
  • the control unit executes the first determination operation of performing the output short-circuit failure determination, the output open failure determination, and the input short-circuit failure determination.
  • the control unit executes a second determination operation for determining whether or not the conversion circuit has failed.
  • the control unit executes a third determination operation of performing an input open failure determination for determining whether or not the input switch has failed.
  • This in-vehicle power supply device can easily determine the location of failure.
  • FIG. 1 is a circuit block diagram of an in-vehicle power supply system according to an embodiment.
  • FIG. 2 is a circuit block diagram of an in-vehicle power supply system according to the embodiment.
  • FIG. 3 is a circuit block diagram of a conventional in-vehicle power supply device.
  • FIG. 1 is a circuit block diagram of the vehicle-mounted power supply system 11 according to the embodiment.
  • the in-vehicle power supply system 11 includes a high-voltage DC power supply 12, a low-voltage storage battery 13, a DCDC converter 14, and a control unit 15.
  • the DCDC converter 14 is connected to the high voltage DC power supply 12 and the low voltage storage battery 13 between the high voltage DC power supply 12 and the low voltage storage battery 13.
  • the DCDC converter 14 includes an input switch 16 connected in series from a high-voltage DC power supply 12 to a low-voltage storage battery 13, a conversion circuit 17 capable of bidirectional operation, and an output switch 18, and further includes a current detector. Includes 19.
  • the high-voltage end 17A of the conversion circuit 17 is connected to the input switch 16, and the low-voltage end 17B of the conversion circuit 17 is connected to the output switch 18.
  • the input switch 16 has one end connected to the high-voltage DC power supply 12 and the other end, and has a connection state for connecting between one end and the other end and a cutoff state for cutting off between one end and the other end. It is configured to be selective with and.
  • the conversion circuit 17 has a high voltage end 17A and a low voltage end 17B connected to the other end of the input switch 16, and has a boosting operation of boosting the voltage of the low voltage end 17B to obtain the voltage of the high voltage end 17A and a high voltage. Bidirectional operation is possible in which the voltage at the end 17A is stepped down to obtain the voltage at the low voltage end 17B.
  • the output switch 18 has one end connected to the low voltage end 17B of the conversion circuit 17 and the other end connected to the low voltage storage battery 13, and has a connection state connecting one end and the other end and one end. It is configured to be selectively in a cutoff state that cuts off the gap with the other end.
  • the control unit 15 monitors the current flowing through the conversion circuit 17 in the DCDC converter 14 detected by the current detector 19 and the charging voltage in the low-voltage storage battery 13. The control unit 15 further controls the operation of the DCDC converter 14 based on the values of the current flowing through the conversion circuit 17 and the charging voltage in the low-voltage storage battery 13.
  • control unit 15 When the control unit 15 detects that the current flowing through the conversion circuit 17 exceeds the predetermined current threshold value or the charging voltage of the low voltage storage battery 13 exceeds the predetermined voltage threshold value, the control unit 15 performs the power conversion operation of the conversion circuit 17. It is instructed to stop and to shut off the input switch 16 and the output switch 18. After that, the control unit 15 executes a failure determination of the DCDC converter 14.
  • the failure determination operation includes the first determination operation, the second determination operation, and the third determination operation described below.
  • the control unit 15 detects the low voltage value VL1 at the low voltage end 17B of the conversion circuit 17 while the control unit 15 instructs the output switch 18 to be in the cutoff state. Based on the low voltage value VL1, the control unit 15 determines whether the output switch 18 continues to be short-circuited and fails due to a short circuit, or whether it is in a normal state where it can be cut off. ..
  • control unit 15 instructs the output switch 18 to be connected. After that, the control unit 15 detects the low voltage value VL2 at the low voltage end 17B of the conversion circuit 17. Based on the low voltage value VL2, the control unit 15 determines whether the output switch 18 keeps shutting off, that is, keeps opening and fails due to opening, or whether it is in a normal state where it can be connected. I do.
  • control unit 15 detects the high voltage value VH1 at the high voltage end 17A of the conversion circuit 17 in a state in which the input switch 16 is instructed to be in the cutoff state.
  • the high voltage value VH1 can be obtained by detecting the voltage on the high potential side of the input capacitor 20. Based on the high voltage value VH1, the control unit 15 determines whether the input switch 16 is continuously short-circuited and is in a short-circuited failure state, or is in a normal state in which it can be cut off.
  • the control unit 15 determines that the input switch 16 has failed due to a short circuit, and the high voltage value VH1 is high. If it is lower than the voltage threshold VTH1, the control unit 15 determines that the input switch 16 is normal and has not failed.
  • the high voltage threshold VTH1 is set in the range of about 1/10 to 1/2 of the reference voltage value of the high voltage DC power supply 12, and the contact resistance of the input switch 16 when the input switch 16 fails due to a short circuit. It is set as a value that can correctly detect a failure even if a voltage drop occurs.
  • the voltage of the high-voltage end 17A by the control unit 15 is such that the control unit 15 detects the voltage of the input capacitor 20 connected to the connection point between the conversion circuit 17 and the input switch 16 and the ground GND. You may get it at.
  • an input short-circuit failure determination for determining a failure due to a short circuit of the input switch 16 is performed, and then an output short-circuit failure determination for determining a failure due to a short circuit of the output switch 18 is performed. After that, it is preferable that an output open failure determination for determining a failure due to the opening of the output switch 18 is performed. Alternatively, even if the failure determination is first performed by short-circuiting the output switch 18, then the failure determination is performed by short-circuiting the input switch 16, and then the failure determination is performed by opening the output switch 18. Good.
  • the control unit 15 instructs the switch to be connected to the failure detection operation in the subsequent failure determination operation, so that the overcurrent is energized to the switch. It can be prevented in advance. As a result, the occurrence of secondary failures associated with the failure determination is suppressed.
  • the second determination operation is performed.
  • the second determination operation is normal because the output switch 18 did not fail due to a short circuit, the open did not fail, and the input switch 16 did not fail due to a short circuit in the first determination operation performed earlier.
  • the control unit 15 determines that the control unit 15 is in a controllable state, the first determination operation is continued.
  • the control unit 15 first instructs the output switch 18 to be in the connected state.
  • the control unit 15 controls the conversion circuit 17 so as to boost the voltage at the low voltage end 17B of the conversion circuit 17. In that state, the control unit 15 detects the high voltage value VH2 at the high voltage end 17A of the conversion circuit 17.
  • the control unit 15 determines whether or not the conversion circuit 17 can normally execute the boosting operation based on the high voltage value VH2 and the conversion circuit 17 is out of order.
  • the third judgment operation is performed.
  • the third determination operation is continuously performed in the second determination operation when the control unit 15 determines that the conversion circuit 17 can execute the boosting operation and has not failed in the second determination operation previously executed.
  • the control unit 15 first controls the conversion circuit 17 so as not to boost the voltage. In that state, the control unit 15 instructs the input switch 16 to be connected. Further, the control unit 15 detects the high voltage value VH3 of the high voltage end 17A of the conversion circuit 17. Based on the high voltage value VH3, the control unit 15 determines whether the input switch 16 is in a state of failure due to opening or a normal state in which it can be connected.
  • the part causing the failure in the DCDC converter 14 can be easily and accurately identified.
  • the in-vehicle power supply system 11 it is desirable to perform a short-circuit failure determination, then perform a failure determination of the input switch 16 on the high voltage side, and then sequentially perform a failure determination on the low voltage side.
  • the second determination operation may be performed during the first determination operation.
  • FIG. 2 is a circuit block diagram of the vehicle-mounted power supply system 11 according to the embodiment.
  • the in-vehicle power supply system 11 is mounted on the vehicle body 22 of the vehicle 21.
  • the high-voltage DC power supply 12 may be composed of only a storage battery 12A such as a lithium-ion battery having a DC voltage of 48V, or may be composed of a storage battery 12A and a power generation system 23 connected in parallel to the storage battery 12A.
  • the power generation system 23 is composed of, for example, an alternator and a rectifier circuit.
  • the low-voltage storage battery 13 is a lead-acid battery having a DC voltage of, for example, 12 V, which is lower than the voltage of the high-voltage DC power supply 12, and the low-voltage storage battery 13 is driven by the power of the high-voltage DC power supply 12 during normal driving of the vehicle 21. It will be charged.
  • the DCDC converter 14 is connected between the high voltage DC power supply 12 and the low voltage storage battery 13.
  • the DCDC converter 14 includes an input switch 16 connected in series from a high-voltage DC power supply 12 to a low-voltage storage battery 13, a conversion circuit 17 capable of bidirectional operation, an output switch 18, and a current detector 19. ..
  • the input switch 16 and the output switch 18 may be semiconductor switches such as FETs (field effect transistors) and IGBTs (insulated gate bipolar transistors), or relay switches having mechanical contacts.
  • the conversion circuit 17 has a step-down operation for stepping down the high voltage of the high-voltage DC power supply 12 to the low voltage of the low-voltage storage battery 13 and a step-up operation for stepping up the low voltage of the low-voltage storage battery 13 to the high voltage of the high-voltage DC power supply 12. It is a bidirectional converter capable of both operation and operation.
  • the conversion circuit 17 has a high-side switch 24, a choke coil 25, a low-side switch 26, and a smoothing capacitor 27.
  • the high side switch 24 and the choke coil 25 are connected in series from the high voltage end 17A of the conversion circuit 17 to the low voltage end 17B in this order.
  • the low side switch 26 is connected to the connection point 17P between the high side switch 24 and the choke coil 25 and the ground GND.
  • the smoothing capacitor 27 is connected to the low voltage end 17B and the ground GND.
  • the high side switch 24 has one end connected to the other end of the input switch 16 and the other end.
  • the choke coil 25 has one end connected to the other end of the output switch 18, and the other end connected to the other end of the high side switch 24 at the connection point 17P.
  • the low side switch 26 has one end connected to the connection point 17P and the other end connected to the ground GND.
  • the high-side switch 24 and the low-side switch 26 are controlled by the control unit 15 to perform a synchronous rectification operation, so that a step-up operation and a step-down operation can be performed.
  • the resistor 28 having a high resistance value is connected to the low voltage end 17B of the conversion circuit 17 and the ground GND. That is, the resistor 28 has one end connected to the low voltage end 17B of the conversion circuit 17 and the other end connected to the ground GND.
  • the resistor 28 is mainly used for detecting the voltage at the low voltage end 17B.
  • the current detector 19 detects the current flowing through the conversion circuit 17.
  • the control unit 15 monitors the current detected by the current detector 19 and the charging voltage that is the voltage across the low-voltage storage battery 13 and charges the low-voltage storage battery 13.
  • the control unit 15 further controls the DCDC converter 14 based on the current flowing through the conversion circuit 17 and the charging voltage in the low-voltage storage battery 13. This operation of the control unit 15 is an operation when the vehicle 21 is driven, such as during normal traveling.
  • the current detector 19 is arranged at the input switch 16 of the high side switch 24 and detects the current flowing through the high side switch 24, but may be arranged so as to detect the current flowing through the low side switch 26. .. Alternatively, the current flowing through the choke coil 25 may be detected by being arranged at one end or the other end of the choke coil 25. Further, the current detectors 19 may be arranged at the plurality of locations in order to detect the plurality of currents. Here, the current detector 19 detects the current in the DCDC converter 14, but may detect the current flowing through the low-voltage storage battery 13.
  • control unit 15 When the control unit 15 detects that the current flowing through the conversion circuit 17 or the charging voltage in the low-voltage storage battery 13 exceeds a predetermined threshold value, the control unit 15 switches the input switch 16, the output switch 18, the high-side switch 24, and the low-side switch 26. Instruct to keep shutting off. As a result, at least measures are taken to ensure safety from abnormalities due to short-circuit current. After that, the control unit 15 executes a failure determination operation for determining a failure of the DCDC converter 14. The failure determination operation may be performed while the vehicle 21 is running, or immediately after the vehicle 21 is activated by the start switch.
  • the control unit 15 detects the low voltage value VL1 at the low voltage end 17B of the conversion circuit 17. Based on the low voltage value VL1, the control unit 15 determines whether the output switch 18 is in a short-circuit failure state in which the output switch 18 continues to be short-circuited and fails due to a short circuit, or whether it is in a normal state in which it can be cut off. ..
  • the control unit 15 determines that the output switch 18 is normal.
  • the low voltage threshold VTL1 is set in the range of about one tenth to one half of the reference voltage value of the low voltage storage battery 13, and when the output switch 18 is short-circuited, the voltage drop is caused by the contact resistance of the output switch 18. Set the value so that the failure can be detected correctly even if it occurs.
  • the control unit 15 detects the voltage across the output switch 18, and if the potential difference between the ends of the output switch 18 is smaller than the threshold value, the control unit 15 determines that the output switch 18 has failed due to a short circuit. If the potential difference is larger than the threshold value, the control unit 15 may determine that the output switch 18 is normal and has not failed. For example, if the output switch 18 fails due to a short circuit, the resistance between both ends of the output switch 18 is almost zero, so that the potential difference is substantially zero. If the output switch 18 is normally shut off in response to the above-mentioned instruction of the control unit 15, a potential difference occurs between the low-voltage storage battery 13 and the grounded resistor 28 at both ends of the output switch 18. Therefore, the threshold value here can be set in the range of about 0.1 V to 1.0 V.
  • the control unit 15 further instructs the output switch 18 to be in the connected state.
  • the control unit 15 detects the low voltage value VL2 at the low voltage end 17B of the conversion circuit 17. Based on the low voltage value VL2, the control unit 15 determines whether the output switch 18 is in a cutoff state, that is, whether the output switch 18 is continuously opened and fails due to opening, or whether it can be connected normally.
  • the control unit 15 determines that the output switch 18 is open and has failed, and the low voltage value.
  • VL2 is higher than the low voltage threshold voltage VTL2
  • the control unit 15 determines that the output switch 18 is normal and has not failed.
  • the low voltage threshold VTL2 is the lower limit of the normal fluctuation range of the low voltage storage battery 13, such as a value about 1 V lower than the reference value of the low voltage storage battery 13 or a value about 10% lower than the reference value of the low voltage storage battery 13.
  • the value may be set as a guide.
  • the control unit 15 detects the voltage across the output switch 18, and if the potential difference between both ends of the output switch 18 is larger than the threshold value, the control unit 15 determines that the output switch 18 is open and has failed. When the potential difference is smaller than the threshold value, the control unit 15 may determine that the output switch 18 is normal and has not failed. For example, when the output switch 18 is open and malfunctions, a potential difference is generated between the low voltage storage battery 13 and the grounded resistor 28 at both ends of the output switch 18. On the other hand, if the output switch 18 can be normally connected, the resistance between both ends of the output switch 18 is almost zero, so that no potential difference occurs and the output switch 18 is substantially zero. Therefore, the threshold value here can be set in the range of about 0.5V to 1.0V.
  • the control unit 15 further detects the high voltage value VH1 at the high voltage end 17A of the conversion circuit 17. Based on the high voltage value VH1, the control unit 15 determines whether the input switch 16 is in a connected state, that is, whether the input switch 16 continues to be short-circuited and fails due to a short circuit, or whether it is in a normal state where it can be cut off. At this time, since the conversion circuit 17 is stopped, power is not supplied to the input switch 16 from the conversion circuit 17. If the input switch 16 is normally shut off in response to the above-mentioned instruction of the control unit 15, the voltage from the high voltage DC power supply 12 through the input switch 16 is not applied to the high voltage end 17A.
  • the input short-circuit failure determination of the input switch 16 is first performed, and then the input short-circuit failure determination is performed. It is desirable that the output short-circuit failure determination of the output switch 18 is performed, and then the output open failure determination of the output switch 18 is performed. Alternatively, the output short-circuit failure determination of the output switch 18 may be first performed, then the input short-circuit failure determination of the input switch 16 may be performed, and then the output open failure determination of the output switch 18 may be performed.
  • the control unit 15 instructs the switch to be connected to the switch that detects the failure in the subsequent failure determination operation. It is possible to prevent an overcurrent from flowing. As a result, the occurrence of secondary failures associated with the failure determination is suppressed. The secondary failure is more effectively suppressed, in particular, when the input short-circuit failure determination of the input switch 16 is executed first before the output short-circuit failure determination of the output switch 18.
  • the control unit 15 In the first determination operation, the above-mentioned input short-circuit failure determination, output short-circuit failure determination, and output release failure determination are performed by the control unit 15, and the input switch 16 is used in the input short-circuit failure determination, output short-circuit failure determination, and output open failure determination.
  • the control unit 15 executes the second determination operation described later. Further, when it is determined that either the input switch 16 or the output switch 18 is out of order in these determinations, it is determined that the DCDC converter 14 is out of order, and the failed switch is identified. The control unit 15 keeps the DCDC converter 14 stopped. Further, the control unit 15 transmits a warning signal notifying the failure to the vehicle control unit arranged on the vehicle body 22.
  • the control unit 15 is instructed to shut off the low side switch 26. Then, in the limited short period PT1, the output switch 18 determined to be normal in the first determination operation is put into the connected state, and is put into the cutoff state after the elapse of the period PT1.
  • the low-side switch 26 can be normally cut off in response to the instruction from the control unit 15, the voltage charged to the smoothing capacitor 27 in the period PT1 is further cut off by the output switch 18 after the period PT1 ends. It is continuously maintained even after the period PT2 has elapsed.
  • the low-side switch 26 cannot be normally shut off in response to the instruction from the control unit 15 and fails due to a short circuit, the period after the period PT1 is completed and the low-side switch 26 is further instructed to be shut off. After PT2 has elapsed, the voltage charged to the smoothing capacitor 27 during the period PT1 becomes almost zero because it is discharged to the ground GND through the short-circuited low-side switch 26.
  • the control unit 15 shuts off the output switch 18.
  • the control unit 15 detects the state of charge of the smoothing capacitor 27 after the period PT2 has elapsed from the interruption of the output switch 18 by the voltage across the resistor 28. If this voltage is lower than the predetermined voltage, the control unit 15 determines that the low-side switch 26 has failed due to a short circuit, and if this voltage is equal to or higher than the predetermined voltage, it controls that the low-side switch 26 has not failed due to a short circuit. Unit 15 can determine.
  • the second judgment operation is performed after the first judgment operation.
  • the control unit 15 determines that the output switch 18 has not failed even if it is short-circuited or opened, and the control unit 15 can normally control the output switch 18, and the input switch.
  • the control unit 15 executes the second determination operation following the first determination operation.
  • the control unit 15 first instructs the output switch 18 to be connected. Further, the control unit 15 instructs a conversion circuit 17 that performs a boosting operation that boosts the voltage at the low voltage end 17B of the conversion circuit 17 and outputs the voltage to the high voltage end 17A. Then, the control unit 15 detects the high voltage value VH2 that appears at the high voltage end 17A of the conversion circuit 17 and is obtained by the boosting operation. The high voltage value VH2 can be obtained by detecting the voltage on the high potential side of the input capacitor 20. The control unit 15 determines whether or not the conversion circuit 17 can normally perform the boosting operation based on the high voltage value VH2 and the conversion circuit 17 is out of order.
  • the high voltage threshold value VTH2 is set to a value about 1 V higher than the reference value of the high voltage DC power supply 12 or a value about 10% higher than the reference value of the high voltage DC power supply 12.
  • the control unit 15 executes the determination operation described later.
  • the control unit 15 determines that the DCDC converter 14 is defective, and the failed portion is identified as the conversion circuit 17. Further, the control unit 15 transmits a warning signal regarding the failure to the vehicle control unit arranged on the vehicle body 22.
  • the control unit 15 is in the connected state of the output switch 18.
  • the high-side switch 24 of the conversion circuit 17 is a MOSFET having a parasitic diode capable of constantly energizing from the output switch 18 to the input switch 16, or from the output switch 18 in parallel with the high-side switch 24.
  • the high side diode 24A that can always be energized in the direction of the input switch 16 is provided, when the output switch 18 is connected, a large current flows from the low voltage storage battery 13 to the input capacitor 20 in a short time.
  • control unit 15 before the control unit 15 continuously connects the output switch 18 in the second determination operation, the control unit 15 operates the output switch 18 as a switching element of the step-down switching converter to obtain the voltage of the input capacitor 20.
  • the input capacitor 20 may be charged so that is a predetermined value.
  • the high-side switch 24 connected to the input switch 16 is connected in series with the choke coil 25 connected to the output switch 18.
  • the low side switch 26 is connected to the connection point 17P between the high side switch 24 and the choke coil 25 and the ground.
  • a high-side diode 24A having a cathode connected to the input switch 16 is connected in parallel to the high-side switch 24.
  • the cathode of the converter diode 29 is connected to the low voltage end 17B of the conversion circuit 17, and the anode is connected to the ground GND.
  • the input capacitor 20 is connected to the high voltage end 17A of the conversion circuit 17 and the ground GND.
  • the control unit 15 executes the second determination operation.
  • the control unit 15 drives the output switch 18 with a PWM signal or the like to periodically turn it on and off to perform switching control, thereby converting the choke coil 25, the converter diode 29, and the output switch 18 into a buck converter. Operate as. By this converter operation, a voltage lower than the voltage of the low voltage end 17B is generated at the connection point 17P, and the control unit 15 charges the input capacitor 20 via the high side diode 24A until the voltage across the input capacitor 20 reaches a predetermined value. To do. After that, the control unit 15 ends the converter operation and ends the charging of the input capacitor 20.
  • control unit 15 instructs the output switch 18 to be continuously connected, and further, the control unit 15 instructs the conversion circuit 17 to perform a boosting operation to boost the voltage at the low voltage end 17B.
  • the high voltage value VH2 at the high voltage end 17A of the conversion circuit 17 is detected, and it is determined whether or not the conversion circuit 17 has failed based on the high voltage value VH2.
  • the determination of the failure of the conversion circuit 17 based on the high voltage value VH2 is the same as the second determination operation, and the description thereof will be omitted.
  • the output switch 18 uses a semiconductor switch such as an FET (field effect transistor) or an IGBT (insulated gate bipolar transistor), so that the control unit 15 controls the switching operation.
  • the control unit 15 performs the third determination operation after the second determination operation.
  • the control unit 15 determines that the conversion circuit 17 is capable of boosting operation and has not failed, the control unit 15 continues to the second determination operation.
  • the third determination operation is executed.
  • control unit 15 first instructs not to boost the conversion circuit 17.
  • control unit 15 instructs the input switch 16 which has been instructed to be in the cutoff state to be connected. After that, the control unit 15 detects the high voltage value VH3 at the high voltage end 17A of the conversion circuit 17.
  • the high voltage value VH3 can be obtained by detecting the voltage on the high potential side of the input capacitor 20. Based on the high voltage value VH3, the control unit 15 determines whether the input switch 16 continues to be open and fails due to opening, or whether the input switch 16 is in a state where it can be connected normally.
  • the conversion circuit 17 is stopped, and power is not supplied to the input switch 16 from the conversion circuit 17. Then, if the input switch 16 can be normally connected according to the instruction of the control unit 15, the voltage from the high voltage DC power supply 12 through the input switch 16 is applied to the high voltage end 17A in the connected state. Will be done. Therefore, when the high voltage value VH3 of the high voltage end 17A of the conversion circuit 17 is lower than the high voltage threshold value VTH3, the control unit 15 determines that the output switch 18 is open and has failed, and the high voltage value VH3 is the high voltage threshold value. If it is higher than VTH3, the control unit 15 determines that the input switch 16 is normal and has not failed.
  • the high voltage threshold value VTH3 is set using the lower limit of the normal fluctuation range of the high voltage DC power supply 12, such as a value about 10% lower than the reference voltage value of the high voltage DC power supply 12, as a guide.
  • the control unit 15 detects the voltage of the high-voltage end 17A of the conversion circuit 17 by the control unit 15 and the voltage of the input capacitor 20 connected to the high-voltage end 17A of the conversion circuit 17 and the ground GND. You may get it by doing.
  • the control unit 15 determines whether or not the input switch 16 is open and malfunctioning. If it is determined that the input switch 16 is normal without failure, all determinations are terminated. Further, when it is determined that the input switch 16 is open and failed, the control unit 15 determines that the DCDC converter 14 is failed, causes the DCDC converter 14 to continue in the stopped state, and inputs the failed part. Identify as switch 16. Further, the control unit 15 transmits a warning signal regarding the failure to the vehicle control unit arranged on the vehicle body 22.
  • the failure is determined from the input switch 16 on the high voltage side, and the determination is sequentially advanced to the low voltage side.
  • the voltage is transferred to the conversion circuit 17 and the output switch 18. Not applied.
  • the conversion circuit 17 and the input switch 16 are determined to be normal before that.
  • the voltage can be appropriately set for the conversion circuit 17 and the output switch 18 especially during the failure determination operation for the output switch 18, so that it is possible to prevent the induction of a secondary failure.
  • the withstand voltage of the output switch 18 does not need to be increased in consideration of failure determination.
  • the input switch 16 when the input switch 16 is composed of a semiconductor switch, it is desirable that the input switch 16 has two semiconductor switches connected in series so that the parasitic diodes are in opposite directions.
  • In-vehicle power supply system 12 High-voltage DC power supply 12A Storage battery 13 Low-voltage storage battery 14 DCDC converter 15 Control unit 16 Input switch 17 Conversion circuit 17A High-voltage end 17B Low-voltage end 18 Output switch 19 Current detector 20 Input capacitor 21 Vehicle 22 Body 23 Power generation system 24 High-side switch 24A High-side diode 25 Chalk coil 26 Low-side switch 27 Smoothing capacitor 28 Resistance 29 Converter diode

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Dc-Dc Converters (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
PCT/JP2020/021550 2019-06-07 2020-06-01 車載電源システム Ceased WO2020246415A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2021524830A JP7482354B2 (ja) 2019-06-07 2020-06-01 車載電源システム
CN202080040186.7A CN113924721B (zh) 2019-06-07 2020-06-01 车载电源系统
US17/607,024 US12003176B2 (en) 2019-06-07 2020-06-01 In-vehicle power supply system to detect failure for a bi-directional DC-DC converter's conversion circuit

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019-106606 2019-06-07
JP2019106606 2019-06-07

Publications (1)

Publication Number Publication Date
WO2020246415A1 true WO2020246415A1 (ja) 2020-12-10

Family

ID=73652527

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2020/021550 Ceased WO2020246415A1 (ja) 2019-06-07 2020-06-01 車載電源システム

Country Status (4)

Country Link
US (1) US12003176B2 (https=)
JP (1) JP7482354B2 (https=)
CN (1) CN113924721B (https=)
WO (1) WO2020246415A1 (https=)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112721641A (zh) * 2020-12-17 2021-04-30 联合汽车电子有限公司 汽车电压变换器的故障诊断方法及故障诊断装置
CN114371423A (zh) * 2021-09-30 2022-04-19 华为数字能源技术有限公司 一种检测方法、装置、变换器和车辆
CN114938137A (zh) * 2022-03-23 2022-08-23 联合汽车电子有限公司 用于冗余dc/dc半桥短路的识别电路、dc/dc、车辆、方法及介质
JP2023098193A (ja) * 2021-12-28 2023-07-10 株式会社椿本チエイン 給電装置及び給電システム
EP4535600A4 (en) * 2022-05-27 2025-09-17 Panasonic Ip Man Co Ltd POWER SUPPLY DEVICE AND SWITCH DIAGNOSTIC METHOD

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4020735A1 (en) * 2020-12-22 2022-06-29 Volvo Car Corporation Converter system for transferring power
US11545887B2 (en) * 2021-04-16 2023-01-03 Infineon Technologies Ag Safety cutoff circuit for power converter
KR20230015763A (ko) * 2021-07-23 2023-01-31 현대자동차주식회사 전기차량의 양방향 obc 제어 장치 및 그 방법
WO2024209397A1 (en) * 2023-04-05 2024-10-10 Bombardier Recreational Products Inc. System for managing a charging state of an auxiliary battery and vehicle including the system
CN118849829A (zh) * 2023-04-26 2024-10-29 上海理想汽车科技有限公司 一种充电控制电路、方法及车辆
CN116476642A (zh) * 2023-04-27 2023-07-25 重庆长安汽车股份有限公司 一种汽车dcdc架构短路故障的判定方法、装置及车辆
CN116620029A (zh) * 2023-06-29 2023-08-22 重庆赛力斯新能源汽车设计院有限公司 车辆低压供电系统异常的提示方法及装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017212805A (ja) * 2016-05-25 2017-11-30 株式会社オートネットワーク技術研究所 車両用電圧変換装置
JP2018061438A (ja) * 2018-01-23 2018-04-12 株式会社オートネットワーク技術研究所 Ｄｃｄｃコンバータ
KR20190001587A (ko) * 2018-11-08 2019-01-04 주식회사 경신 양방향 컨버터의 스위치 고장 판단 장치 및 방법

Family Cites Families (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10346325A1 (de) * 2003-10-06 2005-05-04 Siemens Ag Schaltvorrichtung zum bidirektionalen Ladungsausgleich zwischen Energiespeichern
JP4356476B2 (ja) * 2004-02-24 2009-11-04 トヨタ自動車株式会社 電圧変換装置、電圧変換装置の故障の判定方法、およびその方法をコンピュータに実行させるためのプログラムを記録したコンピュータ読取可能な記録媒体
JP4149415B2 (ja) * 2004-05-31 2008-09-10 株式会社ケーヒン 昇圧電源制御装置および昇圧電源制御装置の故障部位特定判定方法
JP2007202290A (ja) 2006-01-26 2007-08-09 Fujitsu Ten Ltd 直流電源装置
JP5326421B2 (ja) * 2008-08-18 2013-10-30 富士電機株式会社 Ｄｃ−ｄｃコンバータの異常電流防止回路
JP5414818B2 (ja) * 2012-02-23 2014-02-12 三菱電機株式会社 電気自動車用電力変換装置
US9246383B2 (en) * 2012-10-05 2016-01-26 Linear Technology Corporation System and method for input voltage regulation of switch mode supplies implementing burst mode operation
JP2014128183A (ja) * 2012-12-27 2014-07-07 Toyota Motor Corp Ｄｃ−ｄｃコンバータの異常判定装置及び異常判定方法
CN103066666B (zh) * 2013-01-22 2015-08-26 矽力杰半导体技术(杭州)有限公司 一种升压型电池充电管理系统及其控制方法
EP2955805B1 (en) * 2013-02-05 2017-04-05 Mitsubishi Electric Corporation Power converter and power conversion method
CN104377827B (zh) * 2014-11-21 2017-03-01 南车株洲电力机车研究所有限公司 一种光伏直流电源
US9364512B1 (en) * 2015-02-08 2016-06-14 Halister Joseph Drummond, III Aloe vera based vaping compositions
ITUB20151055A1 (it) * 2015-05-27 2016-11-27 St Microelectronics Srl Dispositivo e metodo di controllo di un convertitore di tensione e relativo convertitore di tensione
US9972998B2 (en) * 2015-06-08 2018-05-15 Dialog Semiconductor (Uk) Limited Short circuit self-protected DC-to-DC buck converters
WO2017133400A2 (zh) * 2016-02-05 2017-08-10 广东欧珀移动通信有限公司 适配器和充电控制方法
DE112016006573T5 (de) * 2016-04-15 2018-11-22 Mitsubishi Electric Corporation Bordeigene Ladevorrichtung
US10574138B2 (en) * 2017-10-03 2020-02-25 Delta Electronics, Inc. Power converter, power converting system, and power converter control method
KR102518543B1 (ko) * 2017-12-07 2023-04-07 현대자동차주식회사 사용자의 발화 에러 보정 장치 및 그 방법
CN107947371A (zh) * 2017-12-20 2018-04-20 福州金掌柜电子商务有限公司 一种基于卫星通信的线路检测故障快速定位检测系统
CN109256951B (zh) * 2018-09-29 2020-07-28 南京南瑞继保电气有限公司 一种直流电压变换装置及其控制方法
US10778099B1 (en) * 2019-07-23 2020-09-15 Texas Instruments Incorporated Boost-back protection for power converter
US11538478B2 (en) * 2020-12-07 2022-12-27 Amazon Technologies, Inc. Multiple virtual assistants
KR102895227B1 (ko) * 2020-12-15 2025-12-05 현대모비스 주식회사 양방향 절연형 dc-dc 컨버터 및 그 제어장치와 운용방법

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017212805A (ja) * 2016-05-25 2017-11-30 株式会社オートネットワーク技術研究所 車両用電圧変換装置
JP2018061438A (ja) * 2018-01-23 2018-04-12 株式会社オートネットワーク技術研究所 Ｄｃｄｃコンバータ
KR20190001587A (ko) * 2018-11-08 2019-01-04 주식회사 경신 양방향 컨버터의 스위치 고장 판단 장치 및 방법

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112721641A (zh) * 2020-12-17 2021-04-30 联合汽车电子有限公司 汽车电压变换器的故障诊断方法及故障诊断装置
CN114371423A (zh) * 2021-09-30 2022-04-19 华为数字能源技术有限公司 一种检测方法、装置、变换器和车辆
JP2023098193A (ja) * 2021-12-28 2023-07-10 株式会社椿本チエイン 給電装置及び給電システム
JP7823389B2 (ja) 2021-12-28 2026-03-04 株式会社椿本チエイン 給電装置及び給電システム
CN114938137A (zh) * 2022-03-23 2022-08-23 联合汽车电子有限公司 用于冗余dc/dc半桥短路的识别电路、dc/dc、车辆、方法及介质
EP4535600A4 (en) * 2022-05-27 2025-09-17 Panasonic Ip Man Co Ltd POWER SUPPLY DEVICE AND SWITCH DIAGNOSTIC METHOD

Also Published As

Publication number Publication date
US20220216791A1 (en) 2022-07-07
CN113924721B (zh) 2023-08-25
JP7482354B2 (ja) 2024-05-14
CN113924721A (zh) 2022-01-11
JPWO2020246415A1 (https=) 2020-12-10
US12003176B2 (en) 2024-06-04

Similar Documents

Publication Publication Date Title
WO2020246415A1 (ja) 車載電源システム
US10710468B2 (en) Vehicle power supply device
US10749217B2 (en) Power source device
US10800360B2 (en) Electric power system of vehicle with quick discharge of a high-voltage condenser
US10787136B2 (en) Electric power system for controlling pre-charge of vehicle
US10601301B2 (en) Abnormality detection device and vehicle-mounted power supply device
US20150097501A1 (en) Electric vehicle power conversion system
US20110234176A1 (en) Discharge control apparatus
KR102772504B1 (ko) 무선 전력 전송 시스템을 위한 보조 전력 드롭아웃 보호
US8687327B2 (en) Electronic system for converting DC voltage into AC voltage
JPWO2020246415A5 (https=)
US9843184B2 (en) Voltage conversion apparatus
US11201460B2 (en) Power source switch control device
JP2010172100A (ja) 昇降圧コンバータ
WO2018180753A1 (ja) 電源装置
CN116073332B (zh) 开关保护电路及电动汽车
US11476750B2 (en) Vehicle power supply device with charge circuit section
JP2021164286A (ja) 電源回路、電源供給方法
WO2020189138A1 (ja) 車載電源システム
JP7420032B2 (ja) 過電流検出装置
JP2013132128A (ja) 電力変換器の絶縁不良検出装置および電力変換器並びに絶縁不良検出装置
WO2022131121A1 (ja) 電力変換装置
US20250258228A1 (en) Power supply device and switch diagnosis method
WO2024105905A1 (ja) 給電制御装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20818967

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2021524830

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 20818967

Country of ref document: EP

Kind code of ref document: A1