WO2023228508A1 - 電源装置およびスイッチの診断方法 - Google Patents

電源装置およびスイッチの診断方法 Download PDF

Info

Publication number
WO2023228508A1
WO2023228508A1 PCT/JP2023/008224 JP2023008224W WO2023228508A1 WO 2023228508 A1 WO2023228508 A1 WO 2023228508A1 JP 2023008224 W JP2023008224 W JP 2023008224W WO 2023228508 A1 WO2023228508 A1 WO 2023228508A1
Authority
WO
WIPO (PCT)
Prior art keywords
power supply
switch
voltage
converter
dcdc converter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2023/008224
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
賢祐 竹本
幸司 吉田
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 CN202380041683.2A priority Critical patent/CN119301836A/zh
Priority to JP2024522919A priority patent/JPWO2023228508A1/ja
Priority to EP23811389.8A priority patent/EP4535600A4/en
Priority to US18/857,519 priority patent/US20250258228A1/en
Publication of WO2023228508A1 publication Critical patent/WO2023228508A1/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
    • 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
    • G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering
    • H02J7/342—The other DC source being a battery actively interacting with the first one, i.e. battery to battery charging
    • 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
    • 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
    • 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
    • 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
    • H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
    • H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
    • H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
    • H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H02M1/322—Means for rapidly discharging a capacitor of the converter for protecting electrical components or for preventing electrical shock

Definitions

  • the present disclosure relates to a power supply device connected between two DC power supplies and a method of diagnosing a switch included in the power supply device.
  • a power supply device that is connected between two DC power supplies (a first DC power supply and a second DC power supply) to convert power, it converts the voltage on the input side (that is, the first DC power supply) to a desired voltage, and outputs the voltage.
  • a DC/DC converter that outputs (that is, charges) to the second DC power source (that is, the second DC power supply) may be provided.
  • such a power supply device has a switch connected to or disconnected from the input side components and the DC/DC converter, and a switch connected to or disconnected from the output side components and the DC/DC converter at both ends. Provided for the protection of two components. Especially when it comes to shutting off a switch, it can be determined whether the switch can be shut off (in other words, the switch is normal) by placing the switch in the shut-off state and measuring the potential difference between both ends of the switch. Diagnosing.
  • Patent Document 1 is known as a prior art document disclosing such a conventional technique.
  • the switch In conventional power supply devices, the switch is placed in a cutoff state, and then the potential difference between both ends of the switch is measured in order to diagnose the cutoff ability of the switch. That is, if the potential difference between both ends of the switch is larger than a predetermined potential difference, the cutoff ability of the switch is determined to be normal, and if not, the cutoff ability of the switch is diagnosed to be abnormal.
  • the switch will respond to the cut-off state instruction due to the influence of the voltage associated with the accumulation of internal charge. Even if the switch responds correctly and is shut off, the potential difference between both ends of the switch becomes small, and it may not be possible to correctly diagnose whether the switch is shut off.
  • leakage current from a resistor in a DC-DC converter or reduction in internal charge due to spontaneous emission may be used.
  • it may take a long time to discharge the internal charge of the DC/DC converter, and a long waiting time may be required for diagnosing the switch interruption.
  • the switch will shut off. Even when the switch is able to shut off in response to a status indication, the potential difference between both ends of the switch becomes small, making it difficult to diagnose the switch's shutoff ability from the potential difference between both ends of the switch.
  • the present disclosure provides a power supply device and a switch diagnosis method that can diagnose the cutoff performance of a switch provided between an input side or an output side and a DC/DC converter included in a power supply device in a short time.
  • the purpose is to
  • a power supply device is configured to be connected between a first DC power supply that supplies and holds a first voltage and a second DC power supply that supplies and holds a second voltage.
  • the power supply device includes a first switch configured to have one end connected to a first DC power supply, a DCDC converter having a first capacitance connected to the other end of the first switch, and a DCDC converter and a first DC power supply.
  • the control unit is configured to control one switch and detect a potential difference between one end and the other end of the first switch.
  • the DC/DC converter converts the voltage stored in the first capacitor into a second voltage and outputs the converted second voltage to the second DC power supply, and the second DC power supply supplies and holds the second voltage.
  • the capacitor is configured to perform at least one of a second operation of converting the second voltage into a third voltage and outputting the converted third voltage to the first capacitance.
  • the control unit detects the potential difference after instructing the first switch to shut off and causing the DC/DC converter to perform the first operation or the second operation, and determines that the first switch is not normal when the detected potential difference is larger than the reference potential difference. It is configured to determine that there is.
  • the switch after instructing the switch to shut off and causing the DC/DC converter to perform the first operation or the second operation, the first end of the switch A potential difference at the other end is detected. When the detected potential difference is larger than a reference potential difference, it is determined that the switch is normal.
  • the present disclosure provides a power supply device and a switch diagnosis method that can diagnose the cutoff performance of a switch provided between an input side or an output side and a DC/DC converter included in the power supply device in a short time.
  • FIG. 1A is a diagram showing the configuration of a power supply device according to an embodiment.
  • FIG. 1B is a diagram showing a flowchart of processing for diagnosing the cutoff performance of the first switch among the operations of the power supply device according to the embodiment.
  • FIG. 1C is a diagram showing a flowchart of processing for diagnosing the cutoff performance of the second switch among the operations of the power supply device according to the embodiment.
  • FIG. 2 is a diagram illustrating a configuration example of a power supply device according to Modification 1 of the embodiment.
  • FIG. 3 is a diagram illustrating a configuration example of a power supply device according to a second modification of the embodiment.
  • FIG. 4 is a diagram illustrating a configuration example of a power supply device according to modification 3 of the embodiment.
  • FIG. 5 is a diagram illustrating a configuration example of a power supply device according to a fourth modification of the embodiment.
  • FIG. 6 is a diagram illustrating a configuration example of a power supply device according to modification 5 of the embodiment.
  • FIG. 7 is a diagram illustrating a circuit of a DC/DC converter according to a first specific example of the power supply device according to the embodiment.
  • FIG. 8 is a diagram illustrating a circuit of a DC/DC converter according to a second specific example of the power supply device according to the embodiment.
  • FIG. 9 is a diagram illustrating a circuit of a DC/DC converter according to a third specific example of the power supply device according to the embodiment.
  • a and B are connected means that A and B are electrically connected, and not only when A and B are directly connected, but also when A and B are connected. This also includes a case where A and B are indirectly connected with another circuit element sandwiched between them.
  • FIG. 1A is a block diagram showing the configuration of a power supply device 1 according to an embodiment.
  • Power supply device 1 is mounted on vehicle 100 in this embodiment.
  • the power supply device 1 according to the embodiment includes a first DC power supply 2, a second DC power supply 3, a DCDC converter 4, a first switch 5, a second switch 6, and a diagnostic section. 8, a first voltage detection section 51, a second voltage detection section 52, a third voltage detection section 61, and a fourth voltage detection section 62.
  • control section 7 has a diagnosis section 8, but the control section 7 and the diagnosis section 8 may be separate elements. Further, the first voltage detection section 51, the second voltage detection section 52, the third voltage detection section 61, and the fourth voltage detection section 62 may be built into the diagnosis section 8.
  • the first DC power supply 2 is capable of outputting (that is, supplying and holding) a first voltage, and is, for example, a battery.
  • the second DC power supply 3 can output (supply and hold) a second voltage, and is, for example, an electric double layer capacitor.
  • a DCDC converter 4 is connected between the first DC power supply 2 and the second DC power supply 3.
  • the DCDC converter 4 includes a first capacitor 91 that can store a first voltage, a second capacitor 92 that can store a second voltage, a current sensor 42 that measures the current flowing through the DCDC converter 4, and a first capacitor 91 that can store a first voltage. It has a power conversion circuit 41 that performs DC voltage conversion to step down the voltage to a second voltage and DC voltage conversion to step up the second voltage to the first voltage.
  • the DCDC converter 4 steps down the first voltage input from the first DC power supply 2 and outputs the stepped down voltage to the second DC power supply 3. Further, the second voltage inputted from the second DC power supply 3 is boosted, and the boosted voltage is output to the first DC power supply 2. Note that in this embodiment, the DCDC converter 4 steps down the first voltage input from the first DC power supply 2 and outputs it to the second DC power supply 3, and converts the second voltage input from the second DC power supply 3 into a lower voltage. was boosted and outputted to the first DC power supply 2, but conversely, the first voltage input from the first DC power supply 2 was boosted and outputted to the second DC power supply 3, and the first voltage input from the second DC power supply 3 was boosted. The second voltage may be stepped down and output to the first DC power supply 2.
  • a first switch 5 is connected between the first DC power supply 2 and the DCDC converter 4, and the first DC power supply 2 and the DCDC converter 4 can be connected and disconnected.
  • a second switch 6 is connected between the second DC power supply 3 and the DCDC converter 4, and the second DC power supply 3 and the DCDC converter 4 can be connected and disconnected.
  • the first switch 5 and the second switch 6 are, for example, semiconductor switches such as metal oxide film field effect transistors (MOSFETs) or contactors such as electromagnetic relays.
  • MOSFETs metal oxide film field effect transistors
  • contactors such as electromagnetic relays.
  • the first voltage detection section 51, the second voltage detection section 52, the third voltage detection section 61, and the fourth voltage detection section 62 are voltmeters, and are, for example, analog/digital (A/D) converters.
  • the control unit 7 controls the DCDC converter 4 to step down the voltage input to the DCDC converter 4 (that is, to step down the first voltage and output it to the second DC power supply 3) or to step up the voltage (that is, to control the second voltage). It is possible to instruct boost control (boosting the voltage and outputting it to the first DC power supply 2). Further, the control unit 7 can instruct the first switch 5 to connect or disconnect the first DC power supply 2 and the DC/DC converter 4 . Furthermore, the control unit 7 can instruct the second switch 6 to connect or disconnect the second DC power supply 3 and the DC/DC converter 4 .
  • control unit 7 can cause the diagnosis unit 8 to measure the voltage across the first switch 5 or the potential difference between the two ends.
  • the control unit 7 issues a cutoff instruction to the first switch 5 and a connection instruction to the second switch 6, and then the DCDC converter 4 performs a voltage conversion operation.
  • the charge of the first capacitance 91 is discharged to the second DC power supply 3. Therefore, it is possible to provide a power supply device 1 that can diagnose the cutoff performance of the first switch 5 in a short time.
  • control unit 7 and the diagnosis unit 8 are realized by a memory that stores a program, a processor that executes the program, an A/D converter, a timer, and the like.
  • a normal voltage conversion operation includes an operation of stepping down the first voltage of the first DC power supply 2 to a second voltage and outputting it to the second DC power supply 3, and converting the second voltage of the second DC power supply 3 to the first voltage. This is an operation in which the voltage is boosted and output to the first DC power supply 2.
  • the control unit 7 controls the first switch 5 to connect the first DC power supply 2 and the DCDC converter 4. Instruct connection. Further, the control unit 7 instructs the second switch 6 to connect the second DC power supply 3 and the DCDC converter 4.
  • the first switch 5 connects the first DC power supply 2 and the DCDC converter 4 based on instructions from the control unit 7. Further, the second switch 6 connects the second DC power supply 3 and the DC/DC converter 4 based on an instruction from the control unit 7 .
  • the voltage input from the first DC power supply 2 or the second DC power supply 3 to the DCDC converter 4 is converted into voltage based on a signal from the control unit 7 to the DCDC converter 4.
  • the first capacitance 91 is charged to the first voltage of the first DC power supply 2.
  • the second capacitance 92 is charged to the second voltage of the second DC power supply 3.
  • FIG. 1B is a flowchart of the process of diagnosing the cutoff performance of the first switch 5 (that is, the switch diagnosis method) among the operations of the power supply device 1 according to the embodiment.
  • the control unit 7 instructs the first switch 5 to cut off the first DC power supply 2 and the DCDC converter 4.
  • the first switch 5 instructs the first switch 5 to cut off the first DC power supply 2 and the DC/DC converter 4 based on the instruction from the control unit 7 (S10).
  • control unit 7 instructs the second switch 6 to connect the second DC power supply 3 and the DCDC converter 4.
  • the second switch 6 connects the second DC power supply 3 and the DCDC converter 4 based on an instruction from the control unit 7 (S11).
  • the order of steps S10 and S11 may be reversed to that shown in FIG. 1B or may be performed simultaneously.
  • control unit 7 operates the DCDC converter 4 to release the charge stored in the first capacitance 91 of the DCDC converter 4 to the second DC power supply 3 (S12). Specifically, the control unit 7 instructs the DCDC converter 4 to perform a step-down operation, and causes the second DC power supply 3 to release the charge stored in the first capacitance 91 of the DCDC converter 4 .
  • the diagnostic unit 8 measures the voltages at two locations at both ends of the first switch 5 by the first voltage detection unit 51 and the second voltage detection unit 52, and thereby calculates the potential difference between both ends of the first switch 5. (S13). If the potential difference between both ends of the first switch 5 calculated by the diagnostic unit 8 is not larger than the reference value (No in S14), the first switch 5 has not been able to cut off the connection between the first DC power supply 2 and the DCDC converter 4. It is confirmed that there is no abnormality, and it is determined that the first switch 5 is not normal but abnormal (S15).
  • the first switch 5 can cut off the connection between the first DC power supply 2 and the DCDC converter 4. It is determined that the first switch 5 is normal (S16). Thereby, it can be determined whether the cutoff function of the first switch 5 is operating normally.
  • the control unit 7 outputs a determination signal to, for example, an electronic control unit (ECU) mounted on the vehicle 100, depending on the result of determining whether the first switch 5 is normal.
  • the ECU performs operations (display, control, etc.) according to the determination signal.
  • the control unit 7 instructs the first switch 5 to disconnect the first DC power supply 2 and the DCDC converter 4
  • the control unit 7 instructs the DCDC converter 4 to In the converter 4, the charge stored in the first capacitor 91 connected between the first switch 5 and the ground is released.
  • the potential difference between both ends of the first switch 5 can be made larger than when the electric charge is not discharged, and the diagnostic section 8 can easily and reliably control the first switch 5. Diagnostics can be performed.
  • the control unit 7 instructs the first switch 5 to cut off the first DC power supply 2 and the DC/DC converter 4, the charge stored in the first capacitance 91 remains. In other words, only the first switch 5 is turned off.
  • the diagnostic unit 8 measures the potential difference between both ends of the first switch 5, there is a charge remaining in the first capacitance 91.
  • the potential difference between both ends of the first switch 5 is smaller than that of the power supply device 1 shown in FIG. Therefore, the diagnostic unit 8 cannot determine whether the first switch 5 is normally shut off.
  • the first capacitance 91 spontaneously discharges charge over time due to the leakage current of the resistor connected in parallel and the DCDC converter 4. It is possible to determine whether or not the first switch 5 is able to shut off the power normally by measuring the power.
  • the control unit 7 instructs the first switch 5 to cut off the first DC power supply 2 and the DCDC converter 4
  • the control unit 7 By instructing the conversion, the charge in the first capacitance 91 is actively discharged in a short time.
  • the charge of the first capacitance 91 can be released in a much shorter time than the spontaneous release of charge, so the first switch 5 can be normally shut off in a shorter time than the spontaneous release. It can be determined whether the
  • FIG. 1C is a flowchart of the process of diagnosing the cutoff performance of the second switch 6 (that is, the switch diagnosis method) among the operations of the power supply device 1 according to the embodiment.
  • the control unit 7 instructs the second switch 6 to cut off the second DC power supply 3 and the DCDC converter 4.
  • the second switch 6 instructs the second switch 6 to shut off the second DC power supply 3 and the DC/DC converter 4 based on the instruction from the control unit 7 (S20).
  • control unit 7 instructs the first switch 5 to connect the first DC power supply 2 and the DCDC converter 4.
  • the first switch 5 connects the first DC power supply 2 and the DCDC converter 4 based on an instruction from the control unit 7 (S21).
  • the order of steps S20 and S21 may be reversed to that shown in FIG. 1C or may be performed simultaneously.
  • control unit 7 operates the DCDC converter 4 to release the charge stored in the second capacitance 92 of the DCDC converter 4 to the first DC power supply 2 (S22). Specifically, the control unit 7 instructs the DCDC converter 4 to perform a step-up operation, and causes the first DC power supply 2 to release the charge stored in the second capacitance 92 of the DCDC converter 4 .
  • the diagnostic section 8 measures the voltages at two locations, one at both ends of the second switch 6, the third voltage detection section 61, and the fourth voltage detection section 62, and thereby calculates the potential difference between the two ends of the second switch 6 ( S23). If the potential difference between both ends of the second switch 6 calculated by the diagnostic unit 8 is not larger than the reference value (No in S24), the second switch 6 has not been able to cut off the connection between the second DC power supply 3 and the DCDC converter 4. It is confirmed that there is no abnormality, and it is determined that the second switch 6 is not normal but abnormal (S25).
  • the second switch 6 can cut off the connection between the second DC power supply 3 and the DCDC converter 4. It is confirmed that the second switch 6 is normal (S26). If the potential difference between both ends of the second switch 6 measured by the diagnostic unit 8 is not larger than the reference value (No in S24), the second switch 6 has not been able to cut off the connection between the second DC power supply 3 and the DCDC converter 4. It is confirmed that the second switch 6 is not normal, and it is determined that the second switch 6 is not normal but abnormal (S26). Thereby, it can be determined whether the cutoff function of the second switch 6 is operating normally.
  • the control unit 7 outputs a determination signal to, for example, an electronic control unit (ECU) mounted on the vehicle 100, depending on the result of determining whether the second switch 6 is normal.
  • the ECU performs operations (display, control, etc.) according to the determination signal.
  • the control unit 7 instructs the second switch 6 to disconnect the second DC power supply 3 and the DCDC converter 4
  • the control unit 7 instructs the DCDC converter 4 to In the converter 4, the charge stored in the second capacitor 92 connected between the second switch 6 and the ground is released.
  • the potential difference between both ends of the second switch 6 can be made larger than when the electric charge is not discharged, and the diagnostic section 8 can easily and reliably control the second switch 6. Diagnostics can be performed.
  • the control unit 7 instructs the second switch 6 to cut off the second DC power supply 3 and the DCDC converter 4, the charge stored in the second capacitance 92 remains. In other words, only the second switch 6 is turned off.
  • the diagnostic unit 8 measures the potential difference between both ends of the second switch 6, there is a charge remaining in the second capacitance 92.
  • the potential difference between the two ends of the second switch 6 is smaller than that of the power supply device 1 shown in FIG. Therefore, the diagnostic unit 8 cannot determine whether the second switch 6 is normally shut off.
  • the second capacitance 92 naturally discharges charge over time due to the leakage current of the resistor connected in parallel or the DC/DC converter 4, so that the second capacitance 92 is connected between both ends of the second switch 6 after a certain period of time has elapsed. It is possible to determine whether or not the second switch 6 is normally shut off by measuring the potential difference between the two.
  • the control unit 7 instructs the second switch 6 to cut off the second DC power supply 3 and the DCDC converter 4
  • the control unit 7 By instructing the conversion, the charge in the second capacitance 92 is actively discharged in a short time.
  • the charge of the second capacitor 92 can be released in a much shorter time than the spontaneous release of charge, so the second switch 6 can be normally shut off in a shorter time than in the past. It is possible to determine whether the
  • each reference value of the potential difference between both ends of the first switch 5 and the second switch 6 is determined based on the cutoff characteristics of the elements or components used for the first switch 5 and the second switch 6.
  • the first DC power supply 2 may be replaced with a capacitor.
  • the first voltage does not necessarily need to be supplied from an active power source, and the capacitor may be charged by the DCDC converter 4 and the voltage after charging may be used as the first voltage.
  • the power source of the vehicle 100 can be configured using only the second DC power source 3, and the vehicle configuration can be advantageous in terms of cost, parts arrangement, weight, etc.
  • the second DC power supply 3 may be replaced with a capacitor.
  • the second voltage does not necessarily need to be supplied from an active power source, and the capacitor may be charged by the DCDC converter 4, and the voltage after charging may be used as the second voltage.
  • the power source of the vehicle 100 can be configured only with the first DC power source 2, and the vehicle configuration can be advantageous in terms of cost, parts arrangement, weight, etc.
  • a fifth voltage detection section 53 may be provided to directly measure the potential difference between both ends of the voltage.
  • the fifth voltage detection section 53 is, for example, an A/D converter.
  • a sixth voltage detection section 63 directly measures the potential difference between both ends of the second switch 6.
  • the sixth voltage detection section 63 is, for example, an A/D converter.
  • the DCDC converter 4 may operate to control the voltage of the first capacitor 91. Specifically, after the control unit 7 instructs the first switch 5 to disconnect the first DC power supply 2 and the DCDC converter 4, the control unit 7 instructs the DCDC converter 4 to perform voltage conversion. At this time, by controlling the voltage of the first capacitor 91 using the voltage of the first capacitor 91 detected by the second voltage detection unit 52 in FIG. 1A, the voltage of the first capacitor 91 is controlled. The voltage can be controlled (that is, set) to any voltage.
  • the first capacitance 91 is charged in advance to be close to the voltage of the first DC power supply 2, and then, Connect the first switch 5.
  • the charging time when the first switch 5 is connected again can be shortened.
  • the voltage of the second voltage detection section 52 can be controlled.
  • the voltage of the first capacitor 91 changes from the first voltage to the determination voltage.
  • the discharge of charge from the first capacitance 91 can be minimized to the minimum required for determining the cutoff function of the first switch 5 .
  • the time required to determine the cutoff function and the charging time required to connect the first switch 5 again can be shortened.
  • the DCDC converter 4 may operate to control the voltage of the second capacitor 92. Specifically, after the control unit 7 instructs the second switch 6 to cut off the second DC power supply 3 and the DCDC converter 4, the control unit 7 instructs the DCDC converter 4 to convert the voltage. At this time, by controlling the voltage of the second capacitance 92 using the voltage of the second capacitance 92 detected by the third voltage detection unit 61, the voltage of the second capacitance 92 can be set arbitrarily. can be controlled (i.e., set) to a voltage of
  • the charging time when the second switch 6 is connected again can be shortened.
  • the voltage of the third voltage detection section 61 can be controlled.
  • the voltage of the second capacitor 92 changes from the second voltage for determination.
  • the discharge of charge from the second capacitance 92 can be minimized to the minimum required for determining the cutoff function of the second switch 6 .
  • the diagnostic unit 8 may detect the current flowing through the power conversion circuit 41 of the DCDC converter 4 using the current sensor 42. After the control unit 7 instructs the first switch 5 to disconnect the first DC power supply 2 and the DC/DC converter 4, or the control unit 7 instructs the second switch 6 to disconnect the second DC power supply 3 and the DC/DC converter 4. After instructing converter 4 to be disconnected, control unit 7 instructs DC/DC converter 4 to perform voltage conversion. At this time, the DC/DC converter 4 may be current controlled so that the current detected by the current sensor 42 is below a specified current, or the conversion of the DC/DC converter 4 may be stopped by detecting that the current has exceeded the specified current. , Even if the cutoff performance of the first switch 5 or the second switch 6 to be diagnosed is lost, excessive power may not be supplied to the first DC power supply 2 or the second DC power supply 3, This can prevent excessive current from flowing.
  • the first switch 5a and the second switch 6a are each configured by one MOSFET.
  • the breaking performance of the first switch 5a and the second switch 6a can be diagnosed using the same method as in the above embodiment.
  • the first switch 5a is constituted by a MOSFET having a body diode as shown, whose forward direction is the direction from the DCDC converter 4 to the first DC power supply 2, so that the flow from the first DC power supply 2 to the DCDC converter 4 Although it has the function of interrupting current, it does not have the function of interrupting the current flowing from the DCDC converter 4 to the first DC power supply 2. Even with such a first switch 5a, in the embodiment, the voltage of the first capacitance 91 is lowered after the first switch 5a is cut off in the diagnosis of the cutoff performance. The interrupting performance of 5a can be diagnosed.
  • the second switch 6a is constituted by a MOSFET having a body diode as shown in the figure, whose forward direction is the direction from the DCDC converter 4 to the second DC power supply 3. 4, but does not have a function of interrupting the current flowing from the DCDC converter 4 to the second DC power supply 3.
  • the voltage of the second capacitance 92 is lowered after the second switch 6a is cut off in the diagnosis of the cutoff performance. The interrupting performance of 6a can be diagnosed.
  • FIG. 6 is a diagram showing a configuration example of a power supply device 1e according to a fifth modification of the embodiment.
  • the power supply device 1e includes a first DC power supply 2, a second DC power supply 3, a DCDC converter 4, a first switch 5b, a second switch 6b, a control unit 7a having a diagnostic unit 8, and a first voltage detection unit. 51, a second voltage detection section 52, a third voltage detection section 61, and a fourth voltage detection section 62. Components that are the same as those in the embodiment are given the same reference numerals and explanations are omitted, and the explanation will focus on points that are different from the above embodiment.
  • the first switch 5b is composed of two MOSFETs connected in series, each having body diodes in opposite forward directions, and has the function of blocking current in both directions.
  • the second switch 6b is configured by connecting two MOSFETs in series, each having body diodes in opposite forward directions, and has the function of blocking current in both directions.
  • control unit 7a and the DCDC converter 4 have the following functions in this modification.
  • the DCDC converter 4 boosts the voltage of the second capacitor 92 and transfers the voltage to the first capacitor 91. The output voltage is converted, thereby charging the first capacitor 91.
  • the DCDC converter 4 steps down the voltage of the first capacitor 91 and transfers it to the second capacitor 92. The output voltage is converted, thereby charging the second capacitor 92.
  • the power supply device 1e is capable of diagnosing the cutoff performance of the first switch 5b that cuts off the first DC power supply 2 and the DC/DC converter 4 and the second switch 6b that cuts off the second DC power supply 3 and the DC/DC converter 4 in a short time. can be provided.
  • the control unit 7a instructs the first switch 5b to cut off the first DC power supply 2 and the DC/DC converter 4.
  • the first switch 5b shuts off the first DC power supply 2 and the DC/DC converter 4 based on an instruction from the control unit 7a.
  • the control unit 7a further switches the voltage-related detection and monitoring target to the first capacitance 91, and detects and monitors the voltage of the first capacitance 91.
  • the control unit 7a operates the DCDC converter 4 and controls the voltage of the first capacitance 91 of the DCDC converter 4 to be higher than the voltage of the first DC power supply 2. Specifically, the control unit 7a instructs the DC/DC converter 4 to perform a step-up operation, causes the DC/DC converter 4 to step up the voltage of the second DC power supply 3, and changes the voltage of the first capacitor 91 to the first DC/DC converter 4. It is controlled so that it is higher than power supply 2. At this time, by setting the first capacitance 91 as the control target for power conversion, the voltage of the first capacitance 91 can be controlled to an arbitrary voltage greater than zero using the existing DCDC converter 4.
  • the diagnostic section 8 measures the potential difference between both ends of the first switch 5b. If the potential difference between both ends of the first switch 5b measured by the diagnostic unit 8 is below the reference value, the first switch 5b correctly connects the first DC power supply 2 and the DC/DC converter 4 according to instructions from the control unit 7a. It can be confirmed that the system has not been shut down in a state where it cannot be handled. Further, when the potential difference between both ends of the first switch 5b measured by the diagnostic unit 8 is larger than the reference value, the first switch 5b controls the first DC power supply 2 and the DC/DC converter 4 in response to an instruction from the control unit 7a. It can be confirmed that the cut-off is completed in the completed state. Thereby, it can be determined whether the first switch 5b is able to normally shut off the first DC power supply 2 and the DC/DC converter 4.
  • the first switch 5a according to the fourth modification shown in FIG. since it does not have the ability to interrupt the current flowing in the direction from the DCDC converter 4 to the first DC power supply 2, it only interrupts the current flowing in the direction from the first DC power supply 2 to the DCDC converter 4.
  • the first switch 5b according to the present modification shown in FIG. 6 has the ability to interrupt current flowing in the direction from the DCDC converter 4 to the first DC power supply 2, Accordingly, the interrupting performance for the current flowing in the direction from the DCDC converter 4 to the first DC power supply 2 can be diagnosed.
  • control unit 7a instructs the second switch 6b to cut off the second DC power supply 3 and the DCDC converter 4.
  • the second switch 6b shuts off the second DC power supply 3 and the DC/DC converter 4 based on instructions from the control unit 7a.
  • the control unit 7a further switches the voltage-related detection and monitoring target to the second capacitance 92, and detects and monitors the voltage of the second capacitance 92.
  • the control unit 7a operates the DCDC converter 4 and controls the voltage of the second capacitance 92 of the DCDC converter 4 to be higher than the voltage of the second DC power supply 3. Specifically, the control unit 7a instructs the DC/DC converter 4 to perform a step-down operation, causes the DC/DC converter 4 to step down the voltage of the first DC power supply 2, and converts the voltage of the second capacitor 92 into the second DC/DC converter 4. It is controlled so that it is higher than power source 3. At this time, by setting the second capacitance 92 as the control target for power conversion, the voltage of the second capacitance 92 can be controlled to an arbitrary voltage greater than zero using the existing DCDC converter 4.
  • the diagnostic section 8 measures the potential difference between both ends of the second switch 6b. If the potential difference between both ends of the second switch 6b measured by the diagnostic unit 8 is below the reference value, the second switch 6b correctly connects the second DC power supply 3 and the DC/DC converter 4 according to instructions from the control unit 7a. It can be confirmed that the system has not been shut down in a state where it cannot be handled. Further, when the potential difference between both ends of the second switch 6b measured by the diagnostic unit 8 is larger than the reference value, the second switch 6b disconnects the second DC power supply 3 and the DCDC converter 4 from the control unit 7a. It can be confirmed that the system is able to respond to instructions and shut down. Thereby, it can be determined whether the second switch 6b is able to normally shut off the second DC power supply 3 and the DC/DC converter 4.
  • the second switch 6a according to the fourth modification shown in FIG. 5 is constituted by one MOSFET, the body diode generally Therefore, since it does not have the ability to interrupt the current flowing in the direction from the DCDC converter 4 to the second DC power supply 3, it only interrupts the current flowing in the direction from the second DC power supply 3 to the DCDC converter 4.
  • the second switch 6b according to the present modification example shown in FIG. Accordingly, the interruption performance in the direction from the DCDC converter 4 to the second DC power supply 3 can be diagnosed.
  • the internal circuit of the DCDC converter 4 in the embodiment has, for example, the following specific configuration and performs the following operations.
  • FIG. 7 is a diagram illustrating a circuit of a DCDC converter 4c according to a first specific example of the DCDC converter 4 of the embodiment. Here, the entire configuration of a power supply device 1f including a DC/DC converter 4c is illustrated.
  • the DCDC converter 4c includes a first switching element 411, a second switching element 412, a reactor 413, a current sensor 42, a first capacitance 91, and a second capacitance 92.
  • a first switching element 411 and a reactor 413 are connected in series from the first switch 5 side to the second switch 6 side at a connection point J4c.
  • One end of the second switching element 412 is connected to a coupling point J4c between the first switching element 411 and the reactor 413, and the other end is connected to ground.
  • the first switching element 411 and the second switching element 412 are both N-channel MOSFETs, and both have body diodes. Further, the body diode has an anode connected to the source electrode side of the first switching element 411 and the second switching element 412, and a cathode connected to the drain electrode side.
  • the DCDC converter 4c when charging the second DC power supply 3 from the first DC power supply 2, the DCDC converter 4c performs a step-down operation.
  • the first switching element 411 and the second switching element 412 perform switching operations under the control of the control unit 7, and the DC voltage of the first DC power supply 2 is stepped down to charge the second DC power supply 3.
  • the first switching element 411 is turned on, the second switching element 412 is turned off, and current flows from the first DC power supply 2 to the second DC power supply 3 via the first switching element 411 and the reactor 413. This causes energy to be stored in the reactor 413.
  • the first switching element 411 is turned off, the second switching element 412 is turned on, and the energy stored in the reactor 413 is released from the ground to the second DC power supply 3 via the second switching element 412 and the reactor 413. Current flows.
  • the above state in which energy is accumulated in the reactor 413 and the above state in which current flows from the ground to the second DC power supply 3 via the second switching element 412 and the reactor 413 are alternately repeated.
  • control unit 7 feeds back the voltage of the second DC power supply 3 to the control unit 7, and then, for example, pulse width modulation (PWM) is used.
  • PWM pulse width modulation
  • the on-duty of the drive signal is determined to control the output from the DCDC converter 4c.
  • control unit 7 may determine the on-duty of the drive signal to the first switching element 411 and the second switching element 412 based on the current value detected by the current sensor 42 and the difference from the target current value. good.
  • the DCDC converter 4c when charging the first DC power supply 2 from the second DC power supply 3, the DCDC converter 4c performs a step-up operation.
  • the first switching element 411 and the second switching element 412 perform switching operations under the control of the control unit 7, and the DC voltage of the second DC power supply 3 is boosted to charge the first DC power supply 2.
  • the first switching element 411 is turned off, the second switching element 412 is turned on, and a current flows from the second DC power supply 3 to the ground via the reactor 413 and the second switching element 412. Energy is stored in reactor 413.
  • the first switching element 411 is turned on, the second switching element 412 is turned off, and the energy stored in the reactor 413 is released, so that the second DC power supply 3 is transferred to the first Current flows to the DC power supply 2.
  • the above state in which energy is accumulated in the reactor 413 and the above state in which current flows from the second DC power supply 3 to the first DC power supply 2 via the reactor 413 and the first switching element 411 are alternately repeated.
  • control unit 7 feeds back the voltage of the first DC power supply 2 to the control unit 7, and then uses, for example, pulse width modulation (PWM).
  • PWM pulse width modulation
  • the on-duty of the drive signal is determined and the output from the DCDC converter 4c is controlled.
  • control unit 7 may determine the on-duty of the drive signal to the first switching element 411 and the second switching element 412 based on the current value detected by the current sensor 42 and the difference from the target current value. good.
  • FIG. 8 is a diagram illustrating a circuit of a DCDC converter 4d according to a second specific example of the DCDC converter 4 of the embodiment. Here, the entire configuration of a power supply device 1g including a DC/DC converter 4d is illustrated.
  • the DCDC converter 4d includes a first switching element 411, a second switching element 412, a reactor 413, a third switching element 414, a fourth switching element 415, a current sensor 42, a first capacitance 91, and a second capacitance 92.
  • the DCDC converter 4d has a configuration in which a third switching element 414 and a fourth switching element 415 are added to the DCDC converter 4c according to the first specific example.
  • the differences from the DCDC converter 4c according to the first specific example will be mainly explained.
  • a first switching element 411, a reactor 413, and a third switching element 414 are connected in series at a connection point J4d from the first switch 5 side to the second switch 6 side.
  • the fourth switching element 415 has one end connected to a coupling point J4d between the third switching element 414 and the reactor 413, and the other end connected to the ground.
  • Both the third switching element 414 and the fourth switching element 415 are N-channel MOSFETs, and both have body diodes. Further, the body diode has an anode connected to the source electrode side of the third switching element 414 and the fourth switching element 415, and a cathode connected to the drain electrode side.
  • the DCDC converter 4d when charging the second DC power supply 3 from the first DC power supply 2, the DCDC converter 4d can perform not only a step-down operation but also a step-up operation according to instructions from the control unit 7.
  • the third switching element 414 is kept on and the fourth switching element 415 is kept off, and operates in the same manner as the DCDC converter 4c according to the first example.
  • the first switching element 411 when performing a boost operation, the first switching element 411 is kept on, the second switching element 412 is kept off, and the third switching element 414 and the fourth switching element 415 are operated according to the control by the control section 7.
  • a switching operation is performed, and the DC voltage of the first DC power supply 2 is boosted to charge the second DC power supply 3.
  • the first switching element 411 is kept on, the second switching element 412 is kept off, the third switching element 414 is turned off, and the fourth switching element 415 is turned on, and the first DC power supply is turned on.
  • the third switching element 414 is turned on and the fourth switching element 415 is turned off, and the energy stored in the reactor 413 is released. Accordingly, current flows from the first DC power supply 2 to the second DC power supply 3 via the first switching element 411, the reactor 413, and the third switching element 414.
  • the above state in which energy is accumulated in the reactor 413 and the above state in which current flows from the first DC power supply 2 to the second DC power supply 3 via the first switching element 411, the reactor 413 and the third switching element 414 alternate. repeated.
  • the control unit 7 instructs the first switch 5 to cut off, and instructs the second switch 5 to shut off the cutoff performance.
  • the DC/DC converter 4d performs a voltage conversion operation and discharges the charge of the first capacitance 91 to the second DC power supply 3. Therefore, it is possible to provide a power supply device 1 that can diagnose the cutoff performance of the first switch 5 in a short time.
  • control section 7 feeds back the voltage of the second DC power supply 3 to the control section 7, and then uses, for example, pulse width modulation (PWM).
  • PWM pulse width modulation
  • the on-duty of the drive signal is determined to control the output from the DCDC converter 4d.
  • control unit 7 may determine the on-duty of the drive signal to the third switching element 414 and the fourth switching element 415 based on the current value detected by the current sensor 42 and the difference from the target current value. good.
  • the DC/DC converter 4d when charging the first DC power supply 2 from the second DC power supply 3, can perform not only a step-up operation but also a step-down operation according to instructions from the control unit 7.
  • the third switching element 414 is kept on and the fourth switching element 415 is kept off, and the same operation as the DCDC converter 4c according to the first example is performed.
  • the first switching element 411 is kept on, the second switching element 412 is kept off, and the third switching element 414 and the fourth switching element 415 are operated according to the control by the control section 7.
  • a switching operation is performed, and the DC voltage of the second DC power supply 3 is stepped down to charge the first DC power supply 2.
  • the third switching element 414 is turned on and the fourth switching element 415 is turned off, and the second DC power supply is turned off.
  • the third switching element 414 is turned off and the fourth switching element 415 is turned on, and the energy stored in the reactor 413 is released.
  • the above state in which energy is accumulated in the reactor 413 and the above state in which current flows from the ground to the first DC power supply 2 via the fourth switching element 415, the reactor 413, and the first switching element 411 are alternately repeated.
  • the control unit 7 instructs the second switch 6 to cut off the cutoff performance, 5 the DC/DC converter 4d performs a voltage conversion operation and discharges the charge of the second capacitance 92 to the first DC power supply 2. Therefore, it is possible to provide the power supply device 1 that can diagnose the cutoff performance of the second switch 6 in a short time.
  • control unit 7 feeds back the voltage of the first DC power supply 2 to the control unit 7, and then, for example, pulse width modulation (PWM) is used.
  • PWM pulse width modulation
  • the on-duty of the drive signal is determined to control the output from the DCDC converter 4d.
  • control unit 7 may determine the on-duty of the drive signal to the third switching element 414 and the fourth switching element 415 based on the current value detected by the current sensor 42 and the difference from the target current value. good.
  • FIG. 9 is a diagram illustrating a circuit of a DCDC converter 4e according to a third specific example of the embodiment. Here, the entire configuration of a power supply device 1h including a DC/DC converter 4e is illustrated.
  • the DCDC converter 4e includes a fifth switching element 416, a transformer 417, a diode 418, a current sensor 42, a first capacitance 91, and a second capacitance 92.
  • the fifth switching element 416 is an N-channel MOSFET whose source electrode is grounded and whose drain electrode is connected to the primary winding of the transformer 417, and has a body diode.
  • the body diode has an anode connected to the source electrode side of the fifth switching element 416 and a cathode connected to the drain electrode side.
  • One end of the secondary winding of the transformer 417 is grounded, and the other end is connected to the anode of the diode 418.
  • a cathode of the diode 418 is connected to the second switch 6.
  • the DCDC converter 4e charges the second DC power supply 3 from the first DC power supply 2.
  • the DCDC converter 4e performs a step-up/down operation according to instructions from the control section 7. At this time, whether the step-up operation or the step-down operation is performed is determined by the winding ratio of the transformer 417, the on-duty of the control signal from the control section 7 to the fifth switching element 416, and the like.
  • the fifth switching element 416 performs a switching operation according to the control by the control unit 7, and the DC voltage of the first DC power supply 2 is stepped up and down, and the second DC power supply is Charge power source 3.
  • the fifth switching element 416 since current intermittently flows through the primary winding of the transformer 417 due to switching of the fifth switching element 416, an alternating current voltage is generated in the secondary winding of the transformer 417, and the alternating current voltage is The voltage is half-wave rectified by the diode 418 and smoothed by the second capacitor 92 to become a DC voltage, which is output to the second DC power supply 3.
  • the control unit 7 instructs the first switch 5 to cut off, and instructs the second switch 6, the DCDC converter 4e performs a voltage conversion operation and discharges the charge of the first capacitance 91 to the second DC power supply 3. Therefore, it is possible to provide a power supply device 1 that can diagnose the cutoff performance of the first switch 5 in a short time.
  • control unit 7 feeds back the voltage of the second DC power supply 3 to the control unit 7, and then determines the on-duty for a drive signal using pulse width modulation (PWM), for example.
  • PWM pulse width modulation
  • control unit 7 may determine the on-duty of the drive signal to the fifth switching element 416 based on the current value detected by the current sensor 42 and the difference from the target current value.
  • the power supply device 1 includes the first DC power supply 2 that supplies and holds the first voltage, and the second DC power supply 3 that supplies and holds the second voltage.
  • the power supply device is connected between the first switch 5 and the first DC power supply 2, and includes a first switch 5 having one end connected to the first DC power supply 2, and a first capacitor 91 connected to the other end of the first switch 5.
  • the DCDC converter 4 is caused to perform the first operation or the second operation, so that when the cut-off ability of the first switch 5 is normal, In this case, the potential difference between both ends of the first switch 5 increases in a shorter time than in the conventional case. Therefore, a power supply device is realized in which the breaking performance of the switch provided between the input side or the output side and the DC/DC converter included in the power supply device can be diagnosed in a short time.
  • the DCDC converter 4 may perform a step-down operation or a step-up operation as the first operation or the second operation. Thereby, a power supply device that performs power conversion between the first DC power supply 2 and the second DC power supply 3 having various voltages is realized.
  • the DCDC converter 4 may include a current sensor 42 that detects the current flowing through the DCDC converter 4. Thereby, the DCDC converter 4 can perform at least one of the first operation and the second operation through control based on the current detected by the current sensor 42.
  • the DCDC converter 4 can determine that the current is abnormal and stop at least one of the first operation and the second operation.
  • the DCDC converter 4 may charge the first capacitance 91 to an arbitrary third voltage by the first operation or the second operation when the first switch 5 is cut off.
  • the potential difference between both ends of the first switch 5 is prevented from becoming too large, and the time required to restore the voltage of the first capacitor 91 at the end of the diagnosis is reduced. It will be shortened.
  • the control unit 7 causes the DC/DC converter 4 to perform the first operation so that the voltage of the first capacitance 91 becomes smaller than the first voltage. , may be lowered.
  • the breaking ability of the first switch 5 not only can the breaking ability of the first switch 5 be diagnosed in a shorter time than conventionally, but also the first static The ability to interrupt current flowing in the direction to the terminal connected to the capacitance 91 can be diagnosed.
  • the control unit 7 causes the DCDC converter 4 to perform a second operation so that the voltage of the first capacitance 91 becomes higher than the first voltage. , may be increased.
  • the breaking ability of the first switch 5 can be diagnosed in a shorter time than conventionally, but also the first switch 5 can be The ability to interrupt current flowing in the direction to the terminal connected to the DC power source 2 can be diagnosed.
  • the power supply device 1 further includes a second switch 6 whose one end is connected to the second DC power supply 3, and the DCDC converter 4 further includes a second capacitor connected to the other end of the second switch 6. 92, the control unit 7 further detects the potential difference across the second switch 6 after cutting off the second switch 6 and causing the DCDC converter 4 to perform the first operation or the second operation, It may be determined that the second switch 6 is normal when the detected potential difference is larger than the second reference potential difference.
  • the first switch 5 can be diagnosed, but also the second switch 6 can be diagnosed in the same manner as the first switch 5.
  • the switch diagnosis method includes a first DC power supply 2 that supplies and holds the first voltage, and a second DC power supply 3 that supplies and holds the second voltage.
  • a method for diagnosing a first switch 5 provided in a power supply device 1 connected between A DC/DC converter 4 having a first capacitance 91 connected to the DC/DC converter 4 converts the voltage stored in the first capacitance 91 into a second voltage, and supplies the converted second voltage to the second DC power supply 3. At least one of the first operation of outputting and the second operation of converting the second voltage supplied and held by the second DC power supply 3 into a third voltage and outputting the converted third voltage to the first capacitor 91.
  • the diagnostic method includes causing the first switch 5 to cut off both ends (S10), causing the DCDC converter 4 to perform the first operation or the second operation (S12), and then The potential difference between both ends of the switch 5 is detected (S13), and when the detected potential difference is larger than the first reference potential difference (No in S14), it is determined that the first switch 5 is normal (S16).
  • the DCDC converter 4 is caused to perform the first operation or the second operation, so that when the cut-off ability of the first switch 5 is normal, In this case, the potential difference between both ends of the first switch 5 increases in a shorter time than in the conventional case. Therefore, a method for diagnosing a switch that can diagnose the breaking performance of a switch provided between the input side or the output side and the DC/DC converter included in the power supply device in a short time is realized.
  • the power supply device is a power supply device that is connected between two DC power supplies and performs voltage conversion, and more specifically, the power supply device is provided between an input side or an output side and a DCDC converter included in the power supply device.
  • a power supply device that can diagnose the cutoff performance of a switch in a short time, it can be widely used, for example, in a vehicle-mounted power conversion device that converts power between a battery and a capacitor.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Dc-Dc Converters (AREA)
PCT/JP2023/008224 2022-05-27 2023-03-06 電源装置およびスイッチの診断方法 Ceased WO2023228508A1 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CN202380041683.2A CN119301836A (zh) 2022-05-27 2023-03-06 电源装置及开关的诊断方法
JP2024522919A JPWO2023228508A1 (https=) 2022-05-27 2023-03-06
EP23811389.8A EP4535600A4 (en) 2022-05-27 2023-03-06 POWER SUPPLY DEVICE AND SWITCH DIAGNOSTIC METHOD
US18/857,519 US20250258228A1 (en) 2022-05-27 2023-03-06 Power supply device and switch diagnosis method

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022086661 2022-05-27
JP2022-086661 2022-05-27

Publications (1)

Publication Number Publication Date
WO2023228508A1 true WO2023228508A1 (ja) 2023-11-30

Family

ID=88918928

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2023/008224 Ceased WO2023228508A1 (ja) 2022-05-27 2023-03-06 電源装置およびスイッチの診断方法

Country Status (5)

Country Link
US (1) US20250258228A1 (https=)
EP (1) EP4535600A4 (https=)
JP (1) JPWO2023228508A1 (https=)
CN (1) CN119301836A (https=)
WO (1) WO2023228508A1 (https=)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007252082A (ja) * 2006-03-15 2007-09-27 Toyota Motor Corp 電源制御装置およびリレーの異常検出方法
JP2015008600A (ja) * 2013-06-25 2015-01-15 株式会社Ｇｓユアサ スイッチ故障診断装置、スイッチ故障診断方法
JP2018182864A (ja) * 2017-04-10 2018-11-15 株式会社デンソー 電力制御装置および電力制御方法
WO2019077958A1 (ja) * 2017-10-17 2019-04-25 株式会社村田製作所 電源装置、電力制御装置、電源装置のリレー判定方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6387615B2 (ja) * 2014-01-15 2018-09-12 日産自動車株式会社 車両の制御装置
JP7482354B2 (ja) * 2019-06-07 2024-05-14 パナソニックＩｐマネジメント株式会社 車載電源システム

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007252082A (ja) * 2006-03-15 2007-09-27 Toyota Motor Corp 電源制御装置およびリレーの異常検出方法
JP2015008600A (ja) * 2013-06-25 2015-01-15 株式会社Ｇｓユアサ スイッチ故障診断装置、スイッチ故障診断方法
JP2018182864A (ja) * 2017-04-10 2018-11-15 株式会社デンソー 電力制御装置および電力制御方法
WO2019077958A1 (ja) * 2017-10-17 2019-04-25 株式会社村田製作所 電源装置、電力制御装置、電源装置のリレー判定方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP4535600A4 *

Also Published As

Publication number Publication date
EP4535600A4 (en) 2025-09-17
JPWO2023228508A1 (https=) 2023-11-30
CN119301836A (zh) 2025-01-10
EP4535600A1 (en) 2025-04-09
US20250258228A1 (en) 2025-08-14

Similar Documents

Publication Publication Date Title
CN110165761B (zh) 电源系统
JP7482354B2 (ja) 車載電源システム
US11052771B2 (en) Vehicle-mounted power supply device
WO2018070231A1 (ja) 車載用のバックアップ装置
US11198405B2 (en) In-vehicle backup circuit and in-vehicle backup device
CN115051423B (zh) 充放电控制装置
JP2008072880A (ja) 電源システム
CN109804524B (zh) 车辆用备用装置
WO2018180753A1 (ja) 電源装置
CN112218788A (zh) 车载用的电源控制装置和车载用电源系统
JP2022150075A (ja) 電源切替装置
JP5304279B2 (ja) 蓄電装置
WO2017086110A1 (ja) 充放電装置
KR101500146B1 (ko) 양방향 컨버터 구동 제어 방법
WO2023228508A1 (ja) 電源装置およびスイッチの診断方法
JP2011055681A (ja) 電力変換装置
JP7279570B2 (ja) 電圧測定装置
US10734827B2 (en) Power supply system
CN119497947A (zh) 车载用控制装置
US12498420B2 (en) Power supply, and diagnostic method for power supply
US12330514B2 (en) In-vehicle system and vehicle brake diagnostic device with a single relay connection
JP2017184301A (ja) 電圧変換装置
US20250237692A1 (en) Diagnosis device
US20190351851A1 (en) Onboard control device and onboard power supply device
WO2024171422A1 (ja) 異常判定装置

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: 23811389

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2024522919

Country of ref document: JP

Kind code of ref document: A

WWE Wipo information: entry into national phase

Ref document number: 18857519

Country of ref document: US

WWE Wipo information: entry into national phase

Ref document number: 202380041683.2

Country of ref document: CN

NENP Non-entry into the national phase

Ref country code: DE

WWE Wipo information: entry into national phase

Ref document number: 2023811389

Country of ref document: EP

ENP Entry into the national phase

Ref document number: 2023811389

Country of ref document: EP

Effective date: 20250102

WWP Wipo information: published in national office

Ref document number: 202380041683.2

Country of ref document: CN

WWP Wipo information: published in national office

Ref document number: 2023811389

Country of ref document: EP

WWP Wipo information: published in national office

Ref document number: 18857519

Country of ref document: US