WO2017168835A1 - Ground fault detection circuit diagnosing device - Google Patents

Ground fault detection circuit diagnosing device Download PDF

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Publication number
WO2017168835A1
WO2017168835A1 PCT/JP2016/085768 JP2016085768W WO2017168835A1 WO 2017168835 A1 WO2017168835 A1 WO 2017168835A1 JP 2016085768 W JP2016085768 W JP 2016085768W WO 2017168835 A1 WO2017168835 A1 WO 2017168835A1
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WO
WIPO (PCT)
Prior art keywords
ground fault
fault detection
circuit
resistor
detection circuit
Prior art date
Application number
PCT/JP2016/085768
Other languages
French (fr)
Japanese (ja)
Inventor
伊藤　智之
守 倉石
慎司 広瀬
宏昌 吉澤
和寛 新村
Original Assignee
株式会社豊田自動織機
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Publication date
Application filed by 株式会社豊田自動織機 filed Critical 株式会社豊田自動織機
Publication of WO2017168835A1 publication Critical patent/WO2017168835A1/en

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    • 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
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • 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
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
    • 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
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • 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
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/52—Testing for short-circuits, leakage current or ground faults
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Definitions

  • the present invention relates to a ground fault detection circuit diagnostic device for diagnosing whether or not a ground fault detection circuit is normal.
  • Patent Document 1 As an existing ground fault detection circuit diagnostic device, for example, there is one using a zero-phase current transformer. For example, see Patent Document 1. Further, as related techniques, for example, there are Patent Document 2 and Patent Document 3.
  • JP 2000-019211 A JP-A-10-221395 JP2015-032602A
  • the objective which concerns on one side of this invention provides the ground fault detection circuit diagnostic apparatus which can diagnose whether the ground fault detection circuit provided in the output stage of the power converter circuit in a charger is normal. That is.
  • a ground fault detection circuit diagnostic apparatus includes a resistor, a ground fault detection circuit, a first ground fault detection diagnostic circuit, and a control unit. A current in the first direction flows through the resistor when the power supply line on the output side of the power conversion circuit is grounded.
  • the ground fault detection circuit detects that the power supply line is grounded when a current in the first direction flows through the resistor.
  • the first ground fault detection diagnostic circuit passes a current in the first direction through the resistor.
  • the control unit controls the operation of the first ground fault detection diagnostic circuit to pass a current in the first direction through the resistor
  • the ground fault detection circuit detects that the power supply line is grounded. Then, the ground fault detection circuit is diagnosed as normal.
  • the present invention it is possible to diagnose whether or not the ground fault detection circuit provided at the output stage of the power conversion circuit in the charger is normal.
  • Drawing 1 is a figure showing an example of a charger with which a ground fault detection circuit diagnostic device of an embodiment is provided.
  • the charger 10 shown in FIG. 1 converts AC power supplied from the commercial power source P into DC power and supplies it to the battery pack 20.
  • the battery pack 20 is mounted on a vehicle such as an electric forklift, for example, and includes a battery B, a relay Re, and a control unit 21.
  • the battery B is composed of, for example, a plurality of lithium ion batteries, and supplies power to a load such as an inverter circuit that drives a traveling motor.
  • the relay Re is constituted by, for example, a mechanical relay or a semiconductor relay such as a MOSFET (Metal Oxide Semiconductor Semiconductor Field Field Effect Transistor), and is connected to the positive terminal or the negative terminal of the battery B.
  • MOSFET Metal Oxide Semiconductor Semiconductor Field Field Effect Transistor
  • the control unit 21 is configured by, for example, a CPU (Central Processing Unit) or a programmable device (FPGA (Field Programmable Gate Array), PLD (Programmable Logic Device), etc.), and controls ON / OFF of the relay Re.
  • a CPU Central Processing Unit
  • FPGA Field Programmable Gate Array
  • PLD Programmable Logic Device
  • the charger 10 includes a plurality of power conversion circuits 11, a resistor R1, and a ground fault detection circuit diagnostic device 12.
  • Each power conversion circuit 11 converts AC power supplied from the commercial power source P into DC power.
  • the power conversion circuits 11 are connected in parallel to each other. That is, the plus output terminal of each power conversion circuit 11 is connected to the plus side power supply line Lp (the feed side power supply line of the power conversion circuit 11), and the minus output terminal of each power conversion circuit 11 is respectively the minus side feed line Ln. It is connected to (feed line on the output side of the power conversion circuit 11).
  • the minus side power supply line Ln is connected to a housing ground FG (Frame Ground) via a Y capacitor C.
  • the case ground FG is connected to a protective ground PE (Protective Earth).
  • the plus output terminal of each power conversion circuit 11 is connected to the plus terminal of the battery B via the plus-side power supply line Lp and the relay Re, respectively.
  • the negative output terminal of each power conversion circuit 11 is connected to the negative terminal of the battery B via the negative power supply line Ln.
  • relay Re is turned on and power is output from each power conversion circuit 11, power is supplied to battery B and battery B is charged.
  • the resistor R1 is provided between the plus-side power supply line Lp and the minus-side power supply line Ln, and reduces a noise component included in the combined power output from each power conversion circuit 11.
  • the ground fault detection circuit diagnostic device 12 includes a resistor R2 (second resistor), a resistor R3 (third resistor), a resistor R4 (resistance), a ground fault detection circuit 121, and a first ground fault detection diagnosis.
  • the circuit 122, the 2nd ground fault detection diagnostic circuit 123, and the control part 124 are provided.
  • One end of the resistor R2 is connected to the plus side feed line Lp, one end of the resistor R3 is connected to the minus side feed line Ln, one end of the resistor R4 is connected to the protective ground PE, and each of the resistors R2 to R4 is connected. The other ends are connected to each other.
  • the positive side feed line Lp Is grounded when the positive-side power supply line Lp is short-circuited to the protective ground PE, the negative-side power supply is supplied from the positive-side power supply line Lp via the protective ground PE, the resistor R4, the connection point p between the resistors R2 to R4, and the resistor R3.
  • the positive side feed line Lp Causes a current I1 in the first direction (from the protective ground PE toward the connection point p of the resistors R2 to R4) to flow through the resistor R4. Further, for example, when the first ground fault detection diagnostic circuit 122 and the second ground fault detection diagnostic circuit 123 are not operating and when power is output from the power conversion circuit 11, the negative side supply is performed.
  • the negative side of the positive side feed line Lp is connected via the resistor R2, the connection point p of the resistors R2 to R4, the resistor R4, and the protective ground PE.
  • a current flows to the side power supply line Ln. That is, when the first ground fault detection diagnostic circuit 122 and the second ground fault detection diagnostic circuit 123 are not operating and when power is output from the power conversion circuit 11, the negative side feed line Ln Causes a current I2 in the second direction opposite to the first direction (the direction from the connection point p of the resistors R2 to R4 to the protective ground PE) to flow through the resistor R4.
  • the ground fault detection circuit 121 is configured by, for example, a comparator, a bipolar transistor, and the like.
  • the power supply on the output side of each power conversion circuit 11 is supplied. It is detected that the electric wire (plus side feed line Lp or minus side feed line Ln) is grounded, and the ground fault detection circuit detection signal Sdec sent to the control unit 124 is changed from the high level to the low level.
  • the first ground fault detection diagnostic circuit 122 includes a photocoupler Ph1 (first photocoupler) and a switching element SW1.
  • the collector terminal of the phototransistor of the photocoupler Ph1 is connected to the positive power supply line Lp, and the emitter terminal of the phototransistor of the photocoupler Ph1 is connected to one end of the resistor R4.
  • a predetermined voltage is applied to the anode terminal of the light emitting diode of the photocoupler Ph1.
  • the switching element SW1 is, for example, a MOSFET, the drain terminal of the switching element SW1 is connected to the cathode terminal of the light emitting diode of the photocoupler Ph1, and the source terminal of the switching element SW1 is connected to the housing ground FG.
  • the photocoupler Ph1 when the + -PE ground fault start signal S1 input to the gate terminal of the switching element SW1 changes from low level to high level and the switching element SW1 is turned on to turn on the light emitting diode of the photocoupler Ph1, the photocoupler Ph1 is turned on. The phototransistor is turned on. At this time, if the plus-side feed line Lp and the minus-side feed line Ln are not grounded and power is output from the power conversion circuit 11, the phototransistor of the photocoupler Ph1 and the resistor R4 are output from the plus-side feed line Lp. Then, a current flows to the negative power supply line Ln through the connection point p of the resistors R2 to R4 and the resistor R3.
  • the second ground fault detection diagnostic circuit 123 includes a photocoupler Ph2 (second photocoupler) and a switching element SW2.
  • the collector terminal of the phototransistor of the photocoupler Ph2 is connected to one end of the resistor R4, and the emitter terminal of the phototransistor of the photocoupler Ph1 is connected to the negative power supply line Ln.
  • a predetermined voltage is applied to the anode terminal of the light emitting diode of the photocoupler Ph2.
  • the switching element SW2 is, for example, a MOSFET, the drain terminal of the switching element SW2 is connected to the cathode terminal of the light emitting diode of the photocoupler Ph2, and the source terminal of the switching element SW2 is connected to the housing ground FG.
  • the photocoupler Ph2 is turned on.
  • the phototransistor is turned on.
  • the plus-side feed line Lp and the minus-side feed line Ln are not grounded and power is output from the power conversion circuit 11, the plus-side feed line Lp is connected to the resistors R2 and R2-R4. A current flows to the negative power supply line Ln via the point p, the resistor R4, and the phototransistor of the photocoupler Ph2.
  • the control unit 124 is constituted by, for example, a CPU or a programmable device (FPGA or PLD).
  • the control unit 124 sends an instruction for turning the relay Re from on to off to the control unit 21 of the battery pack 20.
  • the control unit 21 controls the relay Re from on to off. If the relay Re is turned off from on while the battery B is being charged, the positive side power supply line Lp and the negative side power supply line Ln of the charger 10 are opened.
  • the control unit 124 sends an instruction for outputting power (voltage) from the power conversion circuit 11 to at least one power conversion circuit 11. When receiving the instruction, the power conversion circuit 11 outputs power (voltage).
  • control unit 124 controls the operation of the first ground fault detection diagnostic circuit 122 to flow the current I1 in the first direction through the resistor R4. Further, the control unit 124 controls the operation of the second ground fault detection / diagnosis circuit 123 to flow the current I2 in the second direction through the resistor R4. Further, when the ground fault detection circuit detection signal Sdec changes from the high level to the low level, the control unit 124 detects that the power supply line on the output side of each power conversion circuit 11 is grounded by the ground fault detection circuit 121. Judge that In addition, the control unit 124 controls the operation of the first ground fault detection diagnostic circuit 122 to pass the current I1 in the first direction through the resistor R4.
  • the ground fault detection diagnostic circuit 123 is controlled to pass a current I2 in the second direction through the resistor R4.
  • the ground fault detection circuit 121 detects that the power supply line on the output side of each power conversion circuit 11 is grounded, the ground fault detection circuit 121 is diagnosed as normal.
  • FIG. 2 is a flowchart illustrating an example of the operation of the control unit 124 during normal diagnosis of the ground fault detection circuit 121.
  • the control unit 124 opens the positive power supply line Lp and the negative power supply line Ln of the charger 10 (S21), and outputs power (voltage) from at least one power conversion circuit 11 (S22).
  • control unit 124 controls the operation of the first ground fault detection diagnostic circuit 122 to flow the current I1 in the first direction through the resistor R4 (S23), and the ground fault detection circuit 121 causes the ground of the feeder line to flow. It is determined whether or not a fault has been detected (S24).
  • the control unit 124 determines that the ground fault of the feeder line is not detected by the ground fault detection circuit 121 when the current I1 in the first direction is flowing through the resistor R4 (S24: No), the ground fault detection circuit It is diagnosed that 121 is not normal (the ground fault detection circuit 121 is abnormal) (S25).
  • the control unit 124 determines that the ground fault of the feeder line is detected by the ground fault detection circuit 121 when the current I1 in the first direction is flowing through the resistor R4 (S24: Yes)
  • the second By controlling the operation of the ground fault detection diagnostic circuit 123, the current I2 in the second direction is caused to flow through the resistor R4 (S26), and it is determined whether or not the ground fault of the feeder line is detected by the ground fault detection circuit 121. (S27).
  • the control unit 124 determines that the ground fault of the feeder line is not detected by the ground fault detection circuit 121 when the current I2 in the second direction is flowing through the resistor R4 (S27: No), the ground fault detection circuit It is diagnosed that 121 is not normal (the ground fault detection circuit 121 is abnormal) (S25).
  • control unit 124 determines that the ground fault of the feeder line is detected by the ground fault detection circuit 121 when the current I2 in the second direction is flowing through the resistor R4 (S27: Yes), the ground fault is detected. It is diagnosed that the detection circuit 121 is normal (S28).
  • the control unit 124 sends an instruction for turning the relay Re from on to off to the control unit 21 of the battery pack 20, and then the power (voltage) from the power conversion circuit 11. Is sent to at least one power conversion circuit 11. Then, power (voltage) is output from the instructed power conversion circuit 11, and as shown in FIG. 3, the voltage Vout applied to the plus-side power supply line Lp changes from the low level to the high level at time t1.
  • the control unit 124 changes the + -PE ground fault start signal S1 from the low level to the high level from time t2 to time t3. Then, the photocoupler Ph1 of the first ground fault detection diagnostic circuit 122 is turned on, and the current I1 in the first direction flows through the resistor R4. When the ground fault detection circuit 121 detects that the current I1 in the first direction flows through the resistor R4 and the power supply line on the output side of each power conversion circuit 11 is grounded, as shown in FIG. The detection circuit diagnostic signal Sdec changes from the high level to the low level.
  • the control unit 124 When the ground fault detection circuit diagnostic signal Sdec becomes low level during the period (time t2 to time t3) during which the + -PE ground fault start signal S1 is at the high level, the control unit 124 The fault start signal S1 is returned from the high level to the low level, and after a predetermined time has elapsed, as shown in FIG. 3, the ground fault start signal S2 between --PE is changed from the low level to the high level from time t4 to time t5. Then, the photocoupler Ph2 of the second ground fault detection diagnostic circuit 122 is turned on, and the current I2 in the second direction flows through the resistor R4.
  • ground fault detection circuit 121 detects that the power supply line on the output side of each power conversion circuit 11 is grounded by the current I2 flowing in the second direction through the resistor R4, as shown in FIG.
  • the ground fault detection circuit diagnostic signal Sdec changes from the high level to the low level.
  • the control unit 124 detects the ground fault detection circuit 121. As shown in FIG. 3, the ground fault detection circuit diagnosis end signal is changed from the low level to the high level.
  • the power conversion circuit 11 stops outputting power (voltage) when the ground fault detection circuit diagnosis end signal changes from low level to high level. Then, as shown in FIG. 3, the voltage Vout changes from the high level to the low level.
  • the resistance R4 is controlled by controlling the operation of the first ground fault detection diagnostic circuit 122 when the output power supply line of each power conversion circuit 11 is opened.
  • the ground fault detection circuit 121 detects that the power supply line on the output side of each power conversion circuit 11 is grounded, and the second ground fault detection diagnosis
  • the ground fault detection circuit 121 may cause a ground fault on the output side of each power conversion circuit 11.
  • the ground fault detection circuit 121 is diagnosed as normal.
  • ground fault detection circuit 121 is normal by intentionally grounding the power supply line on the output side of each power conversion circuit 11 when the power supply line on the output side of each power conversion circuit 11 is opened. Is diagnosed. Thereby, it is possible to diagnose whether or not the ground fault detection circuit 121 provided at the output stage of each power conversion circuit 11 in the charger 10 is normal.
  • the first ground fault detection diagnostic circuit 122 is connected to the point where the output power supply lines Lp on the output side of each power conversion circuit 11 are connected to each other.
  • the ground fault detection circuit 121 is provided in both the period in which the current I1 in the first direction flows through the resistor R4 and the period in which the current I2 in the second direction flows through the resistor R4.
  • the control unit 124 diagnoses that the ground fault detection circuit 121 is normal. However, only when the current I1 in the first direction flows through the resistor R4, the ground fault is detected.
  • the control unit 124 may diagnose that the ground fault detection circuit 121 is normal.
  • the 2nd ground fault detection diagnostic circuit 123 can be abbreviate
  • the positive power supply line Lp and the negative power supply line Ln of the charger 10 are opened by turning off the relay Re provided in the battery pack 20.
  • a relay may be provided on the side power supply line Lp, and the relay may be controlled from on to off by the control unit 124 so that the plus side power supply line Lp and the minus side power supply line Ln are opened.
  • the structure provided only with one power converter circuit 11 in the charger 10 may be sufficient.
  • the ground fault detection circuit 121 detects a ground fault of the feeder line
  • the ground fault detection circuit diagnostic signal Sdec is changed from the high level to the low level.
  • the ground fault detection circuit diagnostic signal Sdec is low. A configuration in which the level is changed to a high level may be used.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

A ground fault detection circuit diagnosing device 12 is configured to be provided with: a resistor R4 through which electric current I1 flows in a first direction when a positive-side power supply line Lp on the output side of a power conversion circuit 11 is grounded; a ground fault detection circuit 121 which, when the electric current flows in the first direction through the resistor R4, detects that the positive-side power supply line Lp or a negative-side power supply line Ln is grounded; a first ground fault detection diagnosing circuit 122 which causes the electric current I1 to flow in the first direction through the resistor R4; and a control unit 124 which, when the ground fault detection circuit 121 detects that the positive-side power supply line Lp or the negative-side power supply line Ln is grounded while an operation of the first ground fault detection diagnosing circuit 122 is controlled so as to cause the electric current I1 to flow in the first direction through the resistor R4, diagnoses that the ground fault detection circuit 121 is normal.

Description

地絡検知回路診断装置Ground fault detection circuit diagnostic device
　本発明は、地絡検知回路が正常であるか否かを診断する地絡検知回路診断装置に関する。 The present invention relates to a ground fault detection circuit diagnostic device for diagnosing whether or not a ground fault detection circuit is normal.
　既存の地絡検知回路診断装置として、例えば、零相変流器を用いたものがある。例えば、特許文献１参照。また、関連する技術として、例えば、特許文献２や特許文献３がある。 As an existing ground fault detection circuit diagnostic device, for example, there is one using a zero-phase current transformer. For example, see Patent Document 1. Further, as related techniques, for example, there are Patent Document 2 and Patent Document 3.
　ところで、電動フォークリフトなど、電動モータの動力を利用して駆動する車両の普及に伴い、車両に搭載される電池パック内の電池を充電するための技術の向上が図られている。 Incidentally, with the widespread use of vehicles driven by the power of electric motors such as electric forklifts, improvements in technology for charging batteries in battery packs mounted on vehicles have been attempted.
　また、そのような電池を充電するための充電器内の電力変換回路の出力段に設けられる地絡検知回路が正常であるか否かを診断することが望まれている。 Also, it is desired to diagnose whether or not the ground fault detection circuit provided at the output stage of the power conversion circuit in the charger for charging such a battery is normal.
特開２０００－０１９２１１号公報JP 2000-019211 A 特開平１０－２２１３９５号公報JP-A-10-221395 特開２０１５－０３２６０２号公報JP2015-032602A
　本発明の一側面に係る目的は、充電器内の電力変換回路の出力段に設けられる地絡検知回路が正常であるか否かを診断することが可能な地絡検知回路診断装置を提供することである。 The objective which concerns on one side of this invention provides the ground fault detection circuit diagnostic apparatus which can diagnose whether the ground fault detection circuit provided in the output stage of the power converter circuit in a charger is normal. That is.
　本発明に係る一つの形態である地絡検知回路診断装置は、抵抗と、地絡検知回路と、第１の地絡検知診断回路と、制御部とを備える。
　上記抵抗には、電力変換回路の出力側の給電線が地絡しているとき、第１の方向の電流が流れる。 A ground fault detection circuit diagnostic apparatus according to one embodiment of the present invention includes a resistor, a ground fault detection circuit, a first ground fault detection diagnostic circuit, and a control unit.
A current in the first direction flows through the resistor when the power supply line on the output side of the power conversion circuit is grounded.
　地絡検知回路は、抵抗に第１の方向の電流が流れると、給電線が地絡していることを検知する。
　第１の地絡検知診断回路は、抵抗に第１の方向の電流を流す。 The ground fault detection circuit detects that the power supply line is grounded when a current in the first direction flows through the resistor.
The first ground fault detection diagnostic circuit passes a current in the first direction through the resistor.
　制御部は、第１の地絡検知診断回路の動作を制御することにより抵抗に第１の方向の電流を流しているとき、地絡検知回路により給電線が地絡していることが検知されると、地絡検知回路が正常であると診断する。 When the control unit controls the operation of the first ground fault detection diagnostic circuit to pass a current in the first direction through the resistor, the ground fault detection circuit detects that the power supply line is grounded. Then, the ground fault detection circuit is diagnosed as normal.
　本発明によれば、充電器内の電力変換回路の出力段に設けられる地絡検知回路が正常であるか否かを診断することができる。 According to the present invention, it is possible to diagnose whether or not the ground fault detection circuit provided at the output stage of the power conversion circuit in the charger is normal.
実施形態の地絡検知回路診断装置が備えられる充電器の一例を示す図である。It is a figure which shows an example of the charger with which the ground fault detection circuit diagnostic apparatus of embodiment is provided. 地絡検知回路の正常診断時の制御部の動作の一例を示すフローチャートである。It is a flowchart which shows an example of operation | movement of the control part at the time of the normal diagnosis of a ground fault detection circuit. 電力変換回路の出力、＋‐ＰＥ間地絡発生信号、－‐ＰＥ間地絡発生信号、地絡検知回路診断信号、及び地絡検知回路診断終了信号の一例を示す図である。It is a figure which shows an example of the output of a power converter circuit, a ground fault generation signal between + -PE, a ground fault generation signal between --PE, a ground fault detection circuit diagnostic signal, and a ground fault detection circuit diagnosis end signal.
　以下図面に基づいて実施形態について詳細を説明する。
　図１は、実施形態の地絡検知回路診断装置が備えられる充電器の一例を示す図である。
　図１に示す充電器１０は、商用電源Ｐから供給される交流電力を直流電力に変換し、電池パック２０に供給する。 Hereinafter, embodiments will be described in detail with reference to the drawings.
Drawing 1 is a figure showing an example of a charger with which a ground fault detection circuit diagnostic device of an embodiment is provided.
The charger 10 shown in FIG. 1 converts AC power supplied from the commercial power source P into DC power and supplies it to the battery pack 20.
　電池パック２０は、例えば、電動フォークリフトなどの車両に搭載され、電池Ｂと、リレーＲｅと、制御部２１とを備える。
　電池Ｂは、例えば、複数のリチウムイオン電池により構成され、走行用モータを駆動するインバータ回路などの負荷に電力を供給する。 The battery pack 20 is mounted on a vehicle such as an electric forklift, for example, and includes a battery B, a relay Re, and a control unit 21.
The battery B is composed of, for example, a plurality of lithium ion batteries, and supplies power to a load such as an inverter circuit that drives a traveling motor.
　リレーＲｅは、例えば、機械式リレーまたはＭＯＳＦＥＴ（Metal Oxide Semiconductor Field Effect Transistor）などの半導体リレーにより構成され、電池Ｂのプラス端子またはマイナス端子に接続されている。 The relay Re is constituted by, for example, a mechanical relay or a semiconductor relay such as a MOSFET (Metal Oxide Semiconductor Semiconductor Field Field Effect Transistor), and is connected to the positive terminal or the negative terminal of the battery B.
　制御部２１は、例えば、ＣＰＵ（Central Processing Unit）またはプログラマブルデバイス（ＦＰＧＡ（Field Programmable Gate Array）やＰＬＤ（Programmable Logic Device）など）により構成され、リレーＲｅのオン、オフを制御する。 The control unit 21 is configured by, for example, a CPU (Central Processing Unit) or a programmable device (FPGA (Field Programmable Gate Array), PLD (Programmable Logic Device), etc.), and controls ON / OFF of the relay Re.
　充電器１０は、複数の電力変換回路１１と、抵抗Ｒ１と、地絡検知回路診断装置１２とを備える。
　各電力変換回路１１は、それぞれ、商用電源Ｐから供給される交流電力を直流電力に変換する。また、各電力変換回路１１は、互いに並列接続されている。すなわち、各電力変換回路１１のプラス出力端子はそれぞれプラス側給電線Ｌｐ（電力変換回路１１の出力側の給電線）に接続され、各電力変換回路１１のマイナス出力端子はそれぞれマイナス側給電線Ｌｎ（電力変換回路１１の出力側の給電線）に接続されている。マイナス側給電線Ｌｎは、ＹコンデンサＣを介して筐体接地ＦＧ（Frame Ground）に接続されている。筐体接地ＦＧは保護接地ＰＥ（Protective Earth）に接続されている。充電器１０と電池パック２０が充電コネクタや充電ケーブルなどを介して接続されると、各電力変換回路１１のプラス出力端子はそれぞれプラス側給電線Ｌｐ及びリレーＲｅを介して電池Ｂのプラス端子に接続され、各電力変換回路１１のマイナス出力端子はそれぞれマイナス側給電線Ｌｎを介して電池Ｂのマイナス端子に接続される。このとき、リレーＲｅがオンするとともに、各電力変換回路１１から電力が出力されると、電池Ｂへ電力が供給され電池Ｂが充電される。なお、図１では電力変換回路１１は２つだが、３つ以上並列接続されていてもよい。 The charger 10 includes a plurality of power conversion circuits 11, a resistor R1, and a ground fault detection circuit diagnostic device 12.
Each power conversion circuit 11 converts AC power supplied from the commercial power source P into DC power. The power conversion circuits 11 are connected in parallel to each other. That is, the plus output terminal of each power conversion circuit 11 is connected to the plus side power supply line Lp (the feed side power supply line of the power conversion circuit 11), and the minus output terminal of each power conversion circuit 11 is respectively the minus side feed line Ln. It is connected to (feed line on the output side of the power conversion circuit 11). The minus side power supply line Ln is connected to a housing ground FG (Frame Ground) via a Y capacitor C. The case ground FG is connected to a protective ground PE (Protective Earth). When the charger 10 and the battery pack 20 are connected via a charging connector or a charging cable, the plus output terminal of each power conversion circuit 11 is connected to the plus terminal of the battery B via the plus-side power supply line Lp and the relay Re, respectively. The negative output terminal of each power conversion circuit 11 is connected to the negative terminal of the battery B via the negative power supply line Ln. At this time, when relay Re is turned on and power is output from each power conversion circuit 11, power is supplied to battery B and battery B is charged. In FIG. 1, there are two power conversion circuits 11, but three or more power conversion circuits 11 may be connected in parallel.
　抵抗Ｒ１は、プラス側給電線Ｌｐとマイナス側給電線Ｌｎとの間に設けられ、各電力変換回路１１から出力される電力の合成後の電力に含まれるノイズ成分を低減する。
　地絡検知回路診断装置１２は、抵抗Ｒ２（第２の抵抗）と、抵抗Ｒ３（第３の抵抗）と、抵抗Ｒ４（抵抗）と、地絡検知回路１２１と、第１の地絡検知診断回路１２２と、第２の地絡検知診断回路１２３と、制御部１２４とを備える。 The resistor R1 is provided between the plus-side power supply line Lp and the minus-side power supply line Ln, and reduces a noise component included in the combined power output from each power conversion circuit 11.
The ground fault detection circuit diagnostic device 12 includes a resistor R2 (second resistor), a resistor R3 (third resistor), a resistor R4 (resistance), a ground fault detection circuit 121, and a first ground fault detection diagnosis. The circuit 122, the 2nd ground fault detection diagnostic circuit 123, and the control part 124 are provided.
　抵抗Ｒ２の一方端はプラス側給電線Ｌｐに接続され、抵抗Ｒ３の一方端はマイナス側給電線Ｌｎに接続され、抵抗Ｒ４の一方端は保護接地ＰＥに接続され、抵抗Ｒ２～Ｒ４のそれぞれの他方端は互いに接続されている。例えば、第１の地絡検知診断回路１２２及び第２の地絡検知診断回路１２３が動作していないときで、かつ、電力変換回路１１から電力が出力されているときに、プラス側給電線Ｌｐが地絡すると（プラス側給電線Ｌｐが保護接地ＰＥに短絡すると）、プラス側給電線Ｌｐから保護接地ＰＥ、抵抗Ｒ４、抵抗Ｒ２～Ｒ４の接続点ｐ、及び抵抗Ｒ３を介してマイナス側給電線Ｌｎへ電流が流れる。すなわち、第１の地絡検知診断回路１２２及び第２の地絡検知診断回路１２３が動作していないときで、かつ、電力変換回路１１から電力が出力されているときに、プラス側給電線Ｌｐが地絡すると、抵抗Ｒ４に第１の方向（保護接地ＰＥから抵抗Ｒ２～Ｒ４の接続点ｐへ向かう方向）の電流Ｉ１が流れる。また、例えば、第１の地絡検知診断回路１２２及び第２の地絡検知診断回路１２３が動作していないときで、かつ、電力変換回路１１から電力が出力されているときに、マイナス側給電線Ｌｎが地絡すると（マイナス側給電線Ｌｎが保護接地ＰＥに短絡すると）、プラス側給電線Ｌｐから抵抗Ｒ２、抵抗Ｒ２～Ｒ４の接続点ｐ、抵抗Ｒ４、及び保護接地ＰＥを介してマイナス側給電線Ｌｎへ電流が流れる。すなわち、第１の地絡検知診断回路１２２及び第２の地絡検知診断回路１２３が動作していないときで、かつ、電力変換回路１１から電力が出力されているときに、マイナス側給電線Ｌｎが地絡すると、抵抗Ｒ４に第１の方向とは逆方向の第２の方向（抵抗Ｒ２～Ｒ４の接続点ｐから保護接地ＰＥへ向かう方向）の電流Ｉ２が流れる。 One end of the resistor R2 is connected to the plus side feed line Lp, one end of the resistor R3 is connected to the minus side feed line Ln, one end of the resistor R4 is connected to the protective ground PE, and each of the resistors R2 to R4 is connected. The other ends are connected to each other. For example, when the first ground fault detection diagnostic circuit 122 and the second ground fault detection diagnostic circuit 123 are not operating and when power is output from the power conversion circuit 11, the positive side feed line Lp Is grounded (when the positive-side power supply line Lp is short-circuited to the protective ground PE), the negative-side power supply is supplied from the positive-side power supply line Lp via the protective ground PE, the resistor R4, the connection point p between the resistors R2 to R4, and the resistor R3. A current flows to the electric wire Ln. That is, when the first ground fault detection diagnostic circuit 122 and the second ground fault detection diagnostic circuit 123 are not operating and when power is output from the power conversion circuit 11, the positive side feed line Lp Causes a current I1 in the first direction (from the protective ground PE toward the connection point p of the resistors R2 to R4) to flow through the resistor R4. Further, for example, when the first ground fault detection diagnostic circuit 122 and the second ground fault detection diagnostic circuit 123 are not operating and when power is output from the power conversion circuit 11, the negative side supply is performed. When the electric wire Ln is grounded (when the negative side feed line Ln is short-circuited to the protective ground PE), the negative side of the positive side feed line Lp is connected via the resistor R2, the connection point p of the resistors R2 to R4, the resistor R4, and the protective ground PE. A current flows to the side power supply line Ln. That is, when the first ground fault detection diagnostic circuit 122 and the second ground fault detection diagnostic circuit 123 are not operating and when power is output from the power conversion circuit 11, the negative side feed line Ln Causes a current I2 in the second direction opposite to the first direction (the direction from the connection point p of the resistors R2 to R4 to the protective ground PE) to flow through the resistor R4.
　地絡検知回路１２１は、例えば、コンパレータやバイポーラトランジスタなどにより構成され、抵抗Ｒ４に第１の方向の電流Ｉ１または第２の方向の電流Ｉ２が流れると、各電力変換回路１１の出力側の給電線（プラス側給電線Ｌｐまたはマイナス側給電線Ｌｎ）が地絡していることを検知し、制御部１２４へ送る地絡検知回路検知信号Ｓｄｅｃをハイレベルからローレベルに変化させる。 The ground fault detection circuit 121 is configured by, for example, a comparator, a bipolar transistor, and the like. When the current I1 in the first direction or the current I2 in the second direction flows through the resistor R4, the power supply on the output side of each power conversion circuit 11 is supplied. It is detected that the electric wire (plus side feed line Lp or minus side feed line Ln) is grounded, and the ground fault detection circuit detection signal Sdec sent to the control unit 124 is changed from the high level to the low level.
　第１の地絡検知診断回路１２２は、フォトカプラＰｈ１（第１のフォトカプラ）と、スイッチング素子ＳＷ１とを備える。フォトカプラＰｈ１のフォトトランジスタのコレクタ端子はプラス側給電線Ｌｐに接続され、フォトカプラＰｈ１のフォトトランジスタのエミッタ端子は抵抗Ｒ４の一方端に接続されている。また、フォトカプラＰｈ１の発光ダイオードのアノード端子には所定電圧が印加されている。スイッチング素子ＳＷ１は、例えば、ＭＯＳＦＥＴであり、スイッチング素子ＳＷ１のドレイン端子はフォトカプラＰｈ１の発光ダイオードのカソード端子に接続され、スイッチング素子ＳＷ１のソース端子は筐体接地ＦＧに接続されている。例えば、スイッチング素子ＳＷ１のゲート端子に入力される＋‐ＰＥ間地絡開始信号Ｓ１がローレベルからハイレベルになり、スイッチング素子ＳＷ１がオンしてフォトカプラＰｈ１の発光ダイオードがオンすると、フォトカプラＰｈ１のフォトトランジスタがオンする。このとき、プラス側給電線Ｌｐ及びマイナス側給電線Ｌｎが地絡しておらず、電力変換回路１１から電力が出力されていると、プラス側給電線ＬｐからフォトカプラＰｈ１のフォトトランジスタ、抵抗Ｒ４、抵抗Ｒ２～Ｒ４の接続点ｐ、及び抵抗Ｒ３を介してマイナス側給電線Ｌｎへ電流が流れる。すなわち、プラス側給電線Ｌｐ及びマイナス側給電線Ｌｎが地絡しておらず、電力変換回路１１から電力が出力されているとき、フォトカプラＰｈ１がオンすると、抵抗Ｒ４に第１の方向の電流Ｉ１が流れる。なお、このとき、第２の地絡検知診断回路１２３は動作していないものとする。 The first ground fault detection diagnostic circuit 122 includes a photocoupler Ph1 (first photocoupler) and a switching element SW1. The collector terminal of the phototransistor of the photocoupler Ph1 is connected to the positive power supply line Lp, and the emitter terminal of the phototransistor of the photocoupler Ph1 is connected to one end of the resistor R4. A predetermined voltage is applied to the anode terminal of the light emitting diode of the photocoupler Ph1. The switching element SW1 is, for example, a MOSFET, the drain terminal of the switching element SW1 is connected to the cathode terminal of the light emitting diode of the photocoupler Ph1, and the source terminal of the switching element SW1 is connected to the housing ground FG. For example, when the + -PE ground fault start signal S1 input to the gate terminal of the switching element SW1 changes from low level to high level and the switching element SW1 is turned on to turn on the light emitting diode of the photocoupler Ph1, the photocoupler Ph1 is turned on. The phototransistor is turned on. At this time, if the plus-side feed line Lp and the minus-side feed line Ln are not grounded and power is output from the power conversion circuit 11, the phototransistor of the photocoupler Ph1 and the resistor R4 are output from the plus-side feed line Lp. Then, a current flows to the negative power supply line Ln through the connection point p of the resistors R2 to R4 and the resistor R3. That is, when the plus-side feed line Lp and the minus-side feed line Ln are not grounded and power is output from the power conversion circuit 11, when the photocoupler Ph1 is turned on, a current in the first direction flows through the resistor R4. I1 flows. At this time, it is assumed that the second ground fault detection diagnostic circuit 123 is not operating.
　第２の地絡検知診断回路１２３は、フォトカプラＰｈ２（第２のフォトカプラ）と、スイッチング素子ＳＷ２とを備える。フォトカプラＰｈ２のフォトトランジスタのコレクタ端子は抵抗Ｒ４の一方端に接続され、フォトカプラＰｈ１のフォトトランジスタのエミッタ端子はマイナス側給電線Ｌｎに接続されている。また、フォトカプラＰｈ２の発光ダイオードのアノード端子には所定電圧が印加されている。スイッチング素子ＳＷ２は、例えば、ＭＯＳＦＥＴであり、スイッチング素子ＳＷ２のドレイン端子はフォトカプラＰｈ２の発光ダイオードのカソード端子に接続され、スイッチング素子ＳＷ２のソース端子は筐体接地ＦＧに接続されている。例えば、スイッチング素子ＳＷ２のゲート端子に入力される－‐ＰＥ間地絡開始信号Ｓ２がローレベルからハイレベルになり、スイッチング素子ＳＷ２がオンしてフォトカプラＰｈ２の発光ダイオードがオンすると、フォトカプラＰｈ２のフォトトランジスタがオンする。このとき、プラス側給電線Ｌｐ及びマイナス側給電線Ｌｎが地絡しておらず、電力変換回路１１から電力が出力されていると、プラス側給電線Ｌｐから抵抗Ｒ２、抵抗Ｒ２～Ｒ４の接続点ｐ、抵抗Ｒ４、及びフォトカプラＰｈ２のフォトトランジスタを介してマイナス側給電線Ｌｎへ電流が流れる。すなわち、プラス側給電線Ｌｐ及びマイナス側給電線Ｌｎが地絡しておらず、電力変換回路１１から電力が出力されているとき、フォトカプラＰｈ２がオンすると、抵抗Ｒ４に第２の方向の電流Ｉ２が流れる。なお、このとき、第１の地絡検知診断回路１２２は動作していないものとする。 The second ground fault detection diagnostic circuit 123 includes a photocoupler Ph2 (second photocoupler) and a switching element SW2. The collector terminal of the phototransistor of the photocoupler Ph2 is connected to one end of the resistor R4, and the emitter terminal of the phototransistor of the photocoupler Ph1 is connected to the negative power supply line Ln. A predetermined voltage is applied to the anode terminal of the light emitting diode of the photocoupler Ph2. The switching element SW2 is, for example, a MOSFET, the drain terminal of the switching element SW2 is connected to the cathode terminal of the light emitting diode of the photocoupler Ph2, and the source terminal of the switching element SW2 is connected to the housing ground FG. For example, when the ground fault start signal S2 input to the gate terminal of the switching element SW2 changes from low level to high level and the switching element SW2 is turned on and the light emitting diode of the photocoupler Ph2 is turned on, the photocoupler Ph2 is turned on. The phototransistor is turned on. At this time, if the plus-side feed line Lp and the minus-side feed line Ln are not grounded and power is output from the power conversion circuit 11, the plus-side feed line Lp is connected to the resistors R2 and R2-R4. A current flows to the negative power supply line Ln via the point p, the resistor R4, and the phototransistor of the photocoupler Ph2. That is, when the plus-side feed line Lp and the minus-side feed line Ln are not grounded and power is being output from the power conversion circuit 11, when the photocoupler Ph2 is turned on, a current in the second direction flows through the resistor R4. I2 flows. At this time, it is assumed that the first ground fault detection diagnostic circuit 122 is not operating.
　制御部１２４は、例えば、ＣＰＵやプログラマブルデバイス（ＦＰＧＡまたはＰＬＤなど）により構成される。また、制御部１２４は、リレーＲｅをオンからオフにさせるための指示を電池パック２０の制御部２１に送る。制御部２１は、その指示を受け取ると、リレーＲｅをオンからオフに制御する。電池Ｂの充電中において、リレーＲｅがオンからオフになると、充電器１０のプラス側給電線Ｌｐ及びマイナス側給電線Ｌｎが開放される。また、制御部１２４は、電力変換回路１１から電力（電圧）を出力させるための指示を少なくとも１以上の電力変換回路１１に送る。電力変換回路１１はその指示を受け取ると、電力（電圧）を出力する。また、制御部１２４は、第１の地絡検知診断回路１２２の動作を制御することにより抵抗Ｒ４に第１の方向の電流Ｉ１を流す。また、制御部１２４は、第２の地絡検知診断回路１２３の動作を制御することにより抵抗Ｒ４に第２の方向の電流Ｉ２を流す。また、制御部１２４は、地絡検知回路検知信号Ｓｄｅｃがハイレベルからローレベルになると、地絡検知回路１２１により各電力変換回路１１の出力側の給電線が地絡していることが検知されたと判断する。また、制御部１２４は、第１の地絡検知診断回路１２２の動作を制御することにより抵抗Ｒ４に第１の方向の電流Ｉ１を流しているとき、地絡検知回路１２１により各電力変換回路１１の出力側の給電線が地絡していることが検知され、かつ、第２の地絡検知診断回路１２３の動作を制御することにより抵抗Ｒ４に第２の方向の電流Ｉ２を流しているとき、地絡検知回路１２１により各電力変換回路１１の出力側の給電線が地絡していることが検知されると、地絡検知回路１２１が正常であると診断する。 The control unit 124 is constituted by, for example, a CPU or a programmable device (FPGA or PLD). In addition, the control unit 124 sends an instruction for turning the relay Re from on to off to the control unit 21 of the battery pack 20. When receiving the instruction, the control unit 21 controls the relay Re from on to off. If the relay Re is turned off from on while the battery B is being charged, the positive side power supply line Lp and the negative side power supply line Ln of the charger 10 are opened. In addition, the control unit 124 sends an instruction for outputting power (voltage) from the power conversion circuit 11 to at least one power conversion circuit 11. When receiving the instruction, the power conversion circuit 11 outputs power (voltage). Further, the control unit 124 controls the operation of the first ground fault detection diagnostic circuit 122 to flow the current I1 in the first direction through the resistor R4. Further, the control unit 124 controls the operation of the second ground fault detection / diagnosis circuit 123 to flow the current I2 in the second direction through the resistor R4. Further, when the ground fault detection circuit detection signal Sdec changes from the high level to the low level, the control unit 124 detects that the power supply line on the output side of each power conversion circuit 11 is grounded by the ground fault detection circuit 121. Judge that In addition, the control unit 124 controls the operation of the first ground fault detection diagnostic circuit 122 to pass the current I1 in the first direction through the resistor R4. Is detected and the second ground fault detection diagnostic circuit 123 is controlled to pass a current I2 in the second direction through the resistor R4. When the ground fault detection circuit 121 detects that the power supply line on the output side of each power conversion circuit 11 is grounded, the ground fault detection circuit 121 is diagnosed as normal.
　図２は、地絡検知回路１２１の正常診断時の制御部１２４の動作の一例を示すフローチャートである。
　まず、制御部１２４は、充電器１０のプラス側給電線Ｌｐ及びマイナス側給電線Ｌｎを開放させ（Ｓ２１）、少なくとも１以上の電力変換回路１１から電力（電圧）を出力させる（Ｓ２２）。 FIG. 2 is a flowchart illustrating an example of the operation of the control unit 124 during normal diagnosis of the ground fault detection circuit 121.
First, the control unit 124 opens the positive power supply line Lp and the negative power supply line Ln of the charger 10 (S21), and outputs power (voltage) from at least one power conversion circuit 11 (S22).
　次に、制御部１２４は、第１の地絡検知診断回路１２２の動作を制御することにより抵抗Ｒ４に第１の方向の電流Ｉ１を流し（Ｓ２３）、地絡検知回路１２１により給電線の地絡が検知されているか否かを判断する（Ｓ２４）。 Next, the control unit 124 controls the operation of the first ground fault detection diagnostic circuit 122 to flow the current I1 in the first direction through the resistor R4 (S23), and the ground fault detection circuit 121 causes the ground of the feeder line to flow. It is determined whether or not a fault has been detected (S24).
　制御部１２４は、抵抗Ｒ４に第１の方向の電流Ｉ１を流しているとき、地絡検知回路１２１により給電線の地絡が検知されていないと判断すると（Ｓ２４：Ｎｏ）、地絡検知回路１２１が正常でない（地絡検知回路１２１が異常である）と診断する（Ｓ２５）。 When the control unit 124 determines that the ground fault of the feeder line is not detected by the ground fault detection circuit 121 when the current I1 in the first direction is flowing through the resistor R4 (S24: No), the ground fault detection circuit It is diagnosed that 121 is not normal (the ground fault detection circuit 121 is abnormal) (S25).
　一方、制御部１２４は、抵抗Ｒ４に第１の方向の電流Ｉ１を流しているとき、地絡検知回路１２１により給電線の地絡が検知されていると判断すると（Ｓ２４：Ｙｅｓ）、第２の地絡検知診断回路１２３の動作を制御することにより抵抗Ｒ４に第２の方向の電流Ｉ２を流し（Ｓ２６）、地絡検知回路１２１により給電線の地絡が検知されているか否かを判断する（Ｓ２７）。 On the other hand, when the control unit 124 determines that the ground fault of the feeder line is detected by the ground fault detection circuit 121 when the current I1 in the first direction is flowing through the resistor R4 (S24: Yes), the second By controlling the operation of the ground fault detection diagnostic circuit 123, the current I2 in the second direction is caused to flow through the resistor R4 (S26), and it is determined whether or not the ground fault of the feeder line is detected by the ground fault detection circuit 121. (S27).
　制御部１２４は、抵抗Ｒ４に第２の方向の電流Ｉ２を流しているとき、地絡検知回路１２１により給電線の地絡が検知されていないと判断すると（Ｓ２７：Ｎｏ）、地絡検知回路１２１が正常でない（地絡検知回路１２１が異常である）と診断する（Ｓ２５）。 When the control unit 124 determines that the ground fault of the feeder line is not detected by the ground fault detection circuit 121 when the current I2 in the second direction is flowing through the resistor R4 (S27: No), the ground fault detection circuit It is diagnosed that 121 is not normal (the ground fault detection circuit 121 is abnormal) (S25).
　一方、制御部１２４は、抵抗Ｒ４に第２の方向の電流Ｉ２を流しているとき、地絡検知回路１２１により給電線の地絡が検知されていると判断すると（Ｓ２７：Ｙｅｓ）、地絡検知回路１２１が正常であると診断する（Ｓ２８）。 On the other hand, when the control unit 124 determines that the ground fault of the feeder line is detected by the ground fault detection circuit 121 when the current I2 in the second direction is flowing through the resistor R4 (S27: Yes), the ground fault is detected. It is diagnosed that the detection circuit 121 is normal (S28).
　例えば、地絡検知回路１２１の正常診断時、制御部１２４は、リレーＲｅをオンからオフにさせるための指示を電池パック２０の制御部２１に送った後、電力変換回路１１から電力（電圧）を出力させるための指示を少なくとも１以上の電力変換回路１１に送る。すると、指示された電力変換回路１１から電力（電圧）が出力され、図３に示すように、時刻ｔ１において、プラス側給電線Ｌｐにかかる電圧Ｖｏｕｔがローレベルからハイレベルになる。 For example, at the time of normal diagnosis of the ground fault detection circuit 121, the control unit 124 sends an instruction for turning the relay Re from on to off to the control unit 21 of the battery pack 20, and then the power (voltage) from the power conversion circuit 11. Is sent to at least one power conversion circuit 11. Then, power (voltage) is output from the instructed power conversion circuit 11, and as shown in FIG. 3, the voltage Vout applied to the plus-side power supply line Lp changes from the low level to the high level at time t1.
　次に、制御部１２４は、図３に示すように、時刻ｔ２～時刻ｔ３において、＋‐ＰＥ間地絡開始信号Ｓ１をローレベルからハイレベルにする。すると、第１の地絡検知診断回路１２２のフォトカプラＰｈ１がオンして抵抗Ｒ４に第１の方向の電流Ｉ１が流れる。抵抗Ｒ４に第１の方向の電流Ｉ１が流れ、各電力変換回路１１の出力側の給電線が地絡していることを地絡検知回路１２１が検知すると、図３に示すように、地絡検知回路診断信号Ｓｄｅｃがハイレベルからローレベルになる。 Next, as shown in FIG. 3, the control unit 124 changes the + -PE ground fault start signal S1 from the low level to the high level from time t2 to time t3. Then, the photocoupler Ph1 of the first ground fault detection diagnostic circuit 122 is turned on, and the current I1 in the first direction flows through the resistor R4. When the ground fault detection circuit 121 detects that the current I1 in the first direction flows through the resistor R4 and the power supply line on the output side of each power conversion circuit 11 is grounded, as shown in FIG. The detection circuit diagnostic signal Sdec changes from the high level to the low level.
　次に、制御部１２４は、＋‐ＰＥ間地絡開始信号Ｓ１をハイレベルにしている期間（時刻ｔ２～時刻ｔ３）において、地絡検知回路診断信号Ｓｄｅｃがローレベルになると＋‐ＰＥ間地絡開始信号Ｓ１をハイレベルからローレベルへ戻し、所定時間経過後、図３に示すように、時刻ｔ４～時刻ｔ５において、－‐ＰＥ間地絡開始信号Ｓ２をローレベルからハイレベルにする。すると、第２の地絡検知診断回路１２２のフォトカプラＰｈ２がオンして抵抗Ｒ４に第２の方向の電流Ｉ２が流れる。抵抗Ｒ４に第２の方向の電流Ｉ２が流れることにより、各電力変換回路１１の出力側の給電線が地絡していることを地絡検知回路１２１が検知すると、図３に示すように、地絡検知回路診断信号Ｓｄｅｃがハイレベルからローレベルになる。 Next, when the ground fault detection circuit diagnostic signal Sdec becomes low level during the period (time t2 to time t3) during which the + -PE ground fault start signal S1 is at the high level, the control unit 124 The fault start signal S1 is returned from the high level to the low level, and after a predetermined time has elapsed, as shown in FIG. 3, the ground fault start signal S2 between --PE is changed from the low level to the high level from time t4 to time t5. Then, the photocoupler Ph2 of the second ground fault detection diagnostic circuit 122 is turned on, and the current I2 in the second direction flows through the resistor R4. When the ground fault detection circuit 121 detects that the power supply line on the output side of each power conversion circuit 11 is grounded by the current I2 flowing in the second direction through the resistor R4, as shown in FIG. The ground fault detection circuit diagnostic signal Sdec changes from the high level to the low level.
　そして、制御部１２４は、－‐ＰＥ間地絡開始信号Ｓ２をハイレベルにしている期間（時刻ｔ４～時刻ｔ５）において、地絡検知回路診断信号Ｓｄｅｃがローレベルになると、地絡検知回路１２１が正常であると診断し、図３に示すように、地絡検知回路診断終了信号をローレベルからハイレベルにする。電力変換回路１１は、地絡検知回路診断終了信号がローレベルからハイレベルになると、電力（電圧）の出力を停止する。すると、図３に示すように、電圧Ｖｏｕｔがハイレベルからローレベルになる。 When the ground fault detection circuit diagnostic signal Sdec becomes low level during the period (time t4 to time t5) during which the --PE ground fault start signal S2 is set to high level, the control unit 124 detects the ground fault detection circuit 121. As shown in FIG. 3, the ground fault detection circuit diagnosis end signal is changed from the low level to the high level. The power conversion circuit 11 stops outputting power (voltage) when the ground fault detection circuit diagnosis end signal changes from low level to high level. Then, as shown in FIG. 3, the voltage Vout changes from the high level to the low level.
　このように、実施形態の地絡検知回路診断装置１２では、各電力変換回路１１の出力側の給電線の開放時、第１の地絡検知診断回路１２２の動作を制御することにより抵抗Ｒ４に第１の方向の電流Ｉ１を流しているとき、地絡検知回路１２１により各電力変換回路１１の出力側の給電線が地絡していることが検知され、かつ、第２の地絡検知診断回路１２３の動作を制御することにより抵抗Ｒ４に第２の方向の電流Ｉ２を流しているとき、地絡検知回路１２１により各電力変換回路１１の出力側の給電線が地絡していることが検知されると、地絡検知回路１２１が正常であると診断している。すなわち、各電力変換回路１１の出力側の給電線の開放時、各電力変換回路１１の出力側の給電線を意図的に地絡させることで、地絡検知回路１２１が正常であるか否かを診断している。これにより、充電器１０内の各電力変換回路１１の出力段に設けられる地絡検知回路１２１が正常であるか否かを診断することができる。 As described above, in the ground fault detection circuit diagnostic device 12 according to the embodiment, the resistance R4 is controlled by controlling the operation of the first ground fault detection diagnostic circuit 122 when the output power supply line of each power conversion circuit 11 is opened. When the current I1 in the first direction is flowing, the ground fault detection circuit 121 detects that the power supply line on the output side of each power conversion circuit 11 is grounded, and the second ground fault detection diagnosis When the current I2 in the second direction is caused to flow through the resistor R4 by controlling the operation of the circuit 123, the ground fault detection circuit 121 may cause a ground fault on the output side of each power conversion circuit 11. When detected, the ground fault detection circuit 121 is diagnosed as normal. That is, whether or not the ground fault detection circuit 121 is normal by intentionally grounding the power supply line on the output side of each power conversion circuit 11 when the power supply line on the output side of each power conversion circuit 11 is opened. Is diagnosed. Thereby, it is possible to diagnose whether or not the ground fault detection circuit 121 provided at the output stage of each power conversion circuit 11 in the charger 10 is normal.
　また、実施形態の地絡検知回路診断装置１２は、各電力変換回路１１の出力側のプラス側給電線Ｌｐが互いに接続される点に第１の地絡検知診断回路１２２が接続され、各電力変換回路１１の出力側のマイナス側給電線Ｌｎが互いに接続される点に第２の地絡検知診断回路１２２が接続される構成、すなわち、複数の電力変換回路１１に対して１つの地絡検知回路診断装置１２を備える構成であるため、各電力変換回路１１にそれぞれ地絡検知回路診断装置を設ける場合に比べて、回路面積、コスト、及び地絡診断時間を削減することができる。 In the ground fault detection circuit diagnostic device 12 of the embodiment, the first ground fault detection diagnostic circuit 122 is connected to the point where the output power supply lines Lp on the output side of each power conversion circuit 11 are connected to each other. A configuration in which the second ground fault detection diagnostic circuit 122 is connected to the point where the negative side power supply lines Ln on the output side of the conversion circuit 11 are connected to each other, that is, one ground fault detection for a plurality of power conversion circuits 11. Since the circuit diagnosis device 12 is provided, the circuit area, cost, and ground fault diagnosis time can be reduced as compared with the case where each power conversion circuit 11 is provided with a ground fault detection circuit diagnostic device.
　また、本発明は、以上の実施の形態に限定されるものでなく、本発明の要旨を逸脱しない範囲内で種々の改良、変更が可能である。
　上記実施形態では、抵抗Ｒ４に第１の方向の電流Ｉ１を流している期間と、抵抗Ｒ４に第２の方向の電流Ｉ２を流している期間の両方の期間において、それぞれ、地絡検知回路１２１により地絡が検知されると、地絡検知回路１２１が正常であると制御部１２４が診断する構成であるが、抵抗Ｒ４に第１の方向の電流Ｉ１が流れている期間のみにおいて、地絡検知回路１２１により地絡が検知されると、地絡検知回路１２１が正常であると制御部１２４が診断するように構成してもよい。このように構成しても、充電器１０の出力段に設けられる地絡検知回路１２１が正常であるか否かを診断することができる。また、このように構成する場合、第２の地絡検知診断回路１２３を省略することができ、その分、回路面積、コスト、及び地絡診断時間を削減することができる。 The present invention is not limited to the above-described embodiment, and various improvements and modifications can be made without departing from the gist of the present invention.
In the above embodiment, the ground fault detection circuit 121 is provided in both the period in which the current I1 in the first direction flows through the resistor R4 and the period in which the current I2 in the second direction flows through the resistor R4. When the ground fault is detected by the control unit 124, the control unit 124 diagnoses that the ground fault detection circuit 121 is normal. However, only when the current I1 in the first direction flows through the resistor R4, the ground fault is detected. When the ground fault is detected by the detection circuit 121, the control unit 124 may diagnose that the ground fault detection circuit 121 is normal. Even if comprised in this way, it can be diagnosed whether the ground fault detection circuit 121 provided in the output stage of the charger 10 is normal. Moreover, when comprised in this way, the 2nd ground fault detection diagnostic circuit 123 can be abbreviate | omitted, and a circuit area, cost, and ground fault diagnostic time can be reduced by that much.
　また、上記実施形態では、電池パック２０に設けられるリレーＲｅをオフすることにより、充電器１０のプラス側給電線Ｌｐ及びマイナス側給電線Ｌｎが開放される構成であるが、充電器１０のプラス側給電線Ｌｐ上にリレーを設け、そのリレーを制御部１２４によりオンからオフに制御することで、プラス側給電線Ｌｐ及びマイナス側給電線Ｌｎが開放されるように構成してもよい。 Further, in the above embodiment, the positive power supply line Lp and the negative power supply line Ln of the charger 10 are opened by turning off the relay Re provided in the battery pack 20. A relay may be provided on the side power supply line Lp, and the relay may be controlled from on to off by the control unit 124 so that the plus side power supply line Lp and the minus side power supply line Ln are opened.
　また、上記実施形態では、充電器１０に複数の電力変換回路１１を備える構成であるが、充電器１０に１つの電力変換回路１１のみ備える構成でもよい。
　また、上記実施形態では、地絡検知回路１２１が給電線の地絡を検知すると地絡検知回路診断信号Ｓｄｅｃがハイレベルからローレベルになる構成であるが、地絡検知回路診断信号Ｓｄｅｃがローレベルからハイレベルになる構成でもよい。 Moreover, in the said embodiment, although it is the structure provided with the some power converter circuit 11 in the charger 10, the structure provided only with one power converter circuit 11 in the charger 10 may be sufficient.
In the above-described embodiment, when the ground fault detection circuit 121 detects a ground fault of the feeder line, the ground fault detection circuit diagnostic signal Sdec is changed from the high level to the low level. However, the ground fault detection circuit diagnostic signal Sdec is low. A configuration in which the level is changed to a high level may be used.
１０　充電器
１１　電力変換回路
１２　地絡検知回路診断装置
１２１　地絡検知回路
１２２　第１の地絡検知診断回路
１２３　第２の地絡検知診断回路
１２４　制御部
Ｒ１～Ｒ４　抵抗
  DESCRIPTION OF SYMBOLS 10 Charger 11 Power conversion circuit 12 Ground fault detection circuit diagnostic apparatus 121 Ground fault detection circuit 122 1st ground fault detection diagnostic circuit 123 2nd ground fault detection diagnostic circuit 124 Control part R1-R4 Resistance

Claims (5)

  1. 　電力変換回路の出力側の給電線が地絡しているとき、第１の方向の電流が流れる抵抗と、
    　前記抵抗に前記第１の方向の電流が流れると、前記給電線が地絡していることを検知する地絡検知回路と、
    　前記抵抗に前記第１の方向の電流を流す第１の地絡検知診断回路と、
    　前記第１の地絡検知診断回路の動作を制御することにより前記抵抗に前記第１の方向の電流を流しているとき、前記地絡検知回路により前記給電線が地絡していることが検知されると、前記地絡検知回路が正常であると診断する制御部と、
    　を備えることを特徴とする地絡検知回路診断装置。     When the power supply line on the output side of the power conversion circuit has a ground fault, a resistance through which a current in the first direction flows;
    When a current in the first direction flows through the resistor, a ground fault detection circuit that detects that the feed line is grounded;
    A first ground fault detection diagnostic circuit for passing a current in the first direction through the resistor;
    By controlling the operation of the first ground fault detection diagnostic circuit, it is detected by the ground fault detection circuit that the feeder line is grounded when a current in the first direction flows through the resistor. A controller that diagnoses that the ground fault detection circuit is normal;
    A ground fault detection circuit diagnostic apparatus comprising:
  2. 　請求項１に記載の地絡検知回路診断装置であって、
    　前記第１の地絡検知診断回路は、複数の電力変換回路の出力側の給電線が互いに接続される点に接続されている
    　ことを特徴とする地絡検知回路診断装置。     The ground fault detection circuit diagnostic device according to claim 1,
    The first ground fault detection diagnostic circuit is connected to a point where power supply lines on the output side of a plurality of power conversion circuits are connected to each other.
  3. 　請求項１または請求項２に記載の地絡検知回路診断装置であって、
    　前記抵抗に前記第１の方向と逆方向の第２の方向の電流を流す第２の地絡検知診断回路を備え、
    　前記抵抗は、前記給電線が地絡しているとき、前記第１の方向の電流または前記第２の方向の電流が流れ、
    　前記地絡検知回路は、前記抵抗に前記第１の方向の電流または前記第２の方向の電流が流れると、前記給電線が地絡していることを検知し、
    　前記制御部は、前記第１の地絡検知診断回路の動作を制御することにより前記抵抗に前記第１の方向の電流を流しているとき、前記地絡検知回路により前記給電線が地絡していることが検知され、かつ、前記第２の地絡検知診断回路の動作を制御することにより前記抵抗に前記第２の方向の電流を流しているとき、前記地絡検知回路により前記給電線が地絡していることが検知されると、前記地絡検知回路が正常であると診断する
    　ことを特徴とする地絡検知回路診断装置。     The ground fault detection circuit diagnostic device according to claim 1 or 2,
    A second ground fault detection diagnostic circuit for causing a current in a second direction opposite to the first direction to flow through the resistor;
    The resistor has a current in the first direction or a current in the second direction when the power supply line is grounded,
    When the current in the first direction or the current in the second direction flows through the resistor, the ground fault detection circuit detects that the power supply line is grounded,
    The control unit controls the operation of the first ground fault detection diagnostic circuit, and when the current in the first direction flows through the resistor, the ground fault detection circuit causes the power supply line to ground. And when the current in the second direction flows through the resistor by controlling the operation of the second ground fault detection diagnostic circuit, the ground fault detection circuit causes the feeder line to When it is detected that a ground fault is detected, the ground fault detection circuit is diagnosed as normal.
  4. 　請求項３に記載の地絡検知回路診断装置であって、
    　前記第２の地絡検知診断回路は、複数の電力変換回路の出力側の給電線が互いに接続される点に接続されている
    　ことを特徴とする地絡検知回路診断装置。     The ground fault detection circuit diagnostic device according to claim 3,
    The second ground fault detection diagnostic circuit is connected to a point where output power supply lines of a plurality of power conversion circuits are connected to each other.
  5. 　請求項３に記載の地絡検知回路診断装置であって、
    　第２及び第３の抵抗を備え、
    　前記第１の地絡検知診断回路は、第１のフォトカプラを備え、
    　前記第２の地絡検知診断回路は、第２のフォトカプラを備え、
    　前記抵抗の一方端は、前記第１のフォトカプラのフォトトランジスタのエミッタ端子、前記第２のフォトカプラのフォトトランジスタのコレクタ端子、及び保護接地に接続され、
    　前記第２の抵抗の一方端及び前記第１のフォトカプラのフォトトランジスタのコレクタ端子は、前記電力変換回路のプラス出力端子に接続されるプラス側給電線に接続され、
    　前記第３の抵抗の一方端及び前記第２のフォトカプラのフォトトランジスタのエミッタ端子は、前記電力変換回路のマイナス出力端子に接続されるマイナス側給電線に接続され、
    　前記抵抗、前記第２の抵抗、及び前記第３の抵抗のそれぞれの他方端は、互いに接続され、
    　前記制御部は、前記第１のフォトカプラをオンさせることにより前記抵抗に前記第１の方向の電流を流しているとき、前記地絡検知回路により前記給電線が地絡していることが検知され、かつ、前記第２のフォトカプラをオンさせることにより前記抵抗に前記第２の方向の電流を流しているとき、前記地絡検知回路により前記給電線が地絡していることが検知されると、前記地絡検知回路が正常であると診断する
    　ことを特徴とする地絡検知回路診断装置。
          The ground fault detection circuit diagnostic device according to claim 3,
    Comprising second and third resistors;
    The first ground fault detection and diagnosis circuit includes a first photocoupler,
    The second ground fault detection diagnostic circuit includes a second photocoupler,
    One end of the resistor is connected to an emitter terminal of the phototransistor of the first photocoupler, a collector terminal of the phototransistor of the second photocoupler, and a protective ground,
    One end of the second resistor and the collector terminal of the phototransistor of the first photocoupler are connected to a positive power supply line connected to a positive output terminal of the power conversion circuit,
    One end of the third resistor and the emitter terminal of the phototransistor of the second photocoupler are connected to a negative power supply line connected to a negative output terminal of the power conversion circuit,
    The other ends of the resistor, the second resistor, and the third resistor are connected to each other,
    The control unit detects that the power supply line is grounded by the ground fault detection circuit when a current in the first direction flows through the resistor by turning on the first photocoupler. When the second photocoupler is turned on, and the current in the second direction flows through the resistor, the ground fault detection circuit detects that the power supply line is grounded. Then, the ground fault detection circuit diagnosis apparatus characterized in that the ground fault detection circuit is diagnosed as normal.
PCT/JP2016/085768 2016-03-30 2016-12-01 Ground fault detection circuit diagnosing device WO2017168835A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10221395A (en) * 1997-02-07 1998-08-21 Denso Corp System for detecting ground fault of electric vehicle
JP2013061216A (en) * 2011-09-13 2013-04-04 Denso Corp Earth detector
JP2015162908A (en) * 2014-02-26 2015-09-07 住友電気工業株式会社 DC voltage supply circuit and ground fault detection circuit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10221395A (en) * 1997-02-07 1998-08-21 Denso Corp System for detecting ground fault of electric vehicle
JP2013061216A (en) * 2011-09-13 2013-04-04 Denso Corp Earth detector
JP2015162908A (en) * 2014-02-26 2015-09-07 住友電気工業株式会社 DC voltage supply circuit and ground fault detection circuit

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