WO2017168835A1 - Dispositif de diagnostic de circuit de détection de défaut de mise à la terre - Google Patents

Dispositif de diagnostic de circuit de détection de défaut de mise à la terre 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
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English (en)
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
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 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/fr

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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

L'invention concerne un dispositif de diagnostic de circuit de détection de défaut de mise à la terre (12) qui est configuré pour comprendre : une résistance (R4) à travers laquelle un courant électrique (I1) circule dans une première direction lorsqu'une ligne d'alimentation électrique côté positif (Lp) sur le côté de sortie d'un circuit de conversion électrique (11) est mise à la terre ; un circuit de détection de défaut de mise à la terre (121) qui, lorsque le courant électrique circule dans la première direction à travers la résistance (R4), détecte que la ligne d'alimentation électrique côté positif (Lp) ou une ligne d'alimentation électrique côté négatif (Ln) est mise à la terre ; un premier circuit de diagnostic de détection de défaut de mise à la terre (122) qui amène le courant électrique (I1) à circuler dans la première direction à travers la résistance (R4) ; et une unité de commande (124) qui, lorsque le circuit de détection de défaut de mise à la terre (121) détecte que la ligne d'alimentation électrique côté positif (Lp) ou la ligne d'alimentation électrique côté négatif (Ln) est mise à la terre tandis qu'une opération du premier circuit de diagnostic de détection de défaut de mise à la terre (122) est commandée de façon à amener le courant électrique (I1) à circuler dans la première direction à travers la résistance (R4), diagnostique que le circuit de détection de défaut de mise à la terre (121) est normal.
PCT/JP2016/085768 2016-03-30 2016-12-01 Dispositif de diagnostic de circuit de détection de défaut de mise à la terre WO2017168835A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2016-068442 2016-03-30
JP2016068442A JP2017181288A (ja) 2016-03-30 2016-03-30 地絡検知回路診断装置

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WO2017168835A1 true WO2017168835A1 (fr) 2017-10-05

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PCT/JP2016/085768 WO2017168835A1 (fr) 2016-03-30 2016-12-01 Dispositif de diagnostic de circuit de détection de défaut de mise à la terre

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WO (1) WO2017168835A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10221395A (ja) * 1997-02-07 1998-08-21 Denso Corp 電気自動車の地絡検知システム
JP2013061216A (ja) * 2011-09-13 2013-04-04 Denso Corp 地絡検出装置
JP2015162908A (ja) * 2014-02-26 2015-09-07 住友電気工業株式会社 直流電圧供給回路および地絡検出回路

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10221395A (ja) * 1997-02-07 1998-08-21 Denso Corp 電気自動車の地絡検知システム
JP2013061216A (ja) * 2011-09-13 2013-04-04 Denso Corp 地絡検出装置
JP2015162908A (ja) * 2014-02-26 2015-09-07 住友電気工業株式会社 直流電圧供給回路および地絡検出回路

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