CN105510839B - Battery insulation measuring circuit of electric automobile - Google Patents

Battery insulation measuring circuit of electric automobile Download PDF

Info

Publication number
CN105510839B
CN105510839B CN201510965868.XA CN201510965868A CN105510839B CN 105510839 B CN105510839 B CN 105510839B CN 201510965868 A CN201510965868 A CN 201510965868A CN 105510839 B CN105510839 B CN 105510839B
Authority
CN
China
Prior art keywords
circuit
resistor
relay
electric automobile
battery
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201510965868.XA
Other languages
Chinese (zh)
Other versions
CN105510839A (en
Inventor
沈翠凤
裴玉兵
彭思敏
陈冲
朱学来
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yancheng Institute of Technology
Original Assignee
Yancheng Institute of Technology
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 Yancheng Institute of Technology filed Critical Yancheng Institute of Technology
Priority to CN201510965868.XA priority Critical patent/CN105510839B/en
Publication of CN105510839A publication Critical patent/CN105510839A/en
Application granted granted Critical
Publication of CN105510839B publication Critical patent/CN105510839B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/1227Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/25Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/382Arrangements for monitoring battery or accumulator variables, e.g. SoC

Abstract

The invention discloses an electric vehicle battery insulation measuring circuit. The circuit includes: the device comprises a positive and negative electrode insulation measurement switching circuit (1), a constant current source circuit (2), a singlechip voltage measurement and control circuit (3) and a CAN communication module (4). The positive and negative electrode insulation measurement switching circuit (1) is connected with the constant current source circuit (2), the constant current source circuit (2) is connected with the single chip microcomputer voltage measurement and control circuit (3), the single chip microcomputer voltage measurement and control circuit (3) is connected with the CAN communication module (4), and the positive and negative electrode insulation measurement switching circuit (1) is controlled by the single chip microcomputer voltage measurement and control circuit (3). The invention can more accurately measure the leakage current value of the battery of the electric automobile by utilizing the high-voltage and constant-current source circuit of the battery of the electric automobile, and simplifies the design of the insulation leakage current measuring circuit of the battery of the electric automobile. The invention has low cost and wide application range.

Description

Battery insulation measuring circuit of electric automobile
Technical Field
The invention relates to an insulation leakage current measuring circuit between a shell and an internal direct current medium-voltage and high-voltage system of an electric automobile, a hybrid electric vehicle, a railway electric locomotive, power electronic equipment and the like.
Background
Medium and high voltage power supply systems are generally available in systems such as electric automobiles, hybrid vehicles, railway electric locomotives, power electronic equipment and the like, and provide electric energy for high-power components of the vehicles. The medium and high voltage power supply system mainly comprises power batteries, a power supply converter, a motor and other electrical equipment. The voltage of the power battery is usually above 48V, and some even up to above 450V. Higher operating voltages place higher demands on the insulation properties between the vehicle chassis and the medium and high voltage power supply systems. The moisture of the air, the aging of the insulating medium and other factors can cause the insulation performance between the medium and high voltage power supply system and the vehicle chassis to be reduced. The reduction of the insulating property enables the positive and negative leads of the power supply to form a leakage current loop between the insulating layer and the chassis, which not only can affect the normal operation of a vehicle electrical system, but also can endanger the safety of passengers, and can seriously cause the consequences of vehicle electrical fire and the like. Therefore, the method can detect the insulation leakage current of the medium and high voltage electrical systems and the vehicle chassis in real time and quantitatively, find insulation faults and has important significance for ensuring the normal work of the vehicle electrical systems, the vehicle safety and the passenger safety.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the defects that in the prior art, the precision of measuring the insulation leakage current of a direct-current high-voltage system through a megger is not high, potential safety hazards exist in manual operation, other circuits are complex and the like are overcome. The constant current source circuit generates leakage current of 0 milliampere to 10 milliampere, and insulation leakage current of medium and high voltage electrical systems and a vehicle chassis is quantitatively detected and insulation faults are found in real time through measurement and control of the single chip microcomputer. But also CAN be fused with a CAN bus system.
The invention adopts the following technical scheme for solving the technical problems:
the invention relates to an electric vehicle battery insulation measuring circuit, which comprises: the device comprises a positive and negative electrode insulation measurement switching circuit (1), a constant current source circuit (2), a singlechip voltage measurement and control circuit (3) and a CAN communication module (4). The positive and negative electrode insulation measurement switching circuit (1) is connected with the constant current source circuit (2), the constant current source circuit (2) is connected with the single chip microcomputer voltage measurement and control circuit (3), the single chip microcomputer voltage measurement and control circuit (3) is connected with the CAN communication module (4), and the positive and negative electrode insulation measurement switching circuit (1) is controlled by the single chip microcomputer voltage measurement and control circuit (3).
The invention is periodically switched and detected by a positive and negative electrode insulation measurement switching circuit (1): the leakage between the positive electrode or the negative electrode of the battery of the electric automobile and the chassis of the automobile; the high voltage of the battery of the electric automobile is utilized to generate the leakage current of the battery of the electric automobile from 0 milliampere to 10 milliampere by the constant current source circuit (2), the leakage current is changed into a voltage signal by a first resistor (R20) in the constant current source circuit (2), and the leakage current value of the battery of the electric automobile is accurately measured by the voltage measuring and controlling circuit (3) of the single chip microcomputer; the CAN communication module (4) is fused with a CAN bus system, and the leakage current value between the battery of the electric automobile and the vehicle chassis is sent to an instrument console, so that the design of the battery insulation measuring circuit of the electric automobile is simplified.
Preferably, the single-chip microcomputer voltage measuring and controlling circuit (3) adopts a N79E8132A single-chip microcomputer for detection and control.
Preferably, the transceiver of the CAN communication module (4) adopts a TJA1050 chip.
The technical scheme adopted by the invention has the following beneficial effects:
the defects of low precision and potential safety hazard of manually measuring the insulation leakage current of the direct-current high-voltage system by using a megohmmeter are overcome; the design of an electric vehicle battery insulation measuring circuit is simplified; the method is adaptive to the measurement of the insulation leakage current of various direct-current high-voltage systems.
Drawings
FIG. 1 is a circuit configuration diagram of the present invention.
Fig. 2 is a schematic circuit diagram of the positive and negative electrode insulation measurement switching circuit (1) of the present invention.
Fig. 3 is a circuit schematic diagram of the constant current source circuit (2) of the present invention.
Fig. 4 is a circuit schematic diagram of the voltage measuring and controlling circuit (3) of the single chip microcomputer.
Detailed Description
The invention relates to an electric vehicle battery insulation measuring circuit, which comprises the following components in a drawing 1: the device comprises a positive and negative electrode insulation measurement switching circuit (1), a constant current source circuit (2), a singlechip voltage measurement and control circuit (3) and a CAN communication module (4). The positive and negative electrode insulation measurement switching circuit (1) is connected with the constant current source circuit (2), the constant current source circuit (2) is connected with the single chip microcomputer voltage measurement and control circuit (3), the single chip microcomputer voltage measurement and control circuit (3) is connected with the CAN communication module (4), and the positive and negative electrode insulation measurement switching circuit (1) is controlled by the single chip microcomputer voltage measurement and control circuit (3).
The positive and negative pole insulation measurement switching circuit (1) in fig. 2 consists of two relays (J1, J2). The normally closed contact of the relay (J1) is connected with the positive electrode of the battery of the electric automobile; the normally open contact of the relay (J1) is connected with the normally closed contact of the relay (J2) and an electric automobile chassis; the normally open contact of the relay (J2) is connected with the negative electrode of the battery of the electric automobile; the movable contact of the relay (J1) is connected with the anode of a diode D20 in the constant current source circuit (2); the movable contact of the relay (J2) is connected with the negative electrode of the battery insulation measuring circuit of the electric automobile; one ends of coils of the two relays (J1 and J2) are connected with +15V of a power supply, the other ends of the coils are respectively connected with the collectors of BG20 and BG21 in the single-chip microcomputer voltage measuring and controlling circuit (3), and the contact switching of the two relays (J1 and J2) is controlled by the single-chip microcomputer voltage measuring and controlling circuit (3).
The constant current source circuit (2) shown in fig. 3 is composed of a diode D20, a field effect transistor Q20, an operational amplifier IC20, and first to fourth resistors (R20, R21, R22, R23). The anode of the diode D20 is connected with the movable contact of a relay (J1) of the positive and negative insulation measurement switching circuit (1), and the cathode is connected with the drain of a field effect transistor Q20; the source electrode of the field effect transistor Q20 is connected with the first resistor (R20), the negative input end of the operational amplifier IC20 and the singlechip voltage measuring and controlling circuit (3), the drain electrode is connected with the cathode of the diode D20, and the grid electrode is connected with the fourth resistor (R23) and the output end of the operational amplifier IC 20; the positive input end of the operational amplifier IC20 is connected with one end of a second resistor (R21) and one end of a third resistor (R22), the negative input end of the operational amplifier IC20 is connected with one end of a first resistor (R20), the source electrode of the field-effect tube Q20 and the single-chip microcomputer voltage measurement and control circuit (3), and the output end of the operational amplifier IC20 is connected with the grid electrode of the field-effect tube Q20 and one end of a fourth resistor (R23); one end of the first resistor (R20) is connected with the source electrode of the field-effect transistor Q20, the negative input end of the operational amplifier IC20 and the voltage measuring and controlling circuit (3) of the single chip microcomputer, and the other end of the first resistor is connected with the negative electrode of the battery insulation measuring circuit of the electric automobile; one end of the second resistor (R21) is connected with the positive input end of the operational amplifier IC20 and one end of the third resistor (R22), and the other end of the second resistor (R21) is connected with the negative electrode of the battery insulation measuring circuit of the electric automobile; one end of a third resistor (R22) is connected with the positive input end of the operational amplifier IC20 and one end of a second resistor (R21), and the other end of the third resistor is connected with the positive electrode of the battery insulation measuring circuit of the electric automobile by 15V; one end of a fourth resistor (R23) is connected with the output end of the operational amplifier IC20 and the drain electrode of the field effect transistor Q20, and the other end of the fourth resistor is connected with the positive electrode of the battery insulation measuring circuit of the electric automobile by 15 volts.
The voltage measuring and controlling circuit (3) of the single chip microcomputer shown in fig. 4 is composed of a single chip microcomputer N79E8132A, a triode BG20, a triode BG21, a fifth resistor (R24) and a sixth resistor (R25). The collectors of the triodes BG20 and BG21 are respectively connected with one ends of coils of two relays (J1 and J2) of the positive and negative electrode insulation measurement switching circuit (1), emitters of the triodes BG20 and BG21 are connected with the negative electrode of the insulation measurement circuit of the electric automobile battery, bases of the triodes BG20 and BG21 are connected with the output of the singlechip N79E8132A, the singlechip N79E8132A controls the two relays (J1 and J2) of the positive and negative electrode insulation measurement switching circuit (1) through the triodes BG20 and BG21, and the leakage condition between the positive electrode or the negative electrode of the electric automobile battery and a vehicle chassis is periodically measured.
With reference to fig. 2-4: when two relays (J1, J2) of the positive and negative electrode insulation measurement switching circuit (1) are in a release state, the current of the positive electrode of the battery of the electric automobile flows into a chassis of the electric automobile through the relay (J1), the diode D20, the Q20, the R20 and the relay (J2), if the chassis of the electric automobile and the negative electrode of the battery of the electric automobile leak electricity, a current loop is generated, the current is limited by the field effect tube Q20, so that the current does not exceed 10 milliamperes of the national standard, the current value is converted into a voltage value by the R20, the voltage value is read by the singlechip N79E8132A, and the leakage current value between the negative electrode of the battery of the electric automobile and the chassis of the electric automobile is sent to an instrument console through the fusion of the CAN communication module (4) and. When two relays (J1, J2) of the positive and negative electrode insulation measurement switching circuit (1) are in a suction state, the leakage current value between the positive electrode of the battery of the electric automobile and the chassis of the automobile can be sent to an instrument console. The staff can see the electric leakage condition between electric automobile battery and the vehicle chassis in real time in the driver's cabin, in time discovers vehicle electrical system potential safety hazard, guarantees passenger's safety of taking a bus.

Claims (1)

1. The utility model provides an electric automobile battery insulation measurement circuit which characterized in that: the device comprises a positive electrode insulation measurement switching circuit (1), a negative electrode insulation measurement switching circuit (1), a constant current source circuit (2), a single chip microcomputer voltage measurement and control circuit (3) and a CAN communication module (4), wherein the positive electrode insulation measurement switching circuit (1) and the negative electrode insulation measurement switching circuit (2) are connected with the constant current source circuit (2), the constant current source circuit (2) is connected with the single chip microcomputer voltage measurement and control circuit (3), the single chip microcomputer voltage measurement and control circuit (3) is connected with the CAN communication module (4), and the positive electrode insulation measurement switching circuit (1) and the negative electrode insulation measurement switching circuit (1) are controlled by the single chip microcomputer voltage measurement and control circuit (3);
the positive and negative electrode insulation measurement switching circuit (1) consists of a relay J1 and a relay J2, and a normally closed contact of the relay J1 is connected with the positive electrode of the battery of the electric automobile; the normally open contact of the relay J1 is connected with the normally closed contact of the relay J2 and a chassis of an electric automobile; the normally open contact of the relay J2 is connected with the negative electrode of the battery of the electric automobile; the movable contact of the relay J1 is connected with the anode of a diode (D20) in the constant current source circuit (2); the movable contact of the relay J2 is connected with the negative electrode of the battery insulation measuring circuit of the electric automobile; one ends of coils of the relay J1 and the relay J2 are connected with +15V of a power supply, the other ends of the coils are respectively connected with a triode BG20 and a collector of a triode BG21 in the singlechip voltage measuring and controlling circuit (3), and the contact switching of the relay J1 and the relay J2 is controlled by the singlechip voltage measuring and controlling circuit (3);
the constant current source circuit (2) consists of a diode (D20), a field effect transistor (Q20), an operational amplifier (IC20) and first to fourth resistors (R20, R21, R22 and R23), wherein the anode of the diode (D20) is connected with a movable contact of a relay J1 of the positive and negative insulation measurement switching circuit (1), and the cathode of the diode is connected with the drain of the field effect transistor (Q20); the source electrode of the field effect transistor (Q20) is connected with the first resistor (R20), the negative input end of the operational amplifier (IC20) and the single chip microcomputer voltage measuring and controlling circuit (3), the drain electrode of the field effect transistor is connected with the cathode of the diode (D20), and the grid electrode of the field effect transistor is connected with the fourth resistor (R23) and the output end of the operational amplifier (IC 20); the positive input end of the operational amplifier (IC20) is connected with one end of a second resistor (R21) and one end of a third resistor (R22), the negative input end of the operational amplifier (IC20) is connected with one end of a first resistor (R20), the source electrode of the field-effect tube (Q20) and the single-chip microcomputer voltage measuring and controlling circuit (3), and the output end of the operational amplifier (IC20) is connected with the grid electrode of the field-effect tube (Q20) and one end of a fourth resistor (R23); one end of the first resistor (R20) is connected with a source electrode of the field effect transistor (Q20), a negative input end of the operational amplifier (IC20) and the voltage measurement and control circuit (3) of the single chip microcomputer, and the other end of the first resistor is connected with a negative electrode of the battery insulation measurement circuit of the electric automobile; one end of the second resistor (R21) is connected with the positive input end of the operational amplifier (IC20) and one end of the third resistor (R22), and the other end of the second resistor (R21) is connected with the negative electrode of the battery insulation measuring circuit of the electric automobile; one end of a third resistor (R22) is connected with the positive input end of an operational amplifier (IC20) and one end of a second resistor (R21), and the other end of the third resistor is connected with the positive electrode of the battery insulation measuring circuit of the electric automobile by 15V; one end of a fourth resistor (R23) is connected with the output end of the operational amplifier (IC20) and the drain electrode of the field effect transistor (Q20), and the other end of the fourth resistor is connected with the anode of the battery insulation measuring circuit of the electric automobile by 15V;
the single-chip microcomputer voltage measuring and controlling circuit (3) consists of a single-chip microcomputer N79E8132A, a triode BG20, a triode BG21, a fifth resistor (R24) and a sixth circuit (R25); the collector electrodes of a triode BG20 and a triode BG21 are respectively connected with one end of a relay J1 and one end of a relay J2 coil of a positive and negative insulation measurement switching circuit (1), the emitter electrodes of the triode BG20 and the triode BG21 are connected with the negative electrode of an electric vehicle battery insulation measurement circuit, the base electrodes of the triode BG20 and the triode BG21 are connected with the output of a singlechip N79E8132A, the singlechip N79E8132A controls the relay J1 and the relay J2 of the positive and negative insulation measurement switching circuit (1) through the triode BG20 and the triode BG21, and the leakage condition between the positive electrode or the negative electrode of the electric vehicle battery and a vehicle chassis is periodically measured;
when two relays J1 and J2 of the positive and negative electrode insulation measurement switching circuit (1) are in a release state, the current of the positive electrode of the battery of the electric automobile flows into the chassis of the electric automobile through a relay J1, a diode (D20), a field effect tube (Q20), a first resistor (R20) and a relay J2, if the chassis of the electric automobile and the negative electrode of the battery of the electric automobile leak electricity, a current loop is generated, the current is limited by the field effect tube (Q20) and does not exceed the national standard of 10 milliamperes, the current value is converted into a voltage value by the first resistor (R20), the voltage value is read by a single chip microcomputer N79E8132A, and the current value is fused with a CAN bus system through a CAN communication module (4) to send the leakage current value between the negative electrode of the battery of the electric automobile and the chassis of the automobile to; when two relays J1 and J2 of the positive and negative electrode insulation measurement switching circuit (1) are in a pull-in state, the current value of a drain electrode between the positive electrode of the battery of the electric automobile and the chassis of the automobile can be sent to an instrument console.
CN201510965868.XA 2015-12-22 2015-12-22 Battery insulation measuring circuit of electric automobile Active CN105510839B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510965868.XA CN105510839B (en) 2015-12-22 2015-12-22 Battery insulation measuring circuit of electric automobile

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201510965868.XA CN105510839B (en) 2015-12-22 2015-12-22 Battery insulation measuring circuit of electric automobile

Publications (2)

Publication Number Publication Date
CN105510839A CN105510839A (en) 2016-04-20
CN105510839B true CN105510839B (en) 2020-05-05

Family

ID=55718951

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201510965868.XA Active CN105510839B (en) 2015-12-22 2015-12-22 Battery insulation measuring circuit of electric automobile

Country Status (1)

Country Link
CN (1) CN105510839B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106383314A (en) * 2016-08-26 2017-02-08 科力远混合动力技术有限公司 Automobile power battery pack insulation detection circuit and detection judgment method
CN106771542B (en) * 2016-12-29 2019-08-13 深圳市科陆电子科技股份有限公司 A kind of battery voltage acquisition calibration circuit
CN109633462B (en) * 2018-12-29 2021-04-20 蜂巢能源科技有限公司 Battery voltage state detection method and detection system in battery management system and battery management system

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007012317A (en) * 2005-06-28 2007-01-18 Panasonic Ev Energy Co Ltd Interlock device of battery pack, and battery pack
CN102298092A (en) * 2011-05-29 2011-12-28 启明信息技术股份有限公司 Method and device for detecting power battery insulation resistance of electric automobile
CN202362420U (en) * 2011-11-08 2012-08-01 无锡艾立德智能科技有限公司 Circuit for testing insulating properties between lithium battery and battery casing in electric automobile
CN103033729A (en) * 2012-11-26 2013-04-10 浙江高泰昊能科技有限公司 Insulation detection circuit and detection method used for battery box
CN103454498A (en) * 2013-08-08 2013-12-18 许继集团有限公司 Insulation detection method of electric vehicle power battery pack
CN105158632A (en) * 2015-09-11 2015-12-16 中航锂电(洛阳)有限公司 Power cell insulation and leakage detection system
CN205787035U (en) * 2015-12-22 2016-12-07 盐城工学院 A kind of batteries of electric automobile insulated measurement circuits

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4293942B2 (en) * 2004-05-28 2009-07-08 三洋電機株式会社 Electric vehicle leakage detection circuit and electric vehicle leakage detection method
CN102156252B (en) * 2011-03-21 2013-10-16 奇瑞汽车股份有限公司 Insulation detecting device for electric automobile
US9194918B2 (en) * 2013-12-12 2015-11-24 Ford Global Technologies, Llc Leakage detection circuit with integral circuit robustness check

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007012317A (en) * 2005-06-28 2007-01-18 Panasonic Ev Energy Co Ltd Interlock device of battery pack, and battery pack
CN102298092A (en) * 2011-05-29 2011-12-28 启明信息技术股份有限公司 Method and device for detecting power battery insulation resistance of electric automobile
CN202362420U (en) * 2011-11-08 2012-08-01 无锡艾立德智能科技有限公司 Circuit for testing insulating properties between lithium battery and battery casing in electric automobile
CN103033729A (en) * 2012-11-26 2013-04-10 浙江高泰昊能科技有限公司 Insulation detection circuit and detection method used for battery box
CN103454498A (en) * 2013-08-08 2013-12-18 许继集团有限公司 Insulation detection method of electric vehicle power battery pack
CN105158632A (en) * 2015-09-11 2015-12-16 中航锂电(洛阳)有限公司 Power cell insulation and leakage detection system
CN205787035U (en) * 2015-12-22 2016-12-07 盐城工学院 A kind of batteries of electric automobile insulated measurement circuits

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
电动汽车绝缘电阻有源检测系统;周晨等;《电子测量与仪器学报》;20130531;第27卷(第5期);第409-414页 *

Also Published As

Publication number Publication date
CN105510839A (en) 2016-04-20

Similar Documents

Publication Publication Date Title
CN105510839B (en) Battery insulation measuring circuit of electric automobile
CN202330559U (en) Automobile insulating resistor detecting circuit
CN201886083U (en) Measuring device for isolation resistance of vehicle DC (direct current) high-voltage system
CN202614852U (en) Power cell insulation detecting system
CN102540101A (en) Integrated device for detecting high-pressure value and insulating resistance value of battery pack
CN103278776B (en) A kind of batteries of electric automobile Insulation Inspection System
CN103576043A (en) Electric leakage detecting appratus
CN205632165U (en) Power battery increases journey system
CN103399571A (en) Detecting device and method applied to high-voltage circuit of electromobile motor controller
CN104385932B (en) integrated auxiliary power supply, electric auxiliary system and new energy passenger car
CN203732620U (en) Static current detection device of vehicle-mounted equipment
CN204452063U (en) Elec. vehicle fuse state testing circuit
KR101610921B1 (en) Apparatus for measuring isolation resistance using selective switching and method thereof
CN104142475A (en) Device and method for evaluating insulation detecting module
CN205787035U (en) A kind of batteries of electric automobile insulated measurement circuits
CN206734070U (en) A kind of electric car integrated high voltage distribution box
CN105158632A (en) Power cell insulation and leakage detection system
RU133931U1 (en) DIAGNOSTIC DEVICE FOR DC AND AC POWER Locomotives
CN203422422U (en) Electric vehicle battery box insulation monitoring alarm system
CN104502712A (en) Insulation detection control device and control method for electric automobile power system
CN105068531A (en) Test system of auxiliary brake controller and test method of test system
KR101619477B1 (en) Apparatus and method for measuring isolation resistance using oscillator
CN208698706U (en) A kind of power supply circuit for electronic equipment and electronic equipment
KR101584253B1 (en) Apparatus and method for measuring isolation resistance using battery cell
CN108657088B (en) High-voltage distribution box for electric automobile, electric control system and electric automobile

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant