CN105510839A - Electric vehicle battery insulation measurement circuit - Google Patents
Electric vehicle battery insulation measurement circuit Download PDFInfo
- Publication number
- CN105510839A CN105510839A CN201510965868.XA CN201510965868A CN105510839A CN 105510839 A CN105510839 A CN 105510839A CN 201510965868 A CN201510965868 A CN 201510965868A CN 105510839 A CN105510839 A CN 105510839A
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- Prior art keywords
- circuit
- resistance
- measurement
- chip microcomputer
- electric automobile
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Classifications
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- 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
- G01R31/12—Testing 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
- G01R31/1227—Testing 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
-
- 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
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
Abstract
The invention discloses an electric vehicle battery insulation measurement circuit comprising a positive and 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 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). By making use of the high voltage and constant current source circuit of an electric vehicle battery, the leakage current value of the electric vehicle battery can be measured more accurately, and the design of an electric vehicle battery insulation leakage current measurement circuit is simplified. The electric vehicle battery insulation measurement circuit is of low cost, and has a wide range of applications.
Description
Technical field
The present invention relates to the insulation leakagel volume leakage current measurement circuit between inner direct current middle high-pressure system and shell such as electric automobile, hybrid electric vehicle, railway electric locomotive, power electronic equipment.
Background technology
Usually there is middle high-pressure electric power system in the systems such as electric automobile, hybrid electric vehicle, railway electric locomotive, power electronic equipment, the high power components that middle high-pressure electric power system is vehicle provides electric energy.And middle high-pressure electric power system is primarily of electrical equipment compositions such as electrokinetic cell, supply convertor, motors.The voltage of electrokinetic cell usually at more than 48V, have even up to more than 450V.Higher operating voltage is had higher requirement to the insulating property between vehicle chassis and middle high-pressure electric power system.The factors such as the humidity of air, the aging of insulating medium all can cause the decreasing insulating between middle high-pressure electric power system and vehicle chassis.The decline of insulating property makes power supply positive and negative electrode go between by forming leakage current loop between insulation course and chassis, this not only can affect the normal work of vehicle electrical systems, and the safety of entail dangers to passenger, serious may cause the consequences such as vehicle electric fire.Therefore in real time, detect the insulation leakagel volume leakage electric current of the electric system of middle high-pressure and vehicle chassis quantitatively, find insulation fault, guarantee vehicle electrical systems is normally worked, vehicle safety and ensure that passenger safety is significant.
Summary of the invention
Technical matters to be solved by this invention is: overcome the shortcomings such as by megohmmeter, prior art measures that the insulation leakagel volume leakage current precision of direct-current high-voltage system is not high, potential safety hazard is deposited in manual operation and other invention circuit is complicated.There is provided a kind of and produce 0 milliampere to 10 milliamperes leakage current by constant-current source circuit, by single chip computer measurement and control, realize the insulation leakagel volume leakage electric current detecting the electric system of middle high-pressure and vehicle chassis quantitatively, find insulation fault in real time.And the measurement mechanism that can merge mutually with CAN system.
The present invention adopts following technical scheme for solving the problems of the technologies described above:
A kind of batteries of electric automobile insulated measurement circuits of the present invention, comprising: positive and negative electrode insulation measurement commutation circuit (1), constant-current source circuit (2), single-chip microcomputer voltage measurement and control circuit (3), CAN communication module (4).Wherein, described positive and negative electrode insulation measurement commutation circuit (1) is connected with constant-current source circuit (2), described constant-current source circuit (2) is connected with single-chip microcomputer voltage measurement and control circuit (3), described single-chip microcomputer voltage measurement and control circuit (3) are connected with CAN communication module (4), and described positive and negative electrode insulation measurement commutation circuit (1) is controlled by single-chip microcomputer voltage measurement and control circuit (3).
The present invention is by positive and negative electrode insulation measurement commutation circuit (1) periodically change detection: the drain conditions between batteries of electric automobile negative or positive electrode and vehicle chassis; Batteries of electric automobile self high pressure is utilized to produce the batteries of electric automobile leakage current of 0 milliampere to 10 milliamperes by constant-current source circuit (2), become voltage signal by the first resistance (R20) in constant-current source circuit (2), accurately measure batteries of electric automobile leakage current value by single-chip microcomputer voltage measurement and control circuit (3); Merged mutually with CAN system by CAN communication module (4), the leakage current value between batteries of electric automobile and vehicle chassis is sent to instrument console, thus simplify the design of batteries of electric automobile insulated measurement circuits.
Preferably, described single-chip microcomputer voltage measurement and control circuit (3) adopt N79E8132A microprocessor detect to control.
Preferably, the transceiver of described CAN communication module (4) adopts TJA1050 chip.
The present invention adopts above technical scheme to have following beneficial effect:
Overcome and manually utilize the shortcoming that the precision of megohmmeter measurement direct-current high-voltage system insulation leakagel volume leakage electric current is not high, deposit potential safety hazard; Simplify the design of batteries of electric automobile insulated measurement circuits; The measurement of self-adaptation various direct-current high-voltage system insulation leakagel volume leakage electric current.
Accompanying drawing explanation
Fig. 1 is circuit structure diagram of the present invention.
Fig. 2 is the circuit theory diagrams of positive and negative electrode insulation measurement commutation circuit (1) of the present invention.
Fig. 3 is the circuit theory diagrams of constant-current source circuit of the present invention (2).
Fig. 4 is the circuit theory diagrams of single-chip microcomputer voltage measurement of the present invention and control circuit (3).
Embodiment
A kind of batteries of electric automobile insulated measurement circuits of the present invention, comprises shown in Fig. 1: positive and negative electrode insulation measurement commutation circuit (1), constant-current source circuit (2), single-chip microcomputer voltage measurement and control circuit (3), CAN communication module (4).Wherein, described positive and negative electrode insulation measurement commutation circuit (1) is connected with constant-current source circuit (2), described constant-current source circuit (2) is connected with single-chip microcomputer voltage measurement and control circuit (3), described single-chip microcomputer voltage measurement and control circuit (3) are connected with CAN communication module (4), and described positive and negative electrode insulation measurement commutation circuit (1) is controlled by single-chip microcomputer voltage measurement and control circuit (3).
Positive and negative electrode insulation measurement commutation circuit (1) described in Fig. 2 is made up of two relays (J1, J2).The normally closed contact of described relay (J1) is connected with the positive pole of batteries of electric automobile; The normally opened contact of described relay (J1) is connected with the normally closed contact of described relay (J2) and electric automobile vehicle chassis; The normally opened contact of described relay (J2) is connected with the negative pole of batteries of electric automobile; The moving contact of described relay (J1) is connected with the diode D20 anode in constant-current source circuit (2); The moving contact of described relay (J2) is connected with the negative pole of batteries of electric automobile insulated measurement circuits; Coil one end of described two relays (J1, J2) is connected with power supply+15V, the other end is connected with the collector of single-chip microcomputer voltage measurement and control circuit (3) interior BG20 and BG21 respectively, and the contact change-over of two relays (J1, J2) is controlled by single-chip microcomputer voltage measurement and control circuit (3).
Constant-current source circuit described in Fig. 3 (2) is made up of diode D20, field effect transistor Q20, operational amplifier IC20, first to fourth resistance (R20, R21, R22, R23).Described diode D20 anode is connected with the moving contact of the relay (J1) of positive and negative electrode insulation measurement commutation circuit (1), and negative electrode is connected with the drain electrode of field effect transistor Q20; The source electrode of described field effect transistor Q20 is connected with the first resistance (R20), operational amplifier IC20 negative input end and single-chip microcomputer voltage measurement and control circuit (3), drain electrode is connected with diode D20 negative electrode, and grid is connected with the output terminal of the 4th resistance (R23) and operational amplifier IC20; Described operational amplifier IC20 positive input terminal is connected with the second resistance (R21) one end and the 3rd resistance (R22) one end, the source electrode of operational amplifier IC20 negative input end and the first resistance (R20) one end, field effect transistor Q20 and single-chip microcomputer voltage measurement and control circuit (3) are connected, and grid and the 4th resistance (R23) one end of operational amplifier IC20 output terminal and field effect transistor Q20 are connected; The source electrode of described first resistance (R20) one end and field effect transistor Q20, operational amplifier IC20 negative input end and single-chip microcomputer voltage measurement and control circuit (3) are connected, and the other end is connected with the negative pole of batteries of electric automobile insulated measurement circuits; Described second resistance (R21) one end is connected with one end of operational amplifier IC20 positive input terminal and the 3rd resistance (R22), and the other end is connected with the negative pole of batteries of electric automobile insulated measurement circuits; 3rd resistance (R22) one end is connected with one end of operational amplifier IC20 positive input terminal and the second resistance (R21), and the other end is connected with 15 volts, the positive pole of batteries of electric automobile insulated measurement circuits; 4th resistance (R23) one end is connected with the drain electrode of operational amplifier IC20 output terminal and field effect transistor Q20, and the other end is connected with 15 volts, the positive pole of batteries of electric automobile insulated measurement circuits.
Single-chip microcomputer voltage measurement described in Fig. 4 and control circuit (3) are made up of single-chip microcomputer N79E8132A, triode BG20, triode BG21, the 5th resistance (R24) and the 6th resistance (R25).Triode BG20, the collector of BG21 respectively with just, negative insulation measures two relay (J1 of commutation circuit (1), J2) coil one end connects, triode BG20, the emitter of BG21 is connected with the negative pole of batteries of electric automobile insulated measurement circuits, triode BG20, the base stage of BG21 is connected with the output of single-chip microcomputer N79E8132A, by single-chip microcomputer N79E8132A by triode BG20, BG21 is just controlling, negative insulation measures two relay (J1 of commutation circuit (1), J2), periodically measure the drain conditions between batteries of electric automobile negative or positive electrode and vehicle chassis.
Shown in composition graphs 2-Fig. 4: when just, negative insulation measures two relay (J1 of commutation circuit (1), when J2) being all in release conditions, the electric current of batteries of electric automobile positive pole is through relay (J1), diode D20, Q20, R20, relay (J2) flows into electric automobile chassis, if electric automobile chassis and the electric leakage of batteries of electric automobile negative pole, then this current return just produces, electric current is by field effect transistor Q20 current limliting, it is made to be no more than GB 10 milliamperes, current value converts magnitude of voltage to by R20, read by single-chip microcomputer N79E8132A, merged mutually with CAN system by CAN communication module (4), leakage current value between batteries of electric automobile negative pole and vehicle chassis is sent to instrument console.When two relays (J1, J2) of positive and negative electrode insulation measurement commutation circuit (1) are all in attracting state, the leakage current value between batteries of electric automobile positive pole and vehicle chassis can be sent to instrument console.Staff can see the drain conditions between batteries of electric automobile and vehicle chassis in real time in pilothouse, Timeliness coverage vehicle electrical systems potential safety hazard, ensures passenger's safety by bus.
Claims (3)
1. a batteries of electric automobile insulated measurement circuits, it is characterized in that: just comprise, negative insulation measures commutation circuit (1), constant-current source circuit (2), single-chip microcomputer voltage measurement and control circuit (3), CAN communication module (4), wherein, just described, negative insulation is measured commutation circuit (1) and is connected with constant-current source circuit (2), described constant-current source circuit (2) is connected with single-chip microcomputer voltage measurement and control circuit (3), described single-chip microcomputer voltage measurement and control circuit (3) are connected with CAN communication module (4), just described, negative insulation is measured commutation circuit (1) and is controlled by single-chip microcomputer voltage measurement and control circuit (3).
2. a kind of batteries of electric automobile insulated measurement circuits according to claim 1, it is characterized in that: described positive and negative electrode insulation measurement commutation circuit (1) is made up of two relays (J1, J2), and the normally closed contact of described relay (J1) is connected with the positive pole of batteries of electric automobile; The normally opened contact of described relay (J1) is connected with the normally closed contact of described relay (J2) and electric automobile vehicle chassis; The normally opened contact of described relay (J2) is connected with the negative pole of batteries of electric automobile; The moving contact of described relay (J1) is connected with diode (D20) anode in constant-current source circuit (2); The moving contact of described relay (J2) is connected with the negative pole of batteries of electric automobile insulated measurement circuits; Coil one end of described two relays (J1, J2) is connected with power supply+15V, the other end is connected with the collector of (BG20) and (BG21) in single-chip microcomputer voltage measurement and control circuit (3) respectively, and the contact change-over of two relays (J1, J2) is controlled by single-chip microcomputer voltage measurement and control circuit (3).
3. a kind of batteries of electric automobile insulated measurement circuits according to claim 1, it is characterized in that: described constant-current source circuit (2) is made up of diode (D20), field effect transistor (Q20), operational amplifier (IC20), first to fourth resistance (R20, R21, R22, R23), described diode (D20) anode is connected with the moving contact of the relay (J1) of positive and negative electrode insulation measurement commutation circuit (1), and negative electrode is connected with the drain electrode of field effect transistor (Q20); The source electrode of described field effect transistor (Q20) is connected with the first resistance (R20), operational amplifier (IC20) negative input end and single-chip microcomputer voltage measurement and control circuit (3), drain electrode is connected with diode (D20) negative electrode, and grid is connected with the output terminal of the 4th resistance (R23) and operational amplifier IC20; Described operational amplifier (IC20) positive input terminal is connected with the second resistance (R21) one end and the 3rd resistance (R22) one end, the source electrode of operational amplifier (IC20) negative input end and the first resistance (R20) one end, field effect transistor Q20 and single-chip microcomputer voltage measurement and control circuit (3) are connected, and grid and the 4th resistance (R23) one end of operational amplifier (IC20) output terminal and field effect transistor (Q20) are connected; The source electrode of described first resistance (R20) one end and field effect transistor (Q20), operational amplifier (IC20) negative input end and single-chip microcomputer voltage measurement and control circuit (3) are connected, and the other end is connected with the negative pole of batteries of electric automobile insulated measurement circuits; Described second resistance (R21) one end is connected with one end of operational amplifier (IC20) positive input terminal and the 3rd resistance (R22), and the other end is connected with the negative pole of batteries of electric automobile insulated measurement circuits; 3rd resistance (R22) one end is connected with one end of operational amplifier (IC20) positive input terminal and the second resistance (R21), and the other end is connected with 15 volts, the positive pole of batteries of electric automobile insulated measurement circuits; 4th resistance (R23) one end is connected with the drain electrode of operational amplifier (IC20) output terminal and field effect transistor (Q20), and the other end is connected with 15 volts, the positive pole of batteries of electric automobile insulated measurement circuits.
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 |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510965868.XA CN105510839B (en) | 2015-12-22 | 2015-12-22 | Battery insulation measuring circuit of electric automobile |
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| CN105510839A true CN105510839A (en) | 2016-04-20 |
| CN105510839B CN105510839B (en) | 2020-05-05 |
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| CN201510965868.XA Active CN105510839B (en) | 2015-12-22 | 2015-12-22 | Battery insulation measuring circuit of electric automobile |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN106771542A (en) * | 2016-12-29 | 2017-05-31 | 深圳市科陆电子科技股份有限公司 | A kind of battery voltage acquisition calibrates circuit |
| CN109633462A (en) * | 2018-12-29 | 2019-04-16 | 蜂巢能源科技有限公司 | Cell voltage condition detection method and detection system and battery management system in battery management system |
| CN111474449A (en) * | 2020-03-31 | 2020-07-31 | 福建时代星云科技有限公司 | Insulation detection method and system of optical storage and charge detection system |
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| 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 |
| CN109633462A (en) * | 2018-12-29 | 2019-04-16 | 蜂巢能源科技有限公司 | Cell voltage condition detection method and detection system and battery management system in battery management system |
| CN111474449A (en) * | 2020-03-31 | 2020-07-31 | 福建时代星云科技有限公司 | Insulation detection method and system of optical storage and charge detection system |
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