CN109031061A - A kind of electric automobile power battery group insulation detecting circuit - Google Patents
A kind of electric automobile power battery group insulation detecting circuit Download PDFInfo
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- CN109031061A CN109031061A CN201810752320.0A CN201810752320A CN109031061A CN 109031061 A CN109031061 A CN 109031061A CN 201810752320 A CN201810752320 A CN 201810752320A CN 109031061 A CN109031061 A CN 109031061A
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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
-
- 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
- G01R31/005—Testing of electric installations on transport means
- G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
Abstract
The present invention relates to a kind of electric automobile power battery group insulation detecting circuits, including the first power-switching circuit, Main Control Unit, isolated power supply conversion circuit, difference scaling circuit, bleeder circuit and non-equilibrium bridge voltage acquire switching circuit, the input terminal of first power-switching circuit is connect with power input interface, its output end respectively with Main Control Unit, the input terminal of isolated power supply conversion circuit connects, the output end of the difference scaling circuit and the input terminal of Main Control Unit connect, the input terminal of the bleeder circuit is connect with the output end of non-equilibrium bridge voltage acquisition switching circuit, its output end is connect with the input terminal of difference scaling circuit, the input terminal of the non-equilibrium bridge voltage acquisition switching circuit is connect with power battery pack high pressure access port.The present invention can be realized accurate, stable Insulation monitoring to power battery safety management, promotes electric car BMS performance etc. and suffers from significance.
Description
Technical field
The present invention relates to electric automobile power battery group insulation technology fields, and in particular to a kind of electric automobile power battery
Group insulation detecting circuit.
Background technique
The lack of energy to increasingly sharpen makes new energy technology increasingly be taken seriously, and has gradually in terms of automotive field
The inexorable trend of motorized, the power battery management system (battery as one of crucial three electric systems of electric car
Management system, BMS) quickly developed.It is dynamic due to being provided by power battery management system for electric car
Power, battery management system play irreplaceable effect in terms of guaranteeing the safe and reliable operation of vehicle.The Insulation monitoring of battery pack
Function is one of main task of BMS.The precision and timeliness of Insulation monitoring directly affect the reliability of battery pack, and then influence
Electric automobile whole performance and safety.
Summary of the invention
The purpose of the present invention is to provide a kind of electric automobile power battery group insulation detecting circuits, realize to power battery
The judgement of group insulation performance carries out the insulation real-time detection of power battery pack, and then improves the vehicle security of electric car.
To achieve the above object, the invention adopts the following technical scheme:
A kind of electric automobile power battery group insulation detecting circuit, including the first power-switching circuit, Main Control Unit, isolation
Power-switching circuit, difference scaling circuit, bleeder circuit and non-equilibrium bridge voltage acquire switching circuit, first power supply
The input terminal of conversion circuit is connect with power input interface, and output end is electric with Main Control Unit, isolated power supply conversion respectively
The input terminal on road connects, and the output end of the difference scaling circuit and the input terminal of Main Control Unit connect, and described point
The input terminal of volt circuit is connect with the output end of non-equilibrium bridge voltage acquisition switching circuit, output end and difference ratio enlargement electricity
The input terminal on road connects, and the input terminal and power battery pack high pressure access port of the non-equilibrium bridge voltage acquisition switching circuit connect
It connects.
As a further improvement of the above technical scheme:
The non-equilibrium bridge voltage acquisition switching circuit includes light coupling relay U200, U201, the light coupling relay U200 packet
Include first input end, the second input terminal, third input terminal, the 4th input terminal, the first output end, second output terminal, third output
End and the 4th output end, light coupling relay U201 include the 5th input terminal, the 6th input terminal, the 7th input terminal, the 8th input terminal,
5th output end, the 6th output end, the 7th output end and the 8th output end；The first input end passes through resistance R206 and power supply
Connection, the IO control mouth connection corresponding with Main Control Unit KEY_P+ of the second input terminal, third input terminal pass through resistance R209
It connects to power supply, corresponding with the Main Control Unit KEY_P- IO control mouth connection of the 4th input terminal, first output end, the
Three output ends are connect with bleeder circuit, and second output terminal is connect with the end battery anode high pressure PACK+, the 4th output end and battery
The connection of the group end cathode high pressure PACK-；5th input terminal is connected to power supply by resistance R207, the 6th input terminal and main control
Device unit KEY_C+ corresponding IO control mouth connection, the 7th input terminal are connected to power supply by resistance R210, the 8th input terminal and
Main Control Unit KEY_C- corresponding IO control mouth connection, the 5th output end by resistance R241, R205 it is in parallel after with battery
The positive extra-high voltage bleeder circuit connection of group, the 6th output end and the 7th output end ground connection, the 8th output end pass through resistance R207, R210
It is connect after parallel connection with battery electrode high pressure bleeder circuit.
Described photoelectrical coupler U200, U201 are all made of the chip of model AQW216.
The difference scaling circuit includes operational amplifier U205A, operational amplifier U205B, operational amplifier
U204A, operational amplifier U204B and binary channels variable-gain amplifier U206, the non-inverting input terminal of the operational amplifier U205B
It being connect with positive pole, output end is connect by resistance R225 with the non-inverting input terminal of binary channels variable-gain amplifier U206,
The non-inverting input terminal of the operational amplifier U205A is connect with power cathode, and output end is become by resistance R236 and binary channels
The inverting input terminal of gain amplifier U206 connects, the non-inverting input terminal of the operational amplifier U204B by resistance R226 with
The signal output end of binary channels variable-gain amplifier U206 connects, and the non-inverting input terminal of the operational amplifier U204A passes through electricity
Resistance R239 connect with the signal output end of binary channels variable-gain amplifier U206, the output end of the operational amplifier U204B and
The collection terminal ADC_V+ connection of Main Control Unit, the output end of the operational amplifier U204A and adopting for Main Control Unit
Collect end ADC_V- connection.
Described operational amplifier U204A, U204B, U205A and U205B are all made of the chip of model LM358M, described double
Channel variable-gain amplifier U206 uses the chip of model INA2128.
As shown from the above technical solution, electric automobile power battery group insulation detecting circuit of the present invention, using point
Platen press and difference scaling circuit method carry out high-voltage acquisition, then realize the switching to acquisition channel by non-equilibrium bridge circuit,
The voltage of each acquisition channel is zoomed in and out in the way of electric resistance partial pressure, to adapt to operational amplifier input range, is passed through
Difference scaling circuit Linear Amplifer and sample to total voltage, then through the multiple channels of non-equilibrium bridge circuit acquire data into
Row battery pack insulation status determines.The present invention can be realized accurate, stable Insulation monitoring, to power battery safety management, mentions
It rises electric car BMS performance etc. and suffers from significance.
Detailed description of the invention
Fig. 1 is circuit block diagram of the invention；
Fig. 2 is non-equilibrium bridge voltage acquisition switching circuit figure of the invention；
Fig. 3 is difference ratio amplification circuit diagram of the invention.
Specific embodiment
The present invention will be further described with reference to the accompanying drawing:
As shown in Figure 1, the electric automobile power battery group insulation detecting circuit of the present embodiment, including the first power-switching circuit 2,
Main Control Unit 3, isolated power supply conversion circuit 4, difference scaling circuit 5, bleeder circuit 7 and the acquisition of non-equilibrium bridge voltage
The input terminal of switching circuit 6, the first power-switching circuit 2 is connect with power input interface 1, the first power-switching circuit 2 it is defeated
Outlet is connect with the input terminal of Main Control Unit 3, isolated power supply conversion circuit 4 respectively, the output of difference scaling circuit 5
End is connect with the input terminal of Main Control Unit 3, and the input terminal of bleeder circuit 7 and non-equilibrium bridge voltage acquire switching circuit 6
Output end connection, the output end of bleeder circuit 7 are connect with the input terminal of difference scaling circuit 5, non-equilibrium bridge voltage acquisition
The input terminal of switching circuit 6 is connect with power battery pack high pressure access port.
The master unit 3 of the present embodiment uses single-chip microcontroller, which uses the DZ60 conduct of Freescale company
MCU, has the control function to external circuit, data analysis, processing, store function, and communication function has 12 ADC, meets
Operation, acquisition demand.Master unit 3 enables non-equilibrium bridge voltage by pin and acquires the work of switching circuit 7, is controlled by IO
The conduction and cut-off in optical relay channel switches the input signal of non-equilibrium bridge voltage Acquisition Circuit multichannel high pressure.And connect differential ratio
The low-voltage analog signal is switched to digital signal, led to by the low-voltage analog signal that example amplifying circuit 5 is converted to AD conversion interface
Internal arithmetic formula is crossed, power battery pack positive and negative electrode resistance value over the ground is calculated, judges battery pack state of insulation.
Wherein bleeder circuit 6 include wafer resistance R241, R205, R200, R201, R202, R242, R212, R213,
R214, R215, patch film resistor R208, R211, chip ceramic capacitor C200, C201.Using wafer resistance to non-in circuit
The high pressure that balanced bridge circuit introduces zooms in and out, and is adjusted to AD mouthfuls of normal acquisition voltage ranges, by acquiring resistance R208, R201
Voltage value after scaling is sampled；Non-equilibrium bridge voltage acquisition switching circuit 7 includes light coupling relay U200, U201, patch
Piece film resistor R206, R209, R207, R210；Light coupling relay U200, U201 is all made of the chip of model AQW216, packet
Include pin 1, pin 2, pin 3, pin 4, pin 5, pin 6, pin 7 and pin 8, U201 pin 8 by parallel resistance R241,
The access of resistance R205 switches from the different channel collection voltages for realizing PACK+ voltage are disconnected；U201 pin 5 passes through parallel resistance
The access of R242, resistance R212 switch from the different channel collection voltages for realizing PACK- voltage are disconnected；U201 pin 7, U201 pipe
With linking together access, light coupling relay U200 pin 7 accesses PACK+ high pressure to foot 6, by controlling light coupling relay for PACK
+ high pressure introduces rear end bleeder circuit 6 through U200 pin 8；Light coupling relay U200 pin 5 accesses PACK- high pressure, by controlling light
PACK- high pressure is introduced rear end bleeder circuit 6 through U200 pin 6 by coupling relay；It is adopted in non-equilibrium bridge voltage acquisition switching circuit 7
With light coupling relay control acquisition channel switching, light coupling relay is controlled by 3 single-chip microcontroller pin signal of Main Control Unit and is led
The switch that on-off is opened, thus cooperate Main Control Unit 3 sample pin efficiently, real-time perfoming multichannel switch sampling.The electricity
Light coupling relay U200, U201 used in road, since light coupling relay is without mechanical contact characteristic, there is no contact contacts
Abrasion, possesses longer service life, ensure that the safe and stable operation of system.
As shown in Fig. 2, non-equilibrium bridge voltage acquisition switching circuit 6 includes light coupling relay U200, U201, light coupling relay
U200 includes first input end, the second input terminal, third input terminal, the 4th input terminal, the first output end, second output terminal,
Three output ends and the 4th output end, light coupling relay U201 include the 5th input terminal, the 6th input terminal, the 7th input terminal, the 8th
Input terminal, the 5th output end, the 6th output end, the 7th output end and the 8th output end；First input end by resistance R206 with
Power supply connection, the IO control mouth connection corresponding with Main Control Unit 3KEY_P+ of the second input terminal, third input terminal pass through resistance
R209 is connected to power supply, the IO control mouth connection corresponding with Main Control Unit 3KEY_P- of the 4th input terminal, the first output end,
Third output end is connect with bleeder circuit 7, and second output terminal is connect with the end battery anode high pressure PACK+, the 4th output end with
The connection of the battery electrode end high pressure PACK-；5th input terminal is connected to power supply by resistance R207, the 6th input terminal and main control
Device unit 3KEY_C+ corresponding IO control mouth connection, the 7th input terminal are connected to power supply by resistance R210, the 8th input terminal and
Main Control Unit 3KEY_C- corresponding IO control mouth connection, the 5th output end by resistance R241, R205 it is in parallel after with battery
The positive extra-high voltage bleeder circuit 7 of group connects, the 6th output end and the 7th output end ground connection, the 8th output end by resistance R207,
It is connect after R210 is in parallel with battery electrode high pressure bleeder circuit 7.
The present embodiment, photoelectrical coupler U200, U201 are all made of the chip of model AQW216.
As shown in figure 3, difference scaling circuit 5 is put including operational amplifier U205A, operational amplifier U205B, operation
Big device U204A, operational amplifier U204B and binary channels variable-gain amplifier U206, the non-inverting input terminal of operational amplifier U205B
It being connect with positive pole, output end is connect by resistance R225 with the non-inverting input terminal of binary channels variable-gain amplifier U206,
The non-inverting input terminal of operational amplifier U205A is connect with power cathode, and output end passes through resistance R236 and binary channels variable-gain
The inverting input terminal of amplifier U206 connects, and the non-inverting input terminal of operational amplifier U204B is become by resistance R226 and binary channels
The signal output end of gain amplifier U206 connects, and the non-inverting input terminal of operational amplifier U204A passes through resistance R239 and bilateral
The signal output end of road variable-gain amplifier U206 connects, the output end of operational amplifier U204B and adopting for Main Control Unit
Collect end ADC_V+ connection, the collection terminal ADC_V- connection of the output end and Main Control Unit of operational amplifier U204A.This implementation
Example, operational amplifier U204A, U204B, U205A and U205B are all made of the chip of model LM358M, binary channels variable-gain
Amplifier U206 uses the chip of model INA2128.The channel instrument amplifier U206 A benchmark input pin connects GND, instrument
The channel amplifier U206 B benchmark input pin connects GND.The channel instrument amplifier U206 A output pin is connect with feedback foot, and instrument is put
The big channel device U206 B output pin is connect with feedback foot；Active filter circuit is made of operational amplifier U204 and resistance capacitance.
The connector that power input interface 1 uses has foolproof function, prevents faulty operation for plugs and sockets connection type
Equipment is caused to damage, the linear voltage regulator that power-switching circuit 2 may be implemented access voltage wide range, export fixed voltage value,
Main Control Unit 3, isolated power supply conversion circuit 4 is given to power later by conversion, pressure stabilizing the voltage source of introducing.Isolated power supply
Conversion circuit 4 is inputted using the constant voltage of integrated form, and the DC/DC power module of output is isolated, and is mentioned for difference scaling circuit 5
For isolated power supply all the way.The DC/DC power module is super to have the function of output short circuit protection (self- recoverage), and peripheral circuit is simple.It is full
Sufficient electric car use environment.Power battery pack high pressure access port 8 ensure that high pressure using the connector of big spacing high voltage value
Secured electrical gap and safety creepage distance.
Working principle: outside access power supply provides operating voltage by power input interface 1 for entire circuit, after access
External power supply is converted into master unit 3 and 5 normal working voltage of difference scaling circuit through power-switching circuit 2.Isolation
Operating voltage is converted into difference scaling circuit 5 and worked required isolated working voltage by power-switching circuit 4.
External impetus battery pack PACK voltage is introduced by power battery pack high pressure access port 8, is accessed after high pressure through non-flat
The bridge voltage acquisition switching circuit 6 that weighs carries out the switching of multichannel high-voltage acquisition.The I/O port pin of Main Control Unit 3 is in circuit
Light coupling relay is controlled, and the conducting by controlling light coupling relay realizes collection voltages switching with by switch.Partial pressure electricity
Total voltage is divided by multiple wafer resistance in road 5,0-500V high voltage is divided as low voltage signal to meet control
ADC thief hatch input range in device unit 3.The low voltage signal is automatically converted into differential signal, differential signal by linear optical coupling
The sampling that adapts to single-chip microcontroller in main control unit is amplified using difference scaling circuit to the voltage signal of 0V-5V
Range.The input port AD of single-chip microcontroller in master unit samples multiple voltage signals after the switching of channel, passes through single-chip microcontroller journey
Sequence operation calculates power battery pack positive and negative anodes resistance value over the ground, to realize power battery pack Insulation monitoring function.
Embodiment described above only describe the preferred embodiments of the invention, not to model of the invention
It encloses and is defined, without departing from the spirit of the design of the present invention, those of ordinary skill in the art are to technical side of the invention
The various changes and improvements that case is made should all be fallen into the protection scope that claims of the present invention determines.
Claims (5)
1. a kind of electric automobile power battery group insulation detecting circuit, it is characterised in that: including the first power-switching circuit, master control
Device unit, isolated power supply conversion circuit, difference scaling circuit, bleeder circuit and non-equilibrium bridge voltage acquisition switching electricity processed
The input terminal on road, first power-switching circuit is connect with power input interface, output end respectively with Main Control Unit,
The input terminal of isolated power supply conversion circuit connects, the input of the output end and Main Control Unit of the difference scaling circuit
The output end of end connection, the input terminal of the bleeder circuit and non-equilibrium bridge voltage acquisition switching circuit is connect, output end and
The input terminal of difference scaling circuit connects, the input terminal and power battery pack of the non-equilibrium bridge voltage acquisition switching circuit
The connection of high pressure access port.
2. electric automobile power battery group insulation detecting circuit according to claim 1, it is characterised in that: described non-equilibrium
It includes light coupling relay U200, U201 that bridge voltage, which acquires switching circuit, and the light coupling relay U200 includes first input end, the
Two input terminals, third input terminal, the 4th input terminal, the first output end, second output terminal, third output end and the 4th output end,
Light coupling relay U201 includes the 5th input terminal, the 6th input terminal, the 7th input terminal, the 8th input terminal, the 5th output end, the 6th
Output end, the 7th output end and the 8th output end；The first input end is connected to power supply by resistance R206, the second input terminal
IO control mouth connection corresponding with Main Control Unit KEY_P+, third input terminal are connected to power supply by resistance R209, and the 4th
Input terminal IO control mouth connection corresponding with Main Control Unit KEY_P-, first output end, third output end and partial pressure
Circuit connection, second output terminal are connect with the end battery anode high pressure PACK+, the 4th output end and battery electrode high pressure
The connection of the end PACK-；5th input terminal is connected to power supply by resistance R207, the 6th input terminal and Main Control Unit KEY_
The corresponding IO control mouth connection of C+, the 7th input terminal are connected to power supply by resistance R210, the 8th input terminal and master controller list
The corresponding IO control mouth connection of first KEY_C-, the 5th output end by resistance R241, R205 it is in parallel after with battery anode high pressure
Bleeder circuit connection, the 6th output end and the 7th output end ground connection, the 8th output end by resistance R207, R210 it is in parallel after with electricity
The connection of pond group cathode high pressure bleeder circuit.
3. electric automobile power battery group insulation detecting circuit according to claim 2, it is characterised in that: the photoelectricity coupling
Clutch U200, U201 is all made of the chip of model AQW216.
4. electric automobile power battery group insulation detecting circuit according to claim 1, it is characterised in that: the differential ratio
Example amplifying circuit includes operational amplifier U205A, operational amplifier U205B, operational amplifier U204A, operational amplifier U204B
And binary channels variable-gain amplifier U206, the non-inverting input terminal of the operational amplifier U205B are connect with positive pole, output
End is connect by resistance R225 with the non-inverting input terminal of binary channels variable-gain amplifier U206, the operational amplifier U205A's
Non-inverting input terminal is connect with power cathode, and output end is defeated by resistance R236 and the reverse phase of binary channels variable-gain amplifier U206
Enter end connection, the non-inverting input terminal of the operational amplifier U204B passes through resistance R226 and binary channels variable-gain amplifier U206
Signal output end connection, the non-inverting input terminal of the operational amplifier U204A put by resistance R239 and binary channels variable-gain
The signal output end connection of big device U206, the output end of the operational amplifier U204B and the collection terminal of Main Control Unit
ADC_V+ connection, the collection terminal ADC_V- connection of the output end and Main Control Unit of the operational amplifier U204A.
5. electric automobile power battery group insulation detecting circuit according to claim 1, it is characterised in that: the operation is put
Big device U204A, U204B, U205A and U205B are all made of the chip of model LM358M, the binary channels variable-gain amplifier
U206 uses the chip of model INA2128.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810752320.0A CN109031061A (en) | 2018-07-10 | 2018-07-10 | A kind of electric automobile power battery group insulation detecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810752320.0A CN109031061A (en) | 2018-07-10 | 2018-07-10 | A kind of electric automobile power battery group insulation detecting circuit |
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| Publication Number | Publication Date |
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| CN109031061A true CN109031061A (en) | 2018-12-18 |
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Family Applications (1)
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| CN201810752320.0A Pending CN109031061A (en) | 2018-07-10 | 2018-07-10 | A kind of electric automobile power battery group insulation detecting circuit |
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Cited By (5)
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| CN109828219A (en) * | 2019-03-21 | 2019-05-31 | 奇瑞新能源汽车技术有限公司 | A kind of electric automobile power battery insulation detecting circuit |
| CN110187203A (en) * | 2019-05-10 | 2019-08-30 | 江苏敏安电动汽车有限公司 | A kind of test macro based on cell management system of electric automobile |
| CN111566490A (en) * | 2019-07-23 | 2020-08-21 | 深圳欣锐科技股份有限公司 | Insulation detection circuit, mainboard and relevant device |
| CN112198368A (en) * | 2020-09-22 | 2021-01-08 | 合肥国轩高科动力能源有限公司 | Electric automobile insulation resistance detection circuit and method |
| WO2022088473A1 (en) * | 2020-10-28 | 2022-05-05 | 一巨自动化装备（上海）有限公司 | Insulation detection circuit achieving voltage equalization |
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