CN202133761U - Insulation resistance detector of vehicle power cells - Google Patents
Insulation resistance detector of vehicle power cells Download PDFInfo
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- CN202133761U CN202133761U CN201120174840U CN201120174840U CN202133761U CN 202133761 U CN202133761 U CN 202133761U CN 201120174840 U CN201120174840 U CN 201120174840U CN 201120174840 U CN201120174840 U CN 201120174840U CN 202133761 U CN202133761 U CN 202133761U
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- insulation resistance
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Abstract
The utility model provides an insulation resistance detector of vehicle power cells, comprising an MCU (Micro Control Unit), an anode insulation switch circuit, a cathode insulation switch circuit, an operation amplification circuit, etc. A GPIO (General Purpose Input Output) module of the microcontroller is in external connection with a control terminal of an anode insulation optical coupler relay; a GPIO module of the microcontroller is in external connection with a control terminal of a cathode insulation optical coupler relay and outputs insulation resistance sampling voltage; the insulation resistance sampling voltage is connected with a voltage isolation circuit through the operation amplification circuit; a communication module of the MCU transmits insulation resistance values to a BMS (Battery Management System) in a message form after the level conversion of a CAN (Controller Area Network) transceiver; the MCU is in connection with an LCD (Liquid Crystal Display) of a man-machine interaction unit to display insulation resistance values of power cells. According to the utility model, the problem is solved that traditional insulation resistance detectors can not detect whether it is the anode, the cathode or the bipolar that leaks, the leakage degree of present power cells can be accurately measured.
Description
Technical field
The utility model discloses a kind of insulation resistance detector of vehicle mounted dynamic battery, belongs to the New-energy electric vehicle technical field.
Background technology
The energy of electric automobile is mainly derived from vehicle mounted dynamic battery.Because electrokinetic cell is generally all more than several hectovolts, if the situation of the electric leakage that meets accident, with the direct threats personal safety.Therefore, electric automobile needs a kind of equipment that can detect the electrokinetic cell insulation resistance in real time.Simultaneously, outstanding electrokinetic cell insulation resistance detection method also is to estimate the most important performance index of a electric automobile.Traditional electrokinetic cell insulation resistance detection method can only be judged current electrokinetic cell and whether be in the electric leakage state, and can not judge electrokinetic cell is anodal electric leakage or negative pole electric leakage or bipolar electric leakage simultaneously.Nor can accurately measure the electric leakage degree of electrokinetic cell.Thereby can't more detailed insulation information be provided for the driver, the potential safety hazard that this has increased driving undoubtedly also is unfavorable for the popularization of whole electric automobile industry.
Summary of the invention
The utility model discloses a kind of insulation resistance detector of vehicle mounted dynamic battery, and it can confirm the electric leakage state of current electrokinetic cell through the variation of insulation resistance sampled voltage, has solved traditional insulation resistance and has detected the problem that can't locate the electric leakage position.In real time the insulation resistance between electrokinetic cell positive and negative busbar and the bonding is detected, and can measure positive pole, negative pole and the bipolar insulating resistance value of electrokinetic cell exactly body earth.
The technical solution of the utility model is following:
Electrokinetic cell insulation resistance pick-up unit mainly is made up of microcontroller (MCU-Micro Control Unit), anodal insulated switch circuit, negative pole insulated switch circuit, operational amplification circuit, voltage isolation circuit, controller area network (CAN-Controller Area Network) transceiver and LCD display.Wherein, The general I/O of MCU (GPIO-General Purpose Input Output) module 1, the control end of external anodal insulation light coupling relay, the GPIO module 2 of MCU; The control end of external negative pole insulation light coupling relay; MCU selects turn-on logic according to control strategy, output insulation resistance sampled voltage.The insulation resistance sampled voltage after operational amplification circuit is handled, gets into voltage isolation circuit again, does the isolation processing of voltage.At last, analog to digital conversion (AD-Analog-to-Digital Converter) module that is input to MCU is done voltage sample.MCU can calculate the insulating resistance value of current electrokinetic cell according to sampled voltage according to the insulation resistance detection algorithm.The communication module of MCU after CAN transceiver level conversion, with the form of message, sends insulating resistance value to BMS and uses.Simultaneously, MCU is shown to the driver to the electrokinetic cell insulating resistance value through the LCD screen of man-machine interaction unit.
The concrete structure of the utility model is following:
Anodal insulated switch circuit mainly is made up of anodal bleeder circuit and anodal insulation light coupling relay.When the control end VHP_KEY output low level of positive pole insulation light coupling relay, constitute path between 1 pin of relay and 2 pin, thus conducting between 7 pin of relay and 8 pin, resistance R 0 ~ R7 and R16 constitute anodal bleeder circuit.Anodal insulation resistance sample voltage value of 7 pin output.
Negative pole insulated switch circuit mainly is made up of negative pole bleeder circuit and negative pole insulation light coupling relay.When the control end VHN_KEY output low level of negative pole insulation light coupling relay, constitute path between 3 pin of relay and 4 pin, thus conducting between 5 pin of relay and 6 pin, resistance R 8 ~ R15 and R17 formation negative pole bleeder circuit.Negative pole insulation resistance sample voltage value of 6 pin output.
Operational amplification circuit mainly is made up of operational amplifier and power module 1.Power module 1 input end :+Vin meets 12V, and-Vin meets AGND; It is body earth that output terminal: GND meets DGND ,-12V connect operational amplifier-Vs ,+12V connect operational amplifier+Vs, supply with for operational amplifier provides dual power supply.Operational amplifier+IN connects 7 pin of light coupling relay, and-IN connects 6 pin of light coupling relay, and the insulation resistance sampled voltage is input to operational amplifier through these two pins.The output terminal of operational amplifier: REF meets AGND, and Vout outputs to voltage isolation circuit.1 pin of operational amplifier and 8 pin skies connect, and the resistance between the expression is infinitely great, confirms enlargement factor with this.
Voltage isolation circuit mainly is made up of power module 1, power module 2 and voltage isolation chip jointly.Wherein: power module 1 is multiplexing power module, and it provides power supply to supply with for the input end of operational amplifier and voltage isolation chip simultaneously; Its output terminal: GND meets DGND, and-12V meets Vs1-, and+12V meets Vs1+.Power module 2 is for the output terminal of voltage isolation chip provides power supply, and it is identical that its input end and power module 1 connect method.Output terminal: GND meets DGND, and-12V meets Vs2-, and+12V meets Vs2+.The input end of voltage isolation chip is connected with operational amplifier, and output end vo ut links to each other with the AD1 of MCU and supplies the MCU sampling, and GND links to each other with AGND.The voltage isolation chip can make the high voltage signal of electrokinetic cell output can the low-voltage sampled signal that input to MCU not exerted an influence.
The signal of the CAN communication module of MCU receives pin CAN_RXD and is connected with signal transmission pin TXD with the signal reception pin RXD of CAN transceiver with signal transmission pin CAN_TXD, accomplishes the Transistor-Transistor Logic level transmission of CAN bus; The CANH end of CAN transceiver links to each other with the CANL end with the CAN EBI CANH end of BMS with the CANL end, accomplishes the differential level transmission of CAN bus, has so just realized the conversion of Transistor-Transistor Logic level and differential level.
LCD display is driven by Serial Peripheral Interface (SPI) (the SPI-Serial Peripheral Interface) module of MCU.The chip of MCU is selected CS, serial clock SCK, is mainly gone out from going into MOSI, mainly going into from going out the MISO pin to connect and be connected with LCD display CS, CLK, MISO, MOSI pin respectively; The data presentation of LCD, by MCU through the mode of the tabling look-up realization of decoding.
Electrokinetic cell insulation resistance pick-up unit is according to following control method, the insulation resistance measuring ability:
(1). the anodal insulated switch circuit of gating, gating negative pole insulated switch circuit.If the sampled voltage of record this moment is that the resistance of V1. R0 ~ R7 is 200K, R16 is 1K, then the V1 of this moment be between the positive and negative busbar total voltage 1/100.
(2). the anodal insulated switch circuit of gating, turn-off negative pole insulated switch circuit.Record sampled voltage at this moment is V2.
If the resistance of R8 ~ R15 is 200K, R17 is 1K, then this moment V2 be between negative busbar and the bonding (DGND) voltage 1/100.
(3). turn-off anodal insulated switch circuit, gating negative pole insulated switch circuit.Record sampled voltage at this moment is V3.
This moment V3 be between negative busbar and the bonding (DGND) voltage 1/100.
The truth table of realizing above-mentioned steering logic is as follows:
| GPIO1 | GPIO2 | |
| V1 | Low level | Low level |
| V2 | Low level | High level |
| V3 | High level | High level |
(4). calculate insulation resistance
Calculate insulation resistance by following formula, wherein Rp is anodal insulation resistance to bonding, and Rn is the insulation resistance of negative pole to bonding.
Kp=V2/(V1-V2);
Kn=V3/(V1-V3);
Rp=(1-Kp*Kn)*R/(Kn+Kp*Kn);
Rn=(1-Kp*Kn)*R/(Kp+Kp*Kn);
The good effect of the utility model is:Can do insulation to the positive and negative busbar of electrokinetic cell in real time and detect, judge state of insulation, calculate insulating resistance value.Solve traditional insulation resistance pick-up unit effectively and can not judge anodal electric leakage or negative pole electric leakage or the bipolar problem of electric leakage simultaneously.Simultaneously, can accurately measure the electric leakage degree of current electrokinetic cell.Friendly man-machine interface can give the driver with prompting accurately, has stopped to detect the potential safety hazard that out of true is brought because of insulation resistance.
Description of drawings
Fig. 1 is the utility model structured flowchart;
Fig. 2 is the utility model circuit theory diagrams.
Embodiment
Embodiment 1
As shown in Figure 1: electrokinetic cell insulation resistance pick-up unit mainly is made up of microcontroller (MCU-Micro Control Unit), anodal insulated switch circuit, negative pole insulated switch circuit, operational amplification circuit, voltage isolation circuit, controller area network (CAN-Controller Area Network) transceiver and LCD display.Wherein, The general I/O of MCU (GPIO-General Purpose Input Output) module 1, the control end of external anodal insulation light coupling relay, the GPIO module 2 of MCU; The control end of external negative pole insulation light coupling relay; MCU selects turn-on logic according to control strategy, output insulation resistance sampled voltage.The insulation resistance sampled voltage after operational amplification circuit is handled, gets into voltage isolation circuit again, does the isolation processing of voltage.At last, analog to digital conversion (AD-Analog-to-Digital Converter) module that is input to MCU is done voltage sample.MCU can calculate the insulating resistance value of current electrokinetic cell according to sampled voltage according to the insulation resistance detection algorithm.The communication module of MCU after CAN transceiver level conversion, with the form of message, sends insulating resistance value to BMS and uses.Simultaneously, MCU is shown to the driver to the electrokinetic cell insulating resistance value through the LCD screen of man-machine interaction unit.
Embodiment 2
As shown in Figure 2: anodal insulated switch circuit mainly is made up of anodal bleeder circuit and anodal insulation light coupling relay.When the control end VHP_KEY output low level of positive pole insulation light coupling relay, constitute path between 1 pin of relay and 2 pin, thus conducting between 7 pin of relay and 8 pin, resistance R 0 ~ R7 and R16 constitute anodal bleeder circuit.Anodal insulation resistance sample voltage value of 7 pin output.
Negative pole insulated switch circuit mainly is made up of negative pole bleeder circuit and negative pole insulation light coupling relay.When the control end VHN_KEY output low level of negative pole insulation light coupling relay, constitute path between 3 pin of relay and 4 pin, thus conducting between 5 pin of relay and 6 pin, resistance R 8 ~ R15 and R17 formation negative pole bleeder circuit.Negative pole insulation resistance sample voltage value of 6 pin output.
Operational amplification circuit mainly is made up of operational amplifier and power module 1.Power module 1 input end :+Vin meets 12V, and-Vin meets AGND; It is body earth that output terminal: GND meets DGND ,-12V connect operational amplifier-Vs ,+12V connect operational amplifier+Vs, supply with for operational amplifier provides dual power supply.Operational amplifier+IN connects 7 pin of light coupling relay, and-IN connects 6 pin of light coupling relay, and the insulation resistance sampled voltage is input to operational amplifier through these two pins.The output terminal of operational amplifier: REF meets AGND, and Vout outputs to voltage isolation circuit.1 pin of operational amplifier and 8 pin skies connect, and the resistance between the expression is infinitely great, confirms enlargement factor with this.
Voltage isolation circuit mainly is made up of power module 1, power module 2 and voltage isolation chip jointly.Wherein: power module 1 is multiplexing power module, and it provides power supply to supply with for the input end of operational amplifier and voltage isolation chip simultaneously; Its output terminal: GND meets DGND, and-12V meets Vs1-, and+12V meets Vs1+.Power module 2 is for the output terminal of voltage isolation chip provides power supply, and it is identical that its input end and power module 1 connect method.Output terminal: GND meets DGND, and-12V meets Vs2-, and+12V meets Vs2+.The input end of voltage isolation chip is connected with operational amplifier, and output end vo ut links to each other with the AD1 of MCU and supplies the MCU sampling, and GND links to each other with AGND.The voltage isolation chip can make the high voltage signal of electrokinetic cell output can the low-voltage sampled signal that input to MCU not exerted an influence.
The signal of the CAN communication module of MCU receives pin CAN_RXD and is connected with signal transmission pin TXD with the signal reception pin RXD of CAN transceiver with signal transmission pin CAN_TXD, accomplishes the Transistor-Transistor Logic level transmission of CAN bus; The CANH end of CAN transceiver links to each other with the CANL end with the CAN EBI CANH end of BMS with the CANL end, accomplishes the differential level transmission of CAN bus, has so just realized the conversion of Transistor-Transistor Logic level and differential level.
LCD display is driven by Serial Peripheral Interface (SPI) (the SPI-Serial Peripheral Interface) module of MCU.The chip of MCU is selected CS, serial clock SCK, is mainly gone out from going into MOSI, mainly going into from going out the MISO pin to connect and be connected with LCD display CS, CLK, MISO, MOSI pin respectively; The data presentation of LCD, by MCU through the mode of the tabling look-up realization of decoding.
Claims (1)
1. the insulation resistance detector of a vehicle mounted dynamic battery is characterized in that: be made up of microcontroller, anodal insulated switch circuit, negative pole insulated switch circuit, operational amplification circuit, voltage isolation circuit, controller area network transceiver and LCD display; Wherein, the general input/output module of microcontroller, the control end of external anodal insulation light coupling relay, the GPIO module of microcontroller, the control end of external negative pole insulation light coupling relay, output insulation resistance sampled voltage; The insulation resistance sampled voltage connects voltage isolation circuit through operational amplification circuit again; The communication module of microcontroller, after CAN transceiver level conversion, the form with message sends insulating resistance value to BMS; Microcontroller is connected with the LCD screen of man-machine interaction unit and shows the electrokinetic cell insulating resistance value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120174840U CN202133761U (en) | 2011-05-29 | 2011-05-29 | Insulation resistance detector of vehicle power cells |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120174840U CN202133761U (en) | 2011-05-29 | 2011-05-29 | Insulation resistance detector of vehicle power cells |
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| Publication Number | Publication Date |
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| CN202133761U true CN202133761U (en) | 2012-02-01 |
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| CN201120174840U Expired - Lifetime CN202133761U (en) | 2011-05-29 | 2011-05-29 | Insulation resistance detector of vehicle power cells |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105589044A (en) * | 2015-12-09 | 2016-05-18 | 天津市捷威动力工业有限公司 | Automatic test system and test method for testing function of power battery pack |
-
2011
- 2011-05-29 CN CN201120174840U patent/CN202133761U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105589044A (en) * | 2015-12-09 | 2016-05-18 | 天津市捷威动力工业有限公司 | Automatic test system and test method for testing function of power battery pack |
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| GR01 | Patent grant | ||
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| CX01 | Expiry of patent term |
Granted publication date: 20120201 |