CN207336700U - A kind of insulation detecting circuit for electric car high-voltage isulation detecting system - Google Patents
A kind of insulation detecting circuit for electric car high-voltage isulation detecting system Download PDFInfo
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- CN207336700U CN207336700U CN201721321511.9U CN201721321511U CN207336700U CN 207336700 U CN207336700 U CN 207336700U CN 201721321511 U CN201721321511 U CN 201721321511U CN 207336700 U CN207336700 U CN 207336700U
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Abstract
The utility model provides a kind of insulation detecting circuit for electric car high-voltage isulation detecting system, and the insulation detecting circuit is made of the first capacitance and four groups of detection units, and every group of detection unit is composed in series by a resistance and a switch；First detection unit one end connects the cathode of power battery pack, and the other end is connected with second detection unit one end, second detection unit other end connection vehicle body；3rd detection unit one end connects the anode of power battery pack, and the other end is connected with the 4th detection unit one end, the 4th detection unit other end connection vehicle body；First capacitance connection is between first detection unit and second detection unit connecting place and the 3rd detection unit and the 4th detection unit connecting place.The utility model can realize the insulation resistance value quickly and efficiently detected between battery high-pressure system and vehicle body, prevent high-tension system from being run in the case of insulation fault, to improve the security of people's car.
Description
Technical field
The utility model belongs to Motor vehicle security detection technique field, is related to high-voltage isulation detection technique, and in particular to
A kind of insulation detecting circuit for electric car high-voltage isulation detecting system.
Background technology
The high-tension battery group that the power resources of electric car are carried in it, the operating voltage of power battery pack is higher, then to electricity
The requirement of insulation performance between pond high-pressure system and bodywork system is also higher.Vehicle requires high-pressure system and low-pressure system necessary
It is completely isolated, prevent leakage current from being damaged when being more than human-body safety electric current to human body, or because Insulation Problems influence in-car control
The performance of device.Therefore, electrokinetic cell system needs very reliable insulating properties, to ensure the normal operation of electric vehicle and make
The safety of user.
Existing insulation detecting method mainly has " electric resistance partial pressure method " and " bridge balance principle method ".Wherein, electric resistance partial pressure
Method is by, to introducing resistance between vehicle body, insulation resistance resistance being calculated according to the principle of electric resistance partial pressure in high-pressure system positive and negative anodes
Value；And bridge balance principle method is the voltage letter of electric bridge unbalance generation when detection insulation resistance is low using the bridge structure built
Number, and then measure insulation resistance.
In above-mentioned existing two kinds of insulation detecting methods：
1st, " electric resistance partial pressure method " often needs to introduce resistance, artificially causes insulation to reduce, and hardware configuration is more complicated, behaviour
Make and use is upper not convenient enough, cause detection efficiency to reduce；
2nd, " bridge balance principle method " can not detect the situation when insulation of electrokinetic cell system positive and negative electrode is equal to be declined, and lead
Cause this method in practice there are limitation, there are blind area, cause the reliability of detection reduces detection process.
Utility model content
For above-mentioned defect existing in the prior art, the utility model provides a kind of for electric car high-voltage isulation inspection
The insulation detecting circuit of examining system, to realize the insulation resistance value quickly and efficiently detected between battery high-pressure system and vehicle body, prevents
Only high-tension system is run in the case of insulation fault, to improve the security of people's car.With reference to Figure of description, the utility model
Technical solution it is as follows：
A kind of insulation detecting circuit for electric car high-voltage isulation detecting system, the insulation detecting circuit is by the first electricity
Hold and four groups of detection units form, every group of detection unit is composed in series by a resistance and a switch；
First detection unit one end connects the cathode of power battery pack, and the other end is connected with second detection unit one end, the
Two detection unit other ends connection vehicle body；
3rd detection unit one end connects the anode of power battery pack, and the other end is connected with the 4th detection unit one end, the
Four detection unit other ends connection vehicle body；
First capacitance connection is in first detection unit and second detection unit connecting place and the 3rd detection unit and
Between four detection unit connecting places.
Further, the switch is regular tap, metal-oxide-semiconductor, optocoupler or magnetic coupling.
Compared with prior art, the beneficial effects of the utility model are：
1st, insulation detecting circuit the putting based on capacitance described in the utility model for electric car high-voltage isulation detecting system
Piezoelectric voltage formulaPrinciple, the capacitance both end voltage measured according to different conditions, and then obtain anode
Insulating resistance value with anode to vehicle body ground, design principle is simple, simple operation, easily realization；
2nd, the insulation detecting circuit described in the utility model for electric car high-voltage isulation detecting system is suitable by selecting
Capacitance, you can stablized, accuracy is high, fast response time and reliable measurement result.
3rd, insulation detecting circuit the filling by capacitance described in the utility model for electric car high-voltage isulation detecting system
Electricity and electric discharge, can measure the insulating resistance value of battery anode and anode to vehicle body ground respectively, and same in positive and negative anodes insulation
When can also realize the purpose that insulation resistance value measures respectively when declining, it is as a result accurately, with strong points, decline rear vehicle easy to insulate
Diagnosis and maintenance；
4th, the insulation detecting circuit described in the utility model for electric car high-voltage isulation detecting system passes through controlling switch
Realize the discharge and recharge of capacitance, when system closes Insulation monitoring function or power-off, all to switch off, high and low pressure system of vehicle
Between will not introduce extra insulation resistance because of detecting system；
5th, in the insulation detecting circuit described in the utility model for electric car high-voltage isulation detecting system capacitance charge and discharge
Piezoelectric voltage is not above battery voltage, therefore the voltage class when carrying out Insulation monitoring is suitable with battery pack, will not introduce
Higher than the signal of battery voltage, the original high and low pressure system of vehicle is influenced small.
Brief description of the drawings
Fig. 1 is the insulation detecting circuit schematic diagram described in the utility model for electric car high-voltage isulation detecting system；
Fig. 2 is workflow frame of the insulation detecting circuit described in the utility model in electric car high-voltage isulation detecting system
Figure.
Embodiment
For the technical solution of the utility model is expanded on further, with reference to Figure of description, the specific implementation of the utility model
Mode is as follows：
The utility model provides a kind of insulation detecting circuit for electric car high-voltage isulation detecting system, such as Fig. 1 institutes
Show, the insulation detecting circuit is with being connected to power battery pack B and vehicle body between GND, insulation of the battery anode to vehicle body ground
Resistance is Rp, and battery electrode is Rn to the insulation resistance on vehicle body ground, and the insulation detecting circuit is by the first capacitance C1 and four groups
It is made of resistance R and switch the S detection unit being composed in series；Wherein, first detection unit is by first resistor R1 and first switch
S1 is composed in series；Second detection unit is composed in series by second resistance R2 and second switch S2；3rd detection unit is by the 3rd electricity
The switches of resistance R3 and the 3rd S3 is composed in series；4th detection unit is composed in series by the switches of the 4th resistance R4 and the 4th S4；First electricity
The cathode of one end connection power battery pack B of R1 is hindered, the other end of first resistor R1 is connected with one end of first switch S1, and first
The other end of switch S1 is connected with one end of second resistance R2, and the other end of second resistance R2 connects with one end of second switch S2
Connect, the other end of second switch S2 connection vehicle body ground GND；The anode of one end connection power battery pack B of 3rd resistor R3, the 3rd
The other end of resistance R3 is connected with one end of the 3rd switch S3, and the other end of the 3rd switch S3 and one end of the 4th resistance R4 connect
Connect, the other end of the 4th resistance R4 be connected with one end of the 4th switch S4, and the other end of the 4th switch S4 connects vehicle body ground GND；
Opened with the adjacent the 3rd at any point that the first capacitance C1 is connected between adjacent first switch S1 and second resistance R2
Any point between the S3 and the 4th resistance R4 of pass.
The first switch S1, second switch S2, the 3rd switch S3 and the 4th switch S4 are using regular tap, metal-oxide-semiconductor, light
Coupling, magnetic coupling etc. have the device of switching function.
As shown in Fig. 2, insulation detecting circuit described in the utility model is specific in electric car high-voltage isulation detecting system
The course of work is as follows：
Step 1：Microcontroller by ON-OFF control circuit control first switch S1, second switch S2, the 3rd switch S3 and
4th switch S4 is disconnected, and Insulation monitoring is in original state, and is prepared to enter into first state；
Step 2：Insulation monitoring proceeds by first state, and microcontroller controls first switch by ON-OFF control circuit
S1 and the 3rd switch S3 closure, and second switch S2 and the 4th switch S4 disconnect, at this time, power battery pack B, first resistor R1,
First capacitance C1 and 3rd resistor R3 series connection forming circuits, electric current is flowed out from the cathode of power battery pack B, by first resistor
After R1, the first capacitance C1 and 3rd resistor R3, the anode of power battery pack B, the first capacitance C1 chargings are flowed back to；First capacitance C1
In charging process, microcontroller detects the voltage at the first capacitance C1 both ends by tension measuring circuit in real time, until the first capacitance
The voltage at C1 both ends reaches power battery voltage U0, microcontroller is to power battery voltage U0Recorded, Insulation monitoring terminates
One state, and it is prepared to enter into the second state；
Step 3：Insulation monitoring proceeds by the second state, and microcontroller controls first switch by ON-OFF control circuit
The switch S4 closures of S1 and the 4th, and the switches of second switch S2 and the 3rd S3 is disconnected, at this time, the first capacitance C1, first resistor R1, electricity
Pond group cathode insulation resistance Rp and the 4th resistance R4 series connection forming circuit, the first capacitance C1 electric discharges to vehicle body；Electric current from
One end outflow of first capacitance C1, by first resistor R1, battery anode insulation resistance Rp and the 4th resistance R4 to vehicle body
Afterwards, during the other end for flowing back to the first capacitance C1, microcontroller detects that elapsed time is second by timer
State for time t2, microcontroller by tension measuring circuit detect the first capacitance C1 both ends voltage reach the second of-state voltage U2,
Microcontroller is to the second state for time t2With the second of-state voltage U2Recorded, Insulation monitoring terminates the second state, and prepare into
Enter the third state；
Step 4：Insulation monitoring proceeds by the third state, and microcontroller passes through ON-OFF control circuit secondary control first again
The switch S3 closures of S1 and the 3rd are switched, and the switches of second switch S2 and the 4th S4 is disconnected, at this time, power battery pack B, first resistor
R1, the first capacitance C1 and 3rd resistor R3 connect forming circuit again, and the first capacitance C1 charges again；First capacitance C1 charges
During, microcontroller detects the voltage at the first capacitance C1 both ends by tension measuring circuit in real time, until the first capacitance C1 two
The voltage at end reaches power battery voltage U again0, microcontroller is to power battery voltage U0Recorded, Insulation monitoring terminates
Three condition, and it is prepared to enter into the 4th state；
Step 5：Insulation monitoring proceeds by the 4th state, and microcontroller controls second switch by ON-OFF control circuit
The switch S3 closures of S2 and the 3rd, and the switches of first switch S1 and the 4th S4 is disconnected, at this time, the first capacitance C1, second resistance R2, electricity
Pond group anode insulation resistance Rn and 3rd resistor R3 series connection forming circuit, the first capacitance C1 electric discharges to vehicle body；Electric current from
One end outflow of first capacitance C1, by second resistance R2, battery electrode insulation resistance Rn and 3rd resistor R3 to vehicle body
Afterwards, during the other end for flowing back to the first capacitance C1, microcontroller detects that elapsed time is the 4th by timer
State for time t3, microcontroller by tension measuring circuit detect the first capacitance C1 both ends voltage reach the 4th of-state voltage U3,
Microcontroller is to the 4th state for time t3With the 4th of-state voltage U3Recorded, Insulation monitoring terminates the 4th state, and prepare into
Enter calculating and communications status；
Step 6：Into calculating and communications status, according to the discharge voltage formula of capacitance：
The voltage difference formula for obtaining the first capacitance C1 both ends after first state and the second state is：
The voltage difference formula for obtaining the first capacitance C1 both ends after the third state and the 4th state is：
In above-mentioned formula：U0For power battery voltage；U2For the first capacitance both end voltage after the second state, i.e., foregoing
Two-state voltage；t2For the second state for time；U3For the first capacitance both end voltage after the 4th state, i.e., foregoing 4th of-state voltage；
t3For the 4th state for time；E is natural constant；C1 is the capacitance of the first capacitance；R1 is the resistance value of first resistor；R2 is second
The resistance value of resistance；R3 is the resistance value of 3rd resistor；R4 is the resistance value of the 4th resistance；Rp is battery anode insulated electro to vehicle body
Resistance；Rn is battery electrode insulation resistance to vehicle body；
In above-mentioned formula, in addition to Rp and Rn, other amounts are known quantity, are by the reverse derivation calculating of above-mentioned formula
Battery anode insulation resistance Rp and battery electrode insulation resistance Rn, and then i.e. detectable can be obtained to vehicle body to vehicle body
And with the judging power battery pack B and vehicle body state of insulation between GND.
Claims (2)
- A kind of 1. insulation detecting circuit for electric car high-voltage isulation detecting system, it is characterised in that：The insulation detecting circuit is made of the first capacitance and four groups of detection units, and every group of detection unit is by a resistance and one Switch is composed in series；First detection unit one end connects the cathode of power battery pack, and the other end is connected with second detection unit one end, the second inspection With surveying unit other end connection vehicle body；3rd detection unit one end connects the anode of power battery pack, and the other end is connected with the 4th detection unit one end, the 4th inspection With surveying unit other end connection vehicle body；First capacitance connection is examined in first detection unit and second detection unit connecting place and the 3rd detection unit and the 4th Survey between unit connecting place.
- A kind of 2. insulation detecting circuit for electric car high-voltage isulation detecting system as claimed in claim 1, it is characterised in that：The switch is regular tap, metal-oxide-semiconductor, optocoupler or magnetic coupling.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721321511.9U CN207336700U (en) | 2017-10-13 | 2017-10-13 | A kind of insulation detecting circuit for electric car high-voltage isulation detecting system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721321511.9U CN207336700U (en) | 2017-10-13 | 2017-10-13 | A kind of insulation detecting circuit for electric car high-voltage isulation detecting system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112513651A (en) * | 2018-08-06 | 2021-03-16 | 宁波吉利汽车研究开发有限公司 | Method for detecting insulation faults |
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- 2017-10-13 CN CN201721321511.9U patent/CN207336700U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112513651A (en) * | 2018-08-06 | 2021-03-16 | 宁波吉利汽车研究开发有限公司 | Method for detecting insulation faults |
| CN112513651B (en) * | 2018-08-06 | 2023-09-08 | 宁波吉利汽车研究开发有限公司 | Method for detecting insulation faults |
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