CN206301000U - A kind of insulating resistor detecting circuit with self-diagnostic function - Google Patents
A kind of insulating resistor detecting circuit with self-diagnostic function Download PDFInfo
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- CN206301000U CN206301000U CN201621434517.2U CN201621434517U CN206301000U CN 206301000 U CN206301000 U CN 206301000U CN 201621434517 U CN201621434517 U CN 201621434517U CN 206301000 U CN206301000 U CN 206301000U
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Abstract
The utility model is related to a kind of insulating resistor detecting circuit with self-diagnostic function, including：Voltage stabilizing driver element, detection electric capacity, the first correction resistance, first switch, second switch, voltage acquisition module and microprocessing unit.First output end of the microprocessing unit is connected with the input of the voltage stabilizing driver element, and the first input end of the microprocessing unit is connected with the output end of the voltage acquisition module.One end of the detection electric capacity is connected with the output end of the voltage stabilizing driver element and the input of the voltage acquisition module respectively, and the other end of the detection electric capacity is connected with the input of the first switch and the input of the second switch respectively.One end of the first correction resistance is connected with the output end of the first switch, and the other end of the first correction resistance is connected with vehicle ground, and the output end of the second switch is used as insulaion resistance test side.The utility model can improve the accuracy of vehicle insulaion resistance detection.
Description
Technical field
The utility model is related to automobile insulating resistor detection field, more particularly to a kind of insulated electro with self-diagnostic function
Resistance detection circuit.
Background technology
Electric automobile has been increasingly becoming the important directions of mankind's automotive technology development, and the safety of vehicle is mainly reflected in height
Pressure safety, then in whole high-voltage safety, insulaion resistance this index just embodies the security of vehicle high pressure, and high voltage protection is
The no security for being rationally just related to vehicle driver and crew.Existing insulaion resistance detection scheme mainly includes partial pressure bridge
Two kinds of detection modes of insulaion resistance detection scheme and low-frequency pulse injection method of formula, wherein partial pressure bridge-type insulating resistor detecting circuit
It is that the state for having to depend on whole high tension loop to be to turn on can just carry out insulaion resistance detection, and low-frequency pulse injection method
Insulaion resistance detection mode, the then limitation that be must be turned on without high tension loop.Therefore low-frequency pulse injection method is often selected, but the method
Detection signal is easily influenceed by outer signals, and Chang Wufa determines whether testing result is accurate.
Utility model content
The utility model provides a kind of insulating resistor detecting circuit with self-diagnostic function, solves existing use low frequency note
When entering method detection vehicle insulaion resistance, it is impossible to judge the whether accurate problem of result of detection, the detection of vehicle insulaion resistance is improved
Accuracy.
To realize object above, the utility model provides following technical scheme：
A kind of insulating resistor detecting circuit with self-diagnostic function, including：Voltage stabilizing driver element, detection electric capacity, first
Correction resistance, first switch, second switch, voltage acquisition module and microprocessing unit；
First output end of the microprocessing unit is connected with the input of the voltage stabilizing driver element, the microprocessor list
The first input end of unit is connected with the output end of the voltage acquisition module；
One end of the detection electric capacity respectively with the output end of the voltage stabilizing driver element and the voltage acquisition module
Input be connected, it is described detection electric capacity the other end respectively with the input of the input and the second switch of the first switch
End is connected；
One end of the first correction resistance is connected with the output end of the first switch, and described first corrects the another of resistance
One end is connected with vehicle ground；
The output end of the second switch is used as insulaion resistance test side；
The first output end output of the microprocessing unit continues low frequency pulse signal, is closed in first switch and second opens
In the setting time that shut-off is opened, the microprocessing unit is fitted according to the level signal of the first input end of the microprocessing unit
First voltage curve, and compared with the first setting curve according to the first voltage curve and obtain the first average voltage difference, such as
Really described first average voltage difference is less than given threshold, then report detection circuit normal information, otherwise reports detection circuit different
Normal information.
Preferably, also including the second correction resistance and the 3rd switch；
One end of the second correction resistance is connected with the output end of the described 3rd switch, and described second corrects the another of resistance
One end is connected with vehicle ground, and the input of the 3rd switch is connected with the other end of the detection electric capacity；
It is described in the described 3rd switch closure, and in the first switch and the setting time of second switch disconnection
Microprocessing unit is fitted second voltage curve according to the level signal of the first input end of the microprocessing unit, and according to described
Second voltage curve compares with the second setting curve and obtains the second average voltage difference, if the second average voltage difference is small
In the given threshold, then the microprocessing unit reports detection circuit normal information, otherwise reports detection circuit abnormality information.
Preferably, the second correction resistance is more than the described first electric group of correction, and the second correction resistance is 100~
200M Ω, the first correction resistance is 100~200K Ω.
Preferably, the first switch, the second switch and the 3rd switch are normal open switch.
Preferably, the first switch, the second switch and the 3rd switch are relay；
The control end of the first switch is connected with the second output end of the microprocessing unit, the control of the second switch
End processed is connected with the 3rd output end of the microprocessing unit, and the of control end and the microprocessing unit of the 3rd switch
Four output ends are connected.
Preferably, the voltage acquisition module includes：Voltage follower, AD conversion module, sampling resistor and current-limiting resistance；
The input of the voltage follower is connected with one end of the sampling resistor, and the other end of the sampling resistor is made
It is the input of the voltage acquisition module, the output end of the voltage follower is connected with one end of the current-limiting resistance, institute
The other end for stating current-limiting resistance is connected with the input of the AD conversion module, and the output end of the AD conversion module is used as described
The output end of voltage acquisition module.
Preferably, the microprocessing unit includes pwm signal generation module, and the pwm signal generation module is by described
First output end output pwm signal of microprocessing unit, the high level of the pwm signal is 5V, and low level signal is 0V.
Preferably, the voltage stabilizing driver element includes：Buffer, driving resistance and build-out resistor；
The input of the buffer with it is described driving resistance one end be connected, the output end of the buffer with described
One end with resistance is connected；
It is described drive resistance the other end as the voltage stabilizing driver element input, the other end of the build-out resistor
As the output end of the voltage stabilizing driver element.
Preferably, the microprocessing unit is single-chip microcomputer.
The utility model provides a kind of insulating resistor detecting circuit with self-diagnostic function, by correction resistance detection
The voltage curve for obtaining judges whether the testing result of the detection circuit is accurate compared with setting voltage curve.Solve
During existing use low frequency injection method detection vehicle insulaion resistance, it is impossible to judge the whether accurate problem of result of detection, improve whole
The accuracy of car insulaion resistance detection.
Brief description of the drawings
In order to illustrate more clearly of specific embodiment of the utility model, below will be attached to what is used needed for embodiment
Figure is briefly described.
Fig. 1：It is a kind of insulating resistor detecting circuit schematic diagram with self-diagnostic function of the utility model offer.
Reference
1 voltage stabilizing driver element
2 voltage acquisition units
3 insulaion resistance test sides
CC1 detects electric capacity
UC1 buffers
RC1 drives resistance
RC2 build-out resistors
RC3 sampling resistors
RC4 current-limiting resistances
R01 first resistors
R02 second resistances
K1 first switches
K2 the 3rd is switched
K3 second switches
Specific embodiment
In order that those skilled in the art more fully understand scheme of the present utility model, below in conjunction with the accompanying drawings and embodiment party
Formula is described in further detail to the utility model embodiment.
For the detection of the insulaion resistance of current electric automobile, outer signals are vulnerable to using the detection of low-frequency pulse injection method
Influence, Chang Wufa determines whether testing result accurate.The utility model provides a kind of insulaion resistance with self-diagnostic function
Detection circuit, it is electric to judge the detection compared with setting voltage curve by the voltage curve obtained to correction resistance detection
Whether the testing result on road is accurate.When solving existing use low frequency injection method detection vehicle insulaion resistance, it is impossible to judge detection
The whether accurate problem of result, improve the accuracy of vehicle insulaion resistance detection.
As shown in figure 1, for a kind of insulating resistor detecting circuit with self-diagnostic function that the utility model is provided is illustrated
Figure.The circuit includes：Voltage stabilizing driver element 1, detection electric capacity CC1, the first correction resistance R01, first switch K1, second switch
K3, voltage acquisition module 2 and microprocessing unit.First output end of the microprocessing unit and the input of voltage stabilizing driver element 1
End is connected, and the first input end of the microprocessing unit is connected with the output end of voltage acquisition module 2.The one of detection electric capacity CC1
End is connected with the output end of voltage stabilizing driver element 1 and the input of voltage acquisition module 2 respectively, the other end of detection electric capacity CC1
It is connected with the input of first switch K1 and the input of second switch K3 respectively.One end and first of first correction resistance R01
The output end for switching K1 is connected, and the other end of the first correction resistance R01 is connected with vehicle ground.The output end conduct of second switch K3
Insulaion resistance test side 3.The first output end output of the microprocessing unit continues low frequency pulse signal, in first switch closure
And in the setting time of second switch disconnection, level of the microprocessing unit according to the first input end of the microprocessing unit
Signal fitting first voltage curve, and compared with the first setting curve according to the first voltage curve and obtain the first average voltage
Difference, if the first average voltage difference is less than given threshold, reports detection circuit normal information, otherwise reports detection
Circuit abnormality information.
Specifically, when the first output end of the microprocessing unit is high level, by detection electric capacity CC1 and insulated electro
Corresponding partial pressure will be obtained on the comprehensive impedance that resistance or the first correction resistant series are constituted, the microprocessing unit is adopted by voltage
Collection module obtains the level signal of the partial pressure, and the level signal becomes with the magnitude of voltage of the first output end of the microprocessing unit
Greatly.Similarly, when the output end of the microprocessing unit is low level, will be logical in the electric charge of the interpolar storages of detection electric capacity CC1 two
Overdischarge loop is discharged, so that voltage electricity sends the first input end of the microprocessing unit to by voltage acquisition module,
Now the level signal of partial pressure can be gradually reduced.Within a certain period of time, the voltage curve that the microprocessing unit is collected with it is pre-
If first voltage curve ratio it is corresponding with the first correction resistance compared with, first voltage curve, can be obtained by testing, and then judge
Whether the testing result of the circuit is accurate.
Further, also include：Second correction resistance R02 and the 3rd switch K2.One end and the 3rd of second correction resistance R02
The output end for switching K2 is connected, and the other end of the second correction resistance R02 is connected with vehicle ground, and the 3rd switchs input and the inspection of K2
The other end for surveying electric capacity CC1 is connected.In the 3rd switch K2 closures, and the setting time that first switch K1 and second switch K3 disconnects
Interior, the microprocessing unit is fitted second voltage curve according to the level signal of the first input end of the microprocessing unit, and
Compared with the second setting curve according to the second voltage curve and obtain the second average voltage difference, if the described second average electricity
Pressure difference is less than the given threshold, then report detection circuit normal information, otherwise reports detection circuit abnormality information.
It is standing to put the second correction resistance R02 more than described in order to carry out insulaion resistance detection to different automobile types
First correction electricity R01, in actual applications, second corrects resistance of the resistance R02 frequently with 100~200M Ω scopes, the first school
Resistance of the positive resistance R01 frequently with 100~200K Ω scopes.So that the circuit can be carried out accurately to a range of insulaion resistance
Detection.
Further, first switch K1, second switch K3 and the 3rd switch K2 are normal open switch.
Further, first switch K1, second switch K3 and the 3rd switch K2 are relay.The control end of first switch K1
It is connected with the second output end of the microprocessing unit, the control end of second switch K2 is exported with the 3rd of the microprocessing unit the
End is connected, and the control end of the 3rd switch K3 is connected with the 4th output end of the microprocessing unit.
The voltage acquisition module 2 includes：Voltage follower UC2, AD conversion module, sampling resistor RC3 and current-limiting resistance
RC4.The input of voltage follower UC2 is connected with one end of sampling resistor RC3, and the other end of sampling resistor RC3 is used as described
The input of voltage acquisition module 2, the output end of voltage follower UC2 is connected with one end of current-limiting resistance RC4, current-limiting resistance
The other end of RC4 is connected with the input of the AD conversion module, and the output end of the AD conversion module is adopted as the voltage
Collect the output end of module 2.
In actual applications, often using the pwm signal of certain dutycycle as low frequency pulse signal.The microprocessing unit
Including pwm signal generation module, the pwm signal generation module exports PWM by the first output end of the microprocessing unit
Signal, the high level of the pwm signal is 5V, and low level signal is 0V.
The voltage stabilizing driver element 1 includes：Buffer UC1, driving resistance RC1 and build-out resistor RC2.The buffer
The input of UC1 is connected with one end of resistance RC1 is driven, and the output end of buffer UC1 is connected with one end of build-out resistor RC2.
Drive the other end of resistance RC1 as the input of voltage stabilizing driver element 1, the other end of build-out resistor RC2 drives as voltage stabilizing
The output end of unit 1.
Specifically, the buffer UC1 is used to receive low frequency digital amount pulse signal, and full scale ground output amplitude is base
The analog quantity pulse signal of quasi- voltage, one end of circuit is connected with the output end of the microprocessing unit, and the other end is used as detection
Hold matched resistance RC1 to be electrically connected with the output end of buffer UC1, believed with forming the detection with exchange feature in test side
Number.It should be noted that the corresponding terminals of buffer UC1 are also connected with power supply VCC and ground connection GND, filtered electrical can be also introduced
Appearance and diode ensure the noiseless wave action of signal for being input into and exporting.
It should be noted that the microprocessing unit can be adopted as chip microcontroller.
It can be seen that, the utility model provides a kind of insulating resistor detecting circuit with self-diagnostic function, by correction electricity
The voltage curve that resistance detection is obtained judges whether the testing result of the detection circuit is accurate compared with setting voltage curve.
When solving existing use low frequency injection method detection vehicle insulaion resistance, it is impossible to judge the whether accurate problem of result of detection,
Improve the accuracy of vehicle insulaion resistance detection.
Construction of the present utility model, feature and action effect is described in detail according to diagrammatically shown embodiment above, with
Upper described is only preferred embodiment of the present utility model, but the utility model is not to limit practical range shown in drawing, it is every according to
According to the made change of conception of the present utility model, or the Equivalent embodiments of equivalent variations are revised as, still without departing from specification and figure
Show covered it is spiritual when, all should be in protection domain of the present utility model.
Claims (9)
1. a kind of insulating resistor detecting circuit with self-diagnostic function, it is characterised in that including：Voltage stabilizing driver element, detection
Electric capacity, the first correction resistance, first switch, second switch, voltage acquisition module and microprocessing unit；
First output end of the microprocessing unit is connected with the input of the voltage stabilizing driver element, the microprocessing unit
First input end is connected with the output end of the voltage acquisition module；
It is described detection electric capacity one end respectively with the input of the output end and the voltage acquisition module of the voltage stabilizing driver element
End be connected, it is described detection electric capacity the other end respectively with the input and the input phase of the second switch of the first switch
Even；
One end of the first correction resistance is connected with the output end of the first switch, the other end of the first correction resistance
It is connected with vehicle；
The output end of the second switch is used as insulaion resistance test side；
The first output end output of the microprocessing unit continues low frequency pulse signal, is closed in first switch and second switch is disconnected
In the setting time opened, the microprocessing unit is according to the level signal of the first input end of microprocessing unit fitting first
Voltage curve, and compared with the first setting curve according to the first voltage curve and obtain the first average voltage difference, if institute
The first average voltage difference is stated less than given threshold, then reports detection circuit normal information, otherwise report detection circuit abnormality to believe
Breath.
2. detection circuit according to claim 1, it is characterised in that also including the second correction resistance and the 3rd switch；
One end of the second correction resistance is connected with the output end of the described 3rd switch, the other end of the second correction resistance
It is connected with vehicle, the input of the 3rd switch is connected with the other end of the detection electric capacity；
In the described 3rd switch closure, and in the first switch and the setting time of second switch disconnection, micro- place
Reason unit is fitted second voltage curve according to the level signal of the first input end of the microprocessing unit, and according to described second
Voltage curve compares with the second setting curve and obtains the second average voltage difference, if the second average voltage difference is less than institute
Given threshold is stated, then reports detection circuit normal information, otherwise report detection circuit abnormality information.
3. detection circuit according to claim 2, it is characterised in that the second correction resistance is more than the described first correction
Electric group, the second correction resistance is 100~200M Ω, and the first correction resistance is 100~200K Ω.
4. detection circuit according to claim 3, it is characterised in that the first switch, the second switch and described
3rd switch is normal open switch.
5. detection circuit according to claim 4, it is characterised in that the first switch, the second switch and described
3rd switch is relay；
The control end of the first switch is connected with the second output end of the microprocessing unit, the control end of the second switch
It is connected with the 3rd output end of the microprocessing unit, the control end of the 3rd switch is defeated with the 4th of the microprocessing unit the
Go out end to be connected.
6. detection circuit according to claim 5, it is characterised in that the voltage acquisition module includes：Voltage follower,
AD conversion module, sampling resistor and current-limiting resistance；
The input of the voltage follower is connected with one end of the sampling resistor, and the other end of the sampling resistor is used as institute
The input of voltage acquisition module is stated, the output end of the voltage follower is connected with one end of the current-limiting resistance, the limit
The other end of leakage resistance is connected with the input of the AD conversion module, and the output end of the AD conversion module is used as the voltage
The output end of acquisition module.
7. detection circuit according to claim 6, it is characterised in that the microprocessing unit includes that pwm signal generates mould
Block, the first output end output pwm signal that the pwm signal generation module passes through the microprocessing unit, the pwm signal
High level is 5V, and low level signal is 0V.
8. detection circuit according to claim 7, it is characterised in that the voltage stabilizing driver element includes：Buffer, driving
Resistance and build-out resistor；
The input of the buffer is connected with one end of the driving resistance, and the output end of the buffer matches electricity with described
One end of resistance is connected；
It is described drive resistance the other end as the voltage stabilizing driver element input, the other end conduct of the build-out resistor
The output end of the voltage stabilizing driver element.
9. the detection circuit according to any one of claim 1 to 8, it is characterised in that the microprocessing unit is single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621434517.2U CN206301000U (en) | 2016-12-23 | 2016-12-23 | A kind of insulating resistor detecting circuit with self-diagnostic function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621434517.2U CN206301000U (en) | 2016-12-23 | 2016-12-23 | A kind of insulating resistor detecting circuit with self-diagnostic function |
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| Publication Number | Publication Date |
|---|---|
| CN206301000U true CN206301000U (en) | 2017-07-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621434517.2U Expired - Fee Related CN206301000U (en) | 2016-12-23 | 2016-12-23 | A kind of insulating resistor detecting circuit with self-diagnostic function |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108333548A (en) * | 2017-12-30 | 2018-07-27 | 宁德时代新能源科技股份有限公司 | Insulation resistance measuring apparatus and fault self-diagnosis method |
| CN109061307A (en) * | 2018-09-06 | 2018-12-21 | 北京长城华冠汽车科技股份有限公司 | The method for diagnosing faults of insulating resistor detecting circuit |
| CN110879323A (en) * | 2019-11-29 | 2020-03-13 | 安徽江淮汽车集团股份有限公司 | Vehicle false alarm prevention insulation detection circuit |
| CN111060791A (en) * | 2019-12-30 | 2020-04-24 | 华人运通(江苏)技术有限公司 | Insulation fault detection method and device, electric vehicle, terminal equipment and medium |
-
2016
- 2016-12-23 CN CN201621434517.2U patent/CN206301000U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108333548A (en) * | 2017-12-30 | 2018-07-27 | 宁德时代新能源科技股份有限公司 | Insulation resistance measuring apparatus and fault self-diagnosis method |
| CN109061307A (en) * | 2018-09-06 | 2018-12-21 | 北京长城华冠汽车科技股份有限公司 | The method for diagnosing faults of insulating resistor detecting circuit |
| CN110879323A (en) * | 2019-11-29 | 2020-03-13 | 安徽江淮汽车集团股份有限公司 | Vehicle false alarm prevention insulation detection circuit |
| CN111060791A (en) * | 2019-12-30 | 2020-04-24 | 华人运通(江苏)技术有限公司 | Insulation fault detection method and device, electric vehicle, terminal equipment and medium |
| CN111060791B (en) * | 2019-12-30 | 2022-05-03 | 华人运通(江苏)技术有限公司 | Insulation fault detection method and device, electric vehicle, terminal equipment and medium |
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Granted publication date: 20170704 Termination date: 20191223 |