CN205120831U - Whole car insulation resistance's detecting system - Google Patents
Whole car insulation resistance's detecting system Download PDFInfo
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- CN205120831U CN205120831U CN201520955993.8U CN201520955993U CN205120831U CN 205120831 U CN205120831 U CN 205120831U CN 201520955993 U CN201520955993 U CN 201520955993U CN 205120831 U CN205120831 U CN 205120831U
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- insulation resistance
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Abstract
The utility model provides a whole car insulation resistance's detecting system, include: steady voltage drive module, sampling feedback module, MCU, test capacitor, first relay and second relay. Steady voltage drive module's input with MCU's first output links to each other, steady voltage drive module's output with the input of test capacitor links to each other, the sampling feedback module the output with MCU's input links to each other, the sampling feedback module the input with the input of test capacitor links to each other, the output of test capacitor respectively with the input of first relay with the input of second relay links to each other, the output of first relay links to each other with first sense terminal, the output of second relay links to each other with the second sense terminal. The utility model discloses can be applicable to battery package and high -pressure system load simultaneously and detect the insulation resistance on automobile body ground, improve the accuracy of insulation resistance detection, increase electric automobile's security.
Description
Technical field
The utility model relates to the detection field of insulation resistance, is specifically related to a kind of detection system of car load insulation resistance.
Background technology
The energy elements of electric automobile is the power accumulator of high pressure, and the voltage of battery side has up to hundreds of volt, i.e. the level of high voltage range.The key index of vehicle high voltage system safety is determined by its insulation degree, and the dielectric level of the high-voltage system of the battery management system monitoring vehicle of automobile, mainly realized by the measurement of the insulation resistance to car body.This insulation resistance mainly contains electrokinetic cell bag and the high-voltage system load insulation resistance to vehicle body ground, and high-voltage system load is the high voltage devices of being powered by high voltage contactor by the battery in high voltage range.Existing insulation resistance detects normal and measures the insulation resistance of power brick to vehicle body ground, and does not carry out insulation resistance detection to the load of high-pressure system, there is certain potential safety hazard.
Utility model content
The utility model provides a kind of detection system of car load insulation resistance, can be applicable to high-tension battery bag and the high-voltage system load insulation resistance to vehicle body ground simultaneously and detect, and improves accuracy that vehicle body insulation resistance detects and intelligent, increases the security of electric automobile.
For achieving the above object, the utility model provides following technical scheme:
A detection system for car load insulation resistance, is characterized in that, comprising: voltage stabilizing driver module, sampling feedback module, MCU, Detection capacitance, the first relay and the second relay;
The input end of described voltage stabilizing driver module is connected with first output terminal of described MCU, and the output terminal of described voltage stabilizing driver module is connected with the input end of described Detection capacitance;
The output terminal of described sampling feedback module is connected with the input end of described MCU, and the input end of described sampling feedback module is connected with the input end of described Detection capacitance;
The output terminal of described Detection capacitance is connected with the input end of described second relay with the input end of described first relay respectively;
The control end of described first relay is connected with second output terminal of described MCU, and the output terminal of described first relay is connected with the first test side;
The control end of described second relay is connected with the 3rd output terminal of described MCU, and the output terminal of described second relay is connected with the second test side;
Described sampling feedback module is used for carrying out voltage sample to described Detection capacitance and feeding back to described MCU;
First output terminal of described MCU exports square PWM level signal, and described MCU reports the insulating resistance value corresponding with the sampled value that described sampling feedback module exports;
Described voltage stabilizing driver module is used for carrying out voltage stabilizing driving to the level signal that described MCU exports.
Preferably, described voltage stabilizing driver module comprises: impact damper, driving resistance and build-out resistor;
The input end of described impact damper is connected with one end of described driving resistance, and the output terminal of described impact damper is connected with one end of described build-out resistor;
The other end of described driving resistance is as the input end of described voltage stabilizing driver module, and the other end of described build-out resistor is as the output terminal of described voltage stabilizing driver module.
Preferably, described sampling feedback module comprises: voltage follower, sampling resistor and current-limiting resistance;
The input end of described voltage follower is connected with one end of described sampling resistor, and the output terminal of described voltage follower is connected with one end of described current-limiting resistance;
The other end of described sampling resistor is as the input end of described sampling feedback module, and the other end of described current-limiting resistance is as the output terminal of described sampling feedback module.
Preferably, the positive terminals of described voltage follower are as the input end of described voltage follower, and the negative terminals of described voltage follower are connected with the output terminal of described voltage follower.
Preferably, when second output terminal of described MCU exports high level, described first relay is communicated with; When 3rd output terminal of described MCU exports high level, described second relay is communicated with.
Preferably, described first test side is the insulation resistance test side of power brick to vehicle body ground; Described second test side is the insulation resistance test side of high-voltage system load to vehicle body ground.
Preferably, the high level of described PWM level signal is 5V, and low level is 0V.
Preferably, described first relay and described second relay are normally opened relay.
Visible, the utility model provides a kind of detection system of car load insulation resistance, by controlling the break-make of the first relay and the second relay, realize high-tension battery bag and the high-voltage system load insulation resistance to vehicle body ground to detect, improve accuracy that vehicle body insulation resistance detects and intelligent, increase the security of electric automobile.
Accompanying drawing explanation
In order to be illustrated more clearly in specific embodiment of the utility model, be briefly described to the accompanying drawing used required in embodiment below.
Fig. 1: be a kind of car load insulation resistance detection system structural representation that the utility model provides;
Fig. 2: be a kind of car load insulating resistor detecting circuit that the utility model embodiment provides;
Fig. 3: be the voltage feedback signal oscillogram that the utility model embodiment provides.
Embodiment
In order to make those skilled in the art person understand scheme of the present utility model better, below in conjunction with drawings and embodiments, the utility model embodiment is described in further detail.
For the detection of the insulation resistance of current power automobile, normal only to the insulation resistance detection of high-tension battery bag to vehicle body ground, and cannot the insulation resistance of high-voltage system load be detected, there is certain potential safety hazard.The utility model provides a kind of car load insulation resistance detection system, by controlling the break-make of the first relay and the second relay, realize high-tension battery bag and the high-voltage system load insulation resistance to vehicle body ground to detect, improve accuracy that vehicle body insulation resistance detects and intelligent, increase the security of electric automobile.
As shown in Figure 1, be a kind of car load insulation resistance detection system structural representation that the utility model provides.This system comprises: voltage stabilizing driver module, sampling feedback module, MCU, Detection capacitance, the first relay and the second relay.The input end of described voltage stabilizing driver module is connected with first output terminal of described MCU, and the output terminal of described voltage stabilizing driver module is connected with the input end of described Detection capacitance.The output terminal of described sampling feedback module is connected with the input end of described MCU, and the input end of described sampling feedback module is connected with the input end of described Detection capacitance.The output terminal of described Detection capacitance is connected with the input end of described second relay with the input end of described first relay respectively.The control end of described first relay is connected with second output terminal of described MCU, and the output terminal of described first relay is connected with the first test side.The control end of described second relay is connected with the 3rd output terminal of described MCU, and the output terminal of described second relay is connected with the second test side.State sampling feedback module for carrying out voltage sample to described Detection capacitance and feeding back to described MCU.First output terminal of described MCU exports square PWM level signal, and described MCU reports the insulating resistance value corresponding with the sampled value that described sampling feedback module exports.Described voltage stabilizing driver module is used for carrying out voltage stabilizing driving to the level signal that described MCU exports.
As shown in Figure 2, be a kind of car load insulating resistor detecting circuit that the utility model embodiment provides.Described voltage stabilizing driver module comprises: impact damper UC1, driving resistance RC2 and build-out resistor RC1; The input end of described impact damper UC1 is connected with one end of described driving resistance RC2, and the output terminal of described impact damper UC1 is connected with one end of described build-out resistor RC1; The other end of described driving resistance RC2 is as the input end of described voltage stabilizing driver module, and the other end of described build-out resistor RC1 is as the output terminal of described voltage stabilizing driver module.
Particularly, described impact damper UC1 is for receiving low frequency digital amount pulse signal, and full scale ground output amplitude is the analog quantity pulse signal of reference voltage, one end of circuit is connected with the output terminal of described MCU, the other end is electrically connected with the output terminal of impact damper UC1 through build-out resistor RC1 as test side, to form the detection signal having and exchange feature in test side.It should be noted that, the corresponding terminals of impact damper UC1 are also connected with ground connection GND with power supply VCC, also can introduce filter capacitor and the noiseless wave action of the signal of input and output guaranteed by diode.
Meanwhile, described sampling feedback module comprises: voltage follower UC2, sampling resistor RC3 and current-limiting resistance RC4; The input end of described voltage follower UC2 is connected with one end of described sampling resistor RC3, and the output terminal of described voltage follower UC2 is connected with one end of described current-limiting resistance RC4; The other end of described sampling resistor RC3 is as the input end of described sampling feedback module, and the other end of described current-limiting resistance RC4 is as the output terminal of described sampling feedback module.
Further, the positive terminals of described voltage follower UC2 are as the input end of described voltage follower, and the negative terminals of described voltage follower UC2 are connected with the output terminal of described voltage follower.
Particularly, Detection capacitance CC1 one end is as pressure feedback port A1, and the other end of Detection capacitance CC1 is as test side.Pressure feedback port A1 is electrically connected with sampling resistor RC3 one end, the input end of voltage follower UC2 is connected by the other end of filtering current-limiting circuit with sampling resistor RC3, and the output terminal of voltage follower UC2 also sends feedback voltage to by filtering current-limiting circuit the input end of described MCU.
Such as, when the output terminal of described MCU is high level, by dividing potential drop corresponding for acquisition one on the comprehensive impedance in series to insulation resistance by Detection capacitance CC1, described MCU gets final product by the magnitude of voltage reading this voltage feedback signal the resistance that backwards calculation goes out current insulation resistance, the resistance of insulation resistance is larger, and the magnitude of voltage of the voltage feedback signal that feedback signal output exports is larger.In like manner, when the output terminal of described MCU is low level, the electric charge stored at Detection capacitance CC1 two interpolar will be discharged by discharge loop, thus make voltage feedback signal flow to the input end of described MCU by voltage follower UC2, and now the magnitude of voltage of voltage feedback signal can reduce gradually.As shown in Figure 3, for the voltage feedback signal oscillogram that the utility model embodiment provides, when described MCU exports square PWM ripple, the voltage feedback signal produced by car load insulating resistor detecting circuit is in wave shape, described MCU, according to voltage feedback signal oscillogram, judges the resistance of current insulation resistance in the amplitude Characteristics of one-period internal feedback signal.
It should be noted that, difference between the crest of voltage feedback signal and trough characterizes insulation resistance resistance size, therefore by realizing the demarcation to insulation resistance resistance to difference between the crest of voltage feedback signal waveform and trough, in actual testing process, MAP between being hindered by the difference and actual insulation of searching a crest and trough, realizes operating the detection of current insulation resistance resistance.Relate to standard according to automobile industry, automobile insulating resistor resistance standard should not be less than 500 Ω/V.Affect the stray capacitance because have Detection capacitance CC1 and vehicle body and battery high-pressure section of crest and trough difference, the electric capacity of general Detection capacitance CC1 is larger, then the difference of crest and trough is less, the excessive difference of crest and trough that also can make of stray capacitance diminishes simultaneously, makes crest acuity more slow.
Further, when second output terminal of described MCU exports high level, described first relay is communicated with; When 3rd output terminal of described MCU exports high level, described second relay is communicated with.
Described first test side is the insulation resistance test side of power brick to vehicle body ground; Described second test side is the insulation resistance test side of high-voltage system load to vehicle body ground.
Further, the high level of described PWM level signal is 5V, and low level is 0V.In practical application, also with other magnitude of voltage, mainly can limit according to the operating voltage range of MCU.
Further, described first relay K 1 and described second relay K 2 are normally opened relay.When high-voltage relay K3 is not closed, detect by the first relay K 1 and the second relay K 2 pairs of high-tension battery bags and the insulation resistance of high-voltage system load to vehicle body ground, when high-voltage relay K3 closes, then high-tension battery is unwrapped and is begun to power to high-voltage system load.
Visible, the utility model provides a kind of detection system of car load insulation resistance, by the break-make to the first relay and the second relay, high-tension battery bag and the high-voltage system load insulation resistance to vehicle body ground can be realized detect, improve accuracy that vehicle body insulation resistance detects and intelligent, increase the security of electric automobile.
Structure of the present utility model, feature and action effect is described in detail above according to the embodiment shown in diagram; the foregoing is only preferred embodiment of the present utility model; but the utility model does not limit practical range with shown in drawing; every change done according to conception of the present utility model; or be revised as the Equivalent embodiments of equivalent variations; do not exceed yet instructions with diagram contain spiritual time, all should in protection domain of the present utility model.
Claims (8)
1. a detection system for car load insulation resistance, is characterized in that, comprising: voltage stabilizing driver module, sampling feedback module, MCU, Detection capacitance, the first relay and the second relay;
The input end of described voltage stabilizing driver module is connected with first output terminal of described MCU, and the output terminal of described voltage stabilizing driver module is connected with the input end of described Detection capacitance;
The output terminal of described sampling feedback module is connected with the input end of described MCU, and the input end of described sampling feedback module is connected with the input end of described Detection capacitance;
The output terminal of described Detection capacitance is connected with the input end of described second relay with the input end of described first relay respectively;
The control end of described first relay is connected with second output terminal of described MCU, and the output terminal of described first relay is connected with the first test side;
The control end of described second relay is connected with the 3rd output terminal of described MCU, and the output terminal of described second relay is connected with the second test side;
Described sampling feedback module is used for carrying out voltage sample to described Detection capacitance and feeding back to described MCU;
First output terminal of described MCU exports square PWM level signal, and described MCU reports the insulating resistance value corresponding with the sampled value that described sampling feedback module exports;
Described voltage stabilizing driver module is used for carrying out voltage stabilizing driving to the level signal that described MCU exports.
2. the detection system of car load insulation resistance according to claim 1, is characterized in that, described voltage stabilizing driver module comprises: impact damper, driving resistance and build-out resistor;
The input end of described impact damper is connected with one end of described driving resistance, and the output terminal of described impact damper is connected with one end of described build-out resistor;
The other end of described driving resistance is as the input end of described voltage stabilizing driver module, and the other end of described build-out resistor is as the output terminal of described voltage stabilizing driver module.
3. the detection system of car load insulation resistance according to claim 1, is characterized in that, described sampling feedback module comprises: voltage follower, sampling resistor and current-limiting resistance;
The input end of described voltage follower is connected with one end of described sampling resistor, and the output terminal of described voltage follower is connected with one end of described current-limiting resistance;
The other end of described sampling resistor is as the input end of described sampling feedback module, and the other end of described current-limiting resistance is as the output terminal of described sampling feedback module.
4. the detection system of car load insulation resistance according to claim 3, it is characterized in that, the positive terminals of described voltage follower are as the input end of described voltage follower, and the negative terminals of described voltage follower are connected with the output terminal of described voltage follower.
5. the detection system of car load insulation resistance according to claim 1, is characterized in that, when second output terminal of described MCU exports high level, described first relay is communicated with; When 3rd output terminal of described MCU exports high level, described second relay is communicated with.
6. the detection system of car load insulation resistance according to claim 1, is characterized in that, described first test side is the insulation resistance test side of power brick to vehicle body ground; Described second test side is the insulation resistance test side of high-voltage system load to vehicle body ground.
7. the detection system of the car load insulation resistance according to any one of claim 1 to 6, is characterized in that, the high level of described PWM level signal is 5V, and low level is 0V.
8. the detection system of the car load insulation resistance according to any one of claim 1 to 6, is characterized in that, described first relay and described second relay are normally opened relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520955993.8U CN205120831U (en) | 2015-11-24 | 2015-11-24 | Whole car insulation resistance's detecting system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520955993.8U CN205120831U (en) | 2015-11-24 | 2015-11-24 | Whole car insulation resistance's detecting system |
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| CN205120831U true CN205120831U (en) | 2016-03-30 |
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| CN201520955993.8U Expired - Fee Related CN205120831U (en) | 2015-11-24 | 2015-11-24 | Whole car insulation resistance's detecting system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107356848A (en) * | 2017-08-23 | 2017-11-17 | 北京新能源汽车股份有限公司 | A kind of insulation detection device |
| CN107820571A (en) * | 2016-07-22 | 2018-03-20 | Cti韩国株式会社 | Electric automobile insulation estimation of stability device |
| CN107817431A (en) * | 2016-09-13 | 2018-03-20 | 北汽福田汽车股份有限公司 | The high-voltage isulation detecting system and fuel-cell vehicle of fuel-cell vehicle |
| CN108037427A (en) * | 2017-12-22 | 2018-05-15 | 东软集团股份有限公司 | A kind of equipment, dynamical system and automobile for detecting power battery pack insulating properties |
| CN110426556A (en) * | 2019-08-14 | 2019-11-08 | 江铃控股有限公司 | Vehicle megger test method and apparatus |
-
2015
- 2015-11-24 CN CN201520955993.8U patent/CN205120831U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107820571A (en) * | 2016-07-22 | 2018-03-20 | Cti韩国株式会社 | Electric automobile insulation estimation of stability device |
| CN107817431A (en) * | 2016-09-13 | 2018-03-20 | 北汽福田汽车股份有限公司 | The high-voltage isulation detecting system and fuel-cell vehicle of fuel-cell vehicle |
| CN107356848A (en) * | 2017-08-23 | 2017-11-17 | 北京新能源汽车股份有限公司 | A kind of insulation detection device |
| CN107356848B (en) * | 2017-08-23 | 2024-02-27 | 北京新能源汽车股份有限公司 | Insulation detection device |
| CN108037427A (en) * | 2017-12-22 | 2018-05-15 | 东软集团股份有限公司 | A kind of equipment, dynamical system and automobile for detecting power battery pack insulating properties |
| CN110426556A (en) * | 2019-08-14 | 2019-11-08 | 江铃控股有限公司 | Vehicle megger test method and apparatus |
| CN110426556B (en) * | 2019-08-14 | 2021-12-07 | 江铃控股有限公司 | Method for testing insulation resistance of whole vehicle |
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Legal Events
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| C14 | Grant of patent or utility model | ||
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| CP01 | Change in the name or title of a patent holder |
Address after: 230601 Anhui Province, Hefei City Industrial Park, the Peach Blossom Road No. 669 Patentee after: Anhui Jianghuai Automobile Group Limited by Share Ltd Address before: 230601 Anhui Province, Hefei City Industrial Park, the Peach Blossom Road No. 669 Patentee before: Anhui Jianghuai Automobile Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160330 Termination date: 20191124 |
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| CF01 | Termination of patent right due to non-payment of annual fee |