CN201886117U - Insulation detection circuit of electrically-propelled vehicle - Google Patents
Insulation detection circuit of electrically-propelled vehicle Download PDFInfo
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- CN201886117U CN201886117U CN2010205511710U CN201020551171U CN201886117U CN 201886117 U CN201886117 U CN 201886117U CN 2010205511710 U CN2010205511710 U CN 2010205511710U CN 201020551171 U CN201020551171 U CN 201020551171U CN 201886117 U CN201886117 U CN 201886117U
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Abstract
The utility model discloses an insulation detection circuit of an electrically-propelled vehicle. The insulation detection circuit comprises a parallel voltage-dividing circuit, a voltage follower, a sampling circuit and a microprocessor; the parallel voltage-dividing circuit comprises two branches, one branch comprises a first capacitor connected with a vehicle body, the other branch comprises a second resistance and a second capacitor connected with the negative electrode of a high tension battery pack, and the second resistance is connected with the second capacitor in series; the input end of the voltage follower is connected with the connecting point of the second resistance and the second capacitor, and is used for detecting the voltage sampling signal on the second capacitor; the sampling circuit is connected with the output end of the voltage follower, and is used for carrying out the delayed time processing operation to the signal output by the voltage follower; the output end of the microprocessor is used for transmitting a standard detection signal to the parallel voltage-dividing circuit through the first resistance; the analog-to-digital input end of the microprocessor is connected with the output end of the sampling circuit for receiving the output signal of the sampling circuit and calculating the vehicle insulation resistance of the high tension direct current battery pack; and the reference zero potential of the microprocessor is connected with the negative electrode of the high tension direct current battery pack. With simple structure and low cost, the insulation detection circuit is applicable to the real-time detection, and the detection result is not influenced by the voltage of the high tension direct current battery pack, therefore, the insulation detection circuit can be used for carrying out the detection to the insulation resistance of the electrically-propelled vehicle.
Description
Technical field:
The utility model relates to the detection of electric insulation, particularly a kind of insulation testing circuit that is used for electric motor car.
Background technology:
Electric vehicle all is equipped with the dc-battery group of high pressure as battery-operated motor cycle, electric automobile, PHEV, fuel-cell vehicle etc., and for the sake of security, the both positive and negative polarity bus and the car body of electric battery can not link together, and must guarantee that insulation is good.But vehicle-mounted working environment complexity, vibrations, the rapid variation of temperature and humidity, the corrosion of soda acid gas etc. all can cause the damage and the destruction of insulation, make decreasing insulating.When power supply positive and negative electrode lead-in wire constituted the leakage current loop by insulation course and car body, the current potential of car body can rise, thereby therefore the safety of the harm vehicle and the person, detect high-voltage electric system accurately and real-time the insulating property of car body are had great importance.The insulation status of electric motor car is by the insulation resistance decision to car body of the both positive and negative polarity bus of dc-battery group, and technical standard has clear and definite regulation, and this insulation resistance must be not less than 100 Europe/volts.
Present stage, the detection method to the electric motor car insulation resistance mainly contained:
1, balanced bridge method.
Utilize the principle of bridge diagram, two big resistance of equivalence of series connection between the positive and negative bus of dc-battery group, they and positive and negative bus over the ground insulation resistance have separately constituted a null-type bridge circuit, between ground and two resistance of connecting, connect reometer again, under the good situation of insulation, the electric current that flows through between two brachium pontis is zero like this, in case and insulation resistance descends, electric bridge is with regard to out of trim, and reometer just has electric current to flow through.
The shortcoming of this method is, the degree of accuracy of the bridge diagram that makes up required very high, and the method itself just reduced the insulating property of system, is not suitable for real-time detection.
2, accessory power supply is measured.
Utilize accumulator as external accessory power supply, form the closed-loop path with insulation resistance, being about to battery positive voltage links to each other with the negative pole of high voltage direct current battery group to be measured, battery terminal negative and car body are realized one point earth, and when system insulation to be measured was good, accumulator loop leakage current was zero, otherwise, accumulator produces leakage current by insulation resistance, reports to the police according to the size of this leakage current then, and turn-offs dc-battery group to be measured.
The shortcoming of this method is direct one point earth with accumulator, and this is unallowed in electric motor car.
3, the voltage dividing potential drop is measured.
Whole measurement loop is made up of ratio circuit and data acquisition process unit.The both positive and negative polarity bus of high-voltage DC power supply is connected with car body by two bigger resistance of resistance respectively, inserts a known measuring resistance R and a switching tube in addition between positive electrode bus and car body.The high speed output unit output pulse signal of data acquisition process unit by using single-chip microcomputer, the driving switch pipe is so that insert measuring resistance R; At switching tube conducting and off period, gather the input and output voltage that is directly proportional with power positive cathode bus voltage-to-ground of ratio circuit respectively, and be input to and calculate value less in the both positive and negative polarity insulation resistance among the CPU; When this measured value was lower than default secure threshold, the data acquisition process unit sent alerting signal.
Therefore the shortcoming of this method is that the voltage of measured value and high-voltage DC power supply is relevant, in a single day undergos mutation and will direct influence be arranged to measurement result at the advance voltage of mesohigh direct supply of vehicle.
The utility model content:
Technical problem to be solved in the utility model is the defective that overcomes existing electric motor car insulation testing circuit, a kind of insulation testing circuit of electric motor car is provided, it contains the in parallel bleeder circuit of high voltage direct current battery group to the car body insulation resistance with the input of standard detection signal, then according to judging insulation resistance size between high voltage direct current battery group and the car body by detected sampled signal in the bleeder circuit in parallel, thereby reach simple in structure, can detect the purpose that insulation resistance and measurement result are not subjected to the voltage influence of high voltage direct current battery group in real time.
The technical scheme in the invention for solving the technical problem is as follows:
A kind of insulation testing circuit of electric motor car, it comprises:
Bleeder circuit in parallel is made of two branches, and a branch comprises first electric capacity that connects car body, and another branch comprises second resistance and second electric capacity that is in series, and this second electric capacity is connected with high-tension battery group negative pole;
Voltage follower, input end are connected in the tie point of second resistance and second electric capacity, detect the voltage sampling signal on second electric capacity;
Sampling circuit is connected in the output terminal of voltage follower, and the output signal of voltage follower is carried out delay process;
Microprocessor, output terminal passes through first resistance to bleeder circuit transmission standard detection signal in parallel, the A/D input end connects the output terminal of sampling circuit, receive the output signal of sampling circuit and calculate the insulation resistance of high voltage direct current battery group to car body according to this, the reference zero potential of this microprocessor is connected with the negative pole of high voltage direct current battery group.
The voltage follower of the insulation testing circuit of electric motor car described in the utility model is that enlargement factor is 1: 1 a operational amplifier; Described microprocessor sends alerting signal in the amplitude of voltage sampling signal less than 50% o'clock of standard detection signal, and the standard detection signal of its output is the rectangle square wave, and can calculate the numerical value of described insulation resistance under different sampled signals.
Compare with existing electric motor car insulation testing circuit, the utility model at first needn't make up accurate bridge diagram, has also saved elements such as switching tube, thereby has had advantage simple in structure, with low cost; Secondly, because in bleeder circuit in parallel, the voltage sampling signal that voltage follower detects on second electric capacity is only relevant with the internal resistance of high voltage direct current battery group, and this internal resistance is very little, so measurement of the present utility model is not subjected to the influence of high voltage direct current battery group voltage, do not exist predetermined threshold value constantly to change the problem of making corresponding correction yet,, can not produce any influence yet measurement result even therefore this voltage has sudden change in vehicle ' with supply voltage; Once more, the utility model contains sample circuit, can detect the voltage sampling signal amplitude under different insulative resistance exactly, and calculates real-time insulating resistance value by microprocessor, thereby has improved the precision of whole testing circuit.
In a word, that the insulation testing circuit of electric motor car described in the utility model has is simple in structure, with low cost, be suitable in real time detect, advantage that the result is not subjected to the voltage influence of high voltage direct current battery group, can be used in the detection of the insulation resistance of all electric vehicles of comprising PHEV and other battery power supply systems.
Description of drawings:
Fig. 1 is a circuit structure sketch of the present utility model.
Embodiment:
Now with accompanying drawing the utility model is further specified in conjunction with specific embodiments.
See also Fig. 1 structure diagram of the present utility model, the insulation testing circuit of diagram electric motor car is used to detect the insulation resistance of all electric vehicles and other battery power supply systems.Be provided with high voltage direct current battery group in the described electric motor car, this high voltage direct current battery group is connecting load, exists insulation resistance R naturally between its positive and negative electrode bus and the electric motor car car body.In order to detect the insulation status between high voltage direct current battery group and the car body, between the negative pole of high voltage direct current battery group and car body, be connected with the insulation testing circuit, the negative pole bus of high voltage direct current battery group and the reference zero potential of described insulation testing circuit link together, and this insulation testing circuit comprises bleeder circuit in parallel, voltage follower, sampling circuit and microprocessor.
Described bleeder circuit in parallel is made of two parallel branchs: a branch comprises first capacitor C 1, this first capacitor C 1 is connected with car body, internal resistance by insulation resistance R, high voltage direct current battery group is connected with the reference zero potential of insulation testing circuit again, and the internal resistance of high voltage direct current battery group is very little, so this branch's reality is in series by first capacitor C 1 and insulation resistance R; Another branch comprises second resistance R 2 and second capacitor C 2 of mutual series connection, and this second capacitor C 2 is connected with high-tension battery group negative pole, and promptly the reference zero potential with the insulation testing circuit is connected, and second resistance R 2 is connected with first capacitor C 1.In bleeder circuit in parallel as above, the variation of insulation resistance R will influence the voltage parameter of each node, press the size of parameter just can judge whether high voltage direct current battery group is good to the insulation status of car body as long as have articulation point to power on the detection bleeder circuit in parallel conversely speaking.
Described voltage follower is that an enlargement factor is 1: 1 a operational amplifier, play the effect of impedance matching, its input end is connected on the tie point of second resistance R 2 of connecting and second capacitor C 2, by the voltage sampling signal that detects on this node on second capacitor C 2.
Described sampling circuit is connected in the output terminal of voltage follower, and it mainly carries out delay process to the output signal of voltage follower.
Described microprocessor can take place and the transmission standard detection signal, this standard detection signal is the rectangle square wave with certain dutycycle, the output terminal of this microprocessor is connected to by first resistance R 1 on the tie point of first capacitor C 1 and second resistance R 2, thus the standard detection signal that is used to detect to bleeder circuit transmission in parallel; The A/D input end of this microprocessor connects the output terminal of sampling circuit, also calculate the insulation resistance R of high voltage direct current battery group to car body according to this with the output signal that receives sampling circuit, promptly described microprocessor can calculate the numerical value of described insulation resistance under different sampled signals; In less than the standard detection signal 50% o'clock of the amplitude of voltage sampling signal, microprocessor can send alerting signal; The reference zero potential of this microprocessor is connected with the negative pole of high voltage direct current battery group.
When the insulation testing circuit of electric motor car described in the utility model is worked, the output port output rectangle square-wave signal of microprocessor, this square-wave signal puts on the bleeder circuit of being made up of first capacitor C 1, insulation resistance R and second resistance R 2, second capacitor C 2 in parallel via first resistance R 1.If the insulation status between high voltage direct current battery group and the car body is bad, then can cause reducing of insulation resistance R, thereby the equivalent resistance of the duplexure of being made up of first capacitor C 1 and insulation resistance R is also correspondingly reduced, therefore, voltage sampling signal amplitude on the tie point by second resistance R 2 and second capacitor C 2 on detected second capacitor C 2 will diminish thereupon, when the amplitude of this voltage sampling signal less than the standard detection signal of microprocessor input 50% the time, just illustrate that the insulation status between high voltage direct current battery group and the car body is abominable, so microprocessor sends warning.This microprocessor can be according to the size of the amplitude accurate Calculation insulation resistance R of voltage sampling signal, and therefore the accuracy of detection of the insulation testing circuit of electric motor car described in the utility model is higher.
Above-mentioned only is an embodiment of the present utility model; and be not used in the utility model scope required for protection that limits; every all equivalence of doing according to technical solutions of the utility model changes or equivalence is replaced, and all should be included within the scope that the utility model claim contained.
Claims (3)
1. the insulation testing circuit of an electric motor car, it is characterized in that: described insulation testing circuit comprises:
Bleeder circuit in parallel is made of two branches, and a branch comprises first electric capacity that connects car body, and another branch comprises second resistance and second electric capacity that is in series, and this second electric capacity is connected with high-tension battery group negative pole;
Voltage follower, input end are connected in the tie point of second resistance and second electric capacity, detect the voltage sampling signal on second electric capacity;
Sampling circuit is connected in the output terminal of voltage follower, and the output signal of voltage follower is carried out delay process;
Microprocessor, output terminal passes through first resistance to bleeder circuit transmission standard detection signal in parallel, the A/D input end connects the output terminal of sampling circuit, receive the output signal of sampling circuit and calculate the insulation resistance of high voltage direct current battery group to car body according to this, the reference zero potential of this microprocessor is connected with the negative pole of high voltage direct current battery group.
2. the insulation testing circuit of electric motor car according to claim 1, it is characterized in that: described voltage follower is that enlargement factor is 1: 1 a operational amplifier.
3. the insulation testing circuit of electric motor car according to claim 1 is characterized in that: the standard detection signal of described microprocessor output is the rectangle square wave.
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| CN2010205511710U CN201886117U (en) | 2010-09-29 | 2010-09-29 | Insulation detection circuit of electrically-propelled vehicle |
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| CN2010205511710U CN201886117U (en) | 2010-09-29 | 2010-09-29 | Insulation detection circuit of electrically-propelled vehicle |
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| CN102508038A (en) * | 2011-10-18 | 2012-06-20 | 上海恒动汽车电池有限公司 | Insulating detection system and method of power battery for electric automobile |
| CN102798808A (en) * | 2012-08-10 | 2012-11-28 | 宁德新能源科技有限公司 | Insulation detection system |
| CN102798807A (en) * | 2012-08-10 | 2012-11-28 | 宁德新能源科技有限公司 | Insulation detection system capable of performing redundant allocation |
| CN103076497A (en) * | 2012-12-18 | 2013-05-01 | 江苏常隆客车有限公司 | Insulation detection method based on low frequency impulse signal injection |
| CN103499744A (en) * | 2013-10-12 | 2014-01-08 | 郑州日产汽车有限公司 | Electric automobile insulation resistance on-line monitoring method based on frequency response |
| CN103675628A (en) * | 2013-12-26 | 2014-03-26 | 东风商用车有限公司 | Electric vehicle high-voltage insulation monitoring and protecting system and application method thereof |
| CN103837806A (en) * | 2012-11-21 | 2014-06-04 | 赵元雷 | Insulation degree monitoring alarm device of electric automobile high voltage power supply system |
| CN104380123A (en) * | 2012-06-18 | 2015-02-25 | 日立汽车***株式会社 | Leak detection device |
| CN104635057A (en) * | 2015-02-11 | 2015-05-20 | 合肥工业大学 | Electric automobile insulation detection system and control method based on adaptive voltage compensation and low-frequency injection |
| CN104833855A (en) * | 2012-08-13 | 2015-08-12 | 伍俊 | Alarm instrument for on-line monitoring of insulation resistance of high-voltage equipment |
| CN104950175A (en) * | 2014-03-31 | 2015-09-30 | 罗伯特·博世有限公司 | Method for detecting insulation device |
| CN106841962A (en) * | 2017-02-24 | 2017-06-13 | 北京新能源汽车股份有限公司 | A kind of high voltage component insulation detecting circuit and insulation detecting method |
| CN107861010A (en) * | 2017-09-20 | 2018-03-30 | 深圳市超思维电子股份有限公司 | A kind of detection line falls line detection circuit and method |
| CN108333492A (en) * | 2018-02-01 | 2018-07-27 | 宁德时代新能源科技股份有限公司 | Insulation detection circuit and method and battery management system |
| CN109690330A (en) * | 2016-09-14 | 2019-04-26 | 江森自控科技公司 | System and method for measuring isolation resistance |
| CN109720235A (en) * | 2018-12-29 | 2019-05-07 | 蜂巢能源科技有限公司 | Insulation Inspection System and electric car based on full-bridge insulation detecting circuit |
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| CN110412435A (en) * | 2018-04-27 | 2019-11-05 | 大银微***股份有限公司 | Motor insulation inspection method |
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2010
- 2010-09-29 CN CN2010205511710U patent/CN201886117U/en not_active Expired - Lifetime
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| CN102508038A (en) * | 2011-10-18 | 2012-06-20 | 上海恒动汽车电池有限公司 | Insulating detection system and method of power battery for electric automobile |
| CN104380123B (en) * | 2012-06-18 | 2016-12-14 | 日立汽车***株式会社 | Earth detector |
| CN104380123A (en) * | 2012-06-18 | 2015-02-25 | 日立汽车***株式会社 | Leak detection device |
| CN102798808A (en) * | 2012-08-10 | 2012-11-28 | 宁德新能源科技有限公司 | Insulation detection system |
| CN102798807A (en) * | 2012-08-10 | 2012-11-28 | 宁德新能源科技有限公司 | Insulation detection system capable of performing redundant allocation |
| CN104833855B (en) * | 2012-08-13 | 2017-08-11 | 伍俊 | To the alarm of the insulaion resistance on-line monitoring of high-tension apparatus |
| CN104833855A (en) * | 2012-08-13 | 2015-08-12 | 伍俊 | Alarm instrument for on-line monitoring of insulation resistance of high-voltage equipment |
| CN103837806A (en) * | 2012-11-21 | 2014-06-04 | 赵元雷 | Insulation degree monitoring alarm device of electric automobile high voltage power supply system |
| CN103076497A (en) * | 2012-12-18 | 2013-05-01 | 江苏常隆客车有限公司 | Insulation detection method based on low frequency impulse signal injection |
| CN103499744A (en) * | 2013-10-12 | 2014-01-08 | 郑州日产汽车有限公司 | Electric automobile insulation resistance on-line monitoring method based on frequency response |
| CN103675628B (en) * | 2013-12-26 | 2017-01-04 | 东风商用车有限公司 | A kind of electric vehicle high-voltage insulation monitoring and protecting system and using method thereof |
| CN103675628A (en) * | 2013-12-26 | 2014-03-26 | 东风商用车有限公司 | Electric vehicle high-voltage insulation monitoring and protecting system and application method thereof |
| CN104950175A (en) * | 2014-03-31 | 2015-09-30 | 罗伯特·博世有限公司 | Method for detecting insulation device |
| CN104635057A (en) * | 2015-02-11 | 2015-05-20 | 合肥工业大学 | Electric automobile insulation detection system and control method based on adaptive voltage compensation and low-frequency injection |
| CN109690330A (en) * | 2016-09-14 | 2019-04-26 | 江森自控科技公司 | System and method for measuring isolation resistance |
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| CN110221126B (en) * | 2018-03-01 | 2021-07-16 | 联合汽车电子有限公司 | Insulation impedance detection system and detection method |
| CN110412435A (en) * | 2018-04-27 | 2019-11-05 | 大银微***股份有限公司 | Motor insulation inspection method |
| CN110967651B (en) * | 2018-09-30 | 2021-11-05 | 广东威灵汽车部件有限公司 | Electric automobile and short circuit to ground detection device thereof |
| CN110967651A (en) * | 2018-09-30 | 2020-04-07 | 广东威灵汽车部件有限公司 | Electric automobile and short circuit to ground detection device thereof |
| WO2020135703A1 (en) * | 2018-12-29 | 2020-07-02 | 蜂巢能源科技有限公司 | Insulation detection system based on full-bridge insulation detection circuit and electric automobile |
| CN109720235A (en) * | 2018-12-29 | 2019-05-07 | 蜂巢能源科技有限公司 | Insulation Inspection System and electric car based on full-bridge insulation detecting circuit |
| CN109720235B (en) * | 2018-12-29 | 2020-06-30 | 蜂巢能源科技有限公司 | Insulation detection system based on full-bridge insulation detection circuit and electric automobile |
| CN115166432A (en) * | 2022-06-28 | 2022-10-11 | 肇庆小鹏汽车有限公司 | Automobile high-voltage power supply loop insulation detection method, circuit and system and automobile |
| CN115166432B (en) * | 2022-06-28 | 2024-03-08 | 肇庆小鹏汽车有限公司 | Method, circuit and system for detecting insulation of high-voltage power supply loop of automobile and automobile |
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Granted publication date: 20110629 |