CN203673028U - High-voltage insulation monitoring and protecting system for electric vehicle - Google Patents
High-voltage insulation monitoring and protecting system for electric vehicle Download PDFInfo
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Abstract
A high-voltage insulation monitoring and protecting system of an electric vehicle comprises a high-voltage monitoring circuit, a controller and a power module, wherein the high-voltage monitoring circuit comprises a waveform generator, a capacitor, a resistor and an insulation resistor positioned between a negative electrode of a high-voltage battery and a vehicle body ground; when the device is used, the waveform generator continuously generates waveform signals, the AC/DC converter immediately monitors the voltages at two ends of the resistor to reflect the change of the insulation resistor, and the comparator, the signal processing module and the logic judgment processing module sequentially process the monitoring result to obtain the immediate condition of the insulation resistor so as to carry out insulation control. The design has the advantages of simple monitoring program, insulation monitoring reminding function, strong adjustability, high accuracy, strong safety and wide application range.
Description
Technical field
The utility model relates to a kind of vehicle insulating monitoring protection system; relate in particular to a kind of electric vehicle High-Voltage Insulation monitoring and protecting system; belong to electric automobile high-voltage safety technique protection field, be specifically applicable to improve accuracy, the security of insulation protection, and expand its range of application.
Background technology
Along with the fast development of new-energy automobile, electric automobile more and more comes into one's own.The critical piece of electric automobile comprises electrokinetic cell, motor, electric powered steering, electric air-conditioning, electric air compressor and high-tension cable etc., the voltage of electrokinetic cell is generally all more than 300V, once Insulation Problems appears in these parts, will directly jeopardize driver and crew's life security.Therefore on electric vehicle, be equipped with High-Voltage Insulation monitoring and protecting device, detect real-time and accurately high-voltage electric system to vehicle chassis insulating property, to ensureing that passenger safety, electrical equipment are normally worked and vehicle safety operation is significant.In view of this, on electric vehicle, start to be equipped with High-Voltage Insulation monitoring system at present, if Chinese patent Granted publication number is CN202083767U, Granted publication day is that the utility model patent on Dec 21st, 2011 discloses a kind of high-voltage insulation monitoring device, this device comprises: high-voltage measuring circuit, be connected with controller, for gathering in real time or regularly the magnitude of voltage of some monitoring points of supplying cell, and the voltage signal collecting be sent to controller; Insulation detecting circuit, is connected with controller, for the magnitude of voltage on Real-time Collection supplying cell positive polarity or ground, and the voltage signal collecting is sent to controller; Controller, monitors the High Abnormal Pressure situation of feed circuit for the voltage signal sending according to described high-voltage measuring circuit, and the voltage signal detection supplying cell positive polarity sending according to insulation detecting circuit or the Abnormal Insulation phenomenon on ground.Although this utility model can be protected by controller the life security of human pilot to carry out relevant action according to the multiple magnitudes of voltage that monitor, voltage signal, it still has following defect:
First, monitoring facilities is loaded down with trivial details, degree of accuracy is lower: in this design, the high-voltage measuring circuit, the insulating monitoring circuit that are connected with controller all comprise multiple data acquisition units, when use, need to carry out multiple data acquisitions to multiple points, and to after repeatedly processing, just pass to controller to gathered each data, finally be judged the High-Voltage Insulation situation of monitoring point by controller.Not only monitoring target is too many, and the program of flowing through, instrument are also too many, and spended time is very long, there is very large potential safety hazard, easily in the process of processing, will go wrong, after all, as long as Insulation Problems appears in the magnitude of voltage of a monitoring point, just will certainly cause potential safety hazard; In addition, adopt multiple data acquisition unit image data, and each data are carried out to repeatedly voltage processing, not only complex steps, and can cause distorted signals, thus reduce the degree of accuracy of data, the judgement that final impact is controlled.
Secondly, lack insulating monitoring prompting function, security is lower: although this design can be by the controller judgement of insulate, and realizes the control of insulating, there is certain security.But it lacks essential insulating monitoring prompting function, not only cause in the time that insulation fault appears in vehicle, just can controlling, easily accidents caused, security is lower, and, even vehicle is carried out to vehicle control, but also can be due to the prompting of not insulating, and cannot get the guilty culprit of vehicle clear, be unfavorable for fixing a breakdown.
Again, tunability is weak, range of application is narrower: the power supply in this design only can provide this kind of voltage of 3.3V to use to controller, high-voltage measuring circuit, insulation detecting circuit, do not possess voltage transformation function, also just can not be applicable to other type insulation monitoring system, as needing the system of multiple voltage, range of application is narrower.
Summary of the invention
The purpose of this utility model is to overcome that the monitoring facilities existing in prior art is loaded down with trivial details, degree of accuracy is lower, lack insulating monitoring prompting function, narrower defect and the problem of range of application, the electric vehicle High-Voltage Insulation monitoring and protecting system that provide that a kind of monitoring facilities is simple, degree of accuracy is higher, possess insulating monitoring prompting function, range of application is wider.
For realizing above object, technical solution of the present utility model is: a kind of electric vehicle High-Voltage Insulation monitoring and protecting system, comprise high pressure observation circuit, controller and power module, the signal output part of described high pressure observation circuit is connected with the signal input part of controller, and is connected with power module on controller;
Described high pressure observation circuit comprises waveform generator, electric capacity, resistance and insulation resistance; Described controller comprises AC/DC converter, comparer, signal processing module and logic judging treatmenting module; Described power module is the adjustable power supply of output voltage;
The input end of described power module is connected with car load power supply, and the output terminal of power module is connected with waveform generator, AC/DC converter, comparer, signal processing module, logic judging treatmenting module respectively;
The signal output part of described waveform generator is connected with one end of electric capacity, resistance respectively, the other end of electric capacity is connected with one end of high-tension battery negative pole, insulation resistance respectively, the other end of insulation resistance is connected with vehicle body ground, and the other end of resistance is connected with vehicle body ground;
The two ends of described resistance are connected with two input ends of AC/DC converter, the output terminal of AC/DC converter is connected with the input end of comparer, two output terminals of comparer are connected with two input ends of signal processing module, two output terminals of signal processing module are connected with two input ends of logic judging treatmenting module, and the output terminal of logic judging treatmenting module is connected with warning device, high-tension battery manager respectively.
Described warning device comprises signal lamp, the alarm of instrument and upper connection thereof.
The master chip of described power module is LM2596 – ADJ regulator, and auxiliary chip is LM7805, MAX1847.
Described AC/DC converter is chip used is AD736.
Described comparer is chip used is LM258.
Described waveform generator is triangular signal generator based or sine wave signal generator.
A using method for above-mentioned electric vehicle High-Voltage Insulation monitoring and protecting system, described using method comprises the following steps:
First by power module, car load power supply is converted to different output voltages to meet waveform generator, AC/DC converter, comparer, signal processing module, the needs of logic judging treatmenting module, the waveform generator after electric ceaselessly produces ripple signal to pass through respectively electric capacity, resistance, when high-tension battery negative pole, when insulation resistance between vehicle body ground changes, the voltage at resistance two ends can change thereupon, simultaneously, the voltage at AC/DC converter meeting instantaneous acquiring resistance two ends, and be converted into real effective to pass to comparer, again by relatively real effective of comparer, set the size of safe threshold values, and comparative result is sent to signal processing module, then process to be met comparative result after the processing of logic judging treatmenting module demand by signal processing module compared result, and comparative result after processing is passed to logic judging treatmenting module, carry out logic judgement by logic judging treatmenting module to processing rear comparative result again, then judged result is sent to warning device with the form of PWM ripple, high-tension battery manager is to carry out corresponding alarm operation, high-tension battery bookkeeping.
Described warning device comprises signal lamp, the alarm of instrument and upper connection thereof;
Described alarm operation refers to: signal lamp is according to the PWM ripple of received different duty, show respectively red, yellow, green to remind insulation resistance in dangerous situation, warning situation, security situation, and when insulation resistance is during in warning situation or dangerous situation, alarm equipment alarm.
Described high-tension battery bookkeeping refers to: high-tension battery manager first according to the PWM ripple of received different duty to determine the situation of change of the insulation resistance between high-tension battery negative pole, vehicle body ground, then according to the action of the relevant topworks of the situation of change control of insulation resistance.
Described ripple signal is triangular wave or sine wave signal.
Compared with prior art, the beneficial effects of the utility model are:
1, in a kind of electric vehicle High-Voltage Insulation of the utility model monitoring and protecting system, produce signal to pass to electric capacity, resistance by waveform generator; by AC/DC converter, the voltage at resistance two ends is carried out to at-once monitor again; resistance both end voltage is directly related with insulation resistance situation of change; the voltage of AC/DC converter monitoring is successively after comparer, signal processing module, the judgement of logic judging treatmenting module are processed, and form that can PWM ripple feeds back to high-tension battery manager, warning device with the control of insulating by insulation resistance situation.Whole system, not only amount of parts is less, layout is clear, and monitoring target is single, with strong points, has greatly simplified monitoring facilities, in addition, only need process single echo signal, is conducive to improve the degree of accuracy of signal.Therefore, the utility model not only monitoring facilities is simple, and degree of accuracy is higher.
2, in a kind of electric vehicle High-Voltage Insulation of the utility model monitoring and protecting system, be provided with warning device to realize insulating monitoring prompting function; this warning device can carry out effectively reporting to the police with prompting driver in the time there is insulation fault; not only security is higher; and with clearly defined objective, be convenient to fix a breakdown.Especially comprise instrument, signal lamp, alarm when warning device, and can carry out showing without the signal of color according to the PWM ripple of received different duty time, its better effects if.Therefore, the utility model not only possesses insulating monitoring prompting function, and security is stronger.
3, the power module in a kind of electric vehicle High-Voltage Insulation of the utility model monitoring and protecting system is the adjustable power supply of output voltage; adjustability is stronger; can convert to meet to output voltage different service objects' voltage requirements; range of application is wider; applicable to various type insulation monitoring system; the master chip of especially working as power module is LM2596 – ADJ regulator, when auxiliary chip is LM7805, MAX1847, and its better effects if.Therefore, the utility model not only tunability is stronger, and range of application is wider.
4, the chip used AD73 that is preferably of AC/DC converter in a kind of electric vehicle High-Voltage Insulation of the utility model monitoring and protecting system; this kind of chip can be measured the effective value of various voltage waveforms more accurately; and needn't consider parameter and the distortion of tested waveform; degree of accuracy and sensitivity are all higher, are conducive to improve the design's result of use.Therefore, degree of accuracy of the present utility model, sensitivity are all higher.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model.
In figure: power module 1, controller 2, AC/DC converter 21, comparer 22, signal processing module 23, logic judging treatmenting module 24, high pressure observation circuit 3, waveform generator 31, electric capacity 32, resistance 33, insulation resistance 34, high-tension battery negative pole 35, vehicle body ground 36, warning device 4, instrument 41, signal lamp 42, alarm 43, high-tension battery manager 5, car load power supply 6.
Embodiment
Below in conjunction with brief description of the drawings and embodiment, the utility model is described in further detail.
Referring to Fig. 1, a kind of electric vehicle High-Voltage Insulation monitoring and protecting system, comprise high pressure observation circuit 3, controller 2 and power module 1, the signal output part of described high pressure observation circuit 3 is connected with the signal input part of controller 2, and is connected with power module 1 on controller 2;
Described high pressure observation circuit 3 comprises waveform generator 31, electric capacity 32, resistance 33 and insulation resistance 34; Described controller 2 comprises AC/DC converter 21, comparer 22, signal processing module 23 and logic judging treatmenting module 24; Described power module 1 is the adjustable power supply of output voltage;
The input end of described power module 1 is connected with car load power supply 6, and the output terminal of power module 1 is connected with waveform generator 31, AC/DC converter 21, comparer 22, signal processing module 23, logic judging treatmenting module 24 respectively;
The signal output part of described waveform generator 31 is connected with one end of electric capacity 32, resistance 33 respectively, the other end of electric capacity 32 is connected with one end of high-tension battery negative pole 35, insulation resistance 34 respectively, the other end of insulation resistance 34 is connected with vehicle body ground 36, and the other end of resistance 33 is connected with vehicle body ground 36;
The two ends of described resistance 33 are connected with two input ends of AC/DC converter 21, the output terminal of AC/DC converter 21 is connected with the input end of comparer 22, two output terminals of comparer 22 are connected with two input ends of signal processing module 23, two output terminals of signal processing module 23 are connected with two input ends of logic judging treatmenting module 24, and the output terminal of logic judging treatmenting module 24 is connected with warning device 4, high-tension battery manager 55 respectively.
Described warning device 4 comprises signal lamp 42, the alarm 43 of instrument 41 and upper connection thereof.
The master chip of described power module 1 is LM2596 – ADJ regulator, and auxiliary chip is LM7805, MAX1847.
Described AC/DC converter 21 is chip used is AD736.
Described comparer 22 is chip used is LM258.
Described waveform generator 31 is triangular signal generator based or sine wave signal generator.
A using method for above-mentioned electric vehicle High-Voltage Insulation monitoring and protecting system, described using method comprises the following steps:
First by power module 1, car load power supply 6 is converted to different output voltages to meet waveform generator 31, AC/DC converter 21, comparer 22, signal processing module 23, the needs of logic judging treatmenting module 24, the waveform generator 31 after electric ceaselessly produces ripple signal to pass through respectively electric capacity 32, resistance 33, when high-tension battery negative pole 35, when insulation resistance 34 between vehicle body ground 36 changes, the voltage at resistance 33 two ends can change thereupon, simultaneously, the voltage at AC/DC converter 21 meeting instantaneous acquiring resistance 33 two ends, and be converted into real effective to pass to comparer 22, again by relatively real effective of comparer 22, set the size of safe threshold values, and comparative result is sent to signal processing module 23, then process to be met comparative result after the processing of logic judging treatmenting module 24 demands by signal processing module 23 compared result, and comparative result after processing is passed to logic judging treatmenting module 24, carry out logic judgement by logic judging treatmenting module 24 to processing rear comparative result again, then judged result is sent to warning device 4 with the form of PWM ripple, high-tension battery manager 5 is to carry out corresponding alarm operation, high-tension battery bookkeeping.
Described warning device 4 comprises signal lamp 42, the alarm 43 of instrument 41 and upper connection thereof;
Described alarm operation refers to: signal lamp 42 is according to the PWM ripple of received different duty, show respectively red, yellow, green to remind insulation resistance 34 in dangerous situation, warning situation, security situation, and when insulation resistance 34 is during in warning situation or dangerous situation, alarm 43 is reported to the police.
Described high-tension battery bookkeeping refers to: high-tension battery manager 5 first according to the PWM ripple of received different duty to determine the situation of change of the insulation resistance 34 between high-tension battery negative pole 35, vehicle body ground 36, then according to the action of the relevant topworks of the situation of change control of insulation resistance 34.
Described ripple signal is triangular wave or sine wave signal.
Principle of the present utility model is described as follows:
1, whole monitoring process:
Waveform generator sends to electric capacity and resistance for generation of signal, the Main Function of electric capacity is the logical AC signal of stopping direct current signal, when high-tension battery negative pole, when insulation resistance between vehicle body ground changes, the voltage at resistance two ends must change, simultaneously, AC/DC converter can collect this magnitude of voltage at resistance two ends constantly, and be converted into real effective and pass to comparer, the comparer real effective that relatively AC/DC converter transmits and the size of setting safe threshold values, and result is sent to signal processing module, the effect of signal processing module be that the comparative result that comparer is sent is processed, make it meet the demand of logic judging treatmenting module, and pass to logic judging treatmenting module, logic judging treatmenting module carries out sending to high-tension battery manager and warning device with PWM waveshape after logic judgement to it again, warning device comprises the signal lamp of instrument and upper connection thereof, alarm.This signal lamp can be according to the PWM ripple of received different duty, show that respectively it is in dangerous situation, warning situation, security situation that red, yellow, green is pointed out driver's insulation resistance, when insulation resistance is during in warning situation or dangerous situation, alarm equipment alarm, prompting driver parking checking.High-tension battery manager also can be understood according to the PWM ripple of received different duty the situation of change of insulation resistance between high-tension battery negative pole, vehicle body ground, carries out safeguard protection.
2, power module:
It is LM2596 – ADJ regulator that power module adopts master chip, coordinate LM7805, MAX1847 chip, car load 12V/24V power supply can be converted to random devices required voltage, as offer waveform generator, AC/DC converter, comparer, signal processing module, the needed input voltage of logic judging treatmenting module, therefore its range of application is wider.
Embodiment 1:
A kind of electric vehicle High-Voltage Insulation monitoring and protecting system, comprise high pressure observation circuit 3, controller 2 and power module 1, described high pressure observation circuit 3 comprises that waveform generator 31(is as triangular signal generator based or sine wave signal generator), electric capacity 32, resistance 33 and insulation resistance 34, controller 2 comprises AC/DC converter 21, comparer 22, signal processing module 23 and logic judging treatmenting module 24, and power module 1 is the adjustable power supply of output voltage;
The input end of described power module 1 is connected with car load power supply 6, and the output terminal of power module 1 is connected with waveform generator 31, AC/DC converter 21, comparer 22, signal processing module 23, logic judging treatmenting module 24 respectively;
The signal output part of described waveform generator 31 is connected with one end of electric capacity 32, resistance 33 respectively, the other end of electric capacity 32 is connected with one end of high-tension battery negative pole 35, insulation resistance 34 respectively, the other end of insulation resistance 34 is connected with vehicle body ground 36, and the other end of resistance 33 is connected with vehicle body ground 36;
The two ends of described resistance 33 are connected with two input ends of AC/DC converter 21, the output terminal of AC/DC converter 21 is connected with the input end of comparer 22, two output terminals of comparer 22 are connected with two input ends of signal processing module 23, two output terminals of signal processing module 23 are connected with two input ends of logic judging treatmenting module 24, the output terminal of logic judging treatmenting module 24 respectively with warning device 4(comprise instrument 41 and on the signal lamp 42, the alarm 43 that are connected), high-tension battery manager 55 is connected.
A using method for above-mentioned electric vehicle High-Voltage Insulation monitoring and protecting system, described using method comprises the following steps:
First by power module 1, car load power supply 6 is converted to different output voltages to meet waveform generator 31, AC/DC converter 21, comparer 22, signal processing module 23, the needed voltage of logic judging treatmenting module 24, the waveform generator 31 after electric ceaselessly produces ripple signal (triangular wave or sine wave) to pass through respectively electric capacity 32, resistance 33, when high-tension battery negative pole 35, when insulation resistance 34 between vehicle body ground 36 changes, the voltage at resistance 33 two ends will inevitably change thereupon, simultaneously, be carried in the voltage that the AC/DC converter 21 at resistance 33 two ends will instantaneous acquiring resistance 33 two ends, and be converted into real effective to pass to comparer 22, again by relatively real effective of comparer 22, set the size of safe threshold values, and comparative result is sent to signal processing module 23, then processed to be met " comparative result after processing " of logic judging treatmenting module 24 demands by signal processing module 23 compared result, and " comparative result after processing " passed to logic judging treatmenting module 24, carry out logic judgement by logic judging treatmenting module 24 to processing rear comparative result again, then judged result is sent to warning device 4 with the form of PWM ripple, high-tension battery manager 5 is to carry out corresponding alarm operation, high-tension battery bookkeeping,
Described alarm operation refers to: signal lamp 42 can be according to the PWM ripple of received different duty, demonstration redness respectively, yellow, green point out driver's insulation resistance 34 in dangerous situation, warning situation, security situation, and when insulation resistance 34 is during in warning situation or dangerous situation, alarm 43 is reported to the police, prompting driver parking checking;
Described high-tension battery bookkeeping refers to: high-tension battery manager 5 first according to the PWM ripple of received different duty to determine the situation of change of the insulation resistance 34 between high-tension battery negative pole 35, vehicle body ground 36, then according to the action of the relevant topworks of the situation of change control of insulation resistance 34.
Claims (6)
1. an electric vehicle High-Voltage Insulation monitoring and protecting system; comprise high pressure observation circuit (3), controller (2) and power module (1); the signal output part of described high pressure observation circuit (3) is connected with the signal input part of controller (2); and on controller (2), be connected with power module (1), it is characterized in that:
Described high pressure observation circuit (3) comprises waveform generator (31), electric capacity (32), resistance (33) and insulation resistance (34); Described controller (2) comprises AC/DC converter (21), comparer (22), signal processing module (23) and logic judging treatmenting module (24); Described power module (1) is the adjustable power supply of output voltage;
The input end of described power module (1) is connected with car load power supply (6), and the output terminal of power module (1) is connected with waveform generator (31), AC/DC converter (21), comparer (22), signal processing module (23), logic judging treatmenting module (24) respectively;
The signal output part of described waveform generator (31) is connected with one end of electric capacity (32), resistance (33) respectively, the other end of electric capacity (32) is connected with one end of high-tension battery negative pole (35), insulation resistance (34) respectively, the other end of insulation resistance (34) is connected with vehicle body ground (36), and the other end of resistance (33) is connected with vehicle body ground (36);
The two ends of described resistance (33) are connected with two input ends of AC/DC converter (21), the output terminal of AC/DC converter (21) is connected with the input end of comparer (22), two output terminals of comparer (22) are connected with two input ends of signal processing module (23), two output terminals of signal processing module (23) are connected with two input ends of logic judging treatmenting module (24), and the output terminal of logic judging treatmenting module (24) is connected with warning device (4), high-tension battery manager (5) respectively.
2. a kind of electric vehicle High-Voltage Insulation monitoring and protecting system according to claim 1, is characterized in that: described warning device (4) comprises signal lamp (42), the alarm (43) of instrument (41) and upper connection thereof.
3. a kind of electric vehicle High-Voltage Insulation monitoring and protecting system according to claim 1 and 2, is characterized in that: the master chip of described power module (1) is LM2596 – ADJ regulator, and auxiliary chip is LM7805, MAX1847.
4. a kind of electric vehicle High-Voltage Insulation monitoring and protecting system according to claim 1 and 2, is characterized in that: described AC/DC converter (21) is chip used is AD736.
5. a kind of electric vehicle High-Voltage Insulation monitoring and protecting system according to claim 1 and 2, is characterized in that: described comparer (22) is chip used is LM258.
6. a kind of electric vehicle High-Voltage Insulation monitoring and protecting system according to claim 1 and 2, is characterized in that: described waveform generator (31) is triangular signal generator based or sine wave signal generator.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320865923.4U CN203673028U (en) | 2013-12-26 | 2013-12-26 | High-voltage insulation monitoring and protecting system for electric vehicle |
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| CN201320865923.4U CN203673028U (en) | 2013-12-26 | 2013-12-26 | High-voltage insulation monitoring and protecting system for electric vehicle |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103675628A (en) * | 2013-12-26 | 2014-03-26 | 东风商用车有限公司 | High-voltage insulation monitoring and protecting system for electric vehicle and using method thereof |
| CN108152685A (en) * | 2017-11-29 | 2018-06-12 | 国网河南省电力公司偃师市供电公司 | A kind of electric power system low frequency insulation detection device and method |
| CN109239537A (en) * | 2017-07-10 | 2019-01-18 | 比亚迪股份有限公司 | The Insulation Inspection System of train and train |
| CN109239538A (en) * | 2017-07-10 | 2019-01-18 | 比亚迪股份有限公司 | The Insulation Inspection System of train and train |
| CN109239562A (en) * | 2017-07-10 | 2019-01-18 | 比亚迪股份有限公司 | The Insulation Inspection System of train and train |
| CN113039448A (en) * | 2018-09-13 | 2021-06-25 | 美达系统有限公司 | System for checking electrical insulation in a converter of an electric vehicle |
| CN114167191A (en) * | 2021-12-16 | 2022-03-11 | 深圳市道通科技股份有限公司 | Automobile power converter detection method and system and computer equipment |
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2013
- 2013-12-26 CN CN201320865923.4U patent/CN203673028U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103675628A (en) * | 2013-12-26 | 2014-03-26 | 东风商用车有限公司 | High-voltage insulation monitoring and protecting system for electric vehicle and using method thereof |
| CN103675628B (en) * | 2013-12-26 | 2017-01-04 | 东风商用车有限公司 | High-voltage insulation monitoring and protecting system for electric vehicle and using method thereof |
| CN109239537A (en) * | 2017-07-10 | 2019-01-18 | 比亚迪股份有限公司 | The Insulation Inspection System of train and train |
| CN109239538A (en) * | 2017-07-10 | 2019-01-18 | 比亚迪股份有限公司 | The Insulation Inspection System of train and train |
| CN109239562A (en) * | 2017-07-10 | 2019-01-18 | 比亚迪股份有限公司 | The Insulation Inspection System of train and train |
| CN108152685A (en) * | 2017-11-29 | 2018-06-12 | 国网河南省电力公司偃师市供电公司 | A kind of electric power system low frequency insulation detection device and method |
| CN113039448A (en) * | 2018-09-13 | 2021-06-25 | 美达系统有限公司 | System for checking electrical insulation in a converter of an electric vehicle |
| CN114167191A (en) * | 2021-12-16 | 2022-03-11 | 深圳市道通科技股份有限公司 | Automobile power converter detection method and system and computer equipment |
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