CN207817067U - A kind of electric automobile power battery insulation resistance monitoring device based on width phase testing principle - Google Patents
A kind of electric automobile power battery insulation resistance monitoring device based on width phase testing principle Download PDFInfo
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- CN207817067U CN207817067U CN201721431590.9U CN201721431590U CN207817067U CN 207817067 U CN207817067 U CN 207817067U CN 201721431590 U CN201721431590 U CN 201721431590U CN 207817067 U CN207817067 U CN 207817067U
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Abstract
The utility model discloses a kind of electric automobile power battery insulation resistance monitoring devices based on width phase testing principle, including sine wave generation circuit, feedback signal sample circuit, sinusoidal ac signal amplitude detection circuit, feedback signal amplitude detection circuit, phase difference measuring circuit.Wherein sine wave generation circuit is for generating sinusoidal ac signal, the signal source as system；Feedback signal sample circuit is used for sampling system feedback signal；Sinusoidal ac signal amplitude detection circuit is for detecting sinusoidal ac signal amplitude；Feedback signal amplitude detection circuit is for detecting feedback signal amplitude；Phase difference measuring circuit is used to detect the phase difference between feedback signal and sinusoidal ac signal.After control unit obtains measuring signal, calculates formula using insulation resistance and calculate insulation resistance.The utility model may be implemented to detect in real time, eliminates influence of the parasitic capacitance to testing result, improves system detectio precision.
Description
Technical field
The utility model is related to the monitoring technical fields of power battery insulation resistance, more particularly to a kind of mutually to be detected based on width
The electric automobile power battery insulation resistance monitoring device of principle.
Background technology
In order to meet electric powered motor demand, the battery voltage of electric vehicle is substantially all more than hundreds of volts.Therefore
In order to ensure the personal safety of passenger and the reliability service of system, real time on-line monitoring battery pack positive and negative electrode pair is needed
Ground insulation resistance.
Patent No. 201210425994.2 discloses a kind of DC insulation monitoring instrument, is a kind of by Hall current sensor
The measurement scheme combined with electric bridge detects DC bus Ground leakage current, switching access resistance structure using Hall current sensor
Measuring bridge is built, insulation resistance is solved to build circuit equation.The disadvantages of this solution is that current sensor is easy by temperature drift
It influences, while when leakage current is smaller, current sensor is difficult that accurately detected, to influence the accuracy of detection of system.
Patent No. 201310402311.6 discloses a kind of electric automobile high-voltage insulation detecting method and system, basic
Principle is charged to high-voltage capacitor using high-pressure generating circuit, is carried out to high-voltage capacitor using insulation resistance and parasitic capacitance
Electric discharge solves insulation resistance further according to capacitance flash-over characteristic.The disadvantages of this solution is that frequent high-voltage charge and discharge inherently damages
Detecting system and battery pack, to reduce the reliability of system.
Therefore above detection scheme practical application effect is unsatisfactory.
Utility model content
The purpose of this utility model is to provide a kind of electric automobile power battery insulation resistance based on width phase testing principle
Monitoring device, it can realize electric automobile power battery insulation resistance monitoring function.
In order to solve the above technical problems, technical solution used by the utility model is：
A kind of electric automobile power battery insulation resistance monitoring device based on width phase testing principle, including sine wave generate
Circuit, feedback signal sample circuit, sinusoidal ac signal amplitude detection circuit, feedback signal amplitude detection circuit, phase difference are surveyed
Circuit is measured, wherein the sine wave generation circuit is used to generate sinusoidal ac signal, the signal source as system；Feedback signal
Sample circuit is used for sampling system feedback signal；Sinusoidal ac signal amplitude detection circuit is for detecting sinusoidal ac signal width
Value；Feedback signal amplitude detection circuit is for detecting feedback signal amplitude；Phase difference measuring circuit for detect feedback signal and
Phase difference between sinusoidal ac signal.
Further, the sine wave generation circuit is by amplifying circuit, positive-feedback circuit, frequency-selective network, fixed ampllitude link
Composition.
Further, feedback signal sample circuit by high-precision feedback resistance, current-limiting resistance and isolation capacitance build and
At；Feedback resistance is used for sampling feedback voltage；Current-limiting resistance is realized using voltage divider principle to battery pack high-voltage and current-limitation, after protection
Continuous circuit；Isolation capacitance reduces influence of the high direct voltage to detecting system for battery pack high pressure to be isolated.
Further, sinusoidal ac signal amplitude detection circuit and feedback signal amplitude detection circuit are by amplifying circuit, height
Fast AD sampling A/D chips circuit is built-up；Amplifying circuit realizes enlarging function to measured signal, so that it is met AD samplings and wants
It asks；High-speed AD sampling A/D chip circuit is used for high-speed sampling measured signal, reduces the distortion factor of measured signal.
Further, phase difference measuring circuit is built-up by shaping circuit, bistable flip-flop circuit.
Compared with prior art, the utility model has the beneficial effects that：
1. the utility model is chosen suitable signal amplitude, can be reduced note by the way of sinusoidal ac signal injection
Enter damage of the signal to battery pack, while measurement result is independent of battery voltage, to reduce battery pack high pressure to detection
As a result influence.
2. the utility model may be implemented to detect in real time using width phase testing principle, the working condition no requirement (NR) to vehicle.
3. the utility model is for detecting bilateral insulation resistance, to simultaneously decline situation equally applicable, still can effectively examine
Measure the insulation resistance of system.
4. the utility model considers battery set electrode influence of the parasitic capacitance to detecting system over the ground, by parasitic capacitance
As one of the parameter that insulation resistance calculates, system detectio precision can be improved.
Description of the drawings
Fig. 1 is the utility model insulating monitoring principle assumption diagram；
Fig. 2 is the utility model insulating monitoring theory structure schematic diagram.
Reference numeral meaning is in figure：1 is sine wave generation circuit, and 2 be feedback signal sample circuit, and 3 be simple alternating current
Signal amplitude detection circuit, 4 be feedback signal amplitude detection circuit, and 5 be phase difference measuring circuit.
Specific implementation mode
Below in conjunction with the accompanying drawings and specific implementation mode further illustrates the utility model.
A kind of electric automobile power battery insulation resistance monitoring device based on width phase testing principle of the utility model,
Structure is as shown in Figure 1, include：Sine wave generation circuit 1, feedback signal sample circuit 2, sinusoidal ac signal amplitude detection circuit
3, feedback signal amplitude detection circuit 4, phase difference measuring circuit 5.
The sine wave generation circuit, as the signal source of system, the sine of generation is believed for generating sinusoidal signal
It number is injected into automobile chassis by injection circuit.
Specifically, the sine wave generation circuit is for generating sinusoidal signal, by amplifying circuit, positive-feedback circuit,
Frequency-selective network, fixed ampllitude link composition.Amplifying circuit is amplified input signal；Output signal is introduced into defeated by positive-feedback circuit
Enter end, as feedback signal；Frequency-selective network is used to select to meet the specific frequency of system starting condition for oscillation, to obtain single-frequency
Sinusoidal signal；Fixed ampllitude link is used for the oscillation of systems stabilisation, inhibits wave distortion.
The feedback signal sample circuit, the AC signal for acquisition system feedback.
Specifically, the feedback signal sample circuit is taken by high-precision feedback resistance, current-limiting resistance, isolation capacitance
It builds, using circuit voltage divider principle, realizes feedback signal sampling functions.Sine wave is as system input signal, feedback resistance
Output signal of the terminal voltage as system.
The feedback signal amplitude detection circuit and sinusoidal ac signal amplitude detection circuit is respectively used to detection feedback
The amplitude and sinusoidal signal amplitude of signal, the ratio between numerical value are transmission function modulus value.
Specifically, the sinusoidal ac signal amplitude detection circuit and its circuit of feedback signal amplitude detection circuit are former
Manage almost the same, built-up by amplifying circuit and high-speed AD sampling A/D chip circuit, amplifying circuit is put for realizing measured signal
Big function；High speed A/D chip realizes signal amplitude high-speed sampling, reduces the distortion of signal.
The phase difference measuring circuit, the phase difference for detecting feedback signal and sinusoidal signal, numerical value are to be
System transmission function phase, while phase difference is influenced by sinusoidal signal frequency.
Specifically, the phase difference measuring circuit is made of circuits such as shaping circuit, flip and flop generators, wherein whole
Shape circuit is made of Schmitt trigger circuit, using positive feedback principle threshold voltage is become as output voltage changes
Change, the anti-interference ability of system can be improved.Two waveforms after integer are believed as the input of bistable flip-flop circuit
Number, signal phase difference is detected by this circuit.Microprocessor is used to obtain insulation resistance using measuring signal.
Microprocessor, conventional electronics, the connection of custom circuit and control planning belong to the public affairs of those skilled in the art
Know common sense, repeated in the present specification without detailed, those skilled in the art can carry out chip according to practical situations
Type selecting selects known approaches to carry out wiring connection to each electronic chip.
Claims (5)
1. a kind of electric automobile power battery insulation resistance monitoring device based on width phase testing principle, it is characterised in that：Including
Sine wave generation circuit (1), feedback signal sample circuit (2), sinusoidal ac signal amplitude detection circuit (3), feedback signal width
It is worth detection circuit (4), phase difference measuring circuit (5), wherein the sine wave generation circuit is used to generate sinusoidal ac signal,
Signal source as system；Feedback signal sample circuit is used for sampling system feedback signal；Sinusoidal ac signal amplitude detection electricity
Road is for detecting sinusoidal ac signal amplitude；Feedback signal amplitude detection circuit is for detecting feedback signal amplitude；Phase difference is surveyed
Amount circuit is used to detect the phase difference between feedback signal and sinusoidal ac signal.
2. a kind of electric automobile power battery insulation resistance monitoring dress based on width phase testing principle according to claim 1
It sets, it is characterised in that：The sine wave generation circuit (1) is by amplifying circuit, positive-feedback circuit, frequency-selective network, fixed ampllitude link
Composition.
3. a kind of electric automobile power battery insulation resistance monitoring dress based on width phase testing principle according to claim 1
It sets, it is characterised in that：Feedback signal sample circuit (2) by high-precision feedback resistance, current-limiting resistance and isolation capacitance build and
At；Feedback resistance is used for sampling feedback voltage；Current-limiting resistance is realized using voltage divider principle to battery pack high-voltage and current-limitation, after protection
Continuous circuit；Isolation capacitance reduces influence of the high direct voltage to detecting system for battery pack high pressure to be isolated.
4. a kind of electric automobile power battery insulation resistance monitoring dress based on width phase testing principle according to claim 1
It sets, it is characterised in that：Sinusoidal ac signal amplitude detection circuit (3) and feedback signal amplitude detection circuit (4) by amplifying circuit,
High-speed AD sampling A/D chip circuit is built-up；Amplifying circuit realizes enlarging function to measured signal, so that it is met AD samplings and wants
It asks；High-speed AD sampling A/D chip circuit is used for high-speed sampling measured signal, reduces the distortion factor of measured signal.
5. a kind of electric automobile power battery insulation resistance monitoring dress based on width phase testing principle according to claim 1
It sets, it is characterised in that：Phase difference measuring circuit (5) is built-up by shaping circuit, bistable flip-flop circuit, anti-for detecting
Phase difference between feedback signal and sinusoidal ac signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721431590.9U CN207817067U (en) | 2017-10-31 | 2017-10-31 | A kind of electric automobile power battery insulation resistance monitoring device based on width phase testing principle |
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| CN201721431590.9U CN207817067U (en) | 2017-10-31 | 2017-10-31 | A kind of electric automobile power battery insulation resistance monitoring device based on width phase testing principle |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107727934A (en) * | 2017-10-31 | 2018-02-23 | 中国科学技术大学 | A kind of electric automobile power battery insulation resistance monitoring device based on width phase Cleaning Principle |
| CN110967559A (en) * | 2019-03-01 | 2020-04-07 | 宁德时代新能源科技股份有限公司 | Insulation detection circuit, method and battery management system |
-
2017
- 2017-10-31 CN CN201721431590.9U patent/CN207817067U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107727934A (en) * | 2017-10-31 | 2018-02-23 | 中国科学技术大学 | A kind of electric automobile power battery insulation resistance monitoring device based on width phase Cleaning Principle |
| CN110967559A (en) * | 2019-03-01 | 2020-04-07 | 宁德时代新能源科技股份有限公司 | Insulation detection circuit, method and battery management system |
| WO2020177636A1 (en) * | 2019-03-01 | 2020-09-10 | 宁德时代新能源科技股份有限公司 | Insulation detection circuit and method, and battery management system |
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