CN205643517U - Electric automobile high voltage insulation fault locating device - Google Patents
Electric automobile high voltage insulation fault locating device Download PDFInfo
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- CN205643517U CN205643517U CN201620512045.1U CN201620512045U CN205643517U CN 205643517 U CN205643517 U CN 205643517U CN 201620512045 U CN201620512045 U CN 201620512045U CN 205643517 U CN205643517 U CN 205643517U
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- resistance
- branch road
- pulse signal
- operational amplifier
- electric automobile
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Abstract
The utility model discloses an electric automobile high voltage insulation fault locating device, including low -frequency pulse signal generator, high -frequency pulse signal generator, an operational amplifier, select switch, the 2nd operational amplifier and sampling circuit, sampling circuit includes first branch road, second branch road and the 5th resistance, and the one end of first branch road is connected in electric automobile high voltage battery's an electrode, the one end of second branch road connect in another electrode of high voltage battery, the one end of the 5th resistance of connection behind the other end parallel connection of first branch road and second branch road, an operational amplifier's an input passes through select switch to be connected in high voltage battery's positive pole or negative pole, and the 2nd operational amplifier's an input is connected in the parallel connection point of first branch road with the second branch road. This electric automobile high voltage insulation fault locating device simple structure, detectable electric automobile's insulation resistance and fixing a position insulation fault.
Description
Technical field
This utility model relates to electric automobile safety testing field, particularly relates to a kind of electric automobile high-voltage exhausted
Edge fault locator.
Background technology
At present, the most common electric automobile insulation monitoring device is mainly with bus terminal voltage method and low frequency letter
Number injection method two kinds.Patent CN203422422U, CN101158701A, CN101603986A are the openest
The monitoring system of a kind of high-pressure system insulation resistance based on bus terminal voltage method, utilizes bridge method, passes through
The relay switch on the positive and negative both sides of high pressure, 3 kinds of assembled state turning off of Guan Bi measure positive and negative insulating resistance values,
Bus terminal voltage method is incorporated to the voltage between the forward and backward dc bus of measuring resistance and electricity chassis by measurement, can
It is calculated the insulating resistance value of system, but Comparision is unreliable, high-pressure system is required higher (including
Magnitude of voltage, stability etc.), it is impossible to short circuit fault over the ground inside response high-tension battery.Patent CN102749562A
Disclose the metering system using low frequency signal method, utilize low frequency signal test insulating resistance value in parallel, low frequency
Signal injection method injects low-frequency ac signal between system dc bus and chassis, and low frequency signal can be automatic
Adaptive system drain capacitance and the size of insulation resistance, certainty of measurement is higher, and reliability is higher, to high-pressure system
Require low, but exist and can only test insulating resistance value in parallel, it is impossible to testing high voltage voltage, it is impossible to location event
The problems such as barrier point.
Utility model content
The technical problems to be solved in the utility model, it is provided that one is easy to detect insulation resistance and determine high pressure
The electric automobile high-voltage insulation fault location device of insulation fault position.
This utility model is achieved in that
A kind of electric automobile high-voltage insulation fault location device, including low-frequency pulse signal generator, high frequency arteries and veins
Rush signal generator, the first operational amplifier, select switch, the second operational amplifier, sample circuit and place
Reason device unit；
Described low-frequency pulse signal generator is for injecting low frequency pulse signal to automobile case；
Described high-frequency pulse signal generator is for injecting high-frequency pulse signal to automobile case；
Described sample circuit includes by the first resistance and the first branch road of the second resistant series, by the 3rd electricity
Hindering the second branch road with the 4th resistant series and the 5th resistance, one end of described first branch road is connected to electricity
One electrode of electrical automobile high-tension battery, one end of the second branch road is connected to another electrode of described high-tension battery,
The other end of the first branch road and the second branch road connects one end of the 5th resistance, the 5th resistance another after being connected in parallel
One end ground connection；
One input of described first operational amplifier is by the described positive pole selecting switch to be connected to high-tension battery
Or be connected to the negative pole of high-tension battery, an input of described second operational amplifier be connected to the first branch road with
Being connected in parallel a little of second branch road；
The outfan of described first operational amplifier and the second operational amplifier is connected to described processor list
Unit.
Further, described processor unit is arm processor or dsp processor.
Further, the resistance of described first resistance, the second resistance, the 3rd resistance and the 4th resistance is equal.
Further, the output voltage of described low-frequency pulse signal generator is 0.1Hz for ± 40V frequency.
Further, the output voltage of described high-frequency pulse signal generator be 0-20V frequency be 1MHz.
This utility model has the advantage that this utility model electric automobile high-voltage insulation fault location device bag
Include low-frequency pulse signal generator, high-frequency pulse signal generator, the first operational amplifier, the second computing are put
Big device, sample circuit and processor unit, according to described first operational amplifier and the second operational amplifier
Output voltage not only can get electric automobile shell to high-tension battery both positive and negative polarity insulation resistance, and, electric wave exists
Spread speed in cable, and the time of echo, also can carry out insulation fault point calculating location, improve
The efficiency of failture evacuation and maintenance.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of this utility model embodiment electric automobile high-voltage insulation fault location device.
Detailed description of the invention
By describing technology contents of the present utility model, structural feature in detail, being realized purpose and effect, below
In conjunction with embodiment and coordinate accompanying drawing to be explained in detail.
Refer to Fig. 1, for the circuit of this utility model embodiment electric automobile high-voltage insulation fault location device
Schematic diagram.This electric automobile high-voltage insulation fault location device, including low-frequency pulse signal generator (Fig. 1
In low frequency signal), high-frequency pulse signal generator (high-frequency signal in Fig. 1), the first operational amplifier
U1, the second operational amplifier U2, alternative select switch S1, sample circuit (R1～R4 in Fig. 1)
With processor unit (Fig. 1 does not embodies).Wherein, Rv is that virtual resistance is insulation resistance.
Described low-frequency pulse signal generator is for injecting low frequency pulse signal to automobile case, and low frequency pulse signal is sent out
The output voltage of raw device is 0.1Hz for ± 40V frequency；Described high-frequency pulse signal generator is used for producing high frequency
Signal is also injected on automobile case, and the output voltage of high-frequency pulse signal generator is that 0-20V frequency is
The direction of arrow in 1MHz, Fig. 1 is low frequency signal flow direction.
Described sample circuit includes the first branch road being in series by the first resistance R1 and the second resistance R2, by
The second branch road that 3rd resistance R3 and the 4th resistance R4 is in series and the 5th resistance Rh, described first branch road
One end be connected to the positive pole of electric automobile high-voltage battery, one end of the second branch road is connected to described high-tension battery
Negative pole, the other end of the first branch road and the second branch road be connected in parallel after connect the 5th resistance Rh.
One input of described first operational amplifier U1 is connected to alternative and selects the fixing output of switch S1
End, selects switch S1 mono-to select input to be connected to the positive pole of high-tension battery, and another selects input to be connected to
The negative pole of high-tension battery, by the described input selecting switch S1 to may select the first operational amplifier U1 be
It is connected to the negative or positive electrode of high-tension battery；One input of described second operational amplifier U2 is connected to first
Being connected in parallel a little of branch road and the second branch road.
The outfan of described first operational amplifier U1 and the second operational amplifier U2 is connected to described place
Reason device unit.Wherein, described processor unit is for the first operational amplifier U1 and the second operational amplifier
The output signal of U2 is analyzed processing.In the present embodiment, described processor unit is ARM process
Device, in other embodiments, described processor unit can be single-chip microcomputer or DSP.Preferably, described
First operational amplifier U1 and the second operational amplifier U2 uses TI company OPA Series Precision operation amplifier
Device.
In the present embodiment, described first resistance, the second resistance, the 3rd resistance and the resistance of the 4th resistance
Equal, and described first resistance, the second resistance, the 3rd resistance and the 4th resistance be allowable error be 1%
Precision resister.
This utility model electric automobile high-voltage insulation fault location device be employed technical scheme comprise that a kind of based on
The insulation detecting method that low frequency pulse signal injects, it uses low frequency pulse signal to inject detection car load insulating properties
Can, start insulating monitoring when pulse signal injects, height can be calculated by the change in voltage of acquisition circuit
The detection of the fault that whether is short-circuited between negative insulation resistance and the high pressure both positive and negative polarity to car shell ground of positive pressure.
First producing a low frequency signal amplitude from low-frequency pulse signal generator is V1, is injected by connecting line
Car shell ground, direction is the sense of current that in Fig. 1, arrow represents, is just importing to high pressure by virtual resistance Rv
On negative pole, more finally carry out at Rh through R1, R2 and R3, R4 (4 resistance values are equal) herein
Dividing potential drop also gathers voltage, after being processed by the second operational amplifier U2 discharge circuit, enters processor unit
(CPU) sampled voltage V2 is obtained.Pass through formula
Rv={ (V1/V2) * Rh-[(R1+R2) * (R3+R4)]/[(R1+R2)+(R3+R4)]-Rh} is calculated virtual electricity
The resistance value of resistance Rv is insulation resistance.When insulation resistance value exception occurs when (less than minimum threshold or
Higher than max-thresholds), then disconnect high-tension battery, simultaneously close off low frequency pulse signal, and allow high-frequency pulse signal
Generator is started working, by selecting switch S1 to select high voltage negative bus or positive electrode bus are carried out fault
Location, carries out voltage sample analysis, according to formula by the first operational amplifier U1: L=0.5 υ * Δ T can
To be calculated abort situation, wherein υ is electric wave spread speed in cable, and Δ T is the time of echo.
Again because of formula:
Wherein C is the light velocity, and ε is insulant relative dielectric constant, and μ is insulant relative permeability.
Can obtain υ after high-voltage wiring harness determines according to these is a fixed value.Again according to reflection coefficient
P=(Zx-Z0)/(Zx+Z0) wherein Zx be characteristic impedance at fault, Z0 is characteristic impedance at fault-free.Work as fault
It is that Zx is less than Z for short trouble0Obtaining reflection coefficient is that between-1 to 0, echo is less than incidence wave, otherwise
When fault be short open fault be that Zx is more than Z0Obtain reflection coefficient be between 0 to 1 echo little be more than into
Ejected wave.High-voltage wiring harness fault type and abort situation can be obtained by sample waveform data according to above formula.
The foregoing is only embodiment of the present utility model, not thereby limit the scope of the claims of the present utility model,
Every equivalent shapes utilizing this utility model description and accompanying drawing content to be made or reconfiguration, or directly or
Indirectly it is used in other relevant technical fields, is the most in like manner included in scope of patent protection of the present utility model.
Claims (5)
1. an electric automobile high-voltage insulation fault location device, it is characterised in that include low frequency pulse signal
Generator, high-frequency pulse signal generator, the first operational amplifier, select switch, the second operational amplifier,
Sample circuit and processor unit；
Described low-frequency pulse signal generator is for injecting low frequency pulse signal to automobile case；
Described high-frequency pulse signal generator is for injecting high-frequency pulse signal to automobile case；
Described sample circuit includes by the first resistance and the first branch road of the second resistant series, by the 3rd electricity
Hindering the second branch road with the 4th resistant series and the 5th resistance, one end of described first branch road is connected to electricity
One electrode of electrical automobile high-tension battery, one end of the second branch road is connected to another electrode of described high-tension battery,
The other end of the first branch road and the second branch road connects one end of the 5th resistance, the 5th resistance another after being connected in parallel
One end ground connection；
One input of described first operational amplifier is by the described positive pole selecting switch to be connected to high-tension battery
Or be connected to the negative pole of high-tension battery, an input of described second operational amplifier be connected to the first branch road with
Being connected in parallel a little of second branch road；
The outfan of described first operational amplifier and the second operational amplifier is connected to described processor list
Unit.
Electric automobile high-voltage insulation fault location device the most according to claim 1, it is characterised in that
Described processor unit is arm processor or dsp processor.
Electric automobile high-voltage insulation fault location device the most according to claim 1, it is characterised in that
The resistance of described first resistance, the second resistance, the 3rd resistance and the 4th resistance is equal.
Electric automobile high-voltage insulation fault location device the most according to claim 1, it is characterised in that
The output voltage of described low-frequency pulse signal generator is 0.1Hz for ± 40V frequency.
Electric automobile high-voltage insulation fault location device the most according to claim 1, it is characterised in that
The output voltage of described high-frequency pulse signal generator be 0-20V frequency be 1MHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620512045.1U CN205643517U (en) | 2016-05-30 | 2016-05-30 | Electric automobile high voltage insulation fault locating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620512045.1U CN205643517U (en) | 2016-05-30 | 2016-05-30 | Electric automobile high voltage insulation fault locating device |
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| Publication Number | Publication Date |
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| CN205643517U true CN205643517U (en) | 2016-10-12 |
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| CN201620512045.1U Active CN205643517U (en) | 2016-05-30 | 2016-05-30 | Electric automobile high voltage insulation fault locating device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113009302A (en) * | 2021-03-18 | 2021-06-22 | 奇瑞新能源汽车股份有限公司 | Method and device for positioning insulation fault of high-voltage system of electric automobile |
-
2016
- 2016-05-30 CN CN201620512045.1U patent/CN205643517U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113009302A (en) * | 2021-03-18 | 2021-06-22 | 奇瑞新能源汽车股份有限公司 | Method and device for positioning insulation fault of high-voltage system of electric automobile |
| CN113009302B (en) * | 2021-03-18 | 2023-03-21 | 奇瑞新能源汽车股份有限公司 | Method and device for positioning insulation fault of high-voltage system of electric automobile |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |