CN110346641A - A kind of insulation resistance detection system and method - Google Patents
A kind of insulation resistance detection system and method Download PDFInfo
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- CN110346641A CN110346641A CN201810307529.6A CN201810307529A CN110346641A CN 110346641 A CN110346641 A CN 110346641A CN 201810307529 A CN201810307529 A CN 201810307529A CN 110346641 A CN110346641 A CN 110346641A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
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Abstract
The present invention discloses the detection system and method for a kind of insulation resistance, and driving source is pulse signal, rather than high-tension battery packet voltage, the insulating resistance value being calculated are not influenced by the position of insulation resistance, and calculated result is accurate；Injection is inverted M sequence, and detects corresponding response, by the correlativity between input/output signal, load transfer function coefficient is calculated, and then calculate the insulation resistance of high-pressure system.The new system that signal infusion circuit and high-pressure system are constituted, transit time is shorter, therefore shortens detection time；Inverted M sequence has certain rejection ability to system noise, improves anti-interference ability.Realize the raising of detection accuracy and anti-interference ability and the shortening of detection time.
Description
Technical field
The present invention relates to technical field of new energy, more specifically to a kind of insulation resistance detection system and side
Method.
Background technique
New-energy automobile middle-and-high voltage system is throughout entire vehicle body, so that the contact probability of high-pressure system and low-pressure system is significantly
Increase, brings challenges to the high-voltage safety of new-energy automobile.Therefore, the insulation resistance detection between high and low pressure system is very heavy
It wants.What the insulation resistance between high and low pressure system reflected is the insulation situation between high-pressure system and low-pressure system.High-pressure system
Such as high-tension battery packet, power transmission line, motor, electric machine controller；Low-pressure system refers to by the battery-powered system of lead acid storage battery.
Ideally, completely insulated between high-pressure system and low-pressure system.It is much connect in fact, having between high and low pressure system on vehicle
Contacting surface, such as insulating layer, isolating device, can have distributed parasitic resistance, these distributed parasitic resistance aggregate performances are exhausted
Edge resistance.
The method for detecting insulation resistance at this stage has:
Bridge circuit method.The testing principle of bridge circuit method is as shown in Figure 1.Assuming that high-voltage positive electrode and high voltage negative are to low pressure
There are the first insulation resistance Riso1 and the second insulation resistance Riso2 in ground respectively.Closure switch S1 disconnects switch S2, the first electricity of measurement
Hinder R1 both end voltage；It is closed S2, disconnects S1, measures second resistance R2 both end voltage.By the series-parallel partial pressure relationship of resistance, calculate
Insulation resistance of the high pressure positive and negative anodes to low pressure ground out.But it due to the presence of high-pressure system capacitor C1, C2, needs by upper and lower
For arm resistance to capacitor charge and discharge, the time for needing to wait is long；In addition, when high-pressure system is power battery, when it is intermediate certain
Core insulation against ground of economizing on electricity is failed, for example sampling line is damaged, and the insulation resistance error that bridge circuit method detected is larger.
Low-frequency pulse injection method.The basic ideas of low-frequency pulse method for implanting are that low-pressure side issues low frequency pulse signal, are led to
The method for crossing external resistor or capacitor is coupled to high-pressure side, then flows back into low-pressure side by high-tension side insulation resistance.It issues
Signal, external resistor pass through insulation resistance, coupling resistance or capacitor, issue signal, reflux it is known that returned signal can detecte
Relationship of the signal between this can find out insulating resistance value.But if high-pressure system there are Y capacitances and parasitic capacitance
When, it is not algebraic relation or first differential relationship between returned signal and sending signal, so that the calculated result of insulation resistance
Error is larger；In addition, common pulse signal is weaker to the anti-interference ability of system noise, it is only suitable for small noise environment or nothing
Noise circumstance.
Summary of the invention
In view of this, the present invention proposes a kind of insulation resistance detection system and method, it is intended to realize the inspection for improving insulation resistance
It surveys precision and reduces detection time, improve the purpose of anti-interference ability.
To achieve the goals above, it is proposed that scheme it is as follows:
A kind of detection system of insulation resistance, comprising: micro-control unit, signal infusion circuit and signal detection circuit；
The micro-control unit, for the characteristic according to the signal infusion circuit and the new system of high-pressure system composition
Inverted M sequence is calculated；
The signal infusion circuit, for the inverted M sequence to be injected into the high-pressure system；
The signal detection circuit, for detecting response of the high-pressure system after injecting the inverted M sequence；
The micro-control unit is also used to be calculated the load transfer function coefficient of the new system according to the response, with
And the insulation resistance of high-pressure system is calculated according to the load transfer function coefficient.
Preferably, the signal infusion circuit includes: the first operational amplifier, coupling resistance and coupled capacitor；
The signal output end of the micro-control unit passes sequentially through first operational amplifier, the coupling resistance, institute
It states coupled capacitor and connects the high-pressure system.
Preferably, the signal detection circuit includes: second operational amplifier, filter resistance and filter capacitor；
The sampling end of the micro-control unit passes sequentially through the filter resistance, the second operational amplifier is connected to institute
State the junction of coupling resistance and the coupled capacitor；
One end of the filter capacitor is connected to the junction of the filter resistance and the sampling end, other end ground connection.
Preferably, the input impedance of the second operational amplifier is greater than 100M Ω.
A kind of detection method of insulation resistance, applied to system described in above-mentioned any one, which comprises
Inverted M sequence is calculated in the characteristic of the new system constituted according to the signal infusion circuit and high-pressure system；
Export the inverted M sequence；
Obtain response of the high-pressure system after injecting the inverted M sequence；
According to the response, the load transfer function coefficient of the new system is calculated；
The insulation resistance of high-pressure system is calculated according to the load transfer function coefficient.
Compared with prior art, technical solution of the present invention has the advantage that
The detection system and method for a kind of insulation resistance that above-mentioned technical proposal provides, driving source is pulse signal, rather than
High-tension battery packet voltage, the insulating resistance value being calculated are not influenced by the position of insulation resistance, and calculated result is accurate；Injection
It is inverted M sequence, and detects corresponding response, by the correlativity between input/output signal, transmission function is calculated
Parameter, and then the insulation resistance of high-pressure system is calculated, the new system of signal infusion circuit and high-pressure system composition, when excessive
Between it is shorter, therefore shorten detection time；Inverted M sequence has certain rejection ability to system noise, improves anti-interference ability.It is real
The raising of detection accuracy and anti-interference ability and the shortening of detection time are showed.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the circuit diagram of the testing principle of bridge circuit method；
Fig. 2 is a kind of structural schematic diagram of the detection system of insulation resistance provided in an embodiment of the present invention；
Fig. 3 is a kind of concrete structure schematic diagram of the detection system of insulation resistance provided in an embodiment of the present invention；
Fig. 4 is a kind of flow chart of the detection method of insulation resistance provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The present embodiment provides a kind of detection systems of insulation resistance, and referring to fig. 2, which includes: micro-control unit 11, letter
Number infusion circuit 12 and signal detection circuit 13
Micro-control unit 11, i.e. MCU, for inverted M sequence to be calculated according to the characteristic of high-pressure system 14.Inverted M sequence is
A kind of pseudo-random sequence has characteristic similar with white noise.It is constituted according to signal infusion circuit 12 and high-pressure system 14 new
The characteristic of system, i.e., the transmission function of the new system constituted according to signal infusion circuit 12 and high-pressure system 14, obtains new system
Transit time TsWith highest cutoff frequency fmax.Inverted M sequence is obtained, needs first to obtain the pulse width t and M sequence of M sequence
Period N*t.According to criterion t < 1/3fmax, 2N*t > Ts, obtain the pulse width t and M sequence period N*t of M sequence.It will obtain
M sequence and square-wave signal take exclusive or, obtain inverted M sequence.High-pressure system 14 includes insulation resistance R2 and Y capacitance C2.
Signal infusion circuit 12, the inverted M sequence for exporting micro-control unit 11 are injected into high-pressure system 14.Signal
Infusion circuit 12 reduces the impedance of 11 output signal of micro-control unit (i.e. inverted M sequence), improves signal driving capability.
Signal detection circuit 13, for detecting response of the high-pressure system 14 after injecting inverted M sequence.
Micro-control unit 11, is also used to be calculated the load transfer function coefficient of new system according to the response, and according to
The insulation resistance of high-pressure system is calculated in the load transfer function coefficient.The transmission function of new system is description system input and output
Relationship, for the present invention, the input of system refer to that the output of micro-control unit, the output of system are signal detection circuits
13 signals detected.
The ADC that micro-control unit 11 includes samples subelement, samples to the testing result in signal detection circuit 13.
The impulse response computation subunit that micro-control unit 11 includes samples adopting for subelement according to inverted M sequence and ADC
The unit impulse response curve of high-pressure system 12 is calculated in sample value.Specifically, known inverted M sequence { M (1), M (2) ..., M
(2N) }, and the corresponding voltage value z sequence of ADC sampling subelement is { z (1), z (2) ..., z (2N) }.Pass through inverted M sequence and z
The matrix of sequence calculates, so that it may obtain unit impulse response curve g.Inverted M sequence is made of a string of 0,1 data, such as one
A 3 rank M sequence, N=23- 1=7, corresponding opposite sequence period are 14, and inverted M sequence is { 00001001111011 }, that is, { M
(1), (2) M ..., M (2N) }.Formula by inverted M sequence and z sequence unit of account pulse respond is as follows:
Z=[z (2N+1) z (2N+1) K z (4N)]T
Wherein,Indicate the estimated value of pulse respond g, RMIndicate one of the auto-correlation function matrix of inverted M sequence
Point, z indicates the sampled value of ADC sampling subelement, and M indicates inverted M sequence.According to inverted M sequence and z sequence unit of account impulse response
Principle, and in detail calculating process be System Discrimination field the prior art, this embodiment is not repeated.
The parameter identification subelement that micro-control unit 11 includes, according to obtained unit impulse response curve g, in conjunction with
Hankel matrix method obtains discrete transmission function, and further according to bilinear transformation, the transmission function ginseng of high-pressure system is calculated
Number.The formula of discrete transfer function is calculated according to Han cola matrix method are as follows:
Transmission function is a few ranks, and n value is just several.Such as transmission function is 2 ranks, then n=2；
It finds outAfterwards, bilinear transformation can be done with that.Bilinear transformation is the one of discrete system and continuous system conversion
The very simple method of kind, it is only necessary to according to the following formula, Discrete Operator z be become into continuous operator s:
Wherein, t is inverted M sequence pulse width.
According to load transfer function coefficient, insulation resistance R2 is calculated.
Referring to Fig. 3, signal infusion circuit 12 includes the first operational amplifier U1, coupling resistance R1 and coupled capacitor C1.It is micro-
The signal output end of control unit 11 passes sequentially through the first operational amplifier U1, coupling resistance R1, coupled capacitor C1 connection high pressure
System 14.First operational amplifier U1 reduces the impedance of the output signal (i.e. inverted M sequence) of micro-control unit 11, improves signal
Driving capability.Coupling between high-low pressure is carried out using coupled capacitor C1, guarantees that the process of test will not reduce high-pressure system
Insulation resistance.
Signal detection circuit 13 includes second operational amplifier U2, filter resistance R3 and filter capacitor C3.Micro-control unit
11 sampling end passes sequentially through filter resistance R3, second operational amplifier U2 is connected to the company of coupling resistance R1 and coupled capacitor C1
Meet place.One end of filter capacitor C3 is connected to the junction of the sampling end of filter resistance R3 and microcontroller 11, filter capacitor C3
The other end ground connection.
Preferably, the input impedance of second operational amplifier U2 is greater than 100M Ω.Second operational amplifier U2 has very
High input impedance can reduce influence of the signal detection circuit 13 to system detection precision to the greatest extent.
Referring to Fig. 3, the transmission function of the new system of signal infusion circuit 12 and the composition of high-pressure system 14 are as follows:
Wherein, R1 and C1 is known, and C2 is the Y capacitance of high-pressure system 14, and R2 is the insulation resistance of high-pressure system 14.This
When one second order overdamp system, the rated value of the Y capacitance C2 of high-pressure system 14 be it is known, further according to the transmitting letter of new system
Number, obtains the transit time T of M sequencesWith highest cutoff frequency fmaxWhen, as soon as it can estimate a value of insulation resistance R2, then
It can be concluded that transition time TsWith highest cutoff frequency fmax.Parameter identification subelement in this way, according to obtained unit impulse response
Curve g obtains discrete transmission function in conjunction with Hankel matrix method, further according to bilinear transformation, calculates the transmitting letter of new system
When number parameter, the value R1R2C1C2, (R1C1+R2C2+R2C1), (R2C2+R2C1) of the parameter in transmission function is calculated.By
In R1 and C1 be known, it is possible to the insulation resistance R2 of high-pressure system 14 is calculated.
The present embodiment provides a kind of detection method of insulation resistance, applied to the detection system of above-mentioned insulation resistance, referring to
Fig. 4, this method comprises:
Step S11: the characteristic meter for the new system that micro-control unit 11 is constituted according to signal infusion circuit 12 and high-pressure system
Calculation obtains inverted M sequence；
According to the characteristic of new system, i.e., according to the transmission function of new system, obtain the transit time T of M sequencesIt is cut with highest
Only frequency fmax.Inverted M sequence is obtained, needs first to obtain the pulse width t and M sequence period N*t of M sequence, according to criterion t <
1/3fmax, 2N*t > Ts, obtain the pulse width t and M sequence period N*t of M sequence.Obtained M sequence and square-wave signal are taken
Exclusive or obtains inverted M sequence.High-pressure system 14 includes insulation resistance R2 and Y capacitance C2.
Step S12: the inverted M sequence that the output of micro-control unit 11 is calculated to signal infusion circuit 12；
Step S13: micro-control unit 11 obtains response of the high-pressure system 14 after injecting inverted M sequence；
Signal detection circuit 13 detects response of the high-pressure system 14 after injecting inverted M sequence, and response is transmitted to
Micro-control unit 11.After first inverted M sequence end cycle, new system transient process terminates, at this time in each inverted M sequence
Clock beat is sampled, and when second inverted M sequence end cycle, obtains a complete inverted M sequence and system to inverted M sequence
Accordingly.
Step S14: the load transfer function coefficient of new system is calculated according to the response in micro-control unit 11；
According to inverted M sequence and system to the corresponding of inverted M sequence, the unit impulse response curve of computing system, Jin Erji
Calculation obtains load transfer function coefficient.
Step S15: the insulation resistance of high-pressure system is calculated according to the load transfer function coefficient for micro-control unit 11.
Referring to Fig. 3, the transmission function of the new system of signal infusion circuit 12 and the composition of high-pressure system 14 are as follows:
Wherein, R1 and C1 is known, and C2 is the Y capacitance of high-pressure system 14, and R2 is the insulation resistance of high-pressure system 14.This
When one second order overdamp system, the rated value of the Y capacitance C2 of high-pressure system 14 be it is known, further according to the transmitting letter of new system
Number, obtains the transit time T of M sequencesWith highest cutoff frequency fmaxWhen, as soon as it can estimate a value of insulation resistance R2, then
It can be concluded that transition time TsWith highest cutoff frequency fmax.Parameter identification subelement in this way, according to obtained unit impulse response
Curve g obtains discrete transmission function in conjunction with Hankel matrix method, further according to bilinear transformation, calculates the transmitting letter of new system
When number parameter, the value R1R2C1C2, (R1C1+R2C2+R2C1), (R2C2+R2C1) of the parameter in transmission function is calculated.By
In R1 and C1 be known, it is possible to the insulation resistance R2 of high-pressure system 14 is calculated.
It should be noted that calculating R2 is an iterative process, most start to calculate M sequence, replaces insulation with an initial value
Transit time T has been calculated in resistance R2sWith highest cutoff frequency fmax；It is operated by some column, has obtained one compared with subject to
True insulation resistance R2 calculates new M sequence further according to obtained accurate insulation resistance R2, then obtains insulation resistance
R2.That is R2 is to constantly update.
Herein, relational terms such as first and second and the like be used merely to by an entity or operation with it is another
One entity or operation distinguish, and without necessarily requiring or implying between these entities or operation, there are any this reality
Relationship or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to the packet of nonexcludability
Contain, so that the process, method, article or equipment for including a series of elements not only includes those elements, but also including
Other elements that are not explicitly listed, or further include for elements inherent to such a process, method, article, or device.
In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including the element
Process, method, article or equipment in there is also other identical elements.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.
To the above description of disclosed embodiment of this invention, it can be realized professional and technical personnel in the field or use this
Invention.Various modifications to these embodiments will be readily apparent to those skilled in the art, institute herein
The General Principle of definition can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore,
The present invention will not be limited to the embodiments shown herein, and is to fit to special with principles disclosed herein and novelty
The consistent widest scope of point.
Claims (5)
1. a kind of detection system of insulation resistance characterized by comprising micro-control unit, signal infusion circuit and signal inspection
Survey time road；
The micro-control unit, for being calculated according to the characteristic of the signal infusion circuit and the new system of high-pressure system composition
To inverted M sequence；
The signal infusion circuit, for the inverted M sequence to be injected into the high-pressure system；
The signal detection circuit, for detecting response of the high-pressure system after injecting the inverted M sequence；
The micro-control unit is also used to be calculated the load transfer function coefficient of the new system, Yi Jigen according to the response
The insulation resistance of high-pressure system is calculated according to the load transfer function coefficient.
2. system according to claim 1, which is characterized in that the signal infusion circuit include: the first operational amplifier,
Coupling resistance and coupled capacitor；
The signal output end of the micro-control unit passes sequentially through first operational amplifier, the coupling resistance, the coupling
Close high-pressure system described in capacitance connection.
3. system according to claim 2, which is characterized in that the signal detection circuit include: second operational amplifier,
Filter resistance and filter capacitor；
The sampling end of the micro-control unit passes sequentially through the filter resistance, the second operational amplifier is connected to the coupling
Close the junction of resistance and the coupled capacitor；
One end of the filter capacitor is connected to the junction of the filter resistance and the sampling end, other end ground connection.
4. system according to claim 3, which is characterized in that the input impedance of the second operational amplifier is greater than 100M
Ω。
5. a kind of detection method of insulation resistance, which is characterized in that be applied to as described in Claims 1 to 4 any one
System, which comprises
Inverted M sequence is calculated in the characteristic of the new system constituted according to the signal infusion circuit and high-pressure system；
Export the inverted M sequence；
Obtain response of the high-pressure system after injecting the inverted M sequence；
According to the response, the load transfer function coefficient of the new system is calculated；
The insulation resistance of high-pressure system is calculated according to the load transfer function coefficient.
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| CN113655279A (en) * | 2021-08-13 | 2021-11-16 | 海南师范大学 | Insulation resistance value detection method during disconnection of power battery of electric automobile |
| CN113655281A (en) * | 2021-08-13 | 2021-11-16 | 海南师范大学 | Insulation resistance value detection method during disconnection of power battery of electric automobile |
| CN113655280A (en) * | 2021-08-13 | 2021-11-16 | 海南师范大学 | Insulation resistance value detection method during connection of power battery of electric automobile |
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| CN113655281B (en) * | 2021-08-13 | 2023-09-26 | 海南师范大学 | Insulation resistance value detection method during disconnection of electric automobile power battery |
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| CN110346641B (en) | 2021-12-07 |
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