CN103576064B - A kind of Insulation monitoring calibration steps with calibration module - Google Patents
A kind of Insulation monitoring calibration steps with calibration module Download PDFInfo
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- CN103576064B CN103576064B CN201310515978.7A CN201310515978A CN103576064B CN 103576064 B CN103576064 B CN 103576064B CN 201310515978 A CN201310515978 A CN 201310515978A CN 103576064 B CN103576064 B CN 103576064B
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Abstract
The invention discloses a kind of insulation detecting circuit with calibration module and calibration steps thereof, it is serially connected with relay (S3) and variable resistor (R5) between dc bus positive terminal and the ground of described insulation detecting circuit, between dc bus negative pole end and ground, is serially connected with relay (S4) and variable resistor (R6)；Sampling resistor (R1 ＇), (R2 ＇), (R3 ＇) and (R4 ＇) is connected to measure the voltage measurement plate of respective voltage, and connects host computer by CAN.According to equation U=A χ+B, by regulation variable resistor (R5) and the value of (R6), obtain the value of two groups of U and χ, substitute into equation, i.e. try to achieve calibration parameter A of sampling resistor both end voltage, the value of B.Insulation detecting circuit with calibration module of the present invention and calibration steps thereof, improve the accuracy of four sampling resistor voltages of insulation detecting circuit by the calibration of parameter, when circuit parameter changes, can improve the precision of Insulation monitoring.
Description
Technical field
The present invention relates to battery management system, particularly to a kind of apply on battery management system with calibration module
Insulation monitoring
Calibration steps.
Background technology
For the consideration to the energy and environment, electric automobile is rapidly developed because of its energy-conserving and environment-protective.In order to reach one
Fixed electric pressure, is usually used in series multiple batteries in electric automobile, and voltage range is between 300-500V.Electronic
In the middle of the actual motion of automobile, working environment is more complicated, the reason such as vibration abrasion, the change of temperature and humidity, liquid corrosion,
The decline of insulating properties will be caused, jeopardize the personal safety of occupant.Therefore, Insulation monitoring technology is electric automobile relation
One important technology of personal safety.
The patent application of Application No. 201110264050.7, as it is shown in figure 1, open a kind of electric automobile insulation of knowing clearly
Can detection method, method described in this application uses relay one, two to be connected with dc bus positive and negative electrode respectively, relay one
And between ground, seal in divider resistance R1 and R1 ', seal in divider resistance R2 and R2 ', dc source one between relay two and ground
Injecting direct current signal by diode D1 and resistance R3 to circuit, dc source two passes through diode D2 and resistance R4 to electricity
Direct current signal is injected on road.Resistance R1 ', R2 ', R3, R4 are respectively provided with voltage sampling circuit.Foregoing circuit coordinates specifically to be adopted
Sample and calculation procedure realize insulating properties detection.But the voltage sampling circuit of this kind of testing circuit would generally become due to parameter
Change, cause sampled measurements inaccurate, and then make Insulation monitoring produce bigger error.
Summary of the invention
For overcoming the shortcomings and deficiencies of above-mentioned prior art, the present invention provides a kind of Insulation monitoring school with calibration module
Quasi-method.
The technical solution used in the present invention is:
A kind of insulation detecting circuit with calibration module, for battery management system, described insulation detecting circuit, depending on car
Body is ground, and battery pack dc bus positive and negative electrode insulaion resistance over the ground is respectively R+ and R-；By dc bus positive terminal successively
Concatenation relay S1, the negative pole of diode D1, resistance R3 and sampling resistor R3 ＇, sampling resistor R3 ＇ other end ground connection, resistance R3
Two ends connect pwm signal output by transformer；Dc bus negative pole is sequentially connected in series relay S2, diode D2 just
Pole, resistance R4 and sampling resistor R4 ＇, sampling resistor R4 ＇ other end ground connection, resistance R3 two ends connect the transformation of pwm signal output
Device secondary；Series resistor R1 and sampling resistor R1 ＇ between relay S1 and ground, between relay S2 and ground series resistor R2 and
Sampling resistor R2 ＇.
Relay S3 and variable resistor R5, dc bus negative pole end it is serially connected with between described dc bus positive terminal and ground
And it is serially connected with relay S4 and variable resistor R6 between ground；Described insulation detecting circuit also includes control relay S3, a S4's
The control panel of the resistance of switch and regulation variable resistor R5, R6；Described sampling resistor R1 ＇, R2 ＇, R3 ＇ and R4 ＇ are connected to
Measure the voltage measurement plate one of respective voltage, voltage measurement plate three, voltage measurement plate two and voltage measurement plate four；Described control panel
With voltage measurement plate one, voltage measurement plate two, voltage measurement plate three and voltage measurement plate four, connected by CAN respectively
Position machine.
Preferably, described battery management system, also include that the voltage being respectively used to gather the magnitude of voltage of each sampling resistor is adopted
Collection module, and calculate battery pack dc bus positive and negative electrode insulaion resistance R over the ground according to the magnitude of voltage of the sampling resistor recorded
+ and the main control circuit of resistance of R-.
Preferably, described main control circuit includes eprom memory.
A kind of calibration steps of the insulation detecting circuit with calibration module, including step:
(1) first when disconnecting pwm signal, the calibration parameter of sampling resistor R1 ＇ voltage, relay S1, S2, S3 and S4 are asked
All closing, parametric calibration equation is:
U=Aχ+B……①
Wherein: the magnitude of voltage that the sampling resistor R1 ＇ reality of gained is got measured by U voltage measurement plate one；
A voltage correction factor；
The AD value of the voltage that the sampling resistor R1 ＇ that the voltage acquisition module of χ battery management system is gathered is got；
B voltage drift amount；
Connect circuit according to above-mentioned requirements, record class value U1 and x1, be sent to host computer by CAN and preserve；
After first class value is measured and preserved, host computer sends the order of regulation variable resistor R5, R6 resistance to control panel, adjusts variable resistor
R5, R6 resistance, obtains another class value U2 and x2, is sent to host computer by CAN and preserves；By above-mentioned two class value substitution sides
Journey 1. in, two equations simultaneousnesses, thus try to achieve the value of corrected parameter A, B of sampling resistor R1 ＇ voltage, if follow-up voltage acquisition
What module was real-time substitute into the AD value that detects equation 1. in, and A, B value substitution equation tried to achieve 1. in, so that it may try to achieve sampling
The magnitude of voltage at resistance R1 ＇ two ends.
(2) when inputting pwm signal, the calibration parameter of sampling resistor R1 ＇ voltage is sought, relay S1, S3 and S4 are closed,
S2 disconnects:
Same step (1), by regulating the value of variable resistor R5 and R6, obtains the value of two groups of U and χ, substitutes into equation 1., i.e. ask
Must there is calibration parameter A of sampling resistor R1 ＇ both end voltage, the value of B in the case of input pwm signal.
(3) when inputting pwm signal, seek the calibration parameter of sampling resistor R3 ＇ voltage, relay S1, S3 and S4 are closed
Close, S2 disconnects:
At this moment measured, by voltage measurement plate two, the magnitude of voltage that sampling resistor R3 ＇ reality is got；Same step (1), by adjusting
The value of joint variable resistor R5 and R6, obtains the value of two groups of U and x, substitutes into equation 1., solves when inputting pwm signal, sampling resistor
Calibration parameter A of R3 ＇ voltage, the value of B；
(4) when inputting without pwm signal, the calibration parameter of sampling resistor R2 ＇ both end voltage, relay S1, S2, S3 are asked
All close with S4:
At this moment measured, by voltage measurement plate three, the magnitude of voltage that sampling resistor R2 ＇ reality is got；Same step (1), by adjusting
The value of joint variable resistor R5 and R6, obtains the value of two groups of U and x, substitutes into equation 1., solves when inputting without pwm signal, sampling electricity
Resistance calibration parameter A of R2 ＇ voltage, the value of B；
(5) when there being pwm signal to input, the calibration parameter of sampling resistor R2 ＇ both end voltage, relay S2, S3 and S4 are asked
Guan Bi, S1 disconnects:
At this moment measured, by voltage measurement plate three, the magnitude of voltage that sampling resistor R2 ＇ reality is got；Same step (1), by adjusting
The value of joint variable resistor R5 and R6, obtains the value of two groups of U and x, substitutes into equation 1., solves when there being pwm signal to input, sampling electricity
Resistance calibration parameter A of R2 ＇ voltage, the value of B；
(6) when there being pwm signal to input, the calibration parameter of sampling resistor R4 ＇ both end voltage, relay S2, S3 and S4 are asked
Guan Bi, S1 disconnects:
At this moment measured, by voltage measurement plate four, the magnitude of voltage that sampling resistor R4 ＇ reality is got；Same step (1), by adjusting
The value of joint variable resistor R5 and R6, obtains the value of two groups of U and x, substitutes into equation 1., solves when there being pwm signal to input, sampling electricity
Resistance calibration parameter A of R4 ＇ voltage, the value of B；
Host computer is sent to battery management system the above-mentioned 6 groups of calibration parameters calculated, and battery management system is calibration
In parameter read-in EPROM, calibrate complete.
Insulation detecting circuit with calibration module of the present invention and calibration steps thereof are according to equation U=A χ+B, logical
Overregulate the value of variable resistor R5 and R6, obtain the value of two groups of U and χ, substitute into equation, i.e. try to achieve the school of sampling resistor both end voltage
Quasi-parameter A, the value of B, it is achieved parametric calibration, and by host computer, the above-mentioned 6 groups of calibration parameters calculated are sent to cell tube
In the EPROM of reason system；If the real-time AD value detected and A, B value are substituted in equation of follow-up voltage acquisition module, and
The substitution equation tried to achieve 1. in, so that it may try to achieve the magnitude of voltage at sampling resistor two ends.Insulation inspection is improve by the calibration of parameter
The accuracy of four sampling resistor voltages of slowdown monitoring circuit, when circuit parameter changes, can improve the precision of Insulation monitoring.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the insulation detecting circuit disclosed in the patent application of Application No. 201110264050.7；
Fig. 2 is the embodiment schematic diagram of the insulation detecting circuit with calibration module of the present invention.
Detailed description of the invention
Understand the technology contents of the present invention for convenience of those skilled in the art, below in conjunction with embodiment the present invention done into
The detailed description of one step.
As in figure 2 it is shown, the disclosed insulation detecting circuit with calibration module for battery management system,
Regard car body as ground, battery pack dc bus positive and negative electrode insulaion resistance over the ground is respectively R+ and R-；By dc bus positive terminal
It is sequentially connected in series relay S1, the negative pole of diode D1, resistance R3 and sampling resistor R3 ＇, sampling resistor R3 ＇ other end ground connection, electricity
Resistance R3 two ends connect pwm signal output by transformer；Dc bus negative pole is sequentially connected in series relay S2, diode D2
Positive pole, resistance R4 and sampling resistor R4 ＇, sampling resistor R4 ＇ other end ground connection, resistance R3 two ends connect PWM by transformer and believe
Number output；Series resistor R1 and sampling resistor R1 ＇, series resistor R2 between relay S2 and ground between relay S1 and ground
With sampling resistor R2 ＇.Described battery management system, also includes the voltage acquisition being respectively used to gather the magnitude of voltage of each sampling resistor
Module, and calculate battery pack dc bus positive and negative electrode insulaion resistance R+ over the ground according to the magnitude of voltage of the sampling resistor recorded
Main control circuit with the resistance of R-.Described main control circuit includes eprom memory.
First control relay S1 and relay S2 Guan Bi, and the pwm signal of resistance R3, R4 does not inputs, if battery pack is total
Voltage is respectively U+, U-in resistance R+ and R-institute component voltage；By the voltage signal on resistance R1 ＇ and R2 ＇ is sampled
Converse the voltage on R+ and R-；According to the size of voltage on R+ and R-, it can be deduced that the proportionate relationship of R+ and R-, if
This relational expression is formula one；
Control relay S1 Guan Bi again, relay S2 disconnects, and resistance R3 inputs pwm signal, and resistance R4 does not input PWM letter
Number, then the voltage of assembled battery total voltage and resistance R3 is simultaneously injected into the circuit loop of resistance R+, R-, R1, R1 ＇ composition；To electricity
Voltage on resistance R1 ＇, R3 ＇ is sampled, and according to Kirchhoff's current law (KCL), formulation two, then according to formula two and formula
One obtains R+；
Control relay S2 Guan Bi again, relay S1 disconnects, and resistance R3 does not input pwm signal, resistance R4 input PWM letter
Number, then the voltage that assembled battery total voltage and dc source two export is simultaneously injected into the circuit of resistance R+, R-, R2, R2 ＇ composition and returns
Lu Zhong；Voltage signal on resistance R2 ＇ and resistance R4 ＇ is sampled, according to Kirchhoff's current law (KCL), formulation three,
Then obtain R-according to formula three and formula one.
Relay S3 and variable resistor R5, dc bus negative pole end it is serially connected with between described dc bus positive terminal and ground
And it is serially connected with relay S4 and variable resistor R6 between ground；Described insulation detecting circuit also includes control relay S3, a S4's
The control panel of the resistance of switch and regulation variable resistor R5, R6；Described sampling resistor R1 ＇, R2 ＇, R3 ＇ and R4 ＇ are connected to
Measure the voltage measurement plate one of respective voltage, voltage measurement plate three, voltage measurement plate two and voltage measurement plate four；Described control panel
With voltage measurement plate one, voltage measurement plate two, voltage measurement plate three and voltage measurement plate four, connected by CAN respectively
Position machine.
A kind of calibration steps of the insulation detecting circuit with calibration module, including step:
(1) first when disconnecting pwm signal, the calibration parameter of sampling resistor R1 ＇ voltage, relay S1, S2, S3 and S4 are asked
All closing, parametric calibration equation is:
U=Aχ+B……①
Wherein: the magnitude of voltage that the sampling resistor R1 ＇ reality of gained is got measured by U voltage measurement plate one；
A voltage correction factor；
The AD value of the voltage that the sampling resistor R1 ＇ that the voltage acquisition module of χ battery management system is gathered is got；
B voltage drift amount；
Connect circuit according to above-mentioned requirements, record class value U1 and x1, be sent to host computer by CAN and preserve；
After first class value is measured and preserved, host computer sends the order of regulation variable resistor R5, R6 resistance to control panel, adjusts variable resistor
R5, R6 resistance, obtains another class value U2 and x2, is sent to host computer by CAN and preserves；By above-mentioned two class value substitution sides
Journey 1. in, two equations simultaneousnesses, thus try to achieve the value of corrected parameter A, B of sampling resistor R1 ＇ voltage, if follow-up voltage acquisition
What module was real-time substitute into the AD value that detects equation 1. in, and A, B value substitution equation tried to achieve 1. in, so that it may try to achieve sampling
The magnitude of voltage at resistance R1 ＇ two ends.
(2) when inputting pwm signal, the calibration parameter of sampling resistor R1 ＇ voltage is sought, relay S1, S3 and S4 are closed,
S2 disconnects:
Same step (1), by regulating the value of variable resistor R5 and R6, obtains the value of two groups of U and χ, substitutes into equation 1., i.e. ask
Must there is calibration parameter A of sampling resistor R1 ＇ both end voltage, the value of B in the case of input pwm signal.
(3) when inputting pwm signal, seek the calibration parameter of sampling resistor R3 ＇ voltage, relay S1, S3 and S4 are closed
Close, S2 disconnects: what equivalent circuit is？
At this moment measured, by voltage measurement plate two, the magnitude of voltage that sampling resistor R3 ＇ reality is got；Same step (1), by adjusting
The value of joint variable resistor R5 and R6, obtains the value of two groups of U and x, substitutes into equation 1., solves when inputting pwm signal, sampling resistor
Calibration parameter A of R3 ＇ voltage, the value of B；
(4) when inputting without pwm signal, the calibration parameter of sampling resistor R2 ＇ both end voltage, relay S1, S2, S3 are asked
All close with S4:
At this moment measured, by voltage measurement plate three, the magnitude of voltage that sampling resistor R2 ＇ reality is got；Same step (1), by adjusting
The value of joint variable resistor R5 and R6, obtains the value of two groups of U and x, substitutes into equation 1., solves when inputting without pwm signal, sampling electricity
Resistance calibration parameter A of R2 ＇ voltage, the value of B；
(5) when there being pwm signal to input, the calibration parameter of sampling resistor R2 ＇ both end voltage, relay S2, S3 and S4 are asked
Guan Bi, S1 disconnects:
At this moment measured, by voltage measurement plate three, the magnitude of voltage that sampling resistor R2 ＇ reality is got；Same step (1), by adjusting
The value of joint variable resistor R5 and R6, obtains the value of two groups of U and x, substitutes into equation 1., solves when there being pwm signal to input, sampling electricity
Resistance calibration parameter A of R2 ＇ voltage, the value of B；
(6) when there being pwm signal to input, the calibration parameter of sampling resistor R4 ＇ both end voltage, relay S2, S3 and S4 are asked
Guan Bi, S1 disconnects:
At this moment measured, by voltage measurement plate four, the magnitude of voltage that sampling resistor R4 ＇ reality is got；Same step (1), by adjusting
The value of joint variable resistor R5 and R6, obtains the value of two groups of U and x, substitutes into equation 1., solves when there being pwm signal to input, sampling electricity
Resistance calibration parameter A of R4 ＇ voltage, the value of B；
Host computer is sent to battery management system the above-mentioned 6 groups of calibration parameters calculated, and battery management system is calibration
In parameter read-in EPROM, calibrate complete.
Above-described embodiment is only the wherein specific implementation of the present invention, and it describes more concrete and detailed, but can not
Therefore the restriction to the scope of the claims of the present invention it is interpreted as.It should be pointed out that, for the person of ordinary skill of the art,
Without departing from the inventive concept of the premise, it is also possible to make some deformation and improvement, these obvious alternative forms are equal
Belong to protection scope of the present invention.
Claims (1)
1. the calibration steps with the insulation detecting circuit of calibration module, it is characterised in that include with calibration module
Insulation detecting circuit, for battery management system, described insulation detecting circuit, regard car body as ground, battery pack dc bus is positive and negative
Pole insulaion resistance over the ground is respectively R+ and R-；Dc bus positive terminal is sequentially connected in series relay S1, diode D1 negative
Pole, resistance R3 and sampling resistor R3 ＇, sampling resistor R3 ＇ other end ground connection, resistance R3 two ends connect pwm signal by transformer
Output；Dc bus negative pole is sequentially connected in series relay S2, the positive pole of diode D2, resistance R4 and sampling resistor R4 ＇, sampling
Resistance R4 ＇ other end ground connection, resistance R4 two ends connect the transformer secondary of pwm signal output；Concatenate between relay S1 and ground
Resistance R1 and sampling resistor R1 ＇, series resistor R2 and sampling resistor R2 ＇ between relay S2 and ground；Described dc bus is just
Extremely and it is serially connected with relay S3 and variable resistor R5 between ground, between dc bus negative pole end and ground, is serially connected with relay S4
With variable resistor R6；Described insulation detecting circuit also includes switch and regulation variable resistor R5, R6 of control relay S3, a S4
The control panel of resistance；Described sampling resistor R1 ＇, R2 ＇, R3 ＇ and R4 ＇ are connected to measure the voltage measurement plate of respective voltage
One, voltage measurement plate three, voltage measurement plate two and voltage measurement plate four；Described control panel and voltage measurement plate one, voltage measurement
Plate two, voltage measurement plate three and voltage measurement plate four, connect host computer by CAN respectively；
Calibration steps includes step:
(1) first when disconnecting pwm signal, seeking the calibration parameter of sampling resistor R1 ＇ voltage, relay S1, S2, S3 and S4 all close
Closing, parametric calibration equation is:
U=Aχ+B……①
Wherein: the magnitude of voltage that the sampling resistor R1 ＇ reality of gained is got measured by U voltage measurement plate one；
A voltage correction factor；
The AD value of the voltage that the sampling resistor R1 ＇ that the voltage acquisition module of χ battery management system is gathered is got；
B voltage drift amount；
Connect circuit, record class value U1 and x1, be sent to host computer by CAN and preserve；First class value is measured and is protected
After depositing, host computer sends the order of regulation variable resistor R5, R6 resistance to control panel, adjusts variable resistor R5, R6 resistance, obtains another
One class value U2 and x2, is sent to host computer by CAN and preserves；By above-mentioned two class values substitute into equations 1. in, two equations
Simultaneous, thus try to achieve the value of corrected parameter A, B of sampling resistor R1 ＇ voltage, if the inspection that follow-up voltage acquisition module is real-time
The AD value that measures substitute into equation 1. in, and A, B value substitution equation tried to achieve 1. in, so that it may try to achieve sampling resistor R1 ＇ two ends
Magnitude of voltage；
(2) when inputting pwm signal, seek the calibration parameter of sampling resistor R1 ＇ voltage, relay S1, S3 and S4 Guan Bi, S2 are broken
Open:
Same step (1), by regulating the value of variable resistor R5 and R6, obtains the value of two groups of U and χ, substitutes into equation 1., i.e. tried to achieve
Calibration parameter A of sampling resistor R1 ＇ both end voltage, the value of B in the case of input pwm signal；
(3) when inputting pwm signal, the calibration parameter of sampling resistor R3 ＇ voltage is sought, by relay S1, S3 and S4 Guan Bi, S2
Disconnect:
At this moment measured, by voltage measurement plate two, the magnitude of voltage that sampling resistor R3 ＇ reality is got；Same step (1), can by regulation
The value of power transformation resistance R5 and R6, obtains the value of two groups of U and x, substitutes into equation 1., solves when inputting pwm signal, sampling resistor R3 ＇
Calibration parameter A of voltage, the value of B；
(4) when inputting without pwm signal, the calibration parameter of sampling resistor R2 ＇ both end voltage, relay S1, S2, S3 and S4 are asked
All Guan Bis:
At this moment measured, by voltage measurement plate three, the magnitude of voltage that sampling resistor R2 ＇ reality is got；Same step (1), can by regulation
The value of power transformation resistance R5 and R6, obtains the value of two groups of U and x, substitutes into equation 1., solve when inputting without pwm signal, sampling resistor
Calibration parameter A of R2 ＇ voltage, the value of B；
(5) when there being pwm signal to input, seeking the calibration parameter of sampling resistor R2 ＇ both end voltage, relay S2, S3 and S4 close
Closing, S1 disconnects:
At this moment measured, by voltage measurement plate three, the magnitude of voltage that sampling resistor R2 ＇ reality is got；Same step (1), can by regulation
The value of power transformation resistance R5 and R6, obtains the value of two groups of U and x, substitutes into equation 1., solve when there being pwm signal to input, sampling resistor
Calibration parameter A of R2 ＇ voltage, the value of B；
(6) when there being pwm signal to input, seeking the calibration parameter of sampling resistor R4 ＇ both end voltage, relay S2, S3 and S4 close
Closing, S1 disconnects:
At this moment measured, by voltage measurement plate four, the magnitude of voltage that sampling resistor R4 ＇ reality is got；Same step (1), can by regulation
The value of power transformation resistance R5 and R6, obtains the value of two groups of U and x, substitutes into equation 1., solve when there being pwm signal to input, sampling resistor
Calibration parameter A of R4 ＇ voltage, the value of B；
Host computer is sent to battery management system the above-mentioned 6 groups of calibration parameters calculated, and battery management system is calibration parameter
In write EPROM, calibrate complete.
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| CN108680793B (en) * | 2018-07-10 | 2023-04-28 | 天津职业技术师范大学 | Insulation resistance detection circuit and detection method for pure electric vehicle |
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| CN113189463A (en) * | 2021-04-15 | 2021-07-30 | 常州易控汽车电子股份有限公司 | Vehicle insulation detection circuit |
| CN113884931B (en) * | 2021-10-28 | 2023-06-23 | 傲普(上海)新能源有限公司 | Time drift compensation method of BMS system |
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