CN102565743A - Voltage automatic calibration device - Google Patents
Voltage automatic calibration device Download PDFInfo
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- CN102565743A CN102565743A CN2012100116600A CN201210011660A CN102565743A CN 102565743 A CN102565743 A CN 102565743A CN 2012100116600 A CN2012100116600 A CN 2012100116600A CN 201210011660 A CN201210011660 A CN 201210011660A CN 102565743 A CN102565743 A CN 102565743A
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Abstract
The invention discloses a voltage automatic calibration device, which includes a high precision voltage reference source, multichannel transfer relays, a voltage acquisition module and a single chip control unit, wherein one end of each of the channel transfer relays is respectively connected with the high precision voltage reference source, the other end of each of the channel transfer relays is connected with each of voltage acquisition channels of the voltage acquisition module respectively, the single chip control unit is connected with a control end of each of the channel transfer relays and is connected with the voltage acquisition module through a controller area network (CAN) bus, thereby obtaining channel acquisition voltage of the voltage acquisition module and finishing the calculation of voltage calibration value. The single chip control unit performs voltage calibration on the voltage acquisition module through the CAN bus. Without manual operation, the voltage automatic calibration device avoids battery voltage discretization errors and personal errors, and can guarantee that voltage acquisition precision is promoted from 10 m V to 2 m V.
Description
Technical field
The present invention relates to battery management system (BMS) technical field, be specifically related to the voltage self-checking device of a kind of battery management system (BMS).
Background technology
Battery management system (BMS) voltage acquisition module is wanted the voltage of hundreds and thousands of cells of real-time acquisition monitoring, and the acquisition precision of monomer voltage is directly determining real-time and the validity of BMS to battery protection.The integrated chip acquisition scheme of industry employing at present and discrete component acquisition scheme all exist because the intrinsic inconsistency of circuit causes the voltage imbalance, finally cause the deviation of voltage acquisition big.Need calibrate the voltage acquisition function of voltage acquisition module before dispatching from the factory.
Conventional calibration method is following: connect voltage acquisition module and gather winding displacement to battery strings; Write down the monomer voltage that each passage is gathered; Measure each monomer voltage successively with the high precision multimeter; And calculate the difference of each passage collection value and high precision multimeter measured value, choose intermediate value voltage acquisition module is calibrated.This method is overly dependent upon manually-operated; Complex steps; Restricting the batch process of voltage acquisition module, exist simultaneously the discrete difference of cell voltage and since manual measurement with calculate the possibility that carelessness causes final calibration value mistake, the acquisition precision of assurance voltage acquisition module that can not be real.
Summary of the invention
The deficiency that the present invention is directed to existing calibration steps has proposed a kind of full-automatic calibration program based on frock, and true battery is simulated in one road high-precision voltage reference source of adopting, through switching multicircuit relay successively to respective channel; Accomplish the voltage acquisition of all passages, voltage acquisition module is uploaded to the Single-chip Controlling unit to information of voltage through the CAN bus, and the Single-chip Controlling unit carries out error ratio and data processing; Calculate calibration value; Be sent to voltage acquisition module through the CAN bus, finally accomplish voltage calibration, need not manually-operated; Avoid cell voltage discretization error and personal error, can guarantee that the voltage acquisition precision is promoted to 2mV from 10mV.
Technical scheme of the present invention is following:
A kind of voltage self-checking device; Include high-precision voltage reference source, multiplexer channel transfer relay, voltage acquisition module and Single-chip Controlling unit; It is characterized in that: an end of every paths transfer relay links to each other with the high-precision voltage reference source respectively; The other end of every paths transfer relay links to each other with each voltage acquisition passage of voltage acquisition module respectively, and said Single-chip Controlling unit links to each other with the control end of every paths transfer relay, the switching of Single-chip Controlling unit controls multiplexer channel transfer relay; The Single-chip Controlling unit links to each other with voltage acquisition module through the CAN bus; Obtain the passage of voltage acquisition module and gather voltage, accomplish calculating, and voltage acquisition module is carried out voltage calibration through the CAN bus to the voltage calibration value;
When the trigger voltage automatic calibration function; The adhesive of first via passage transfer relay is at first controlled in the Single-chip Controlling unit; Make the first voltage acquisition passage and the conducting of high precision reference source of voltage acquisition module; Through the CAN bus request and obtain the voltage acquisition value of the voltage acquisition module first voltage acquisition passage, Single-chip Controlling unit controls first via passage transfer relay breaks off then, simultaneously the closed second paths transfer relay then; Make the second voltage acquisition passage and the conducting of high precision reference source of voltage acquisition module, then through the CAN bus request and obtain the voltage acquisition value of the voltage acquisition module second voltage acquisition passage; And the like, to accomplish the obtaining of the voltage acquisition value of all voltage acquisition passages of voltage acquisition module until the Single-chip Controlling unit, last all passage transfer relays of Single-chip Controlling unit controls break off;
The Single-chip Controlling unit calculates the collection magnitude of voltage of every paths and the difference of actual value successively, draws the difference ordered series of numbers, obtains the nothing skew estimated value of the minimum variance of difference ordered series of numbers then, is final voltage calibration value;
After the Single-chip Controlling unit calculates the voltage calibration value; Through the CAN bus voltage calibration value is sent to voltage acquisition module; After said voltage acquisition module received and preserve the completion of voltage calibration value, response instruction to the voltage of return voltage calibration value configuration successful was calibrated frock automatically, and later voltage acquisition module is at every turn all gathering the summation of magnitude of voltage and voltage calibration value; Participate in data computation and state judgement as final collection magnitude of voltage, the voltage acquisition module voltage calibration is accomplished.
Described a kind of voltage self-checking device is characterized in that: said high-precision voltage reference source is made up of 2.5V voltage stabilizing chip and peripheral circuit thereof, and the output voltage nominal accuracy in high-precision voltage reference source is 1mV, and has temperature compensation function.
With original compared with techniques, beneficial effect of the present invention is embodied in:
(1), the present invention introduces high precision reference source simulation multi-string battery, accomplishes the plurality of voltages collection through relay switching channel successively, overcome the fluctuation and the discrete difference of cell voltage, consistance is higher;
(2), frock and voltage acquisition module are through the mode of bus communication; Mutual voltage acquisition information and calibration value, and calibration value comes from the Single-chip Controlling unit and calculates automatically, avoided personal error and loaded down with trivial details manually-operated; Improve the voltage sample precision, developed the yield-power of product.
Description of drawings
Fig. 1 is apparatus of the present invention schematic diagram.
Embodiment
Referring to Fig. 1, a kind of voltage self-checking device includes high-precision voltage reference source, multiplexer channel transfer relay, voltage acquisition module and Single-chip Controlling unit; The high-precision voltage reference source is made up of 2.5V voltage stabilizing chip and peripheral circuit thereof; The output voltage nominal accuracy in high-precision voltage reference source is 1mV, and has temperature compensation function, and the voltage drift within other 5 ℃ can be ignored; One end of every paths transfer relay links to each other with the high-precision voltage reference source respectively; The other end of every paths transfer relay links to each other with each voltage acquisition passage of voltage acquisition module respectively, and the Single-chip Controlling unit links to each other with the control end of every paths transfer relay, the switching of Single-chip Controlling unit controls multiplexer channel transfer relay; The Single-chip Controlling unit links to each other with voltage acquisition module through the CAN bus; Obtain the passage of voltage acquisition module and gather voltage, accomplish calculating, and voltage acquisition module is carried out voltage calibration through the CAN bus to the voltage calibration value;
When the trigger voltage automatic calibration function; The adhesive of first via passage transfer relay is at first controlled in the Single-chip Controlling unit; Make the first voltage acquisition passage and the conducting of high precision reference source of voltage acquisition module; Through the CAN bus request and obtain the voltage acquisition value of the voltage acquisition module first voltage acquisition passage, Single-chip Controlling unit controls first via passage transfer relay breaks off then, simultaneously the closed second paths transfer relay then; Make the second voltage acquisition passage and the conducting of high precision reference source of voltage acquisition module, then through the CAN bus request and obtain the voltage acquisition value of the voltage acquisition module second voltage acquisition passage; And the like, to accomplish the obtaining of the voltage acquisition value of all voltage acquisition passages of voltage acquisition module until the Single-chip Controlling unit, last all passage transfer relays of Single-chip Controlling unit controls break off;
The Single-chip Controlling unit calculates the collection magnitude of voltage of every paths and the difference of actual value successively, draws the difference ordered series of numbers, obtains the nothing skew estimated value of the minimum variance of difference ordered series of numbers then, is final voltage calibration value;
After the Single-chip Controlling unit calculates the voltage calibration value; Through the CAN bus voltage calibration value is sent to voltage acquisition module; After voltage acquisition module received and preserve the completion of voltage calibration value, response instruction to the voltage of return voltage calibration value configuration successful was calibrated frock automatically, and later voltage acquisition module is at every turn all gathering the summation of magnitude of voltage and voltage calibration value; Participate in data computation and state judgement as final collection magnitude of voltage, the voltage acquisition module voltage calibration is accomplished.
Below in conjunction with accompanying drawing concrete implementation procedure of the present invention is described:
At first voltage detecting winding displacement and the CAN order wire with voltage detection module to be calibrated docks with the voltage self-checking device, after screen displaying communication is normal, clicks touch-screen and calibrates start button automatically, and automatic calibration function begins.
The Single-chip Controlling unit is pilot relay K1+ and K1-closure at first, makes voltage acquisition module the 1st acquisition channel to be checked and the conducting of high precision reference source.Time-delay is after 50ms treats system stability, and the Single-chip Controlling unit sends the information of voltage request instruction through the CAN bus and gives voltage detection module to be checked, receive the 1 road voltage acquisition data V1 after, the temporary transient preservation.
Single-chip Controlling unit controls relay K 1+ and K1-break off, and then pilot relay K2+ and K2-are closed, make voltage acquisition module the 2nd acquisition channel to be checked and the conducting of high precision reference source.Time-delay is after 50ms treats system stability, and the Single-chip Controlling unit sends the information of voltage request instruction through the CAN bus and gives voltage detection module to be checked, receive the 2 road voltage acquisition data V2 after, the temporary transient preservation.
After obtaining all voltage acquisition data successively, the Single-chip Controlling unit breaks off all relays, with each element of voltage acquisition data array { V1; V2 ... VN} does poorly with actual value V successively, draws difference ordered series of numbers { V1-V; V2-V ... VN-V} is according to mathematical statistics knowledge; Obtain minimum variance unbiased and move estimated value (being the voltage calibration value), be sent to voltage acquisition module to be detected through the CAN bus.
After voltage was calibrated the voltage calibration value configuration successful message that frock receives voltage acquisition module to be checked response automatically, prompting voltage was calibrated completion automatically on touch-screen, and the display voltage calibration value.
Claims (2)
1. voltage self-checking device; Include high-precision voltage reference source, multiplexer channel transfer relay, voltage acquisition module and Single-chip Controlling unit; It is characterized in that: an end of every paths transfer relay links to each other with the high-precision voltage reference source respectively; The other end of every paths transfer relay links to each other with each voltage acquisition passage of voltage acquisition module respectively, and said Single-chip Controlling unit links to each other with the control end of every paths transfer relay, the switching of control multiplexer channel transfer relay; The Single-chip Controlling unit links to each other with voltage acquisition module through the CAN bus; Obtain the passage of voltage acquisition module and gather voltage, accomplish calculating, and voltage acquisition module is carried out voltage calibration through the CAN bus to the voltage calibration value;
When the trigger voltage automatic calibration function; The adhesive of first via passage transfer relay is at first controlled in the Single-chip Controlling unit; Make the first voltage acquisition passage and the conducting of high precision reference source of voltage acquisition module; Through the CAN bus request and obtain the voltage acquisition value of the voltage acquisition module first voltage acquisition passage, Single-chip Controlling unit controls first via passage transfer relay breaks off then, simultaneously the closed second paths transfer relay then; Make the second voltage acquisition passage and the conducting of high precision reference source of voltage acquisition module, then through the CAN bus request and obtain the voltage acquisition value of the voltage acquisition module second voltage acquisition passage; And the like, to accomplish the obtaining of the voltage acquisition value of all voltage acquisition passages of voltage acquisition module until the Single-chip Controlling unit, last all passage transfer relays of Single-chip Controlling unit controls break off;
The Single-chip Controlling unit calculates the collection magnitude of voltage of every paths and the difference of actual value successively, draws the difference ordered series of numbers, obtains the nothing skew estimated value of the minimum variance of difference ordered series of numbers then, is the voltage calibration value;
After the Single-chip Controlling unit calculates the voltage calibration value; Through the CAN bus voltage calibration value is sent to voltage acquisition module; After said voltage acquisition module received and preserve the completion of voltage calibration value, response instruction to the voltage of return voltage calibration value configuration successful was calibrated frock automatically, and later voltage acquisition module is at every turn all gathering the summation of magnitude of voltage and voltage calibration value; Participate in data computation and state judgement as final collection magnitude of voltage, the voltage acquisition module voltage calibration is accomplished.
2. a kind of voltage self-checking device according to claim 1; It is characterized in that: said high-precision voltage reference source is made up of 2.5V voltage stabilizing chip and peripheral circuit thereof; The output voltage nominal accuracy in high-precision voltage reference source is 1mV, and has temperature compensation function.
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| CN2012100116600A CN102565743A (en) | 2012-01-16 | 2012-01-16 | Voltage automatic calibration device |
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| CN2012100116600A CN102565743A (en) | 2012-01-16 | 2012-01-16 | Voltage automatic calibration device |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103698691A (en) * | 2013-12-27 | 2014-04-02 | 珠海银隆电器有限公司 | Automatic detection calibration device and automatic detection calibration method of electric car bridge board |
| CN104459390A (en) * | 2014-11-28 | 2015-03-25 | 深圳市盛弘电气有限公司 | Method and system for calibrating voltage and current of battery management device |
| CN105319522A (en) * | 2015-06-11 | 2016-02-10 | 江苏茶花电气有限公司 | Subway inverter box sensor online detection device |
| CN106405460A (en) * | 2016-07-06 | 2017-02-15 | 广州维思车用部件有限公司 | Electronic instrument voltage detection calibration system and calibration method |
| CN106771542A (en) * | 2016-12-29 | 2017-05-31 | 深圳市科陆电子科技股份有限公司 | A kind of battery voltage acquisition calibrates circuit |
| CN107305239A (en) * | 2016-04-22 | 2017-10-31 | 宝沃汽车（中国）有限公司 | Battery core monomer voltage amendment circuit, method, battery management system and automobile |
| CN107860953A (en) * | 2017-12-18 | 2018-03-30 | 珠海格力电器股份有限公司 | Three-phase electric energy metering module and calibration method thereof |
| CN109975731A (en) * | 2018-12-28 | 2019-07-05 | 北京航天测控技术有限公司 | A kind of measuring system based on real time calibration |
| CN110174635A (en) * | 2019-06-28 | 2019-08-27 | 蜂巢能源科技有限公司 | High pressure sampling plate calibration system and method |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105319522A (en) * | 2015-06-11 | 2016-02-10 | 江苏茶花电气有限公司 | Subway inverter box sensor online detection device |
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| CN106771542B (en) * | 2016-12-29 | 2019-08-13 | 深圳市科陆电子科技股份有限公司 | A kind of battery voltage acquisition calibration circuit |
| CN107860953A (en) * | 2017-12-18 | 2018-03-30 | 珠海格力电器股份有限公司 | Three-phase electric energy metering module and calibration method thereof |
| CN107860953B (en) * | 2017-12-18 | 2019-12-24 | 珠海格力电器股份有限公司 | Three-phase electric energy metering module and calibration method thereof |
| CN109975731A (en) * | 2018-12-28 | 2019-07-05 | 北京航天测控技术有限公司 | A kind of measuring system based on real time calibration |
| CN110174635A (en) * | 2019-06-28 | 2019-08-27 | 蜂巢能源科技有限公司 | High pressure sampling plate calibration system and method |
| CN110174635B (en) * | 2019-06-28 | 2021-08-31 | 蜂巢能源科技有限公司 | High-voltage sampling plate calibration system and method |
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Application publication date: 20120711 |
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