CN108802654A - A kind of the automatic Calibration acquisition system and method for forming and capacity dividing test power supply - Google Patents

A kind of the automatic Calibration acquisition system and method for forming and capacity dividing test power supply Download PDF

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Publication number
CN108802654A
CN108802654A CN201810739459.1A CN201810739459A CN108802654A CN 108802654 A CN108802654 A CN 108802654A CN 201810739459 A CN201810739459 A CN 201810739459A CN 108802654 A CN108802654 A CN 108802654A
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power supply
test power
acquisition
calibration
channel
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CN108802654B (en
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兰欣
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Shandong University
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Shandong University
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00Testing or calibrating of apparatus covered by the other groups of this subclass
    • G01R35/005Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references

Abstract

The invention discloses automatic Calibration acquisition systems and method that a kind of forming and capacity dividing tests power supply, including calibration facility, needle bed and test power supply client, and the calibration facility includes control unit, data acquisition unit and data processing unit;Described control unit is configured as sending sampling work step flow to test power supply client;The data acquisition unit is controlled according to client instructions, current/voltage acquisition is carried out to each channel for testing power supply successively, obtain the current/voltage actual value in each channel;Receive the current/voltage measuring value and setting value in each channel that test power supply client is sent;It controls the data processing unit and carries out new calibration coefficient calculating, and new calibration coefficient is sent to test power supply client;The needle bed is configured as making acquisition action according to client instructions, calibration facility is made to enter sample states;The test power supply client is configured as executing operational order according to sampling work step flow, completes the precision calibration of test power supply.

Description

A kind of the automatic Calibration acquisition system and method for forming and capacity dividing test power supply
Technical field
The present invention relates to power battery or ultracapacitor fields, and in particular to a kind of forming and capacity dividing test power supply it is automatic Demarcate acquisition system and method.
Background technology
With the fast development of China's economic society and new energy industry, power battery or ultracapacitor are widely used in Electric Transit, electric vehicle, massive energy storage system etc..Power battery or ultracapacitor often need during production It is detected, detection device therefor generally use forming and capacity dividing tests power supply.Forming and capacity dividing tests power supply due to electronics Component aging and temperature influence be easy to cause measuring accuracy decline, and charge and discharge behaviour is being carried out to power battery or ultracapacitor When making, the measuring accuracy of power battery or ultracapacitor is caused to decline, therefore, when forming and capacity dividing tests power supply accuracy decline Test data should be acquired in real time, and is re-scaled to it.
However, the calibration of existing forming and capacity dividing test power supply is all completed before manufacture, the calibration after manufacture Journey is comparatively laborious and less efficient, needs professional to demarcate and examine it, the degree of automation is low.
Therefore, the new skill that power data carries out automatic collection correction can be tested to forming and capacity dividing there is an urgent need to develop a kind of Art.
Invention content
In order to solve the deficiencies in the prior art, the present invention provides the automatic Calibration acquisitions that a kind of forming and capacity dividing tests power supply System and method, the data which can test forming and capacity dividing power supply carry out automatic collection and correction, improve test power supply Precision.
To achieve the goals above, technical scheme is as follows:
A kind of automatic Calibration acquisition system of forming and capacity dividing test power supply, including calibration facility, needle bed and test power supply visitor Family end, the calibration facility include control unit, storage unit, data acquisition unit and data processing unit;
Described control unit is configured as sending sampling work step flow to test power supply client;With
The data acquisition unit is controlled according to client instructions, and electric current/electricity is carried out to each channel for testing power supply successively Pressure acquisition, obtains the current/voltage actual value in each channel;With
Receive the current/voltage measuring value and setting value in each channel that test power supply client is sent;With
It controls the data processing unit and carries out new calibration coefficient calculating, and new calibration coefficient is sent to test electricity Source client;
The storage unit is configured as preserving correction data packet;
The needle bed is configured as making acquisition action according to client instructions, calibration facility is made to enter sample states;
The test power supply client is configured as executing operational order according to sampling work step flow, completes test power supply Precision adjustment.
Further, the sampling work step flow specifically includes:
The correction request and correction data packet of calibration facility are received, and controls needle bed and completes corresponding actions;
It controls data acquisition unit and current/voltage test is carried out to each channel successively, after the completion of test sample, by data It is sent to data processing unit;
The new calibration coefficient programming that data processing unit is sent sends acquisition to needle bed and has acted into test power supply At instruction.
Further, the setting value be sampled point electric current when each channel of test power supply set is sampled/ Voltage value.
Further, it when the measured value is that data acquisition unit is sampled, tests measured by the collecting unit of power supply Respective channel current/voltage value, the current/voltage value be shown in test power supply client on.
Further, the data processing unit be DSP coprocessors, the data processing unit by SPI interface with The MCU of control unit is into row data communication.
Further, the new calibration coefficient, specific calculating process include:
1) according to the data point of the current/voltage data set in each channel of test power supply, actual value and measured value point Each channel m order polynomial equations are not constructed, and wherein data point number is greater than equal to polynomial undetermined coefficient;
2) it brings sampling the data obtained point into m order polynomial equations respectively, obtains solving the required line of polynomial equation Property equation group, and it is minimum using the most short residual error for making correction test process curve of Euclidean distance, solve system of linear equations, to To required correction coefficient an, i.e., new calibration coefficient.
Further, after the needle bed receives the acquisition action command of client, the needle bed is controlled, calibration facility is made Sampling probe is contacted with the upper knit stitch of needle bed, is connected with the positive and negative anodes probe of test power supply by the upper knit stitch of needle bed, to Realize the sampling to testing power supply.
Further, the test power supply client by the new calibration coefficient received under the guiding of BootLoader Programming sends out sampling to needle bed and completes instruction, needle bed is made to return to original state into test power supply, and after the completion of programming.
A kind of working method of the automatic Calibration acquisition system of forming and capacity dividing test power supply, including be melted into as described above point The automatic Calibration acquisition system for holding test power supply, specifically includes:
1) sampling work step flow is sent to test power supply client;
2) control calibration facility enters sample states;
3) each channel for opening test power supply successively carries out current/voltage sampling to each channel;
4) the new calibration coefficient in test power supply each channel is calculated, and programming is into test power supply.
Further, in the step 3), after a channel for testing power supply is fully finished current/voltage sampling, then Another channel for opening test power supply carries out current/voltage sampling.
Compared with prior art, the beneficial effects of the invention are as follows:
The entire acquisition calibration process of the present invention is participated in without artificial, high degree of automation;
The calibration facility of the present invention can be developed according to customer demand, facilitate client according to the virtual condition of test power supply It decides in its sole discretion and whether demarcates;
The present invention can automatically monitor test system and test precision in real time, and provide action according to measuring accuracy attenuation state It is recommended that and being set for automatically correcting according to client;
Direct school of the forming and capacity dividing production line test power supply under structure and the complete permanence condition of wiring can be achieved in the present invention Just, it is not necessarily to additional electric wiring to connect, high degree of automation;
The measuring accuracy of the present invention carries out dynamic calibration to multiple spot and process data, both meets the high-precision of setting calibration point Test, and the precision of overall process dynamic test can be ensured to the full extent.
Description of the drawings
The accompanying drawings which form a part of this application are used for providing further understanding of the present application, and the application's shows Meaning property embodiment and its explanation do not constitute the improper restriction to the application for explaining the application.
Fig. 1 is the calibration facility and PERCOM peripheral communication structure chart of the present invention;
Fig. 2 is the new calibration coefficient calculation flow chart of the present invention;
Fig. 3 is the system work process flow chart of the present invention.
Specific implementation mode
The present invention is described further with specific embodiment below in conjunction with the accompanying drawings.
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific implementation mode, and be not intended to restricted root According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative It is also intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet Include " when, indicate existing characteristics, step, operation, device, component and/or combination thereof.
In the present invention, term for example "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", " side ", The orientation or positional relationship of the instructions such as "bottom" is to be based on the orientation or positional relationship shown in the drawings, only to facilitate describing this hair Bright each component or component structure relationship and the relative of determination, not refer in particular to either component or element in the present invention, cannot understand For limitation of the present invention.
In the present invention, term such as " affixed ", " connected ", " connection " shall be understood in a broad sense, and indicate may be a fixed connection, Can also be to be integrally connected or be detachably connected;It can be directly connected, it can also be indirectly connected through an intermediary.For The related scientific research of this field or technical staff can determine the concrete meaning of above-mentioned term in the present invention as the case may be, It is not considered as limiting the invention.
As background technology is introduced, forming and capacity dividing exists in the prior art and tests power supply due to electronic component aging And temperature influence be easy to cause measuring accuracy decline, and the calibration of existing forming and capacity dividing test power supply is completed before manufacture , the calibration process after manufacture is comparatively laborious and less efficient, needs professional to demarcate and examine it, automatically Change degree is low.To solve the above problems, the present invention propose a kind of forming and capacity dividing test power supply automatic Calibration acquisition system and Method, the data which can test forming and capacity dividing power supply carry out automatic collection and correction, improve test power supply precision.
As shown in Figure 1, a kind of automatic Calibration acquisition system of forming and capacity dividing test power supply, including calibration facility, needle bed and Power supply client is tested, the calibration facility includes control unit, storage unit, data acquisition unit and data processing unit;
Described control unit is configured as sending sampling work step flow to test power supply client;With
The data acquisition unit is controlled according to client instructions, and electric current/electricity is carried out to each channel for testing power supply successively Pressure acquisition, obtains the current/voltage actual value in each channel;With
Receive the current/voltage measuring value and setting value in each channel that test power supply client is sent;With
It controls the data processing unit and carries out new calibration coefficient calculating, and new calibration coefficient is sent to test electricity Source client;
The storage unit is configured as preserving correction data packet;
The needle bed is configured as making acquisition action according to client instructions, calibration facility is made to enter sample states;
The test power supply client is configured as executing operational order according to sampling work step flow, completes test power supply Precision adjustment.
The sampling work step flow specifically includes:
The correction request and correction data packet of calibration facility are received, and controls needle bed and completes corresponding actions;
It controls data acquisition unit and current/voltage test is carried out to each channel successively, after the completion of test sample, by data It is sent to data processing unit;
The new calibration coefficient programming that data processing unit is sent sends acquisition to needle bed and has acted into test power supply At instruction.
The setting value is sampled point current/voltage numerical value when each channel of test power supply set is sampled.
When the measured value is that data acquisition unit is sampled, the respective channel measured by the collecting unit of power supply is tested Current/voltage value, the current/voltage value be shown in test power supply client on
Specially:If the rated voltage for testing power supply is 5V, rated current 6A, then we can be equal by electric current and electric current It is even to be divided into 10 equal portions, successively 0.5V, 1.0V,,, the voltage sample point of 5V, 0.6A, 1.2A,,, the current sample of 6A Point, 0.5V here, 1.0V,,, 5V, 0.6A, 1.2A,,, 6A be to test the current/voltage in power supply each channel to set Definite value, and client is directed to corresponding show value there are one each setting values, as tests the electric current/electricity in each channel of power supply Measured value is pressed, which acquires gained by the sampling unit that test power supply carries, and calibration facility will there are one corresponding Collection value as tests the current/voltage actual value in each channel of power supply.
Described control unit is STM8S microprocessors, and described control unit passes through CAN interface and test power supply client It holds into row data communication.
Preferably, the data acquisition unit is high-precision AD acquisition chip, and the data acquisition unit passes through SPI interface It is connected with control unit, the data acquisition unit passes through high-accuracy instrument calibration in advance.
The data processing unit is DSP coprocessors, the data processing unit by SPI port and control unit into Row communication connection.
As shown in Fig. 2, the new calibration coefficient, specific calculating process include:
1) according to the data point of the current/voltage data set in each channel of test power supply, actual value and measured value point Each channel m order polynomial equations are not constructed, and wherein data point number is greater than equal to polynomial undetermined coefficient;
2) it brings sampling the data obtained point into m order polynomial equations respectively, obtains solving the required line of polynomial equation Property equation group, and it is minimum using the most short residual error for making correction test process curve of Euclidean distance, solve system of linear equations, to To required correction coefficient an(n of n=0,1,2 ...), i.e., new calibration coefficient.
In specific implementation, it is assumed that the electric current of a certain channel charging process is demarcated, which is carried out respectively 1A, The current sample of 2A, 3A, 4A, 5A record setting value, actual value and the measured value of each current sample point in the channel respectively, into And obtain the current data of each sampled point.And there is still a need for independent calibration for the electric current of discharge process, calibration process is similar with charging, Discharge current calibration is carried out to low sequence from high using discharge current size.
In order to keep the feature vector length that power channel is each tested in representative identical, it is logical that test power supply is embodied to the greatest extent The internal feature in road calculates the Euclidean distance between setting value, measured value and the actual value of test power channel, is adopted to electric current The P data recorded during sample are handled, and sampled data is p.
In the formula,
xsjIt is j-th of data of setting value on U-t charging curves;
xzjIt is j-th of data of actual value on U-t charging curves;
xrjIt is j-th of data of measured value on U-t charging curves;
M order polynomials are constructed to collected data point, the number of calibration data point is greater than undetermined equal to polynomial Coefficient:
We choose the setting value during an arbitrary constant-current charge and the similarity between actual value and can pass through Euclidean distance d (p (X between thems),Xz) describe.
Similarly, it can be deduced that actual value and measured value d (p (Xz),Xr) Euclidean distance.
Euclidean distance is smaller, then illustrates to set value matrix XsRow current data and true value matrix XzCapable electric current number According to closer, consistency is better.
The way of data fitting is exactly to keep Euclidean distance minimum, i.e. d (p (Xs),Xz)=min seeks data point (Xs,Xz) The curve y=P (x) of Euclidean distance minimum, function P (x) are known as fitting function, and new calibration coefficient is acquired by fitting function.
During current correction, the current value of setting refers to the expected of test power supply charge and discharge process and terminates current value, The current value is by the processing conversion of test power circuit, final control to stabling current value, since test power circuit exists There are certain error during conversion and control process, there are certain mistakes with final actual current value for the current value of setting Difference needs that the correction coefficient to current controling signal is added when setting value is converted into actual value, more accurate true to obtain Value, and test power supply is written into the correction coefficient of this transfer process.
Meanwhile testing power supply and the current value for flowing through positive and negative anodes is sampled, it is converted analog signals by A/D chip Digital signal, during conversion, there are certain error, need between measured value and actual value be added correction coefficient with More accurate measured value is obtained, and test power supply is written into the correction coefficient of this transfer process.
There are two types of modes for voltage calibration:One is quick voltage calibration, and one is dynamic electric voltage calibration.
Quick voltage is demarcated:Control unit directly controls generation standard voltage signal, which passes through test The A/D chip of power supply is converted into digital signal, and during conversion, there are certain errors, need in measured value and actual value Between correction coefficient is added to obtain more accurate measured value, and test power supply is written into the correction coefficient of this transfer process.
Dynamic electric voltage is demarcated:The voltage value of setting refers to the expection final voltage value of test power supply charge and discharge process, the electricity Pressure value is by the processing conversion of test power circuit, final control to stable voltage, due to test power circuit in conversion and There are certain errors, the voltage value of setting, there are certain error, to be needed with final actual voltage value during control process The correction coefficient to voltage control signal is added when setting value is converted into actual value, to obtain more accurate actual value, and will The correction coefficient write-in test power supply of this transfer process.
Meanwhile testing power supply and the stable voltage is sampled, digital letter is converted analog signals by A/D chip Number, during conversion, there are certain error, need to be added correction coefficient between measured value and actual value to obtain more Accurate measured value, and test power supply is written into the correction coefficient of this transfer process.
In the calibration process of electric current, it can obtain that setting value is converted into the correction coefficient of actual value and actual value is converted into The correction coefficient (i.e. AD conversion correction coefficient) of measured value, correction of a final proof is the result is that so that setting value, actual value and measured value three Person completely unifies.
In the calibration process of voltage, dynamic electric voltage calibration can obtain setting value be converted into the correction coefficient of actual value with Actual value is converted into the correction coefficient (i.e. AD conversion correction coefficient) of measured value, and correction of a final proof is the result is that so that setting value, true Value and measured value three complete unity;Quick voltage calibration can obtain correction coefficient (the i.e. AD that actual value is converted into measured value Translational correction coefficient), and setting value be converted into actual value correction coefficient acquiescence it is equal with previous coefficient, correction of a final proof the result is that So that actual value and measured value are equal in magnitude.Dynamic electric voltage demarcates relatively rapid voltage stated accuracy higher, but takes relatively Long, so the present invention provides two kinds of voltage calibration modes, user can rationally select according to the compromise of stated accuracy and nominal time Select voltage calibration mode.
After the needle bed receives the acquisition action command of client, the needle bed is controlled, makes calibration facility sampling probe Contact with the upper knit stitch of needle bed, be connected with the positive probe of test power supply by the upper needle of needle bed, by the knit stitch of needle bed with The negative probe of test power supply is connected, so that entire calibration facility enters sample states.
The test power supply client by the new calibration coefficient received under the guiding of BootLoader programming into survey Power supply is tried, and after the completion of programming, sending out sampling to needle bed completes instruction, and needle bed is made to return to original state.
In specific implementation, the calibration facility further includes power supply unit, and the power supply unit is DC/DC isolated power supplies.
The test power supply client is by CAN bus and calibration facility, test power supply and needle bed into row data communication.
As shown in figure 3, a kind of working method of the automatic Calibration acquisition system of forming and capacity dividing test power supply, including institute as above The automatic Calibration acquisition system for the forming and capacity dividing test power supply stated, specifically includes:
1) sampling work step flow is sent to test power supply client;
2) control calibration facility enters sample states;
3) each channel for opening test power supply successively carries out current/voltage sampling to each channel;
4) the new calibration coefficient in test power supply each channel is calculated, and programming is into test power supply.
The step 1) further includes whether checking system connection is normal, and whether communication is normal, and sends correction request to survey Power supply client is tried, request sends primary, maximum attempts 10 times every 10s, when reaching maximum attempts and do not receive To when response, system enters the overtime alert process process of connection.
In the step 3), after a channel for testing power supply is fully finished current/voltage sampling, then test electricity is opened Another channel in source carries out current/voltage sampling, while preserving the sampled data in each channel.
The foregoing is merely the preferred embodiments of the application, are not intended to limit this application, for the skill of this field For art personnel, the application can have various modifications and variations.Within the spirit and principles of this application, any made by repair Change, equivalent replacement, improvement etc., should be included within the protection domain of the application.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.

Claims (10)

1. a kind of automatic Calibration acquisition system of forming and capacity dividing test power supply, which is characterized in that including calibration facility, needle bed and survey Power supply client is tried, the calibration facility includes control unit, storage unit, data acquisition unit and data processing unit;
Described control unit is configured as sending sampling work step flow to test power supply client;With
The data acquisition unit is controlled according to client instructions successively to adopt each channel progress current/voltage for testing power supply Collection, obtains the current/voltage actual value in each channel;With
Receive the current/voltage measuring value and setting value in each channel that test power supply client is sent;With
It controls the data processing unit and carries out new calibration coefficient calculating, and new calibration coefficient is sent to test power supply visitor Family end;
The storage unit is configured as preserving correction data packet;
The needle bed is configured as making acquisition action according to client instructions, calibration facility is made to enter sample states;
The test power supply client is configured as executing operational order according to sampling work step flow, completes the essence of test power supply Degree adjustment.
2. a kind of automatic Calibration acquisition system of forming and capacity dividing test power supply as described in claim 1, which is characterized in that described Sampling work step flow specifically includes:
The correction request and correction data packet of calibration facility are received, and controls needle bed and completes corresponding actions;
It controls data acquisition unit and current/voltage test is carried out to each channel successively, after the completion of test sample, data are sent To data processing unit;
The new calibration coefficient programming that data processing unit is sent sends acquisition action to needle bed and completes to refer into test power supply It enables.
3. a kind of automatic Calibration acquisition system of forming and capacity dividing test power supply as described in claim 1, which is characterized in that described Setting value is sampled point current/voltage numerical value when each channel of test power supply set is sampled.
4. a kind of automatic Calibration acquisition system of forming and capacity dividing test power supply as described in claim 1, which is characterized in that described When measured value is that data acquisition unit is sampled, the current/voltage of the respective channel measured by the collecting unit of power supply is tested Value, the current/voltage value are shown in test power supply client.
5. a kind of automatic Calibration acquisition system of forming and capacity dividing test power supply as described in claim 1, which is characterized in that described Data acquisition unit is high-precision AD acquisition chip, and the data processing unit is DSP coprocessors.
6. a kind of automatic Calibration acquisition system of forming and capacity dividing test power supply as described in claim 1, which is characterized in that described New calibration coefficient, specific calculating process include:
1) structure is distinguished according to the data point of the current/voltage data set in each channel of test power supply, actual value and measured value Each channel m order polynomial equations are made, wherein data point number is greater than equal to polynomial undetermined coefficient;
2) it brings sampling the data obtained point into m order polynomial equations respectively, obtains solving the required linear side of polynomial equation Journey group, and it is minimum using the most short residual error for making correction test process curve of Euclidean distance, system of linear equations is solved, to obtain The correction coefficient a neededn(n of n=0,1,2 ...), i.e., new calibration coefficient.
7. a kind of automatic Calibration acquisition system of forming and capacity dividing test power supply as described in claim 1, which is characterized in that described After needle bed receives the acquisition action command of client, control the needle bed, make calibration facility sampling probe and needle bed up and down Needle contacts, and is connected with the positive and negative anodes probe of test power supply by the upper knit stitch of needle bed, to realize the sampling to testing power supply.
8. a kind of automatic Calibration acquisition system of forming and capacity dividing test power supply as described in claim 1, which is characterized in that described Testing power supply client, the programming under the guiding of BootLoader and is being burnt into test power supply by the new calibration coefficient received After writing complete, sends out sampling to needle bed and complete instruction, needle bed is made to return to original state.
9. a kind of working method of the automatic Calibration acquisition system of forming and capacity dividing test power supply, which is characterized in that including institute as above The automatic Calibration acquisition system for the forming and capacity dividing test power supply stated, specifically includes:
1) sampling work step flow is sent to test power supply client;
2) control calibration facility enters sample states;
3) each channel for opening test power supply successively carries out current/voltage sampling to each channel;
4) the new calibration coefficient in test power supply each channel is calculated, and programming is into test power supply.
10. a kind of working method of the automatic Calibration acquisition system of forming and capacity dividing test power supply as claimed in claim 9, special Sign is, in the step 3), after a channel for testing power supply is fully finished current/voltage sampling, then opens test electricity Another channel in source carries out current/voltage sampling.
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