CN112858983B - Automatic calibration method and system for shunt - Google Patents
Automatic calibration method and system for shunt Download PDFInfo
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Abstract
The application provides a method and a system for automatically calibrating a shunt, wherein the method comprises the following steps: acquiring intrinsic information and historical calibration information of the shunt; determining the calibration parameter according to the intrinsic information, the historical calibration information and the calibration expectation comprises the following steps: segment compensation type, number of compensation segments, and calibration expected accuracy; determining standard current source parameters and process parameters of the segmented output current according to the calibration parameters and outputting the standard current in a segmented manner; acquiring a temperature value and a current value of the shunt in real time; calculating segment compensation data through a calibration compensation model, and establishing a segment compensation database; and importing the segment compensation database to digitally calibrate the shunt. And establishing different types of segment compensation databases by classifying and testing the shunt, and importing the segment compensation databases of corresponding types to digitally calibrate the shunt. Aiming at calibration of batch shunts, the calibration operation can be simplified, the calibration efficiency is improved, and the calibration accuracy and the digitizing level are improved.
Description
Technical Field
The invention belongs to the technical field of electric quantity measurement and informatization, and particularly relates to a method and a system for automatically calibrating a shunt.
Background
The shunt is a sensing device for measuring direct current and is used for measuring direct current and large current. The high-power current divider mainly comprises a low-value resistor, when direct current flows through the current divider according to the ohm theorem, voltage drops are generated at the two ends of the current divider resistor, and the current value can be calculated by measuring the voltage drops at the two ends of the current divider resistor. The current divider has the advantages of simple structure, reliable operation, stable performance and low cost, and is widely used for direct current measurement in the fields of high-power chargers, high-power rectifiers, high-power inverters, battery energy storage and the like.
However, in practical application, the current divider has the problems of low measurement accuracy, large heating influence, difficult realization of temperature compensation, large secondary wiring influence and the like; meanwhile, the consistency of the shunt products produced by different manufacturers and different batches is difficult to ensure, and the workload of batch adjustment and calibration is large.
The existing shunt calibration is measured through external equipment, size adjustment is carried out according to error data obtained through measurement, and adjustment and calibration are carried out on the shunt. The operation of the calibration of the shunt is complex, the accuracy and the efficiency of the calibration are low, and the calibration workload of the shunt for batch is large, so that the digital calibration can not be realized.
Disclosure of Invention
The application provides a method and a system for automatically calibrating a shunt. The problems that the existing shunt is complex in calibration operation, low in calibration accuracy and efficiency and incapable of achieving digital calibration are solved.
In one aspect, the present application provides a method for automatically calibrating a shunt, comprising:
acquiring intrinsic information and historical calibration information of the shunt;
determining a current calibration parameter according to the intrinsic information, the historical calibration information and the current calibration expectation, wherein the current calibration parameter comprises: segment compensation type, number of compensation segments, and calibration expected accuracy;
determining a standard current source parameter and a process parameter of a segmented output current according to the segment compensation type, the compensation segment number and the calibration expected accuracy;
outputting standard current in a segmented mode according to the process parameters of the segmented output current;
acquiring a temperature value and a current value corresponding to the shunt in real time;
calculating segment compensation data through a calibration compensation model according to the temperature value, the current value and the intrinsic information, and establishing a segment compensation database according to the segment compensation data;
importing the segment compensation database, and digitally calibrating the shunt according to the segment compensation database.
Optionally, the segment compensation database includes: the system comprises a characteristic experience type segment compensation database, a precise real-time segment compensation database and a newly added segment compensation database.
Optionally, the method further comprises building the characteristic empirical type segmentation compensation database:
the shunts are classified, and a plurality of shunts of the same type are selected for testing. Acquiring intrinsic information and segment test data of a plurality of shunts of each type, the segment test data comprising: a standard current source parameter and a process parameter of the sectional output current, wherein the plurality of current splitters respectively correspond to the temperature value and the current value measured by the section;
outputting standard current in a segmented mode according to the test standard current source parameters and the process parameters of the test segmented output current;
acquiring temperature values and current values corresponding to a plurality of current splitters of the same type in real time;
and calculating the sectional compensation data of the current divider of the same type through a calibration compensation model according to the temperature value, the current value and the intrinsic information, and establishing the characteristic experience type sectional compensation database according to the sectional compensation data of the current divider of the same type.
Optionally, the method further comprises establishing the precise real-time type segment compensation database:
acquiring intrinsic information and segmented precision test data of a single shunt, the segmented precision test data comprising: precisely compensating the number of segments, parameters of a standard current source, process parameters of the output current of the segments, and temperature values and current values measured by corresponding segments of the current divider;
outputting standard current in a segmented mode according to the process parameters of the precise test segmented output current;
acquiring a temperature value and a current value of the shunt in real time;
calculating the segmentation precision compensation data through a calibration compensation model according to the temperature value, the current value, the intrinsic information and the segmentation precision test data, and establishing the precision real-time segmentation compensation database according to the segmentation precision compensation data.
Optionally, the method further comprises the step of establishing the newly added segment compensation database:
if the shunt type is not in the empirical shunt segment compensation database, an additional shunt segment compensation database is added. Acquiring intrinsic information of the shunt type and segment test data, wherein the segment test data comprises: the standard current source parameter, the process parameter of the sectional output current, and the temperature value and the current value measured by the corresponding sections of the current divider;
outputting standard current in a segmented mode according to the process parameters of the segmented output current;
acquiring a temperature value and a current value corresponding to the shunt in real time;
calculating segment compensation data through a calibration compensation model according to the temperature value, the current value and the intrinsic information, and establishing the newly added segment compensation database according to the segment compensation data.
Optionally, the intrinsic information includes: the temperature coefficient of the shunt, the nominal resistance of the shunt and the temperature at which the nominal resistance of the shunt is calibrated.
Optionally, the step of calculating the segment compensation data by calibrating the compensation model according to the temperature value, the current value and the intrinsic information includes:
calculating a resistance compensation correction coefficient according to the temperature value, the current value and the temperature coefficient of the shunt, wherein the nominal resistance value of the shunt and the temperature of the nominal resistance value of the shunt are calibrated;
and calculating a resistance compensation correction value through a calibration compensation model according to the resistance compensation correction coefficient.
Optionally, the formula for calculating the resistance compensation correction coefficient is:
wherein K is cj Compensating correction coefficient for resistance of j-th segment, alpha is temperature coefficient of shunt, T j To measure the temperature value of the shunt in real time, T 0 Temperature value at calibration for nominal resistance value of shunt, I pj The current value of the shunt of the j-th section, I sj And outputting a standard current value for the j-th segment.
Optionally, the formula for calculating the resistance compensation correction value through the calibration compensation model is as follows:
R cj ＝K cj ·R s ；
wherein R is cj Resistance compensation correction value K for j-th segment cj Compensating the correction coefficient for the resistance of the j-th segment, R S Nominal resistance for the shunt.
In another aspect, the present application further provides an automatic calibration system for a shunt, for performing the method described above, comprising: the control computer, and the direct current standard current source and the current divider which are connected with the control computer are connected through wires;
wherein the control computer is configured to: acquiring intrinsic information and historical calibration information of the shunt; determining a current calibration parameter according to the intrinsic information, the historical calibration information and the current calibration expectation, wherein the current calibration parameter comprises: segment compensation type, number of compensation segments, and calibration expected accuracy; determining a standard current source parameter and a process parameter of a segmented output current according to the segmented compensation type, the compensation segmented number and the calibration expected accuracy, and transmitting the process parameter of the segmented output current to the direct current standard current source; controlling the direct current standard current source to output current according to segments, and acquiring the temperature value and the current value of the shunt in real time; calculating sectional compensation data through a calibration compensation model according to the temperature value, the current value, the intrinsic information and the temperature value and the current value measured by the shunt, and establishing a sectional compensation database according to the sectional compensation data; importing the segment compensation database, and digitally calibrating the shunt according to the segment compensation database;
the direct current standard current source is used for: receiving a process parameter of the segmented output current; and outputting standard current in a segmented mode according to the process parameters of the segmented output current.
According to the technical scheme, the application provides a method and a system for automatically calibrating a shunt, wherein the method comprises the following steps: acquiring intrinsic information and historical calibration information of the shunt; determining a current calibration parameter according to the intrinsic information, the historical calibration information and the current calibration expectation, wherein the current calibration parameter comprises: segment compensation type, number of compensation segments, and calibration expected accuracy; determining a standard current source parameter and a process parameter of a segmented output current according to the segment compensation type, the compensation segment number and the calibration expected accuracy; outputting standard current in a segmented mode according to the process parameters of the segmented output current; acquiring a temperature value and a current value of the shunt in real time; calculating sectional compensation data through a calibration compensation model according to the temperature value, the current value and the intrinsic information, and establishing a sectional compensation database according to the sectional compensation data; importing the segment compensation database, and digitally calibrating the shunt according to the segment compensation database.
The application provides a method and a system for automatically calibrating a shunt, wherein corresponding segment compensation databases are established for different types of shunts, and the segment compensation databases are imported for digital calibration when the shunts are calibrated. The calibration operation can be simplified, the accuracy and consistency of calibration are improved, and meanwhile, the calibration efficiency and the digital calibration level are improved for the calibration of the batch shunt.
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In order to more clearly illustrate the technical solutions of the present application, the drawings that are needed in the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a flow chart of one embodiment of a method for automatic calibration of a shunt provided herein;
FIG. 2 is a schematic diagram of an embodiment of an automatic calibration system for a shunt according to the present application.
Detailed Description
Reference will now be made in detail to the embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The embodiments described in the examples below do not represent all embodiments consistent with the present application. Merely as examples of systems and methods consistent with some aspects of the present application as detailed in the claims.
Referring to fig. 1, fig. 1 is a flowchart of an embodiment of a method for automatic calibration of a shunt provided in the present application. In one aspect, the present application provides a method for automatically calibrating a shunt, comprising:
s1: intrinsic information and historical calibration information of the shunt are obtained.
In some embodiments, optionally, the intrinsic information includes: the temperature coefficient of the shunt, the nominal resistance of the shunt and the temperature at which the nominal resistance of the shunt is calibrated. Further comprises: the model, number, measuring range, initial accuracy level, manufacturing material, calibration state and other basic information of the shunt. The historical calibration information includes: the type of historical calibration compensation, the date of the historical calibration, the number of historical calibration compensation segments, the accuracy of the historical calibration segment compensation target, etc. The intrinsic information and the historical calibration information are used for determining parameters of the calibration.
S2: determining a current calibration parameter according to the intrinsic information, the historical calibration information and the current calibration expectation, wherein the current calibration parameter comprises: segment compensation type, number of compensation segments, and calibration expected accuracy.
In this embodiment, the method for determining the current calibration parameter according to the intrinsic information, the historical calibration information and the current calibration expectation may obtain the current calibration parameter by analyzing the intrinsic information and the historical calibration information according to a preset rule. The calibration parameters can also be selected according to past experience and the expected requirement of the calibration accuracy.
Specifically, the segmentation compensation type comprises a characteristic experience type, a precise real-time type and a new addition type. The compensation segmentation number assumes that the measurable range of the shunt is 0-100A, and the segmentation can be set according to the influence factors such as the requirement of calibration expected accuracy and the like: four sections of 0-5A,5-20A,20-50A and 50-100A. The calibration is expected to have accuracy, e.g., the original accuracy level of the shunt is 0.5 level, the calibration is corrected to be better than 0.1 level, the finer the segment, the higher the expected accuracy that can be achieved.
S3: and determining a standard current source parameter and a process parameter of the segmented output current according to the segmented compensation type, the compensation segmented number and the calibration expected accuracy. The process parameters of the segmented output current comprise parameters such as the number of segments of the output current, the current value of the standard current output by each segment, the output duration time and the like.
S4: and outputting standard current in a segmented mode according to the process parameters of the segmented output current.
S5: and acquiring the temperature value and the current value of the shunt in real time.
S6: calculating segment compensation data through a calibration compensation model according to the temperature value, the current value and the intrinsic information, and establishing a segment compensation database according to the segment compensation data.
Optionally, the step of calculating the segment compensation data by calibrating the compensation model according to the temperature value, the current value and the intrinsic information includes:
s61: and calculating a resistance compensation correction coefficient according to the temperature value, the current value and the temperature coefficient of the shunt, wherein the nominal resistance value of the shunt and the temperature value of the nominal resistance value of the shunt are calibrated.
Optionally, the formula for calculating the resistance compensation correction coefficient is:
wherein K is cj Compensating correction coefficient for resistance of j-th segment, alpha is temperature coefficient of shunt, T j To measure the temperature value of the shunt in real time, T 0 Temperature value at calibration for nominal resistance value of shunt, I pj The current value of the shunt of the j-th section, I sj And outputting a standard current value for the j-th segment.
S62: and calculating a resistance compensation correction value through a calibration compensation model according to the resistance compensation correction coefficient.
Optionally, the formula for calculating the resistance compensation correction value through the calibration compensation model is as follows:
R cj ＝K cj ·R s ；
wherein R is cj Resistance compensation correction value K for j-th segment cj Compensating the correction coefficient for the resistance of the j-th segment, R S Nominal resistance for the shunt.
S7: importing the segment compensation database, and digitally calibrating the shunt according to the segment compensation database.
Optionally, the segment compensation database includes: the system comprises a characteristic experience type segment compensation database, a precise real-time segment compensation database and a newly added segment compensation database.
In this embodiment, the feature empirical type segment compensation database is constructed in advance after summarizing and refining data rules through earlier experimental researches such as classification test and segment test on the current divider. The characteristic experience type segmented compensation database is constructed in advance, each calibration is only carried out on the low-end segment and full-scale value segment of the measuring range of the shunt, and other segments can be formed by directly applying characteristic experience type data values and correcting the proportion corresponding to the full-scale values. The characteristic experience type subsection compensation database is mainly applied to calibration of the shunt in batches, and the calibration efficiency can be greatly improved.
The precise real-time type sectional compensation database is used for obtaining sectional compensation correction data after the sectional calibration of the single shunt process parameters by means of sectional refinement measurement, constructing the precise real-time sectional compensation database of the single shunt in real time, importing the precise real-time sectional compensation database into the digital module of the shunt, and carrying out precise compensation correction on the measured result when the shunt is actually used. The precise real-time type subsection compensation database is more and finer in subsection, and each set subsection is measured and calculated during each calibration. The accuracy of the calibration of the splitter by the precise real-time type segment compensation database is higher, so that the method is mainly applied to one or a small number of splitter calibrations and splitter calibrations with high requirements on the expected accuracy after the calibration.
The newly added type segment compensation database is designed aiming at the characteristic experience type segment compensation database application which is constructed in a quasi-new mode, and the segment compensation database category is expanded. The newly added segmented compensation database is characterized in that the corresponding characteristic empirical segmented compensation database is not available, and the segmented compensation database needs to be constructed in a supplementary mode, so that subsequent application is facilitated, and the segmented compensation database is continuously perfected.
The following are provided as some of the feature empirical type segment compensation database, the precision real-time type segment compensation database, and the method for creating the newly added segment compensation database that can be implemented:
optionally, the method further comprises building the feature empirical type piecewise compensation database:
the shunts are classified, and a plurality of shunts of the same type are selected for testing. Acquiring intrinsic information and segment test data of a plurality of shunts of each type, the segment test data comprising: a standard current source parameter and a process parameter of the sectional output current, wherein the plurality of current splitters respectively correspond to the temperature value and the current value measured by the section;
outputting standard current in a segmented mode according to the process parameters of the output current of the test segment;
acquiring temperature values and current values corresponding to a plurality of current splitters of the same type in real time;
calculating the sectional compensation data of a plurality of shunts of the same type through a calibration compensation model according to the temperature value, the current value and the intrinsic information, carrying out average processing on the sectional compensation data corresponding to the shunts to obtain the sectional compensation data of the characteristic type shunt, and establishing the characteristic experience type sectional compensation database according to the sectional compensation data of the characteristic type shunt.
Optionally, the method further comprises establishing the precision real-time type segment compensation database:
acquiring intrinsic information and segmented precision test data of a single shunt, the segmented precision test data comprising: precisely compensating the number of segments, parameters of a standard current source, process parameters of the output current of the segments, and temperature values and current values measured by corresponding segments of the current divider;
outputting standard current in a segmented mode according to the process parameters of the precise test segmented output current;
acquiring a temperature value and a current value of the shunt in real time;
calculating the segmentation precision compensation data through a calibration compensation model according to the temperature value, the current value, the intrinsic information and the segmentation precision test data, and establishing the precision real-time segmentation compensation database according to the segmentation precision compensation data.
Optionally, the method further includes establishing the newly added segment compensation database:
if the shunt type is not in the empirical shunt segment compensation database, an additional shunt segment compensation database is added. Acquiring intrinsic information of the shunt type and segment test data, wherein the segment test data comprises: the standard current source parameter, the process parameter of the sectional output current, and the temperature value and the current value measured by the corresponding sections of the current divider;
outputting standard current in a segmented mode according to the process parameters of the segmented output current;
acquiring a temperature value and a current value corresponding to the shunt in real time;
calculating segment compensation data through a calibration compensation model according to the temperature value, the current value and the intrinsic information, and establishing the newly added segment compensation database according to the segment compensation data.
Referring to fig. 2, fig. 2 is a schematic structural diagram of an embodiment of an automatic calibration system for a shunt provided in the present application. In another aspect, the present application further provides an automatic calibration system for a shunt, for performing the method described above, comprising: a control computer 1, and a direct current standard current source 2 and a current divider 3 which are connected with the control computer 1, wherein the direct current standard current source 2 and the current divider 3 are connected through wires;
wherein, control computer 1 is used for: acquiring intrinsic information and historical calibration information of the shunt 3; determining a current calibration parameter according to the intrinsic information, the historical calibration information and the current calibration expectation, wherein the current calibration parameter comprises: segment compensation type, number of compensation segments, and calibration expected accuracy; determining a standard current source parameter and a process parameter of a segmented output current according to the segmented compensation type, the compensation segmentation number and the calibration expected accuracy, and transmitting the process parameter of the segmented output current to the direct current standard current source 2; controlling the direct current standard current source 2 to output standard current according to segments, and acquiring the temperature value and the current value of the current divider 3 in real time; calculating sectional compensation data through a calibration compensation model according to the temperature value, the current value and the intrinsic information, and establishing a sectional compensation database according to the sectional compensation data; importing the segment compensation database, and digitally calibrating the shunt according to the segment compensation database;
the direct current standard current source 2 is used for: receiving a process parameter of the segmented output current; and outputting standard current in a segmented mode according to the process parameters of the segmented output current.
According to the technical scheme, the application provides a method and a system for automatically calibrating a shunt, wherein the method comprises the following steps: acquiring intrinsic information and historical calibration information of the shunt; determining a current calibration parameter according to the intrinsic information, the historical calibration information and the current calibration expectation, wherein the current calibration parameter comprises: segment compensation type, number of compensation segments, and calibration expected accuracy; determining a standard current source parameter and a process parameter of a segmented output current according to the segment compensation type, the compensation segment number and the calibration expected accuracy; outputting standard current in a segmented mode according to the process parameters of the segmented output current; acquiring a temperature value and a current value of the shunt in real time; calculating sectional compensation data through a calibration compensation model according to the temperature value, the current value and the intrinsic information, and establishing a sectional compensation database according to the sectional compensation data; importing the segment compensation database, and digitally calibrating the shunt according to the segment compensation database.
The application provides a method and a system for automatically calibrating a shunt, wherein corresponding segment compensation databases are established for different types of shunts, and the segment compensation databases are imported for digital calibration when the shunts are calibrated. The calibration operation can be simplified, the accuracy and consistency of calibration are improved, and meanwhile, the calibration efficiency and the digital calibration level are improved for the calibration of the batch shunt.
The foregoing detailed description of the embodiments is merely illustrative of the general principles of the present application and should not be taken in any way as limiting the scope of the invention. Any other embodiments developed in accordance with the present application without inventive effort are within the scope of the present application for those skilled in the art.
Claims (10)
1. A method for automatically calibrating a shunt, comprising:
acquiring intrinsic information and historical calibration information of the shunt;
determining a current calibration parameter according to the intrinsic information, the historical calibration information and the current calibration expectation, wherein the current calibration parameter comprises: segment compensation type, number of compensation segments, and calibration expected accuracy;
determining a standard current source parameter and a process parameter of a segmented output current according to the segment compensation type, the compensation segment number and the calibration expected accuracy;
outputting standard current in a segmented mode according to the process parameters of the segmented output current;
acquiring a temperature value and a current value of the shunt in real time;
calculating segment compensation data through a calibration compensation model according to the temperature value, the current value and the intrinsic information, and establishing a segment compensation database according to the segment compensation data; the calibration compensation model comprises a resistance compensation correction coefficient and a nominal resistance value of the shunt;
importing the segment compensation database, and digitally calibrating the shunt according to the segment compensation database.
2. The method of shunt auto-calibration according to claim 1, wherein said segment compensation database comprises: the system comprises a characteristic experience type segment compensation database, a precise real-time segment compensation database and a newly added segment compensation database.
3. The method of shunt auto-calibration according to claim 2, further comprising building the feature empirical piecewise compensation database:
classifying the shunts, and selecting a plurality of shunts of the same type for testing; acquiring intrinsic information and segment test data of a plurality of shunts of each type, the segment test data comprising: a standard current source parameter and a process parameter of the sectional output current, wherein the plurality of current splitters respectively correspond to the temperature value and the current value measured by the section;
outputting standard current in a segmented mode according to the standard current source parameters and the process parameters of the segmented output current;
acquiring temperature values and current values corresponding to a plurality of current splitters of the same type in real time;
and calculating the sectional compensation data of the current divider of the same type through a calibration compensation model according to the temperature value, the current value and the intrinsic information, and establishing the characteristic experience type sectional compensation database according to the sectional compensation data of the current divider of the same type.
4. The method of automatic calibration of a shunt according to claim 2, further comprising building the precision real-time piecewise compensation database:
acquiring intrinsic information and segmented precision test data of a single shunt, the segmented precision test data comprising: precisely compensating the number of segments, parameters of a standard current source, process parameters of the output current of the segments, and temperature values and current values measured by corresponding segments of the current divider;
outputting standard current in a segmented mode according to the process parameters of the segmented output current;
acquiring a temperature value and a current value of the shunt in real time;
calculating the segmentation precision compensation data through a calibration compensation model according to the temperature value, the current value, the intrinsic information and the segmentation precision test data, and establishing the precision real-time segmentation compensation database according to the segmentation precision compensation data.
5. The method of shunt auto-calibration according to claim 2, further comprising building the newly added segment compensation database:
if the shunt type is not in the empirical type subsection compensation database, adding a newly added shunt subsection compensation database; acquiring intrinsic information of the shunt type and segment test data, wherein the segment test data comprises: the standard current source parameter, the process parameter of the sectional output current, and the temperature value and the current value measured by the corresponding sections of the current divider;
outputting standard current in a segmented mode according to the process parameters of the segmented output current;
acquiring a temperature value and a current value corresponding to the shunt in real time;
calculating segment compensation data through a calibration compensation model according to the temperature value, the current value and the intrinsic information, and establishing the newly added segment compensation database according to the segment compensation data.
6. The method of automatic calibration of a shunt according to any one of claims 1 to 5, characterized in that said intrinsic information comprises: the temperature coefficient of the shunt, the nominal resistance of the shunt and the temperature at which the nominal resistance of the shunt is calibrated.
7. The method of automatic calibration of a shunt according to claim 6, wherein said step of calculating segment compensation data by a calibration compensation model based on said temperature value, said current value and said intrinsic information comprises:
calculating a resistance compensation correction coefficient according to the temperature value, the current value and the temperature coefficient of the shunt, wherein the nominal resistance value of the shunt and the temperature of the nominal resistance value of the shunt are calibrated;
and calculating a resistance compensation correction value through a calibration compensation model according to the resistance compensation correction coefficient.
8. The method of automatic calibration of a shunt according to claim 7, wherein the formula for calculating the resistance compensation correction factor is:
wherein K is cj Compensating correction coefficient for resistance of j-th segment, alpha is temperature coefficient of shunt, T j For the temperature value measured in real time by the shunt, T 0 Temperature at calibration for nominal resistance value of shunt, I pj The current value of the shunt of the j-th section, I sj And outputting a standard current value for the j-th segment.
9. The method for automatically calibrating a shunt according to claim 7, wherein said calculating a resistance compensation correction value by a calibration compensation model is formulated as:
R cj ＝K cj ·R s
wherein R is cj Resistance compensation correction value K for j-th segment cj Compensating the correction coefficient for the resistance of the j-th segment, R S Nominal resistance for the shunt.
10. A shunt auto-calibration system for performing the method of any one of claims 1-9, comprising: the control computer (1) and the direct current standard current source (2) and the current divider (3) which are connected with the control computer (1), wherein the direct current standard current source (2) and the current divider (3) are connected through a wire;
wherein the control computer (1) is configured to: acquiring intrinsic information, historical calibration information and a measured temperature value and a current value of the shunt (3); determining a current calibration parameter according to the intrinsic information, the historical calibration information and the current calibration expectation, wherein the current calibration parameter comprises: segment compensation type, number of compensation segments, and calibration expected accuracy; determining a standard current source parameter and a process parameter of a segmented output current according to the segmented compensation type, the compensation segmentation number and the calibration expected accuracy, and transmitting the process parameter of the segmented output current to the direct current standard current source (2); acquiring a temperature value and a current value of the shunt (3) in real time; calculating sectional compensation data through a calibration compensation model according to the temperature value, the current value and the intrinsic information, and establishing a sectional compensation database according to the sectional compensation data; importing the segment compensation database, and digitally calibrating the shunt according to the segment compensation database;
the direct current standard current source (2) is used for: receiving a process parameter of the segmented output current; and outputting standard current in a segmented mode according to the process parameters of the segmented output current.
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