CN117805713A - Current sensor testing system and method - Google Patents
Current sensor testing system and method Download PDFInfo
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- CN117805713A CN117805713A CN202311862446.0A CN202311862446A CN117805713A CN 117805713 A CN117805713 A CN 117805713A CN 202311862446 A CN202311862446 A CN 202311862446A CN 117805713 A CN117805713 A CN 117805713A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
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Abstract
The invention relates to a current sensor testing system and a current sensor testing method. The test system includes: the adjustable current source is connected with the test cable in series and is used for providing environment current; the current sensor to be tested is used for detecting the environment current to output a test current value; the test reference module is used for monitoring the environment current output standard current value; the industrial control module is used for controlling the adjustable current source to output the environment currents with different magnitudes, further collecting the test current values and the standard current values under different environment currents, and obtaining a test result after comparison analysis. The invention can accurately detect various performance parameters of the current sensor.
Description
Technical Field
The invention relates to the technical field of current sensor detection, in particular to a current sensor testing system and a current sensor testing method.
Background
The current sensor is a high-precision direct current sensor and is mainly arranged in a battery pack busbar, the magnetic field intensity in the magnetic core is measured through an internal MCU, and the magnetic field intensity is converted into a current value and then is output through a message, so that the charging and discharging current of the power battery is monitored. In order to solve the problem that the current sensor needs to have different message outputs under different currents, the sensor needs to be subjected to necessary fitting calibration. Therefore, it is necessary to provide a control system for testing and calibrating the current sensor, which is suitable for application occasions such as charging and discharging current monitoring of power batteries such as EV and HEV, and high-precision current monitoring after the current sensor is calibrated. The existing test system has the problems of insufficient precision and incomplete product parameter test.
Disclosure of Invention
The invention aims to provide a current sensor testing system and a current sensor testing method, which can accurately detect various performance parameters of a current sensor.
The technical scheme adopted for solving the technical problems is as follows: there is provided a current sensor testing system comprising:
the adjustable current source is connected with the test cable in series and is used for providing environment current;
the current sensor to be tested is used for detecting the environment current to output a test current value;
the test reference module is used for monitoring the environment current output standard current value;
the industrial control module is used for controlling the adjustable current source to output the environment currents with different magnitudes, further collecting the test current values and the standard current values under different environment currents, and obtaining a test result after comparison analysis.
Further, the test reference module comprises a current transformer, and the current transformer is sleeved in the test cable and is used for monitoring the environment current to obtain a standard current value.
Further, the test reference module further comprises a program-controlled universal meter, and the program-controlled universal meter is used for reading the standard current value and uploading the standard current value to the industrial control module.
Further, the adjustable current source comprises a direct current source and an adjustable load which is respectively connected with the direct current source and the test cable in series, and the adjustable load is used for adjusting the magnitude of the environmental current according to a control signal sent by the industrial control module.
Further, the device also comprises a direct current contactor, wherein the direct current contactor is arranged between the adjustable current source and the test cable and is used for adjusting the direction of the environment current.
Further, the current sensor further comprises a controllable voltage source, wherein the controllable voltage source is used for providing test voltages with different magnitudes for the current sensor to be tested.
Further, the device also comprises a working current collector, wherein the working current collector is connected with the current sensor to be tested in series and is used for collecting the internal working current of the current sensor.
Further, the current sensor to be measured comprises a plurality of current sensors, the industrial control module comprises a CAN acquisition box and an upper computer, the CAN acquisition box is used for acquiring the test current values output by the plurality of current sensors and sending the test current values to the upper computer, and correction parameters fitted by the upper computer are sent to the current sensors for calibration.
The technical scheme adopted for solving the technical problems is as follows: there is provided a current sensor testing method, applied to a system as described above, comprising the steps of:
s0. adjusting the ambient current to a set point;
s1, selecting a current measurement range of a program-controlled universal meter according to the magnitude of the environmental current;
s2, acquiring a test current value acquired by a current sensor to be tested and a standard current value acquired by a test reference module;
s3, repeating the steps S0-S2 until the preset number of the test current values and the standard current values under different current measuring ranges are obtained;
s4, fitting correction parameters under different current measurement ranges by using a least square method according to the test current value and the standard current value, and calibrating the current sensor to be measured by using the correction parameters.
Further, before step S3, the method further includes a step of adjusting the direction of the ambient current by using a dc contactor, and collecting the test current value and the standard current value in different directions.
Advantageous effects
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects: according to the invention, the adjustable current source outputs environment currents with different directions and different sizes, the environment current is monitored through the high-precision current transformer, the measuring range of the universal meter is selected according to the size of the environment current, and the standard current value is collected through the test reference module and used as the reference of the test current value collected by the current sensor to be tested, so that the test can cover the current range as large as possible, and the standard current values under different environment currents are more accurate; meanwhile, correction parameters under different measuring ranges are fitted through a least square method, so that the correction parameters are more accurate; according to the invention, the working current collector is used for collecting the internal working current of the current sensor to be tested in different working environments, so that the comprehensiveness of the test is further increased.
Drawings
FIG. 1 is a schematic system diagram of a first embodiment of the present invention;
FIG. 2 is a schematic diagram of a current sensor under test according to a first embodiment of the present invention;
FIG. 3 is a system diagram of a first embodiment of the present invention;
FIG. 4 is a schematic diagram of a system for simultaneous testing of multiple current sensors according to a first embodiment of the present invention;
fig. 5 is a flow chart of a second embodiment of the present invention.
Detailed Description
The invention will be further illustrated with reference to specific examples. It is to be understood that these examples are illustrative of the present invention and are not intended to limit the scope of the present invention. Further, it is understood that various changes and modifications may be made by those skilled in the art after reading the teachings of the present invention, and such equivalents are intended to fall within the scope of the claims appended hereto.
A first embodiment of the present invention relates to a current sensor testing system, as shown in fig. 1, comprising:
the adjustable current source is connected with the test cable in series and is used for providing environment current;
the current sensor to be tested is used for detecting the environmental current and outputting a test current value;
the test reference module is used for monitoring an environment current output standard current value;
the industrial control module comprises a CAN acquisition box and an upper computer and is used for controlling the adjustable current source to output environment currents with different magnitudes, further acquiring test current values and standard current values under different environment currents, and obtaining test results after comparison analysis. The industrial control module CAN also fit correction parameters through a least square method according to the test current value and the standard current value, and write the correction parameters into the current sensor to be tested through the CAN bus to realize the calibration process of the current sensor to be tested.
The adjustable current source comprises a direct current source and an adjustable load which is respectively connected with the direct current source and the test cable in series, and the adjustable load adjusts the magnitude of the environmental current according to a control signal sent by the industrial control module. The test reference module comprises a current transformer and a program-controlled universal meter, wherein the current transformer is sleeved into the test cable and used for monitoring the environment current to obtain a standard current value, and the program-controlled universal meter is used for reading the standard current value and uploading the standard current value to the industrial control module. In some embodiments, the system further comprises a dc contactor disposed between the adjustable current source and the test cable for switching the direction of the ambient current.
More preferably, the system CAN measure a plurality of current sensors simultaneously, the test current values output by the plurality of current sensors are collected through the CAN collection box and sent to the upper computer, and the corrected parameters after fitting are written into the current sensors to be measured through the CAN bus, so that 20 current sensors to be measured CAN be calibrated simultaneously. And a controllable voltage source can be added to provide test voltages with different magnitudes for the current sensor to be tested, so as to measure the relevant performance of the current sensor under various extreme voltage environments and test whether the message output of the current sensor to be tested under an abnormal working voltage environment is normal or not. The controllable voltage source can adopt a programmable power supply to provide stable power supply for at least 1 and at most 10 current sensors to be tested. The system also comprises a working current collector, wherein the working current collector can adopt a plurality of paths of collectors, and is connected with the plurality of current sensors to be tested in series to collect the internal working current of the current sensors.
The above system is further described below in connection with testing of a particular product.
FDC1205 is a type of high-precision current sensor. The structure of which is shown in figure 2. The power supply of the sensor is +9V to +16V; the signal output is CAN bus signal output.
Through the current sensor service environment, a fitting test system shown in fig. 3 is built, and mainly comprises the following parts:
1. current source (1): the high-precision low-voltage high-current equipment provides environment current for the current sensor, and a direct current source is adopted as a current generating source.
2. High precision electronic load (2): the current source is matched with the current source (1) to be connected in series to the current source (1) for adjusting the ambient current of the circuit.
CAN acquisition box (3): and a peripheral work 4-channel can communication box is adopted to carry out TCP/IP communication with an upper computer, and the output message of the current sensor is collected.
4. Working current collector (4): and each test channel is connected in series with a current sensor for collecting the working current value of the current sensor, and the working current value is uploaded to an upper computer through 485 communication.
5. A controllable voltage source (5): the upper computer controls the power supply voltage through TCP/IP communication by adopting a program-controlled voltage-stabilized power supply (program-controlled current source), on one hand, the working voltage of 9-16V can be provided for the current sensor, so that the current sensor works normally and uploads corresponding messages for precision test and calibration; on the other hand, the power supply voltage can be separated from the working voltage range, so that the product is in undervoltage, normal and overvoltage states and is used for testing the working state of the current sensor in an extreme power supply environment.
6. Current transformer (lyme) (6): the current sensor is connected in the copper bar (9) in series with the current sensor and used for monitoring the current in the environment current, and the current sensor is used for collecting and calculating the current sensor and is a standard matching piece of the current sensor.
7. Program-controlled voltmeter (7): and the universal meter is connected with the current transformer (6) and is used for displaying the value of the current transformer. The relationship between the display value and the actual ambient current is: 1:2000, i.e. the actual ambient current 2000A, the multimeter acquisition is 1A.
8. High voltage direct current contactor (8): in the fitting test process, the output of the current sensor under different positive and negative directions of the ambient current needs to be collected. The contactor is used for switching the forward direction and the reverse direction of the ambient current.
9. Copper bar (9): the fitting test environment is provided for testing the cable and is used for connecting a direct current source and a load in series.
PC (personal computer) monitor: the system is an upper computer and is used for data acquisition, calculation, processing and recording of the sub-equipment.
When a plurality of current sensors are tested at the same time, as shown in fig. 4, the system is used for collecting test current values output by the plurality of current sensors through the CAN collection box (3) and sending the test current values to the upper computer. Meanwhile, a controllable voltage source (5) is utilized to provide test voltages with different magnitudes for the current sensor to be tested, so that the relevant performance of the current sensor under various extreme voltage environments is measured. The system also collects the internal working current of the current sensor through a multipath collector.
The output related data during the test are shown in table 1.
Table 1 test data
A second embodiment of the present invention relates to a current sensor testing method applied to a system as described above, as shown in the figure, comprising the steps of:
s0. adjusting the ambient current to a set point;
s1, selecting a current measurement range of a program-controlled universal meter according to the magnitude of an environmental current;
s2, acquiring a test current value acquired by a current sensor to be tested and a standard current value acquired by a test reference module;
s3, repeating the steps S0-S2 until a preset number of test current values and standard current values under different current measurement ranges are obtained;
s4, fitting correction parameters under different current measurement ranges by using a least square method according to the test current value and the standard current value, and calibrating the current sensor to be tested by using the correction parameters.
During specific test, the direction of the environmental current can be regulated by using the direct current contactor, and test current values and standard current values in different directions are collected.
And after the step S4, testing the calibrated current sensor under different voltage environments, comparing the calibrated current sensor with a standard current value, and judging whether the fitting is successful or not.
When using the least squares method to fit the correction parameters, this can be achieved by:
setting x i To test the current value, y i For the standard current value, a best fit curve with a preset number of n points needs to be found, wherein i is more than or equal to 1 and less than or equal to n;
for each (x i ，y i ) Calculate x i 2 And x i y i ；
All x i 、y i 、x i 2 And x i y i Adding to obtain And->
Calculating intercept b
Calculating slope a
And calibrating the current sensor to be tested by using the slope a and the intercept b.
When the calibration is carried out, a plurality of groups of slopes a and intercepts b are fitted according to the selected measuring range, and all the slopes a and intercepts b are written into the current sensor to be measured, so that the calibration process is completed. For example, a measuring range R1 of the multimeter can be selected when the ambient current is less than or equal to 90A, related current data can be collected and calculated to obtain a slope a1 and an intercept b1, and a measuring range R2 of the multimeter can be selected when the ambient current is greater than 90A, related current data can be collected and calculated to obtain a slope a2 and an intercept b2. And writing all the slope a1, the intercept b1, the slope a2 and the intercept b2 into the current sensor to be measured, and completing calibration. The multimeter has different acquisition precision under different measuring ranges, so the method ensures that more accurate standard current values can be obtained under different environment currents, and further more accurate calibration results are obtained.
Claims (10)
1. A current sensor testing system, comprising:
the adjustable current source is connected with the test cable in series and is used for providing environment current;
the current sensor to be tested is used for detecting the environment current to output a test current value;
the test reference module is used for monitoring the environment current output standard current value;
the industrial control module is used for controlling the adjustable current source to output the environment currents with different magnitudes, further collecting the test current values and the standard current values under different environment currents, and obtaining a test result after comparison analysis.
2. The system of claim 1, wherein the test reference module comprises a current transformer that nests into the test cable for monitoring the ambient current to obtain a standard current value.
3. The system of claim 2, wherein the test reference module further comprises a programmable multimeter for reading the standard current value and uploading to the industrial control module.
4. The system of claim 1, wherein the adjustable current source comprises a direct current source and an adjustable load in series with the direct current source and the test cable, respectively, the adjustable load being configured to adjust the magnitude of the ambient current in response to a control signal from the industrial control module.
5. The system of claim 1, further comprising a dc contactor interposed between the adjustable current source and the test cable for adjusting the direction of the ambient current.
6. The system of claim 1, further comprising a controllable voltage source for providing test voltages of different magnitudes to the current sensor under test.
7. The system of claim 1, further comprising an operating current collector in series with the current sensor to be measured for collecting an internal operating current of the current sensor.
8. The system of claim 1, wherein the current sensor to be measured comprises a plurality of current sensors, the industrial control module comprises a CAN acquisition box and an upper computer, the CAN acquisition box is used for acquiring the test current values output by the plurality of current sensors and sending the test current values to the upper computer, and the correction parameters after fitting by the upper computer are sent to the current sensors for calibration.
9. A method of testing a current sensor for use in a system as claimed in claims 1-8, comprising the steps of:
s0. adjusting the ambient current to a set point;
s1, selecting a current measurement range of a program-controlled universal meter according to the magnitude of the environmental current;
s2, acquiring a test current value acquired by a current sensor to be tested and a standard current value acquired by a test reference module;
s3, repeating the steps S0-S2 until the preset number of the test current values and the standard current values under different current measuring ranges are obtained;
s4, fitting correction parameters under different current measurement ranges by using a least square method according to the test current value and the standard current value, and calibrating the current sensor to be measured by using the correction parameters.
10. The method according to claim 9, further comprising the step of adjusting the direction of the ambient current using a direct current contactor and collecting the test current value and the standard current value in different directions before step S3.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118425868A (en) * | 2024-07-02 | 2024-08-02 | 深圳市艾华迪技术有限公司 | Electric performance test system and test method for current sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118425868A (en) * | 2024-07-02 | 2024-08-02 | 深圳市艾华迪技术有限公司 | Electric performance test system and test method for current sensor |
| CN118425868B (en) * | 2024-07-02 | 2024-09-20 | 深圳市艾华迪技术有限公司 | Electric performance test system and test method for current sensor |
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