CN211653115U - Automatic calibration system for digital current sensor - Google Patents
Automatic calibration system for digital current sensor Download PDFInfo
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- CN211653115U CN211653115U CN201922276052.2U CN201922276052U CN211653115U CN 211653115 U CN211653115 U CN 211653115U CN 201922276052 U CN201922276052 U CN 201922276052U CN 211653115 U CN211653115 U CN 211653115U
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Abstract
The utility model discloses an automatic calibration system of a digital current sensor, which comprises a computer, a plurality of serial servers, a current standard source, a current standard meter, a digital current sensor and a current switching device, wherein the computer is respectively electrically connected with the current standard source, the current standard meter, the digital current sensor and the current switching device through the plurality of serial servers, the current switching device is respectively and bidirectionally connected with the current standard source, the current standard meter and the digital current sensor, the current switching device can switch a current loop, so that the current switching device works in a current positive sequence mode, the current standard meter and the digital current sensor can respectively identify the current value output by the current standard source and transmit the identified value to automatic calibration software in the computer through the plurality of serial servers, and after calculation, writing the calculated standard parameters into the digital current sensor, and calibrating the digital current sensor.
Description
Technical Field
The utility model relates to a digital current sensor field especially relates to a digital current sensor automatic calibration system.
Background
Under the rapid development stage of the new energy automobile industry and the mature market application of the lithium battery system, the market demand of the digital current sensor is large. However, in the field of precise current sensors, a large amount of manual operations, low working efficiency and complex calibration links exist in the conventional high-precision instrument and meter when the digital current sensor is calibrated, errors easily occur in the manual operations, so that the calibration errors of the digital current sensor are large, and based on the current situation, a calibration system with high automation degree is urgently needed to be researched and developed, the operation is simple, and the situation that the calibration errors occur due to the manual operations can be avoided.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model discloses a digital current sensor automatic calibration system can avoid the problem of human error in traditional calibration mode, and then can improve the calibration accuracy.
The utility model discloses a digital current sensor automatic calibration system, including computer, multichannel serial servers, current standard source, current standard table, digital current sensor and current switching device, the computer passes through multichannel serial servers respectively with the current standard source the current standard table digital current sensor and current switching device electric connection, current switching device respectively with the current standard source the current standard table and digital current sensing both way junction.
Further, the current switching device comprises a communication module, a control module, a current loop switching module, a standard source current input/output terminal, a standard meter current input/output terminal and a digital current sensor current input/output terminal, the computer is connected with the communication module through the multi-path serial server, the communication module is connected with the current loop switching module through the control module, the current loop switching module is connected with the current standard source through the standard source current input/output terminal, the current loop switching module is connected with the current standard meter through the standard meter current input/output terminal, and the current loop switching module is connected with the digital current sensor through the digital current sensor current input/output terminal.
Further, an input interface of the multi-path serial port server is ethernet, and an output interface is RS 232.
The technical scheme of the utility model, compared with the prior art, beneficial effect is:
connecting a current line to enable the current switching device, the digital current sensor, the current standard meter and the current standard source to be located on the same current loop, sending an instruction to the current switching device by automatic calibration software in the computer through the multi-path serial server, and enabling the current switching device to control the current switching loop to enable the current switching device to work in a current positive sequence mode; and then the automatic calibration software in the computer sends an instruction to the current standard source through a multi-channel serial server, the current standard source outputs a current value, the current standard table and the digital current sensor identify and calculate the value, the identified value is transmitted to the automatic calibration software in the computer through the multi-channel serial server, after calculation, the calculated standard parameter is written into the digital current sensor to calibrate the digital current sensor, errors caused by manual operation are avoided, and the calibration precision is improved.
Drawings
FIG. 1 is a block diagram of the structure of the modules of the automatic calibration system;
FIG. 2 is a block diagram of the structure of the current switching device;
description of the figures
100. Automatically calibrating the system; 10. a computer; 20. a multi-channel serial server; 30. a current switching device; 31. a communication module; 32. a control module; 33. a current loop switching module; 34. a standard source current input-output terminal; 35. a standard meter current input/output terminal; 36. a digital current sensor current input/output terminal; 40. a current standard source; 50. a current standard table; 60. the digital current sensor.
Detailed Description
In order to make the present invention clearer, the technical solutions in the embodiments of the present invention will be described in detail and completely with reference to the drawings in the embodiments of the present invention, it should be noted that when one component is considered to be "connected" to another component, it may be directly connected to another component or intervening components may be present. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
As shown in fig. 1, the utility model discloses a digital current sensor automatic calibration system 100 can carry out the automatic calibration to digital current sensor comparatively accurately, has avoided the manual operation to make the calibration error appear. The automatic calibration system 100 comprises a computer 10, a multi-channel serial server 20, a current switching device 30, a current standard source 40, a current standard meter 50 and a digital current sensor 60, wherein the current switching device 30, the digital current sensor 60, the current standard meter 50 and the current standard source 40 can be connected through current lines to form a current loop.
The computer 10 is internally provided with current automatic calibration software, and can send instructions to each module in the system through the multi-path serial server 20, and can also read and calculate the values detected by each module in the system. The computer 10 is connected to the current switching device 30, the current standard source 40, the current standard meter 50, and the digital current sensor 60 through the multi-channel serial server 20, and the current switching device 30 is bidirectionally connected to the current standard source 40, the current standard meter 50, and the digital current sensor 60, respectively.
As shown in fig. 2, in the present embodiment, the current switching device 30 includes a communication module 31, a control module 32, a current loop switching module 33, a standard source current input/output terminal 34, a standard meter current input/output terminal 35 and a digital current sensor current input/output terminal 36, the computer 10 is connected with the communication module 31 through the multi-way serial server 20, the communication module 31 is connected with the current loop switching module 33 through the control module 32, the current loop switching module 33 is connected to the current standard source 40 through the standard source current input output terminal 34, the current switching loop module 33 is connected to the current standard meter 50 through the standard meter current input/output terminal 35, the current loop switching module 33 is connected to the digital current sensor 60 through the digital current sensor current input/output terminal 36.
In this embodiment, the input interface of the multi-path serial server 20 is ethernet, and the output interface is RS 232.
The working steps are as follows:
the current lines are connected such that the current switching device 30, the current reference source 40, the current reference meter 50 and the digital current sensor 60 are on the same current path. The automatic calibration software in the computer 10 sends an instruction to the communication module 31 through the multi-channel serial server 20, the communication module 31 parses communication data and transmits the parsed signal to the control module 32, and the control module 32 performs a current switching loop through the current loop switching module 33, so that the current switching device 30 operates in a current positive sequence mode.
The auto-calibration software in the computer 10 then issues commands to the current standard source 40 through the multi-way serial server 20, and the current standard sourceThe current standard source 40 outputs a specified current value I1After the current output is stable, the current is respectively transmitted to the current standard meter 50 and the digital current sensor 60 through the current switching device 30, and the current standard meter 50 and the digital current sensor 60 respectively measure the current value I1Measuring calculation is carried out, and the automatic calibration software in the computer 10 reads the measured value of the current standard table 50 to obtain a standard reference current value Istd1(ii) a The automatic calibration software in the computer 10 reads the measurement value of the digital current sensor 60 to obtain the current measurement value Ireal1。
Then, the automatic calibration software in the computer 10 issues an instruction to the current standard source 40 through the multi-path serial server 20, and the current standard source 40 outputs a specified current value I2After the current output is stable, the current is transmitted to the current standard meter 50 and the digital current sensor 60 through the current switching device 30, and the current standard meter 50 and the digital current sensor 60 respectively aim at the I2Measuring calculation is carried out, and the automatic calibration software in the computer 10 reads the measured value of the current standard table 50 to obtain a standard reference current value Istd2(ii) a The automatic calibration software in the computer 10 reads the measurement value of the digital current sensor 60 to obtain the current measurement value Ireal2。
The auto-calibration software in the computer 10 uses the two-point calibration principle to calculate the data:
Istd1＝Ireal1×k+b......①
Istd2＝Ireal2×k+b......②
obtaining the following components by the following steps:
b＝Istd1-Ireal1×k......④
wherein k is a proportionality coefficient, and b is a zero offset value.
After the automatic calibration software in the computer 10 obtains k and b, the k and b are written into the digital current sensor through the multi-path serial server 20, so as to calibrate the digital current sensor 60.
The above disclosure is only for the specific embodiments of the present invention, but the present invention is not limited thereto, and any changes that can be considered by those skilled in the art should fall within the protection scope of the present invention.
Claims (3)
1. The automatic calibration system of the digital current sensor is characterized by comprising a computer, a plurality of serial servers, a current standard source, a current standard meter, a digital current sensor and a current switching device, wherein automatic calibration software in the computer is electrically connected with the current standard source, the current standard meter, the digital current sensor and the current switching device respectively through the plurality of serial servers, and the current switching device is in bidirectional connection with the current standard source, the current standard meter and the digital current sensor respectively.
2. The digital current sensor auto-calibration system of claim 1, the current switching device comprises a communication module, a control module, a current loop switching module, a standard source current input/output terminal, a standard meter current input/output terminal and a digital current sensor current input/output terminal, the computer is connected with the communication module through the multi-path serial server, the communication module is connected with the current loop switching module through the control module, the current loop switching module is connected with the current standard source through the standard source current input and output terminal, the current loop switching module is connected with the current standard meter through the current input and output terminal of the standard meter, the current loop switching module is connected with the digital current sensor through the current input and output terminal of the digital current sensor.
3. The automatic calibration system for the digital current sensor as claimed in claim 2, wherein the input interface of the multi-channel serial server is ethernet, and the output interface is RS 232.
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| CN201922276052.2U CN211653115U (en) | 2019-12-18 | 2019-12-18 | Automatic calibration system for digital current sensor |
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| CN201922276052.2U CN211653115U (en) | 2019-12-18 | 2019-12-18 | Automatic calibration system for digital current sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112285635A (en) * | 2020-12-29 | 2021-01-29 | 武汉中原电子信息有限公司 | Terminal correction method and system of external current transformer |
| CN115308664A (en) * | 2022-10-10 | 2022-11-08 | 苏州矩阵光电有限公司 | Calibration device and method of Hall current sensor |
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2019
- 2019-12-18 CN CN201922276052.2U patent/CN211653115U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112285635A (en) * | 2020-12-29 | 2021-01-29 | 武汉中原电子信息有限公司 | Terminal correction method and system of external current transformer |
| CN115308664A (en) * | 2022-10-10 | 2022-11-08 | 苏州矩阵光电有限公司 | Calibration device and method of Hall current sensor |
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