Current sensor, current measuring device, current measuring method and storage medium
A current measurement device and current sensor technology, applied in the field of current measurement devices and current sensors, can solve problems such as different chip output results, deviation of measurement results, and inability to quantitatively calculate tunneling reluctance.
Active Publication Date: 2021-12-28
CHINA SOUTHERN POWER GRID DIGITAL GRID RES INST CO LTD
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[0004] However, the resistance value of tunneling magnetoresistance is related to temperature and cannot be quantitatively calculated. Therefore, in different scenarios, when the external magnetic field is zero, the chip output results of the TMR chip are different, resulting in certain deviations in the final measurement results.
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[0046] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the related drawings. Embodiments of the present application are presented in the accompanying drawings. However, the application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used herein in the specification of the application are for the purpose of describing particular embodiments only and are not intended to limit the application.
[0048]It can be understood that the terms "first", "second", etc. used in the present application may be used herein to describe vario...
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The invention relates to a current sensor, a current measuring device, a current measuring method and a storage medium. The current sensor comprises an annular magnetic core with a gap, a coil, a current source and a TMR chip, the coil is wound on the annular magnetic core; the current source is connected with the coil and is used for providing detection current when the current sensor is in a calibration mode; and the TMR chip is located in the notch and used for measuring the magnetic induction intensity of the environment where the TMR chip is located. The current sensor is used for acquiring corresponding data, and then the null drift of the TMR chip can be accurately determined according to the acquired data, so that the measuring error caused by the null drift of the TMR chip is corrected, and the measuring accuracy of the TMR chip is improved.
Description
technical field [0001] The present application relates to the technical field of current measurement, and in particular, to a current sensor, a current measurement device, a method and a storage medium. Background technique [0002] At present, the current measurement mainly adopts the current transformer based on the principle of electromagnetic coupling. The disadvantage of this sensor is that it is bulky and expensive, must prevent the iron core from saturation and cannot measure high-frequency current. [0003] Therefore, in recent years, sensor chips with magnetoresistance effect have been continuously introduced and applied in the field of power system measurement, especially Tunnel Magnetoresistance (TMR) chips. TMR chips have the unique advantages of large magnetoresistance effect and high sensitivity to magnetic fields. [0004] However, the resistance value of tunneling magnetoresistance is related to temperature and cannot be calculated quantitatively. Therefore, ...
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IPC IPC(8): G01R19/00G01R35/00
CPCG01R19/0092G01R35/005G01R35/007
Inventor 李鹏田兵吕前程刘仲骆柏锋尹旭张佳明
Owner CHINA SOUTHERN POWER GRID DIGITAL GRID RES INST CO LTD