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Current measuring device, method and storage medium

A technology of current measurement device and current source, applied in the direction of measurement device, only current measurement, measurement of electrical variables, etc., can solve the problems of inability to quantitatively calculate tunneling magnetoresistance, different chip output results, and deviation of measurement results.

Active Publication Date: 2022-05-06
CHINA SOUTHERN POWER GRID DIGITAL GRID RES INST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the resistance value of tunneling magnetoresistance is related to temperature and cannot be quantitatively calculated. Therefore, in different scenarios, when the applied magnetic field is zero, the output results of the TMR chip are different, resulting in a certain deviation in the final measurement results.

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  • Current measuring device, method and storage medium
  • Current measuring device, method and storage medium
  • Current measuring device, method and storage medium

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Embodiment Construction

[0046] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the application are given in the drawings. However, the present application can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of this application more thorough and comprehensive.

[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 only for the purpose of describing specific embodiments, and are not intended to limit the application.

[0048] It can be understood that the terms "first", "second" and the like used in this application may be...

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Abstract

The present application relates to a current sensor, a current measuring device, a method and a storage medium. The current sensor includes: 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 to the coil for the current When the sensor is in the calibration mode, the detection current is provided; the TMR chip is located in the gap, and is used for measuring the magnetic induction intensity of the surrounding environment. The corresponding data is acquired by the current sensor, and then the zero drift of the TMR chip can be accurately determined according to the acquired data, so as to correct the measurement error caused by the zero drift of the TMR chip and improve the measurement accuracy of the TMR chip.

Description

technical field [0001] The present application relates to the technical field of current measurement, in particular to a current measurement device, method and storage medium. Background technique [0002] At present, current transformers based on the principle of electromagnetic coupling are mainly used to measure current. The disadvantage of this sensor is that it is bulky and expensive. It must prevent the iron core from saturating and cannot measure high-frequency currents. [0003] Therefore, in recent years, magnetoresistance effect sensor chips have been continuously introduced and applied in the field of power system measurement, especially tunnel magnetoresistance (TMR) chips, which have unique advantages such as large magnetoresistance effect and high magnetic field sensitivity. [0004] However, the resistance value of tunneling magnetoresistance is related to temperature and cannot be quantitatively calculated. Therefore, in different scenarios, when the external...

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Application Information

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Patent Type & Authority Patents(China)
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