Wide-range current measurement method and device based on closed-loop feedback, and current sensor

A closed-loop feedback and current measurement technology, which is applied in the direction of measuring devices, measuring current/voltage, measuring electrical variables, etc., can solve the problem of small range of TMR chips, and achieve the effect of widening the current detection range and high detection accuracy

Active Publication Date: 2022-05-13
CHINA SOUTHERN POWER GRID DIGITAL GRID RES INST CO LTD
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Problems solved by technology

However, in the face of the very wide current working range of the power system, the TMR chip has the problem of too small range

Method used

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  • Wide-range current measurement method and device based on closed-loop feedback, and current sensor
  • Wide-range current measurement method and device based on closed-loop feedback, and current sensor
  • Wide-range current measurement method and device based on closed-loop feedback, and current sensor

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Embodiment Construction

[0021] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.

[0022] An embodiment of the present invention provides a closed-loop feedback-based wide-range current measurement method, which is used to control the current sensor to measure the current of the wire to be measured. see figure 1 , the current sensor includes a magnetic gathering ring 11 , a single-axis TMR chip 13 and a current generating module 15 . The magnetic gathering ring 11 includes an air gap and an excitation coil. The wire to be tested passes through the magnetism gathering ring 11 . The current generation module is used to output excitation current to the e...

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Abstract

The invention relates to a wide-range current measurement method and device based on closed-loop feedback, and a current sensor. The current sensor comprises a magnetism gathering ring, a single-axis TMR chip and a current generation module. A wire to be measured penetrates through the magnetism gathering ring, the uniaxial TMR chip is arranged in an air gap of the magnetism gathering ring and used for outputting a voltage signal, the current generation module is used for outputting excitation current to an excitation coil of the magnetism gathering ring, and the direction of the magnetic field intensity generated by the excitation current in the air gap is opposite to the direction of the magnetic field intensity generated by the current of the wire to be measured in the air gap. The method comprises: acquiring a voltage signal; under the condition that the single-axis TMR chip works in a linear region, the current of the wire to be measured is obtained according to the voltage signal; and under the condition that the single-axis TMR chip works in the non-linear region, the exciting current is increased, so that the single-axis TMR chip works in the linear region, and the current of the wire to be measured is obtained according to the voltage signal and the exciting current. The current detection range is widened on the basis of high-precision current detection.

Description

technical field [0001] The present application relates to the technical field of electric power measurement, in particular to a closed-loop feedback-based wide-range current measurement method, device, current sensor and computer storage medium. Background technique [0002] Current and voltage are the most important operating status data of the power system. How to obtain current and voltage data has always been an important research topic in the power system. With the maturity of MEMS (Micro-Electro-Mechanical System, micro-electromechanical system) preparation technology, the magnetic field sensor chip based on MEMS technology has brought new means to non-invasive current measurement. At present, the non-contact current measurement technology basically restores the measured current information indirectly by measuring the magnetic field generated by the measured current. According to the measurement principle, it can be roughly divided into: electromagnetic induction type,...

Claims

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Application Information

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IPC IPC(8): G01R19/00G01R15/20
CPCG01R19/0092G01R15/205
Inventor 吕前程李鹏田兵聂少雄王志明孙宏棣林跃欢林力林秉章李立浧
Owner CHINA SOUTHERN POWER GRID DIGITAL GRID RES INST CO LTD
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