Design and Noise Analysis of Weak Current Sensor with Broadband Based on Tunneling Magnetoresistance Effect

HU Jun; WANG Bo; SHENG Xinfu; ZHAO Gen; ZHAO Shuai; HE Jinliang

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Design and Noise Analysis of Weak Current Sensor with Broadband Based on Tunneling Magnetoresistance Effect

更新时间：2025-12-08

- Design and Noise Analysis of Weak Current Sensor with Broadband Based on Tunneling Magnetoresistance Effect
- Vol. 46, Issue 7, Pages: 2545-2553(2020)
- 作者机构：
  
  清华大学电机工程与应用电子技术系电力系统及发电设备控制和仿真国家重点实验室
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：31 July 2020，
  
  Published：2020
- 稿件说明：
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HU Jun, WANG Bo, SHENG Xinfu, et al. Design and Noise Analysis of Weak Current Sensor with Broadband Based on Tunneling Magnetoresistance Effect[J]. 2020, 46(7): 2545-2553.
DOI：

HU Jun, WANG Bo, SHENG Xinfu, et al. Design and Noise Analysis of Weak Current Sensor with Broadband Based on Tunneling Magnetoresistance Effect[J]. 2020, 46(7): 2545-2553. DOI：

摘要

针对电网中微弱电流的测量需求

研制了基于隧穿磁阻效应的百μA级无接触式微电流传感器

并对微电流传感器进行低噪声设计

包括电源模块、放大模块、调零和输出模块。测试了采用不同传感芯片传感器的微弱电流探测能力

其最小可测电流幅值为280μA

对应传感器的带宽达10 kHz。并对传感器系统各模块的噪声水平进行了测量分析与计算

结果表明隧穿磁阻芯片的1/f噪声（低频噪声）是限制传感器最小可测电流幅值的主要因素。该微电流传感器可以适应智能电网微弱电流测量需求。

Abstract

According to the demands of measuring weak currents in smart grids

the contactless wideband weak current sensors with the amplitude of several hundred μA based on tunneling magnetoresistance（TMR） effect were studied. The weak current sensors were specially designed for lower noise

including power module

amplifier module

zero setting module

and output module. The various characteristics of the weak current sensors with different sensing chips were measured

which indicated that the minimum measurable amplitude could be as small as 280 μA with a bandwidth of up to 10 kHz. After measuring and analyzing the noise levels of different modules of the sensor

it is concluded that the 1/f noise（low frequency noise） of the TMR chip is the main factor limiting the minimum measurable current value of a sensor. Overall

the proposed weak current sensors are adapted to the actual measurement requirements in smart grids.

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Related Author

HU Jun

ZHAO Shuai

OUYANG Yong

HE Jinliang

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LI Changheng

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Related Institution

State Key Lab of Control and Simulation of Power Systems and Generation Equipments, Department of Electrical Engineering,Tsinghua University

Stanford University Center for Magnetic Nanotechnology

China Electric Power Research Institute

State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University

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