Design of open-close zero-flux current sensor based on TMR

SUN Xuehang; LIU Jizhi; XIE Zhiyuan; LIU Cong; RONG Song

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Design of open-close zero-flux current sensor based on TMR

Design & Manufacture | 更新时间：2026-07-20

- Design of open-close zero-flux current sensor based on TMR
- Vol. 45, Issue 7, Pages: 104-109(2026)
- 作者机构：
  
  1. 华北电力大学电子与通信工程系,河北,保定,071003
  2. 河北省互感器技术创新中心,河北,保定,071003
- 作者简介：
- 基金信息：
- DOI：
  CLC： TP212;TM933
- Published：2026
- 稿件说明：
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SUN Xuehang, LIU Jizhi, XIE Zhiyuan, et al. Design of open-close zero-flux current sensor based on TMR[J]. 2026, 45(7): 104-109.
DOI：

SUN Xuehang, LIU Jizhi, XIE Zhiyuan, et al. Design of open-close zero-flux current sensor based on TMR[J]. 2026, 45(7): 104-109. DOI：

摘要

为了满足直流电流在线计量或检测需求，以隧穿磁阻(TMR)技术为基础，采用闭环零磁通方案设计了一种开合式电流传感器。详细分析了传感器磁芯结构设计、磁感应元件以及信号处理电路，分析了传感器的抗干扰设计。对传感器进行了详细测试，测试结果表明，所设计的传感器能够满足0~50A量程，电流传感器测量精度优于±1%，分辨率优于50mA。所设计的传感器具有良好线性度，高稳定性，以及较强的抗强磁干扰能力，能够有效减小外部恶劣环境对于电流计量的影响，为直流系统电流在线监测和精确计量提供了可行方案。

Abstract

In order to meet the requirements of online DC measurement or detection

an open-close current sensor based on tunneling magnetoresistance (TMR) technology is designed using closed-loop zero-flux scheme.The magnetic core structure design

magnetic sensing components and signal processing circuits of the sensor are analyzed in detail

and the anti-interference design of the sensor is analyzed.Detailed tests are carried out on the sensor. The test results show that the designed sensor can meet the range of 0~50A

the measurement accuracy of the current sensor is better than ±1%

and the resolution is better than 50mA.The designed sensor has good linearity

high stability and strong anti-strong magnetic interference ability

which can effectively reduce the influence of harsh external environment on current measurement

and provide a feasible scheme for current online monitoring and accurate measurement of DC system.

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