基于环形阵列TMR的电流传感器抗干扰原理研究

Research on Anti-Interference Principle of Current Sensor Based on Circular Array of TMR

针对基于隧道磁阻(Tunnel Magnetoresistance,TMR)的电流传感测量技术,文章分析了影响环形阵列结构测量性能的因素,给出了其抗干扰原理并证明了实际效果,为智能隧道磁阻电流传感器的研制与在电力系统应用打下理论基础。首先研究了环形TMR阵列的测量原理,然后针对串扰、偏心、偏角、地磁因素,系统地研究了其对测量误差的影响,构建了误差模型;最后制作试验样机及搭建测试平台,并对其测量性能进行测试。文章形成了环形阵列TMR的电流传感器基本设计原则,能为其进一步在电力系统中的应用提供理论基础。

This paper analyzes the factors that affect the measurement performance of the ring array structure based on the tunnel magnetoresistance(TMR)current sensing measurement technology and presents corresponding anti-interference principle and proves the actual effect.It is the theoretical foundation to research the intelligent tunnel magnetoresistance current sensor in the application of power systems.First,the measurement principle of the ring TMR array is studied.Then,the influence of crosstalk,un-centeredness,un-perpendicularity,and geomagnetic factors on the measurement error is systematically studied,and an error model is constructed.Finally,the test prototype and platform are built for testing its measurement performance.This paper has formed the basic design principles of the current sensor of the ring array TMR,which can provide a theoretical basis for its further application in power system.