基于周向阵列的TMR电流传感器测量方法  

Measurement method of TMR current sensor based on circular array

作　　者：牟宏杰 许涛 钟贻兵 关业辉 MOU Hongjie;XU Tao;ZHONG Yibing;GUAN Yehui(Shandong Institute of Space Electronic Technology,Yantai 264003,China)

机构地区：[1]山东航天电子技术研究所,山东烟台264003

出　　处：《传感器与微系统》2022年第8期108-111,共4页Transducer and Microsystem Technologies

基　　金：中央军委装备发展部资助项目(2006ZYGY0416)。

摘　　要：针对传统单隧道磁电阻(TMR)传感器在测量电流时由于偏心造成精度下降以及抗磁场干扰能力差,无法满足电流监测的高精度需求的问题,提出一种周向阵列分布的TMR电流传感器测量方法。构建TMR元件排布数学模型,分析TMR元件数量以及载流导体偏心对测量精度的影响。设计了一种16-TMR传感器周向阵列排布方案,增强传感器抗外磁场干扰能力,并设计加法平均电路对多路测量值做算术平均计算,消除单个TMR元件测量误差大的影响。Ansys磁场仿真结果和工程样机测试结果表明:16-TMR周向阵列TMR电流传感器测量方法线性度优于0.1%,精度优于0.2%,较传统霍尔传感器测量方法,其体积小,功耗低,易于集成,测量精度高,具有重要的工程应用价值。Aiming at the problem that traditional single tunneling magnetic resistance(TMR)sensor can not meet the high precision requirement of current monitoring due to eccentricity and poor resistance to magnetic field interference,a measurement method of TMR current sensor based on circular array is proposed.The mathematical model of TMR component arrangement is established to analyze the influence of TMR component number and conductor eccentricity on measurement precision.A 16-TMR circular array scheme is designed to enhance the ability to resist external magnetic field interference.An addition circuit is designed to calculate the arithmetic average value of multi-channel measurement for eliminating the influence of large measurement error of single TMR element.The results of Ansys magnetic field simulation and engineering prototype test result show that the linearity of the method is prior to 0.1%,and the precision is prior to 0.2%.Compared with traditional Hall sensor measurement method,it has small volume,low power consumption,easy for integration,high measurement precision and important engineering application value.

关 键 词：周向阵列 隧道磁电阻 电流传感器 电流测量方法 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]