TMR传感器阵列测量电流的新型拓扑研究  

New Topological Study of Current Measurement by TMR Sensor Array

作　　者：周秀 吴旭涛 周童浩 罗艳 田天 李秀广 汲胜昌[2] ZHOU Xiu;WU Xutao;ZHOU Tonghao;LUO Yan;TIAN Tian;LI Xiuguang;JI Shengchang(Electric Power Research Institute of State Grid Ningxia Electric Power Company Limited,Yinchuan 750001,China;State Key Laboratory of Electrical Insulation and Power Equipment,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]国网宁夏电力有限公司电力科学研究院,银川750001 [2]西安交通大学电力设备电气绝缘国家重点实验室,西安710049

出　　处：《高压电器》2022年第6期228-236,共9页High Voltage Apparatus

基　　金：宁夏回族自治区重点研发计划(2020BDE13033);国网宁夏电力有限公司科技项目(5229DK190051)。

摘　　要：通过传感器阵列和相应的算法减小乃至消除外部干扰电流产生的串扰误差是磁传感器电流测量技术研究中的一个重要问题。文中在对比了现有拓扑结构后,提出了一种双层环形传感器阵列拓扑结构,并对其测量误差进行了仿真计算与实验测量。仿真计算中对比了干扰电流的大小、相位、距离,以及被测导体偏离阵列中心等因素对测量误差的影响。利用8个高灵敏度的隧道磁阻(tunnel magnetoresistance,TMR)元件制作了电流传感器,并在单导体干扰和多导体干扰下进行了测试,实验结果表明其平均误差为1.79%,相对于单层四传感器的方法减小了约7%的误差。相比于其他拓扑结构,文中提出的结构抗干扰能力强,且无需复杂的算法,仅需基本的运算电路即可实现功能,具有较强的实用价值。Reduction and even elimination of crosstalk error due to external interference current by the sensor array and corresponding algorithms is an important issue of current measurement technology of in the research of magnetic sensor.In this paper,a kind of double⁃layer annular sensor array topology is proposed after comparing the existing ty⁃pologies,and the measurement error is performed by simulation calculation and experimental measurement.In the simulation and calculation,the influence of such factor as amplitude,phase,distance of the interference current and the deviation of the measured conductor on the measurement error is compared.The current sensor is fabricated by using eight high⁃sensitivity TMR elements and tested under single and multi⁃condctor interference.The experimental results show that the average error of the current sensor is about 1.79%,which reduces by about 7%compared with the single⁃layer four sensors method.The topology proposed in this paper,compared with other typologies,has strong anti⁃interference ability.The function can be achieved not by complicated algorithm but basic calculation cir⁃cuit.Therefore,it has strong practical value.

关 键 词：电流测量 串扰误差 传感器阵列拓扑 干扰抑制 隧道磁阻传感器 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TM933.1[自动化与计算机技术—控制科学与工程]