基于双轴各向异性磁阻传感器电流测量系统的研究

Research of Current Measurement System Based on Two-axis Anisotropic Magnetoresistive Sensor

根据各向异性磁阻传感器(AMR)测量导线产生磁场强度的原理,利用两个双轴各向异性磁阻传感器建立虚拟等腰直角三角形结构的理论模型,并提出计算虚拟等腰直角三角形中任意位置的定位算法,实现对电流的非接触式测量。建立传感器单元和测试平台,设计Kaiser窗函数和卡尔曼滤波器处理外部磁场的影响。最后通过实验验证了提出结构、定位算法和信号处理的正确性。

According to the measurement principle of magnetic field generated by wires using anisotropic magnetoresistive(AMR)sensor,two two-axis AMR sensors were utilized to establish a theoretical model of virtual isosceles right triangular structure,and a positioning algorithm is proposed to calculate any position in the virtual isosceles right triangle.In this way,a contactless method for current measurement can be achieved.A sensor unit and a test platform were built,and Kaiser window function and Kalman filter were specially designed to eliminate the influence of external magnetic field.Finally,the correctness of the proposed structure,positioning algorithm,and signal processing were verified through experiments.