基于隧道磁阻传感器的电流测试电路设计

Design of Current Test Circuit Based on Tunnel Magnetoresistance Sensor

智能电网的发展给电流测试技术提出了更高的要求,为实现待测电流的准确测试,提出使用2个敏感面相反的隧道磁阻传感器进行测试。在完成检测模型搭建、测试电路参数确定、Multisim仿真,以及调理电路设计的基础上,对微电网中的待测电流进行测试,并对处理后的测试信号进行误差计算。试验结果表明,所设计的电路可以完成电流测试;所测信号经过处理,测试误差由单个传感器的0.42%降至处理后的0.04%。该电路的设计对基于隧道磁阻传感器的电流测试具有一定的参考价值。

The development of smart grid puts forward higher requirements for current test technology,in order to realize the accurate test of the current to be measured,It is proposed to use two tunnel magnetoresistance sensors with opposite sensitive surfaces for test.On the basis of the completion of detection model building,test circuit parameter determination,Multisim simulation and conditioning circuit design,the current to be measured in microgrid is tested,and the error of the processed test signal is calculated.The experimental results show that:the designed circuit can complete the current test.After processing the measured signal,the test error decreases from 0.42%of single sensor to 0.04%of processed one.The design of the circuit has a certain reference value for the current test based on the tunnel magnetoresistance sensor.