基于Multisim的磁通门式电流互感器解调电路的仿真研究  

Simulation research of demodulation circuit of fluxgate current transformer based on Multisim

作　　者：杨钰炜 迟长春(指导)[1] 卢志军 YANG Yuwei;CHI Changchun;LU Zhijun(School of Electrical Engineering,Shanghai Dianji University,Shanghai 201306,China)

机构地区：[1]上海电机学院电气学院,上海201306

出　　处：《上海电机学院学报》2023年第4期220-225,共6页Journal of Shanghai Dianji University

摘　　要：为滤除剩余电流中的高频信号,提高剩余电流的检测精度,研究了一种基于Multisim的磁通门式电流互感器的解调电路。通过五阶巴特沃斯低通滤波器对电流信号进行滤波解调,滤除高频信号,并进一步采用平均值间接测量法求得电流信号的有效值。五阶巴特沃斯低通滤波器由多端反馈的二阶低通滤波器构成,省去了放大电路。通过Multisim仿真验证了该解调电路的可行性,对各种典型的剩余电流进行了检测实验。结果表明:该解调电路能有效滤除剩余电流中的高频分量,降低生产成本,提高检测精度。In order to filter the high-frequency signal and improve the detection accuracy of residual current,a demodulation circuit of fluxgate current transformer based on Multisim is studied.The current signal is filtered and demodulated by the fifth-order Butterworth low-pass filter,and the high-frequency signal is filtered out.The effective value of the current signal is obtained by using the indirect measurement method of average value.The fifth-order Butterworth low-pass filter consists of second-order low-pass filters with multi-terminal feedback,and the amplifier circuit can be ignored.The feasibility of the demodulation circuit is verified by the Multisim simulation,and the detection experiments of various typical residual currents are carried out.The results show that the demodulation circuit can effectively filter the high-frequency components of the residual current,reduce production costs,and improve detection accuracy.

关 键 词：电流互感器 剩余电流检测 间接测量 巴特沃斯低通滤波器 

分 类 号：TM561[电气工程—电器]