摘要
简要介绍了共模、差模及非对称的测试电路,但都无法精准测量 EMI 滤波器的插入损耗。因此提出一种基于共差模分离器的测量电路,来精准测量插入损耗,并进行了实验验证及分析。该方案弥补了GB/T 7343-2017中测试方法的不足,并为滤波器内部电路存在的漏感现象、分布参数等对插入损耗的影响提供了测量方法。
The common mode,differential mode and asymmetric test circuits are introduced briefly,but the insertion loss of EMI filter can not be measured accurately.Therefore,a filter circuit based on the common differential mode separator is proposed to accurately measure the insertion loss,which is verified and analyzed by experiments.This scheme can make up for the shortcomings of the test methods in GB/T 7343-2017,and provide a measurement method for the leakage phenomenon in the internal circuit of the filter and the influence of the distributed parameters on the insertion loss.
关键词
四端网络
共模插入损耗
差模插入损耗
共差模分离器
功率分配器
four-terminal network
common mode insertion loss
differential mode insertion loss
common differential mode separator
power splitter
