Abstract：Electromagnetic interference (EMI) filters play an important role in restraining conducted EMI. Affected by the impedance of the noise source and the load, the performance of the EMI filter is often poor. In order to eliminate the adverse effect, the design method of an EMI filter network with the impedance mismatching network is proposed in this paper. According to the value of the impedance of the noise source and the load, the impedance mismatching network will be classified into two kinds: the L-type network and the C-type network. By selecting the appropriate parameters of the impedance mismatching network, the noise source impedance and the input impedance of the EMI filter will meet some proportion, and the load impedance and the output impedance of the EMI filter will also meet some proportion. Using the characteristics that different impedance proportions have different values of reflection loss, the optimized running state of the EMI filter will be achieved. Besides the insertion loss, the reflection loss is also supplied by the EMI filter network and the performance of the EMI filter will be further improved. In order to reduce the volume of the EMI filter, the design method of the EMI filter network is applied to the planar EMI filter. Finally, an experiment is taken to verify the effectiveness and feasibility of the EMI filter network.
宋峥, 王世山. EMI滤波器网络最佳工作状态设计及其平面化实现[J]. 电工技术学报, 2016, 31(7): 179-187.
Song Zheng, Wang Shishan. The Design of the Optimized Running State of EMI Filter Network and Its Planar Realization. Transactions of China Electrotechnical Society, 2016, 31(7): 179-187.
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2016, Vol. 31 
