2009•Advanced Technology of Electrical Engineering and EnergyRequires access

Near field effect analysis and common mode conducted EMI model of a switched mode power supply

Junping He, Zheng Bao-tang, Yi Wang

Abstract

In this paper,the electromagnetic near field coupling effects among a PFC power supply,an EMI filter and input power cord are studied by experiments and theoretical analysis in detail.Near field coupling nature and its influence positions are analyzed firstly.Then a Saber conducted EMI circuit simulation model of this power converter is built up and verified,which includes the electric coupling effect.After ignoring some small parameters in common mode EMI paths of this power supply,a simplified common mode EMI model is obtained and electric coupling influence is analyzed based on the model.Critical sensitivity coupling distance concept is then proposed and applied between this PFC and EMI filter.Its value can be obtained by approximated calculation or measurement and it is helpful for power supply EMC optimizing design in early stage.Finally,some novel coupling EMI control methods,such as relative angle arrangement,are proposed and verified.

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Key concepts: EMI, Electromagnetic interference, Coupling (piping), Power (physics), Common-mode signal, Switched-mode power supply, Filter (signal processing), Engineering