2005•Hebei ke-ji daxue xuebaoOpen access

EMC design of switching power supply

Yunfeng Xu

Abstract

This paper analyses the EMC wave of the switching power supply and establishes the circuit model that results in common mode interference and series mode interference. Then provides the concrete solution:making use of single or double level EMI filters can filter common mode interference and series mode interference effectively. Finally, it introduces the method to choose the device parameter in the EMI filters. The experiment indicates that it can reduce EMI by 40 dBμV by the simple EMI wave filter. However,using the improved EMI wave filter can reduce EMI by 50~70 dBμV.

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Available abstract

Key concepts: EMI, Electromagnetic interference, Interference (communication), Electronic engineering, Common-mode signal, Filter (signal processing), Electrical engineering, Power (physics)