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Absnact -To achieve high efficiency PFC front stage in switching mode power supply (SWS), Dual Boost PFC (DBPFC) topology shows superior characteristics compared with traditional Boost PFC, but it by nature brings higher EMI noise, especially common mode (CM) noise. This paper deals with the modeling and analysis of DBPFC CM noise based on and compared with Boost PFC, noise propagation equivalent circuits of both topologies are deduced, and theoretical analysis illustrates the difference. Experiments are performed to validate the E M model and analysis.I. (b) Smcture 575 0-7803-8458-X/04/$20.00 02004 IEEE

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