Abstract：To extend the load variation range of Boost PFC converter operating in DCM and CCM, a novel PFC converter operating in pseudo continuous conduction mode (PCCM) is proposed. The operation of PCCM Boost converter is analyzed and its large signal model is established. Based on which, the digital valley current control strategy of current loop and PI compensation of voltage loop is designed. The PCCM Boost PFC converter can achieve high power factor over a wide load variation range. The performance of PCCM Boost PFC converter and CCM Boost PFC converter is verified and compared by using a 70～400W experimental prototype.
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2011, Vol. 26 
