A new switching signal optimizing control for buck PFC converter with LC filter

Buck converter with LC input filter has the inherent PFC properties when operating in discontinuous capacitor voltage mode (DCVM). Due to the continuous capacitor voltage mode (CCVM) cannot be fully eliminated in power cycle, a good PFC effect also cannot be guaranteed which is the key for the application of Buck PFC. In this paper, the DCVM model for Buck PFC converter with LC filter has been constructed. Then, a dual-model switch passivity-based control is proposed to optimize the PFC based on the DCVM model and the CCVM model. Simulation results show the validity of DCVM model and a better PFC performance that has been achieved by proposed control method.