A New Zero-Current-Switching Bridgeless PFC

This paper presents a new ZCS single phase bridgeless PFC which uses an auxiliary circuit for achieving zero current switching conditions for all switches of conventional bridgeless PFC. The input current is controlled by a peak current controller and output voltage is controlled with a limited band pi controller. The proposed PFC uses a bridgeless rectifier therefore the conduction loss will decrease significantly. And with using zero Current switching the switching loss of all switches will be removed. The auxiliary switch turns on and off in zero current conditions so there is no switching loss on the auxiliary switches. Nine stages are described for each ZCS switching period. The results have been verified with PSIM simulation.

Keywords:

bridgeless PFC , PWM rectifier , zero-Currentswitching (ZCS)