A ZVS/ZCS solution to crossover distortion in boost PFC rectifier

Several ZVS/ZCS (zero voltage switching/zero current switching) snubbers have been proposed in the past to minimize the losses and EMI in boost PFC. In these topologies, the commutation energies are reflected to the load or source to achieve energy conservation. However, this energy can also be utilized in a way to further improve the performance of the PFC and this paper is a first step in this direction. Here, we will propose a new topology to minimize the crossover distortion in boost rectifier. The main characteristic of the proposed topology besides ZCS/ZVS switching is that it also improves the crossover distortion. A prototype system was built and tested to verify the proposed topology.