A novel critical-conduction-mode bridgeless interleaved boost PFC rectifier

A novel bridgeless interleaved boost PFC rectifier is proposed for improving power efficiency and system performance in this paper. By combining the conventional bridgeless topology and the interleaved technology, this rectifier is comprised of two interleaved boost branches without the front-end diode bridge. Each branch operates in every half-line cycle, together with the current following through a minimum number of switching devices. By using the interleaved approach, this topology not only decreases the current stress of the switching devices but also reduces the current and voltage ripple. Moreover, as operating in critical-conduction-mode (CrM), all the switches can achieve soft-switching characteristics to reduce the switching loss and evidently raise the conversion efficiency. Using a conventional interleaved controller, simple control scheme can be employed to the proposed converter. The operational principle and theoretical analysis of the proposed converter are presented. Finally, simulations based on actual semi-conductor models were carried out to verify the feasibility and exactness of the proposed rectifier.