A family of back-to-back three-level power factor correction (BT-PFC) converters with less switch devices are constructed by the back-to-back bridgeless power factor correction circuit and different bidirectional-switches. The DC side of the back-to-back bridgeless power correction circuit adopts a cascade or embedded bidirectional switch structure

which can achieve five voltage levels between bridge arms during the power frequency cycle

effectively reducing harmonic content and lowering the equivalent switching frequency. In this paper

the cascaded/embedded structure

working principle

circuit topology characteristics

decoupling closed-loop control and modulation technology of the proposed BT-PFC converter are analyzed in detail. Finally

an experimental prototype with an input of 220 V/50 Hz and a rated output of 1 kW/400 V was designed based on the BT-PFC-VI circuit. The experimental results verified that the theoretical analysis of the proposed PFC topology is correct

and its design method is proven to be feasibility.