A low switch voltage stress interleaved boost converter for power factor correction

In this paper, a two-phase interleaved boost converter with low switch voltage stress and automatic current-sharing capability is proposed for single-phase power factor correction (PFC). First, a forward-type converter is integrated with the first phase to achieve much higher voltage conversion ratio and avoid operating at extreme duty ratio. Then, two capacitors are added as voltage dividers for the two phases for reducing the voltage stress of active switches and diodes. Therefore, one can adopt lower voltage rating devices to further reduce both switching and conduction losses. Furthermore, the load current can be shared uniformly by each phase without adding any additional current sharing control. The steady state characteristic and performance analysis are made to show the merits of the proposed converter. Finally, the validity of the proposed converter is also verified through comprehensive simulations.