Study and implementation of a two-phase interleaved bridgeless buck power factor corrector

In this paper, a new topology of interleaved bridgeless PFC is proposed. Through removing the input rectified diodes and reducing the current stresses on switch devices, circuit conversion efficiency can be improved. The interleaved control method has some merits such as higher power density, lower input and output current ripples and easier design of EMI filter. And detailed operation analyses will be presented as well. A 700-W prototype with universal input and 160-V output is implemented and verified in this article. The efficiency values are all closed to 96% at the conditions of half-load and 115-V or 230-V line input voltage. The values of PF and THD all are greater and smaller than 95% and 5%, respectively, from half-load to full-load conditions. And the THD value is conformed to the norm of IEC61000-3-2(class D).