Common-mode EMI reduction for PFC converter

Interleaved multichannel power factor correction (PFC) converter is very popular today because of its ability to reduce input and output current ripples. In this paper, the common-mode (CM) electromagnetic interference noise emission model of the multichannel PFC converter is studied. A balance technique is introduced to reduce CM noise emission. To improve the high-frequency balance, a novel topology with coupled-inductor structure is proposed. Its CM noise model is derived and balance condition for minimizing CM noise is calculated. A two-channel PFC converter is built to verify the proposed balance technique. Simulation results show that CM noise can be reduced up to 20 dB between 150 kHz and 1 MHz.