Study of Power Factor Corrector Operating at Multiple Switching Frequencies

This paper deals with the use of multi-switching-frequency approach for reduction of conducted electromagnetic emissions (EME) from power factor correctors (PFC) operating in discontinuous conduction mode (DCM). The effect of multi-switching-frequency operation on the total harmonic distortion (THD) of PFC input current., power factor., conducted EME levels and efficiency is studied in details in the paper. The PFC in DCM is studied by using simulation in PSIM software and analytically. Performance of the DCM PFC with the multi-switching-frequency approach is compared to that of classical switching-frequency modulation. Some advices for more effective use of the multi-switching-frequency approach in DCM PFC are proposed.