EMI Noise Reduction for PFC Converter with Improved Efficiency and High Frequency Clock

Abstract

This paper proposes a new Power Factor Correction (PFC) converter with Electro-Magnetic Interference (EMI) noise reduction and improved efficiency using 500kHz clock. Using Schottky Barrier Diodes (SBDs) of Silicon Carbide (SiC), the efficiency is improved with suppression of recovery currents of freewheel diodes. Thanks to this suppression, the operating clock frequency can be as high as 500kHz, which enables to use very small inductors and capacitors in the low-pass filter (LPF) located in the front-end. Also by modulating the clock frequency, the EMI noise is reduced by -18.8 dB using the triangular modulation signal with 0.75V amplitude and 500 Hz frequency.