Differential-Mode EMI Reduction in a Multiphase DCM Flyback Converter

Abstract—Switched converters are a source of electromagnetic interference (EMI) due to the hard switching and abrupt edges in the current and voltage waveforms. Multiphase converters can reduce the EMI at the source, minimizing the conducted EMI gen-eration, without changing dramatically the normal operation of the circuit. Input fllter can be greatly reduced, radiated EMI is lower, and internal EMI problems are minimized. This paper is focused on exploring multiphase converters as a topological technique to reduce conducted differential-mode EMI generation at the source, considering some nonidealities of the multiphase converter. Index Terms—Electromagnetic conductive interference, power conversión, power conversión harmonics. I