Increasing power density, faster switching and higher currents forces designers to spend more time both considering the effects of electromagnetic interference (EMI) and debugging a design that has EMI problems but is otherwise complete.This paper explains the different types of EMI and their coupling mechanisms and the existing EMI regulations. The most frequent noise sources, transmission paths and receiver sensitivity are examined. Based on real designs and measurements, specific procedures are recommended for use throughout the design cycle, to make the power supply work reliably and pass EMI testing。
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