Transcription of Electromagnetic Interference (EMI) in Power Supplies
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Electromagnetic Interference (EMI) in Power Supplies
Fairchild Semiconductor Power Seminar 2010-2011 1 Electromagnetic Interference (EMI) in Power Supplies Alfred Hesener Abstract -- 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. I. INTRODUCTION In Power Supplies , the two prominent types of EMI are conducted EMI and radiated EMI. Comprehensive regulations provide limitations to radiated and conducted EMI generated when the Power supply is connected to the mains.
Fairchild Semiconductor Power Seminar 2010-2011 2 Fig. 1. EMI sources. The noise source can be inside or outside the power supply. Tackling the noise problem at the source means reducing the emission levels — for example, by lowering noise amplitudes. Different coupling mechanisms exist for noise, and many EMI
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