Abstract
The EMI noise source impedance of an SMPS is essential in EMC design, and because DM noise is easy to identify and control but CM noise is still hard to characterize, more concerns are with CM noise. This paper deals with the modeling of CM noise source and introduces a simple way to suppress high frequency common mode EMI noise for switching mode power converters by means of common mode noise source impedance control. Experiments and EMI test results are presented to validate the CM noise suppression method.
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