This paper analyzes common-mode resonance in high-frequency auxiliary converters and explores a suppression ap-proach by introducing an efficient common-mode equivalent modeling method.Firstly,the converter system with multiple noise sources was equivalently represented using several models with a single noise source.This significantly reduced the system complexity,facilitat-ing the analysis of resonance generated by specific noise sources.Secondly,the generating mechanism of common-mode resonance was uncovered,by investigating the time-frequency characteristics of common-mode current and the transfer admittance characteristics of in-terference coupling paths within the chopper circuit of high-frequency auxiliary converters.Finally,a method for suppressing resonance at the sources was proposed,and its effectiveness was validated through simulations and experiments.
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