Abstract
Conducted electromagnetic interference (EMI) in power electronic equipment is an important factor restricting the development of power electronics technology, and the research is of great hot and difficulty. The prediction of conducted EMI is to effectively guide the design of EMI filters. On the one hand, the selection of commonmode capacitance and inductance values can be guided by the analysis of propagation path impedance; on the other hand, various passive devices are analyzed by simulation the influence of parasitic parameters on conducted EMI can guide the selection of filter capacitors and inductors. In this paper, we take the widely used switching power supply as an example, a novel EMI conduction modelling is proposed, the impedance analysis method is used to model the high-frequency parasitic parameters, the model was built for predicting the conducted EMI accurately of switching power supply.
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