EMI Filter design using high frequency models of the passive components

The aim of this paper is to propose a new design method of EMI filters for the power converters using high frequency models of the passive components. It is well known that the static converters are the main source of conducted disturbances of the common mode and differential mode. Often, the solution used to reduce conducted emissions consists to use the EMI filters. The design of these filters is very difficult because it requires complete mastery of the design process. In this paper, a high frequency modeling method of the coupled inductors of filter is proposed. Coupled inductors and capacitor models are used to make a complete EMI filters. The high frequency models of these components are used in the simulations and the obtained results are compared to a prototype measurement data. A new EMI filters design method based on the optimization of the stray elements is detailed. It is based on the analysis of conducted EMI induce by the DC-DC converter.