Modeling Strategy for EMI Filters
Ruijie He, Yang Xu, Sameer Walunj, Shaohui Yong, Victor Khilkevich, David Pommerenke, Hermann Aichele, Martin Boettcher, Philipp Hillenbrand, Andreas Klaedtke
Abstract
Performance of electromagnetic interference (EMI) filters in power-electronics applications is limited by the parasitic coupling between the components of the filters and the self-parasitic of each component. While these parasitic effects can be partially taken into account on the circuit level, it is difficult to estimate their values. In this article, a full-wave modeling methodology is proposed to predict the performance of a complete EMI filter up to 1 GHz. Following the proposed methodology, the mutual couplings among the EMI filter components are taken into account as well as the self-parasitics of each individual component. Experiments and simulations are carried out to validate the modeling methodology. A self-parasitic cancellation technique is also applied to demonstrate the benefits of three-dimensional modeling methodology in EMI filter design.