Design And Behavioral Study Of EMI Filter Intended For Aeronautical Application

This paper aims to depict approach of a Practical design procedure of an (EMI) filter to decrease the electromagnetic interferences induced by a DC-DC converter intended to use in avionic environment and qualifying to the DO-160E class LMH standard (network side), in the frequency band of 150 kHz - 30 MHz. this paper also highlights the impact of intrinsic parasitic elements of the passive components used in the designed filter on its high-frequency behavior. The designed EMI filter is been dedicated for a high-power buck converter operating at a switching frequency of 20 kHz with an output power of 740W. The study of the system composed of The dc-dc converter, the EMI filter, and a line-impedance stabilization network (LISN) is carried out via simulation using high-frequency equivalent model to obtain the conducted emissions (CE) levels of common mode (CM) and Differential mode (DM). Simulations results are provided afterward to evaluate the mitigation performances of the designed EMI filter. then a demonstration of the influence of inherent stray elements of components on the filter performances is presented in the last section of the paper.