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PEEC-Based Modeling of EMI Filters Including Parasitics and Geometrical Arrangement of Filter-Elements

With increasing switching frequency and higher power density of converter systems, electromagnetic interference (EMI) problems introduce additional design constraints that should be considered in the earliest system design stages. To comply with EMC standards, the conducted and radiated emission levels generated by power electronic systems have to be controlled, necessitating the use of EMI filter circuits. Thus, EMI filter components have to be examined in detail, including their high-frequency behaviour in combination with PCB placement and parasitic couplings. An optimised arrangement of filter components is required to fulfil EMI specifications with minimum constructional effort. In order to speed up EMI filter design, nowadays mostly based on a trial-and-error process, virtual prototyping and accurate electromagnetic simulators are required.