PEEC-based virtual design of EMI input filters

The paper summarizes a step by step Partial Element Equivalent Circuit (PEEC) modeling approach for Electromagnetic Interference (EMI) filter components (e.g. foil capacitors, common mode and differential mode inductors) and PCB tracks, to design complete EMI input filters with an optimal selection and placement of the individual components. The presence of magnetic cores is modeled with the proposed PEEC-Boundary Integral Coupled Method (PEEC-BIM) by means of fictitious magnetic surface currents, using the core geometry and permeability as inputs. The developed PEEC based models are verified by transfer function measurements of several single-phase single/two-stage filter circuits. The resulting PEEC simulation time is determined by the time required to perform the surface mesh of the magnetic volume and is in the order of several minutes. The good results of the presented PEEC modeling approach enable a fast virtual design of EMI filters and help to accelerate the design process of power converter systems.