Accurate simulation of conducted interferences in isolated DC to DC converters regarding to EMI standards

The study presented in this paper concerns an accurate method of simulation of conducted EMI generated by DC-DC power converters (SMPS), in the frequency range and supplying conditions of European standards (10 kHz to 30 MHz). The aim is to develop a "circuit oriented" CAD tool for EMI problems study. Original models of semiconductors and magnetic components are proposed. Experimental results confirm, with a good accuracy, all simulations on a large frequency range. This method allows to optimise the design and cost of power converters and filters.