Terminal characterization of conducted EMI in three-phase power converters

Terminal characterization of conducted EMI in power converters helps to estimate the effect of inserting EMI filter or changing connection conditions and thus alleviates the effort of designing suitable EMI attenuation measures. In this paper, a procedure to characterize the conducted EMI in three-phase power converters with terminal model is proposed. The model consists of active sources and passive admittance matrix. Parameters inside model are calculated with terminal currents and voltages at LISN, by considering overall setup as series cascaded transfer matrix. The modeling is based on either time-domain simulations or experimental data acquisition. The effectiveness of model is verified by comparing predicted and simulated as well as measured results at changing connection conditions.