In this paper we proposes a synthesis of different mathematical models of power electronic converters based on Thevenin/Norton equivalent circuits. Those models, composed by impedances and harmonic noise sources, are helpful to predict the conducted ElectroMagnetic Interferences (EMI) generated by converters connected to the electrical network. Moreover, the extracted impedances contribute to improve EMI filters, since they are considered as the filter's load (upstream and downstream filter's sides). The analytical model is tested with PSpice simulations and validated by experimental measurements, from DC frequency until 30MHz.