The design of common mode (CM) inductors depends upon comprehensive system models, which require the best knowledge of parasitic effects. Typically, a filter design is based on equivalent circuits, and the quality of the component models defines the outcome and applied design safe margins. Thus, high-accuracy models of every filter component are desirable. Past works proposed models for CM inductors. However, recently, the notion of magnetized capacitance has been proposed to model the effect of the energy stored in a magnetic core of power inductors and the consequent generation of electric fields that also store energy. The impact of such an effect on CM inductors has not yet been reported. Thus, this work addresses the question of how important this effect is in modeling CM inductors. The method used here incorporates state-of-the-art models for the well-known electromagnetic effects occurring in CM inductors, including the magnetized capacitance model. Experimental results on inductors built with different Mn-Zn and Ni-Zn ferrite cores are compared with the presented theoretical models. A critical evaluation of the results is presented.
