Measurement and Modeling of Bias-Dependent Powder Cores Permeability

This contribution treats the experimental and mathematical characterization of permeability spectra of magnetic powder materials subject to significant DC-current bias levels. The permeability spectra of two different commercial powder cores are experimentally measured and processed through two different modeling approaches, which allow exploiting the gathered data to properly predict the electrical behavior of high-frequency inductors built upon the considered magnetics, for the sake of system level simulation and optimization. The performance of the two approaches are compared and one example of EMI filter inductor design driven by the considered parameterized characterization is presented.