Frequency Independent Lumped Parameter Model of Ferrite Core

Abstract

This paper propose a model of complex magnetic permeability of ferrite core inductor with frequency independent lumped parameters. The electrical model, suitable for circuit design process, is consist of two resistance, one inductance, and one capacitance. The model with four unknown parameters is tested on ferrite ring core 3F3 10/6/4 by Ferroxcube. Impedance and core loss of the core are measured at low excitation up to 1 mT and in operating frequency range from 0.1 to 10 MHz. Two of these four parameters are obtained by measurement or taken from the data sheet. Remain two parameters are estimated by fitting procedure comparing equivalent serial representation with measured data. The measuring procedure is performed using an Impedance Analyzer HP 4194A.