Analysis of the Iron Loss of MnZn Ferrite Using the Spatial Network Method

Abstract

To investigate the iron loss of MnZn ferrites, we simulated the frequency characteristics of the hysteresis loss P_h and eddy current loss P_e in a toroidal core by using the spatial network method. Hysteresis and conductivity were considered in the model of an MnZn ferrite, to compute their mutual influence. The results show that both losses are considerably influenced by the skin effect at high frequencies (over about 200 kHz), and that the ratio of hysteresis loss P_h to iron loss increases with an increase in the magnetic field intensity, because of nonlinear phenomena caused by hysteresis of the core.