ANALYSIS OF EDDY-CURRENT LOSS IN MN-ZN FERRITES FOR POWER-SUPPLIES

An attempt was made to divide power loss in Mn-Zn ferrites into hyster esis loss, eddy current loss and residual loss factors experimentally. We noticed the correspondence between the temperature, Tmin at which hysteresis loss exhibits minimum valve, and secondary peak temperature of initial permeability. Analyzing the power loss and electrical resi stivity measured at Tmin, it was found that the power loss can be divi ded into hysteresis loss, resistivity dependent loss component (eddy c urrent loss) and resistivity independent loss component. Consequently, the residual loss was identified to be a loss component independent o f resistivity.