SnO₂-Substituted MnZn Ferrite with Low Power Loss

Abstract

The effect of chemical composition and firing conditions on the core loss characteristics of MnZn ferrite has been studied with special reference to the factors of core loss. It was found that hysteresis and eddy current losses comprise most of the core loss for MnZn ferrite used at 100kHz. Especially, the eddy current loss remarkably increased with increasing the frequency in comparison with hysteresis loss. On the basis of the fact that the eddy current loss bears a linear relationship to the electrical resistivity, an experimented addition of SnO2 to MnZn ferrite has been tried to improve the electrical resistivity. As a result, MnZn ferrite with low power loss has been successfully developed.