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Temperature dependence of power loss of Mn-Zn ferrites at high frequency

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3 Author(s)
J. J. Suh ; ISU Ceramic, Wonju, South Korea ; B. M. Song ; Y. H. Han

The power loss characteristics of Mn-Zn ferrites were observed up to 1 MHz at 25 mT as a function of temperature. At 100 kHz the temperature at which the power loss minimum occurred was near 70°C, at 500 kHz 50°C and at 1 MHz even lower. The contribution of eddy current loss to the temperature dependence of the total power loss was negligibly small at 1 MHz because the resistivity is independent of temperature. The contribution of the residual loss due to magnetic rotation was significant and strongly temperature dependent at 1 MHz. The frequency where the residual loss starts to increase was in good agreement with the onset frequency of dissipation of the complex permeability

Published in:

IEEE Transactions on Magnetics  (Volume:36 ,  Issue: 5 )