This paper describes the development of a thermal modeling method for high-frequency inductors used in switch mode power supply (SMPS). In the proposed modeling method, the effect of proximity-effect loss occurring near the air gap on winding surface temperature was considered. In addition, the effect of anisotropic thermal conductivity in a winding block on the winding surface temperature was considered. As the key point in the numerical modeling, the significance of considering the influence of the proximity-effect loss and the anisotropic thermal conductivity on the winding surface temperature was demonstrated experimentally and numerically.

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