Abstract
High-frequency inductors are one of the most significant loss contributors in switch mode power supply. However, in making the thermal flow simulation model, it is difficult to model a detailed structure of the high-frequency inductor part such as a choke coil and a transformer due to the calculation cost. Therefore, to find the compact modeling method of an inductor part for switch mode power supply, we investigated the effect of proximity losses which occurs close to the air gap, and the effect of anisotropic effective thermal conductivity in inductor windings on the inductor surface temperature. It has been demonstrated in various researches that the proximity-effect losses occurs close to the air gap, and the temperature distribution in an inductor was analyzed in detailed inductor unit. However, in case of system-level thermal analysis, it is not clear how to model the compact thermal model of the inductors which considered the influence of proximity-effect losses on surface temperature.
