Prediction of Power Transfer Efficiency in Tens of Kilohertz Band of Contactless Power Transfer Devices That Use Vinyl-Insulated Wire Coils

抄録

The power transfer efficiency of contactless power transfer devices that use vinyl-insulated wires was predicted by combining electromagnetic field analysis using the finite element method and equivalent circuit analysis using the Runge-Kutta method. We examined whether the measured power transfer efficiency is the median of the values obtained from calculations that considered vinyl-insulated wire to be a single solid wire and litz wire (vinyl-insulated wire is considered to be in an intermediate state between these two types of wire). It was found that the measured power transfer efficiency was not the median of the two calculated values in some cases. One of the calculated values was always slightly smaller than the measured value. The proposed method can thus be used to predict the lower limit of power transfer efficiency.