Selection of Optimum Frequency and Optimization

Abstract

The issues related to the selection of the optimum frequency are presented, including the optimization of power transfer and transfer capacity in a wireless power transfer system. Power loss due to Joule heating and material loss is an important factor to consider, including skin effects. At high frequencies, electric current in conductor is confined to the skin of the conductor, which limits the conduction of electric current and leads to current loss. Low magnetic reluctance of the core induces high magnetic flux density, which increases the performance of the wireless power transfer system. Low core loss and resistance are required in a typical system that uses a ferrite core. Switching devices and components for power electronics as well as the international standard and recent trend in industry for wireless power transfer technology are also discussed.