Resonant Inductive Wireless Power Transfer of Two-Coil System with Class-E Resonant High Frequency Inverter

Abstract

Wireless power transfer is the method of transferring electrical energy from source to electrical load without using any physical contact. One of the most common magnetic couplings is the resonant inductive power transfer (RIPT). It is a system which is composed of at least two magnetically coupled coils called sending end coil and receiving end coil which is forced to operate at resonance to make the circuit appear pure resistive. In this paper simulation of two coil inductive wireless power transfer is described with the help of class-E resonant high frequency inverter. The high frequency inverter used in this system is resonant class-E converter which is operated at 1 MHz switching frequency. To minimize the switching loss, soft switching technique has been implemented i.e. switching of semiconductor device is done at instant where the voltage is zero which is called as zero voltage switching (ZVS). At the end, calculated values of efficiency, sending coil quality factor, receiving coil quality factor, resonant frequency and bandwidth is summarized.