Voltage Control and Current Distribution for Multiple-Coil Wireless Power Transfer System

Abstract

For single transmitter single receiver high-power wireless power transfer system, the coils suffer from high voltage stress and current stress. As the power requirement improves for application, the coil becomes the bottlenecks of the power improving. To solve the problem of improving the system power level, this research adopts the parallel circuits to reduce the voltage and current stress of coils as well as to improve the power level. And for multiple-transmitter multiple-receiver wireless power transfer (MTMRWPT) system, the current distribution is a problem need to be solved. In this study, a control strategy is developed to provides high system efficiency and constant output voltage, and balances the currents distribution in MTMRWPT system.