Multiplexing Wireless Power Transfer System for EV Charging Stations

Abstract

In electric vehicle (EV) charging stations, a common approach to charge multiple EVs is to utilize a shared DC bus for all the converters. However, as the scale of the station grows, this method leads to increased complexity and higher expenses due to the growing number of components. This paper proposes a novel AC multiplexed wireless power transfer (WPT) topology, in which charging modules are connected in parallel on the AC side of a single converter via a highly coupled multi-winding transformer. This topology reduces costs and enables multidirectional power flow for V2X (vehicle-to-vehicle and vehicle-to-grid) applications. In this paper, a comprehensive introduction to the AC multiplexed WPT system is presented, followed by an analysis of its multidirectional power flow characteristics. Finally, a three-port prototype was developed to validate theoretical analysis.