A novel wireless converter topology for dynamic EV charging

Abstract

This paper presents a novel topology, based on inductive power transfer (IPT) that is suitable for dynamic charging of electric vehicles (EVs). The proposed topology is novel in that a super capacitor (SC) is used in conjunction with the EV IPT secondary converter to combine power transfer and energy storage in a single converter. In comparison to existing dynamic EV IPT systems, this topology requires no additional switching components, while offering the benefit of a SC energy buffer. Operational modes of the system are described in terms of the switching waveforms required to transfer energy between the grid powered primary IPT pad and the EV. A mathematical model that describes the power transfer within the system is presented along with a simple control strategy to regulate power flow. Simulated and experimental performance of a small scale prototype system in a typical dynamic charging scenario is presented to confirm the validity of the mathematical model and the control strategy.