Real-time maximum efficiency control in dynamic wireless power transfer system

Abstract

Transmitting efficiency is one of the most important characteristics in dynamic wireless power transfer for electric vehicles. In this paper, a simple and efficient topology for a transmitting system called the DC bus system is introduced.Its simplicity maximizes the potential transmitting efficiency. Moreover, a receiving circuit topology and a maximum efficiency control, which is a method to maximize the transmitting efficiency by controlling the secondary voltage, are proposed. A real-time coupling coefficient estimation method is necessary to calculate the secondary voltage command for the control. A simulation and experimental evaluation of the maximum efficiency control was performed using an experimental setup. The results indicate that it provides a large improvement in efficiency and its implementation in a real dynamic power transfer system for electric vehicles is feasible.