Real-time Maximum Efficiency Control in Dynamic Wireless Power Transfer System

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  • Kobayashi Daita
    Graduate School of Frontier Sciences, The University of Tokyo
  • Imura Takehiro
    Graduate School of Frontier Sciences, The University of Tokyo
  • Hori Yoichi
    Graduate School of Frontier Sciences, The University of Tokyo

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  • 走行中ワイヤレス給電システムにおけるリアルタイム最大効率制御
  • ソウコウ チュウ ワイヤレス キュウデン システム ニ オケル リアルタイム サイダイ コウリツ セイギョ

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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.

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