電磁界共振結合式ワイヤレス給電のデバイスの最適配置同定法の提案

Abstract

Recently, a system of wireless power transfer (WPT) using the electromagnetic resonant coupling has been studying and developing for practical applications, such as wireless charge systems of automobiles and electronic devices. But, efficiency of an electromagnetic resonant coupling type WPT system with LC resonators is greatly affected by a layout of LC resonators allocated in the system. This means that there is an optimum layout of LC resonators to transferring wireless power at higher efficiency. This paper presents a new method for identifying an optimum layout of LC resonators in a WPT system. One of key ideas is that a problem of searching optimum layout is replaced to a problem of calculating equivalent current sources given into LC resonators. Amplitudes of equivalent current sources can be calculated to solve ill-posed system equations by using inverse analysis. First, the proposal method is described. And system equations to be solved are formulated by means of equivalent circuit techniques. Second, the proposal method is applied to a simplified model to identifying an optimum layout of LC resonators in a WPT system. Then, an identified result by means of the proposal method is verified by comparing a ratio of receiving powers with the identified layout and without LC resonator. Finally, in order to verify the validity of the proposal method, calculated results are compared with experiment results using same model.