MCR-WPT Efficiency Improvement Based on Metamaterial Interactive Modeling and Analysis

Abstract

Metamaterials have special magnetic field control capabilities as a matter of concern and have been applied in the field of magnetically-coupled resonant wireless power transfer (MCR-WPT). It is a challenging study topic to seek a metamaterial designed for the target needs of a specific field. The S-parameter retrieval method and equivalent circuit method have received wide attention as the commonly used design methods for metamaterials. The parameters of metamaterials are obtained by repeated simulations, this design process is time-consuming. In this paper, the characteristics of the above two design methods are analyzed and combined. The HFSS and MATLAB software are used to interactively design and optimize the metamaterials used for MCR-WPT characteristic improvement, which effectively simplifies the design process. Furthermore, the square and Koch metamaterial units are designed to optimize the efficiency, and the characteristics of the units are analyzed and compared. Finally, an experimental platform of 6.78 MHz MCR-WPT system is built to analyze the influences of metamaterials on efficiency. The experimental results show that the square metamaterial and Koch metamaterial achieve 28.4% and 24.6% of the maximum power transmission efficiency, respectively, which proves that interactive design can more conveniently design metamaterials and improve the transmission efficiency of the MCR-WPT system.

Keywords

• wireless power transfer (wpt)
• metamaterial
• analysis and design
• interactive simulation
• power transmission efficiency