Using artificial magnetic conductors to improve the efficiency of wireless power transfer

Yanhong Liu,Lijuan Dong,Yunlong Shi,Yongqiang Chen,Yanyan Shen,Lixiang Liu,Yong Sun,Fusheng Deng,Taixia Shi

doi:10.1063/1.5092143

Abstract

In this study, an advanced wireless power transfer (WPT) system of two coils with the artificial magnetic conductors (AMC) is explored through simulations and experiments. The AMC structure is added on the transmitter coil, and the multiple resonant modes on the surface of the AMC can be energized. On the other hand, the AMC structure act as a magnetic field shield, which leads to the magnetic field above AMC structure is localized. Therefore, the localized resonant magnetic field enhance the transmission coefficient of the WPT system. The results show that the WPT transmission coefficient is increased from 16% to 35% in the experiment at 26.2 MHz resonant frequency when transmission distance is 3 cm. The experimental results agree with the simulation results. Additionally, AMC has the advantages of low-cost and can easily be installed on the WPT system.

Highlights

With continuous development of the Internet of Things (IoT)1 and artificial intelligence, an increasing number of intelligent IoT devices are being used in homes, cities, transportation, and space, which connect to the internet with a flexible and real-time power supply
The results show that the wireless power transfer (WPT) transmission coefficient is increased from 16% to 35% in the experiment at 26.2 MHz resonant frequency when transmission distance is 3 cm
This study analysed the effect of an artificial magnetic conductor (AMC) structure for improving the efficiency of the wireless power transfer system using both simulation and experimental methods

Summary

INTRODUCTION

With continuous development of the Internet of Things (IoT) and artificial intelligence, an increasing number of intelligent IoT devices are being used in homes, cities, transportation, and space, which connect to the internet with a flexible and real-time power supply Such energy demands have rapidly expanded the application requirements and scope of wireless power transfer (WPT) technology, which is becoming indispensable for providing convenient, safe, and highly efficient daily transfer of electric energy. Artificial magnetic conductors (AMC) are an artificial microstructure material with a special surface structure, which was first proposed by Sievenpiper in 1999.21 It is made by etching a copper clad plate and exhibits a high-impedance surface structure and very small tangential magnetic fields When applying this material to antenna, the high impedance at the surface of the AMC can achieve simultaneous regulation of surface wave suppression and zero phase reflection. Our design only requires AMC structure packing in the transmitter end and can achieve a switchable working mode between two different frequencies

STRUCTURAL DESIGN

SIMULATION AND EXPERIMENTAL RESULTS

Findings

CONCLUSION