A REVIEW OF WIRELESS POWER TRANSFER SYSTEM USING INDUCTIVE AND RESONANT COUPLING

Abstract

Wireless Power Transfer (WPT) using Magnetic Resonance Coupling (MRC) caught the significant attention from the researchers in academia and industries worldwide due to its higher power transfer efficiency especially at medium distances. In this regard, various circuit topologies have been proposed for further improving the efficiency. This review emphasizes the efficiency analysis of WPT system using circuit equations. This literature survey covers the two, three and four coils WPT system. In addition, review of multiple coils WPT structure is also presented. Frequency decrease analysis, impedance matching and frequency splitting phenomenon are also discussed. The two operating principles, maximum power transfer and maximum energy efficiency are described. This is followed by safety standard for WPT technology. Finally, a comparison of Inductive Wireless Power Transfer (IWPT) and Resonant Wireless Power Transfer (RWPT) is provided. This review will be helpful for the readers to understand the circuit structures and operating principles of the WPT technology.