A Review on the Recent Development of Capacitive Wireless Power Transfer Technology

Fei Lu,Chris Mi,Hua Zhang

doi:10.3390/en10111752

Abstract

Capacitive power transfer (CPT) technology is an effective and important alternative to the conventional inductive power transfer (IPT). It utilizes high-frequency electric fields to transfer electric power, which has three distinguishing advantages: negligible eddy-current loss, relatively low cost and weight, and excellent misalignment performance. In recent years, the power level and efficiency of CPT systems has been significantly improved and has reached the power level suitable for electric vehicle charging applications. This paper reviews the latest developments in CPT technology, focusing on two key technologies: the compensation circuit topology and the capacitive coupler structure. The comparison with the IPT system and some critical issues in practical applications are also discussed. Based on these analyses, the future research direction can be developed and the applications of the CPT technology can be promoted.

Highlights

IntroductionWireless power power transfer transfer (WPT)(WPT) technology technology utilizes utilizes energy-contained energy-contained fields fields to to deliver deliver electric electricWireless power from the transmitter to the receiver side, removing the direct metal-to-metal contact power from the transmitter to the receiver side, removing the direct metal-to-metal contact [1,2,3,4]. [1,2,3,4].The typical typical structure structure of of aa WPTWPT system system isis shown shownin inFigure Figure1.1
The capacitive power transfer (CPT) technology has has been developed in in recent recent years, years, there there are important issues be further further studied studied before can be be widely widely applied applied in real life, life, such such as as the the important issues need need to to be before it it can in real safety concerns and dynamic charging applications
Research on CPT technology is becoming popular in recent years

Summary

Introduction

(WPT) technology technology utilizes utilizes energy-contained energy-contained fields fields to to deliver deliver electric electric. In the power transmission process, a medium is not always required, to the secondary side. In the power transmission process, a medium is not always required, but its but its appearance usually contributes to the improve system performance. At the secondary the receiver the receiver device can convert the fields back into electric power and provide it to the load through device can convert the fields back into electric power and provide it to the load through another another auxiliary auxiliary circuit. According to the category fields, WPT systems can be classified classified intoacoustic acoustic. Thethe current systems can be classified into acoustic power. Accordingto tothe thecategory category of current systems can be into power (APT).