Harmonic Current Reduction Method of Hand-Held Resonant Magnetic Field Charger (HH-RMFC) for Electric Vehicle


The hand-held resonant magnetic field charger (HH-RMFC) is a convenient equipment of charging the batteries without any electrical contact. Due to high coupling coefficient of HH-RMFC, the single phase power inverter with square wave encounter relatively small reactance at its harmonic frequencies. Thus, the current flowing through the Tx and Rx windings can be distorted. The distorted current with large amount of harmonics may act as magnetic near field noise to the adjacent sensitive electronic devices such as sensors, controller and communication devices in electric vehicles (EVs). Moreover, the current harmonics have the effect of increasing losses and thermal stress in power system. In this paper, a reduction method of the harmonic currents in HH-RMFC is proposed. The circuit simulation results show that the harmonic currents flowing through Tx and Rx windings in HH-RMFC can significantly be reduced by applying the proposed method. The circuit simulation results show that proposed method can reduces THD of Tx current and Rx current by 15.64 % and 14.11 %, respectively.

Meeting Name

2014 International Symposium on Electromagnetic CompatibiIity, EMC 2014 (2014: May 12-16, Tokyo, Japan)


Electrical and Computer Engineering

Keywords and Phrases

Magnetic Field Noise; Resonant Magnetic Field; Total Harmonic Distortion; Wireless Power Transfer

International Standard Book Number (ISBN)


International Standard Serial Number (ISSN)


Document Type

Article - Conference proceedings

Document Version


File Type





© 2014 Institute of Electronics, Information and Communication Engineers (IEICE), All rights reserved.

Publication Date

16 May 2014