Reduction Method of Electromagnetic Interference in Tightly-Coupled Resonant Magnetic Field Automotive Charger with Input Impedance Design


In this paper, we propose electromagnetic interference (EMI) reduction method in tightly-coupled resonant magnetic field automotive charger. The main technique for reducing EMI is input impedance design based on theoretical analysis of tightly coupled wireless power transfer (WPT) circuit. In order to design input impedance of the tightly coupled WPT circuit, the characteristics of the magnitude of the input impedance curve with the frequency splitting phenomena should be analyzed. From these theoretical analyses, the circuit parameters for increasing the magnitude of the input impedance at harmonic frequencies are designed. To verify the method, we compare total harmonic distortion (THD) between the proposed WPT system and the typical tightly coupled WPT system with series-series resonant topology using the ANSYS Simplorer. The simulation results of the proposed WPT system show that THD of Transmitter(Tx) and Rx currents flowing through Transmitter and receiver coil are reduced by 53.85% and 39.52% respectively.

Meeting Name

2016 IEEE Wireless Power Transfer Conference, WPTC 2016 (2016: May 5-6, Aveiro, Portugal)


Electrical and Computer Engineering


This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MEST) (No. 2012-0000990 and No. 2010-0029179).

Keywords and Phrases

Electromagnetic Interference; Magnetic Coupling; Magnetic Field Battery Charger; Total Harmonic Distortion

International Standard Book Number (ISBN)


Document Type

Article - Conference proceedings

Document Version


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© 2016 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

06 May 2016