A Near Field Analytical Model for EMI Reduction and Efficiency Enhancement Using an nth Harmonic Frequency Shielding Coil in a Loosely Coupled Automotive WPT System

In this article, we propose a near field analytical model of an electromagnetic interference reduction method using an n th harmonic frequency shielding coil with efficiency enhancement in a loosely coupled automotive wireless power transfer system. In general, in the loosely coupled automotive wire...

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Bibliographic Details
Published in:IEEE transactions on electromagnetic compatibility 2021-06, Vol.63 (3), p.935-946
Main Authors: Sim, Boogyo, Jeong, Seungtaek, Kim, Youngwoo, Park, Shinyoung, Lee, Seongsoo, Hong, Seokwoo, Song, Jinwook, Kim, Hongseok, Kang, Hyungmin, Park, Hyunwook, Lho, Daehwan, Kim, Joungho
Format: Article
Language:English
Subjects:
Automotive electromagnetic compatibility (EMC)
Automotive engineering
Electromagnetic interference
electromagnetic interference (EMI)
EMC
Harmonic analysis
harmonic frequency (HF)
Magnetic noise
Magnetic resonance
Magnetic shielding
Mathematical model
resonant frequency
shielding
wireless power transfer (WPT)
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Summary:In this article, we propose a near field analytical model of an electromagnetic interference reduction method using an n th harmonic frequency shielding coil with efficiency enhancement in a loosely coupled automotive wireless power transfer system. In general, in the loosely coupled automotive wireless power transfer system, the power transfer efficiency is relatively lower than a tightly coupled wireless power transfer system due to the low coupling. In addition, the electromagnetic interference at the n th harmonic frequency from the power source can interfere with nearby electronic devices. To reduce electromagnetic interference level and enhance efficiency, we proposed a shielding coil between a transmitter and a receiver coil. By using a near field analytical model of the magnetic field intensity and efficiency equations, we analyze based on the equations and obtain a proper value of the resonant frequency of the shielding coil. Therefore, we can achieve low levels of electromagnetic interference at the specific n th harmonic frequency and higher value of the power transfer efficiency in the loosely coupled automotive wireless power transfer system.
ISSN:0018-9375
1558-187X
DOI:10.1109/TEMC.2020.3039412