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 nth 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 nth 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 nth harmonic frequency and higher value of the power transfer efficiency in the loosely coupled automotive wireless power transfer system.
B. Sim and S. Jeong and Y. Kim and S. Park and S. Lee and S. Hong and J. Song and H. Kim and H. Kang and H. Park and D. Lho and J. Kim, "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," IEEE Transactions on Electromagnetic Compatibility, vol. 63, no. 3, pp. 935 - 946, article no. 9288921, Institute of Electrical and Electronics Engineers (IEEE), Jun 2021.
The definitive version is available at https://doi.org/10.1109/TEMC.2020.3039412
Electrical and Computer Engineering
Electromagnetic Compatibility (EMC) Laboratory
Keywords and Phrases
Automotive Electromagnetic Compatibility (EMC); Electromagnetic Interference (EMI); EMC; Harmonic Frequency (HF); Resonant Frequency; Shielding; Wireless Power Transfer (WPT)
International Standard Serial Number (ISSN)
Article - Journal
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01 Jun 2021