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Reduction in human interaction with magnetic resonant coupling WPT systems with grounded loop

Energies Volume 14 Issue 7253
published_at 2021-11-03
2022-5-27-11-55energies-14-07253.pdf
[fulltext] 4.17 MB
Title
Reduction in human interaction with magnetic resonant coupling WPT systems with grounded loop
Abstract
Wireless power transfer (WPT) systems have attracted considerable attention in relation to providing a reliable and convenient power supply. Among the challenges in this area are maintaining the performance of the WPT system with the presence of a human body and minimizing the induced physical quantities in the human body. This study proposes a magnetic resonant coupling WPT (MRC-WPT) system that utilizes a resonator with a grounded loop to mitigate its interaction with a human body and achieve a high-efficiency power transfer at a short range. Our proposed system is based on a grounded loop to reduce the leakage of the electric field, resulting in less interaction with the human body. As a result, a transmission efficiency higher than 70% is achieved at a transmission distance of approximately 25 cm. Under the maximum-efficiency conditions of the WPT system, the use of a resonator with a grounded loop reduces the induced electric field, the peak spatial-average specific absorption rate (psSAR), and the whole-body averaged SAR by 43.6%, 69.7%, and 65.6%, respectively. The maximum permissible input power values for the proposed WPT systems are 40 and 33.5 kW, as prescribed in the International Commission of Non-Ionizing Radiation Protection (ICNIRP) guidelines to comply with the limits for local and whole-body average SAR.
Creators Duan Xianyi
Creators Lan Junqing
Creators Diao Yinliang
Creators Gomez-Tames Jose
Creators Hirayama Hiroshi
Creators Hotta Masashi
Affiliate Master Yamaguchi University
[kakenhi]15501 grid.268397.1
Creators Fischer George
Creators Hirata Akimasa
Source Identifiers [PISSN] 1996-1073
Creator Keywords
spiral coil wireless power transfer grounded loop human safety specific absorption rate (SAR) computational dosimetry
Languages eng
Resource Type journal article
Publishers MDPI AG
Date Issued 2021-11-03
Rights
Creative Commons Attribution 4.0 International(https://creativecommons.org/licenses/by/4.0/deed.en)
File Version Version of Record
Access Rights open access
Relations
[isIdenticalTo] https://doi.org/10.3390/en14217253
Funding Refs
Japan Society for the Promotion of Science [crossref_funder]https://doi.org/10.13039/501100001691
Award Energy Conversion Systems: From Materials to Devices 2019/R1