Reduction in Human Interaction with Magnetic Resonant Coupling WPT Systems with Grounded Loop

Xianyi Duan, Junqing Lan, Yinliang Diao, Jose Gomez-Tames, Hiroshi Hirayama, Masashi Hotta, George Fischer and Akimasa Hirata
Additional contact information
Xianyi Duan: Department of Electrical and Mechanical Engineering, Nagoya Institute of Technology University, Nagoya 4668555, Japan
Junqing Lan: College of Electronic Engineering, Chengdu University of Information Technology, Chengdu 610103, China
Yinliang Diao: Department of Electrical and Mechanical Engineering, Nagoya Institute of Technology University, Nagoya 4668555, Japan
Jose Gomez-Tames: Department of Electrical and Mechanical Engineering, Nagoya Institute of Technology University, Nagoya 4668555, Japan
Hiroshi Hirayama: Department of Electrical and Mechanical Engineering, Nagoya Institute of Technology University, Nagoya 4668555, Japan
Masashi Hotta: Graduate School of Sciences and Technology for Innovation, Yamaguchi University, Yamaguchi 7558611, Japan
George Fischer: Institute for Electronics Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91058 Erlangen, Germany
Akimasa Hirata: Department of Electrical and Mechanical Engineering, Nagoya Institute of Technology University, Nagoya 4668555, Japan

Energies, 2021, vol. 14, issue 21, 1-14

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 ( ps SAR), 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.

Keywords: spiral coil; wireless power transfer; grounded loop; human safety; specific absorption rate (SAR); computational dosimetry (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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