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.
Highlights
Magnetic resonant coupling wireless power transfer (MRC-Wireless power transfer (WPT)) technology has attracted great attention, owing to its efficiency in transferring power over mid-range distances, in which the transfer distance is several times larger than the characteristic sizes of resonators [1]
The computation results for the magnetic-coupled WPT [12] suggested that under approximately 300–400 kHz, the induced electric field was more restrictive than peak spatial-average specific absorption rate (psSAR)
In this study we proposed a modified resonator with a grounded loop for an MRCWPT system to mitigate its interaction with the human body and obtain efficient shortrange power transfers
Summary
Magnetic resonant coupling wireless power transfer (MRC-WPT) technology has attracted great attention, owing to its efficiency in transferring power over mid-range distances, in which the transfer distance is several times larger than the characteristic sizes of resonators [1]. The strength of the induced electric field in a human body is often used to assess the electromagnetic-field safety of WPT systems [21]. The induced electric field in a human body was computed for two WPT systems using the scalar-potential finite difference (SPFD) method. This study compares the SAR and the in situ electric fields in the human-body model when the WPT is used with and without induced electric field in a human body was computed for two WPT systems using the scalar-potential finite difference (SPFD) method. This study compares the SAR and the in situ electric fields in the human-body model when the WPT is used with and withof 14 out the grounded loop.
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