Performance improvement of resonator-coupled wireless power transfer system using dual-spiral resonator with angular misalignments

Norodin, Nur Syafiera Azreen; Hotta, Masao

doi:10.23919/ursirsb.2020.9240098

Cited by 1 publication

(1 citation statement)

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“…In this system, if a magnetic field is used for field coupling, electric energy can transmit wirelessly through materials such as walls [5], water [6], and so on. Furthermore, the performance of the RC-WPT system is stable against the positioning tolerance between Tx and Rx units [7]. This has resulted in significant developments in power supply for electric appliances, electric vehicles [8], small robots [9], mobile devices [10], and medical devices [11]- [13].…”

Section: Introductionmentioning

confidence: 99%

Effects of Lossy Mediums for Resonator-Coupled Type Wireless Power Transfer System using Conventional Single- and Dual-Spiral Resonators

Norodin

Nakamura

Hotta

2022

IEICE Trans. Electron.

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To realize a stable and efficient wireless power transfer (WPT) system that can be used in any environment, it is necessary to inspect the influence of environmental interference along the power transmission path of the WPT system. In this paper, attempts have been made to reduce the influence of the medium with a dielectric and conductive loss on the WPT system using spiral resonators for resonator-coupled type wireless power transfer (RC-WPT) system. An important element of the RC-WPT system is the resonators because they improve resonant characteristics by changing the shape or combination of spiral resonators to confine the electric field that mainly causes electrical loss in the system as much as possible inside the resonator. We proposed a novel dual-spiral resonator as a candidate and compared the basic characteristics of the RC-WPT system with conventional single-spiral and dual-spiral resonators. The parametric values of the spiral resonators, such as the quality factors and the coupling coefficients between resonators with and without a lossy medium in the power transmission path, were examined. For the lossy mediums, pure water or tap water filled with acryl bases was used. The maximum transmission efficiency of the RC-WPT system was then observed by tuning the matching condition of the system. Following that, the transmission efficiency of the system with and without lossy medium was investigated. These inspections revealed that the performance of the RC-WPT system with the lossy medium using the modified shape spiral resonator, which is the dual-spiral resonator proposed in our laboratory, outperformed the system using the conventional single-spiral resonator.

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