Analysis of Wireless Power Transfer Using Metamaterial Slabs Made of Ring Resonators at 13.56MHz

Oh, TaekKyu; Lee, Bomson

doi:10.5515/jkiees.2013.13.4.259

Cited by 19 publications

(12 citation statements)

References 4 publications

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“…The large Rx spiral adds bulk to the receiver of the WPT system, making it difficult to apply to commercial products. In addition, in order to enhance the transfer efficiency of a WPT system, previous researchers employed metamaterial (MTM) structures [8]- [12]. The metamaterial, an artificial material, was able to focus the magnetic field, thereby enhancing the transfer efficiency.…”

Section: Introductionmentioning

confidence: 99%

Magnetic resonance wireless power transfer using three-coil system with single planar receiver for laptop applications

Nguyen

Kang

Choi

et al. 2015

IEEE Trans. Consumer Electron.

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This paper presents a magnetic resonance wireless power transfer (WPT) system that uses three coils, a planar receiver and operates at 6.78 MHz,. Effective power transfer is ensured by establishing an impedance matching condition for this WPT system. A metamaterial (MTM) array having dimensions of 20 cm. 30 cm is also positioned near the load coil to concentrate the magnetic field and enhance the transfer efficiency. The result is a maximal improvement of 27% in the transfer efficiency at a transfer distance of 50 cm. The impact of a ground plane on the transfer efficiency is also examined. By utilizing the MTM array, making slits on the ground plane and increasing the gap between the ground plane and the load coil, it is possible to mitigate this impact. The highest transfer efficiency improvement is about 55% at a distance of 20 cm with the ground plane. A practical laptop model is fabricated to verify the impact of the load coil angle and position on the transfer efficiency. The result shows that the maximum transfer efficiency with the laptop model is 47.58% with the load coil angle of 90 degree(1)

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Section: Introductionmentioning

confidence: 99%

Magnetic resonance wireless power transfer using three-coil system with single planar receiver for laptop applications

Nguyen

Kang

Choi

et al. 2015

IEEE Trans. Consumer Electron.

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“…EMF safety can be achieved through the magnetic field level reduction in the near-field area. Therefore, several reduction methods were presented, such as using ferrite materials [14], metallic materials (aluminum) [178,179], and metamaterials (MM) [180][181][182][183]. Changing the pulse width of the inverter to decrease the harmonics of the leakage electric field was presented [184].…”

Section: Emf and Emi Mitigation Methodsmentioning

confidence: 99%

Magnetically Coupled Resonance WPT: Review of Compensation Topologies, Resonator Structures with Misalignment, and EMI Diagnostics

2018

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Magnetically coupled resonance wireless power transfer systems (MCR WPT) have been developed in recent years. There are several key benefits of such systems, including dispensing with power cords, being able to charge multiple devices simultaneously, and having a wide power range. Hence, WPT systems have been used to supply the power for many applications, such as electric vehicles (EVs), implantable medical devices (IMDs), consumer electronics, etc. The literature has reported numerous topologies, many structures with misalignment effects, and various standards related to WPT systems; they are usually confusing and difficult to follow. To provide a clearer picture, this paper aims to provide comprehensive classifications for the recent contributions to the current state of MCR WPT. This paper sets a benchmark in order to provide a deep comparison between different WPT systems according to different criteria: (1) compensation topologies; (2) resonator structures with misalignment effects; and, (3) electromagnetic field (EMF) diagnostics and electromagnetic field interference (EMI), including the WPT-related standards and EMI and EMF reduction methods. Finally, WPT systems are arranged according to the application type. In addition, a WPT case study is proposed, an algorithm design is given, and experiments are conducted to validate the results obtained by simulations.

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“…최근 통신 신호뿐만 아니라, 전력을 무선으로 전송하기 위한 연구들이 매우 활발히 진행되고 있다 [1]～ [4] . 특히, 자계 결합 무선 전력 전송에 관한 연구가 다방면으로 이루어지고 있는데, 낮은 효율로 인한 문제점이 있다.…”

Section: ⅰ 서 론unclassified

“…이는 두 공진기간 결합 계수가 거리에 따라 급속히 줄어드는 자연 현상에 기 인한다. 이를 극복하기 위해 중계 코일 [2] 또는 음의 유효 투 자율을 가지는 메타물질 [3], [4] 을 이용하여 전송효율을 향상시 키기 위한 연구들이 진행 중이다.…”

Section: ⅰ 서 론unclassified

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Analysis of Elements for Efficiencies in Magnetically-Coupled Wireless Power Transfer System Using Metamaterial Slab

Kim¹,

Oh²,

Lee³

2014

The Journal of Korean Institute of Electromagnetic Engineering

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In this paper, the effects of a metamaterial slab with negative permeability in a magnetically coupled wireless power transfer system (WPT) in the overall performance are analyzed quantitatively in terms of the effective quality factors of the loop resonators and coupling coefficient considering the slab losses, based on an equivalent circuit. Using the ideal metamaterial slab(lossless slab), the WPT efficiency is improved considerably by the magnetic flux focusing. However, the practical lossy slab made of RRs or SRRs limits the significant enhancement of WPT efficiency due to the relatively high losses in the slab consisting of RRs or SRRs near the resonant frequency. For the practical loop resonator, other than a point magnetic charge, using the practical lossy metamaterial slab in order to improve the transfer efficiency, the width of the slab needs to be optimized somewhat less than the half of the distance between two loop resonators. For the low-loss slab with its loss tangent of 0.001, the WPT efficiency is maximized at 93 % when the ratio of the slab width and the distance between the two resonators is approximately 0.35, compared with 53 % for the case without the slab. The efficiency in case of employing the high-low slab(loss tangent: 0.2) is maximized at 61 % when the slab ratio is 0.25.

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Analysis of Wireless Power Transfer Using Metamaterial Slabs Made of Ring Resonators at 13.56MHz

Cited by 19 publications

References 4 publications

Magnetic resonance wireless power transfer using three-coil system with single planar receiver for laptop applications

Magnetic resonance wireless power transfer using three-coil system with single planar receiver for laptop applications

Magnetically Coupled Resonance WPT: Review of Compensation Topologies, Resonator Structures with Misalignment, and EMI Diagnostics

Analysis of Elements for Efficiencies in Magnetically-Coupled Wireless Power Transfer System Using Metamaterial Slab

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