Effect of Coupling Between Multiple Transmitters or Multiple Receivers on Wireless Power Transfer

Ahn, Do-Seob; Hong, Songcheol

doi:10.1109/tie.2012.2196902

Cited by 330 publications

(133 citation statements)

References 37 publications

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“…The WPT using magnetic resonant coupling can improve the power transfer efficiency (PTE) or extend the service range compared with inductively coupled systems. To improve the PTE, researchers have used various methods, such as impedance matching [3,4], adjusting the coupling among multiple transmitters (TXs) or multiple receivers (RXs) [5], and applying the optimum condition of the values of phase difference and amplitude ratio between two adjacent TXs [6], among others.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Optimization of Wireless Power Transfer Efficiency Considering the Tilt Angle of a Coil

Huang

2018

J Electromagn Eng Sci

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Wireless power transfer (WPT) based on magnetic resonant coupling is a promising technology in many industrial applications. Efficiency of the WPT system usually depends on the tilt angle of the transmitter or the receiver coil. This work analyzes the effect of the tilt angle on the efficiency of the WPT system with horizontal misalignment. The mutual inductance between two coils located at arbitrary positions with tilt angles is calculated using a numerical analysis based on the Neumann formula. The efficiency of the WPT system with a tilted coil is extracted using an equivalent circuit model with extracted mutual inductance. By analyzing the results, we propose an optimal tilt angle to maximize the efficiency of the WPT system. The best angle to maximize the efficiency depends on the radii of the two coils and their relative position. The calculated efficiencies versus the tilt angle for various WPT cases, which change the radius of RX (r2 This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. ⓒ

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Section: Introductionmentioning

confidence: 99%

Analysis and Optimization of Wireless Power Transfer Efficiency Considering the Tilt Angle of a Coil

Huang

2018

J Electromagn Eng Sci

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“…The efficiency of the energy exchange depends on the characteristic parameters for each resonator and the energy coupling rate between them. The dynamics of the two resonator system can be described using coupled-mode theory [11], or from an analysis of a circuit equivalent of the coupled system of resonators shown in Fig. 3.…”

Section: Wireless Transfer Powermentioning

confidence: 99%

Design and Comparison Wireless Power Transfer Base on Copper (Cu) and Aluminium (Al) Rings Loop Magnetic Coupling

Supriyanto¹,

Wulandari²,

Suhendar³

2016

IJIEE

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Abstract-Magnetically coupled coils have been widely used for a variety of applications requiring contactless or wireless power transfer (WPT). In this paper, the wireless power transfer (WPT) using Copper (Cu) and Aluminium (Al) as magnetic coupling is designed, fabricated and measured. A main problem of wireless power transfer (WPT) is about low efficiency. As state of the art, this research will investigate the effects of the use of copper and aluminum as magnetic coupling. A Copper (Cu) and Aluminium (Al) are used as transmitter (Tx) and receiver (Rx) vice versa. A power analysis has been carried out to identify the efficiency system. The measurement result shown that the wireless power transfer (WPT) using aluminum as transmitter (Tx) and receiver (Rx) have the highest efficiency. The overall efficiency of the power being transferred is about 7,51%-10,8% at distance 20 cm. This research shown that aluminum can consider as a material for the wireless power transfer with magnetic induction method.Index Terms-Wireless power transfer, receiver, transmitter, copper, aluminium. I. INTRODUCTIONNowadays, magnetically coupled coils have been widely used for a variety of applications requiring contactless or wireless power transfer (WPT). Tesla has demonstrated that, for a pair of magnetically coupled resonators with one used as a transmitting unit and the other as receiving unit, optimal wireless power transfer could occur at the resonance frequency of the resonators [1]. A pair of L-C loop resonators for wireless power transfer proposed by Tesla shown in Fig. 1.The most popular wireless power transfer technique used in biomedical implanted devices is near-field inductive coupling. Researches have indicated that if near-field techniques are used and if the range of energy transfer distance is of the order of tens of centimeters, the overall efficiency of the power being transferred is only about 1%-2% [2].The magnetically coupled resonators were presented for wireless power transfer. It now becomes possible to transmit power efficiently at ranges longer than that realized using inductive coupling schemes [3]. For low-power applications, wireless power transfer has found applications in battery charging for portable electronic products such as mobile phones [4]- [7], and mobile laptop charging [8], [9].In Fig. 2 show, typical exponential decay curve of the efficiency as a function of transmission distance for wireless Manuscript received August 21, 2015; revised January 6, 2016. The authors are with Telecommunication Engineering, State Polytechnic of Jakarta, Depok, West Java, Indonesia (e-mail: totosupr@yahoo.com).power transfer (WPT). A main problem of wireless power transfer (WPT) is about low efficiency. As state of the art, this research will investigate the effects of the use of copper and aluminum as magnetic coupling. II. WIRELESS TRANSFER POWERIf two resonators are placed in proximity to one another such that there is coupling between them, it becomes possible for the resonators to exchange energy. The effi...

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“…We distinguish between two classes of work: The first class can deal with a small receiver coil that fits in the back of a phone or the strap of a smartwatch and achieve a maximum distance of 10 cm [26,27,28,29]. The second class can deliver power at larger ranges up to 30cm [30,31,32], but they require large receiver coils that could not possibly fit on the back of a phone or wearable. In addition, both classes assume the receiver coil is aligned with the transmitter coil, and do not deal with different receiver orientations with respect to the transmitter.…”

Section: Related Workmentioning

confidence: 99%

Wireless Power Hotspot that Charges All of Your Devices

Shi

Kabelac

Katabi

et al. 2015

Proceedings of the 21st Annual International Conference on Mobile Computing and Networking

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Each year, consumers carry an increasing number of gadgets on their person: mobile phones, tablets, smartwatches, etc. As a result, users must remember to recharge each device, every day. Wireless charging promises to free users from this burden, allowing devices to remain permanently unplugged. Today's wireless charging, however, is either limited to a single device, or is highly cumbersome, requiring the user to remove all of her wearable and handheld gadgets and place them on a charging pad.This paper introduces MultiSpot, a new wireless charging technology that can charge multiple devices, even as the user is wearing them or carrying them in her pocket. A MultiSpot charger acts as an access point for wireless power. When a user enters the vicinity of the MultiSpot charger, all of her gadgets start to charge automatically. We have prototyped MultiSpot and evaluated it using off-theshelf mobile phones, smartwatches, and tablets. Our results show that MultiSpot can charge 6 devices at distances of up to 50 cm.

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Effect of Coupling Between Multiple Transmitters or Multiple Receivers on Wireless Power Transfer

Cited by 330 publications

References 37 publications

Analysis and Optimization of Wireless Power Transfer Efficiency Considering the Tilt Angle of a Coil

Analysis and Optimization of Wireless Power Transfer Efficiency Considering the Tilt Angle of a Coil

Design and Comparison Wireless Power Transfer Base on Copper (Cu) and Aluminium (Al) Rings Loop Magnetic Coupling

Wireless Power Hotspot that Charges All of Your Devices

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