Effects of Magnetic Coupling of Nonadjacent Resonators on Wireless Power Domino-Resonator Systems

Lee, Chi Kwan; Zhong, Wenxing; Hui, S.Y.R.

doi:10.1109/tpel.2011.2169460

Cited by 266 publications

(111 citation statements)

References 22 publications

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“…In [7], Lee et al proposed a method of relay resonators arranged in domino forms. It is observed that power transmission range and efficiency was extended greatly.…”

Section: Introductionmentioning

confidence: 99%

Metamaterial-Based High-Efficiency Wireless Power Transfer System at 13.56 MHZ for Low Power Applications

Chen¹,

Zhixia²,

Hu³

et al. 2017

PIER B

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Abstract-Magnetically coupled resonant wireless power transfer (WPT) has been employed in many applications, including wireless charging of portable electronic devices, electric vehicles and powering of implanted biomedical devices. However, transmission efficiency decreases sharply due to divergence of magnetic field, especially in under coupled region. Electromagnetic (EM) metamaterial (MM) can manipulate the direction of EM fields due to its abnormal effective permittivity or permeability. In this paper, an ultra-thin and extremely sub-wavelength magnetic MM is designed for a 13.56 MHz WPT system to enhance magnetic field and its power transfer efficiency (PTE). The WPT systems are investigated theoretically, experimentally and by simulation. A relatively high maximum efficiency improvement of 41.7% is obtained, and the range of efficient power transfer can be greatly extended. The proposed MM structure is very compact and ultra-thin in size compared with early publications for some miniaturized applications. In addition, large area, homogeneous magnetic field is obtained and discussed using the proposed MM. Finally, the proposed MM is applied in a more practical WPT system (with a low power light bulb load) to reveal its effects. The bulb brightness intuitively verifies the efficiency improvement in the WPT system with the MM.

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“…In [7], Lee et al proposed a method of relay resonators arranged in domino forms. It is observed that power transmission range and efficiency was extended greatly.…”

Section: Introductionmentioning

confidence: 99%

Metamaterial-Based High-Efficiency Wireless Power Transfer System at 13.56 MHZ for Low Power Applications

Chen¹,

Zhixia²,

Hu³

et al. 2017

PIER B

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show abstract

“…A Domino-Resonator System working in the operating frequency of 500 kHz can increase the transmission distance [15]. The path can be flexibly adjusted by rearranging the relay coils [16,17]. These studies overlooked the effects of cross-coupling, which introduces frequency drift into the system.…”

Section: Introductionmentioning

confidence: 99%

A novel dumbbell-shaped coil featured with cross coupling suppression for long distance relay wireless power transfer applications

Zhang

Luo

et al. 2017

IEICE Electron. Express

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The use of multi-resonators for medium-range wireless power transfer (WPT) systems is an important concern; the cross-couplings between non-adjacent coils have an adversely impact on the transmission distance and efficiency of the system. This paper proposes a dumbbell-shaped (DS) coil in a WPT system. The DS coil structure was analyzed theoretically and verified experimentally. The proposed scheme eliminates cross-couplings between non-adjacent coils in the multiple resonator system to resolve frequency drift, and improve the transmission distance and efficiency in the multiple resonator system. The scheme features a coplanar structure which can secure direct-coupling and save space when applied in the home, office, and public areas.

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“…Several methods have been employed to increase the range, notably the use of passive, resonant, relay coils to increase the oscillating magnetic flux at the receiving antenna. There are two main configurations for relays that have been studied -axial [7] and planar [8,9]. Such relay coil arrays are identical to metamaterial structures.…”

Section: Introductionmentioning

confidence: 99%

A magneto-inductive wave wireless power transfer device

Stevens

2015

Wirel Pow Transfer

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A magneto-inductive wave wireless power transfer device christopher j. stevensMagneto-inductive waves are a form of propagation which only exists in certain types of magnetic metamaterials formed from inductively coupled resonant circuits. We present an investigation of their potential as contactless power transfer devices capable of carrying power along a surface between suitably prepared terminals while simultaneously offering a broadband data channel. Input impedances and their matching conditions are explored with a view to offering a simple power system design. A device with 75% peak and 40% minimum efficiency is demonstrated and designs with potential for better than 70% mean and 90% peak are reported. The product of planar magnetic coupling and metamaterial cell Q factor is determined to be a key optimization parameter for high efficiency.

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Effects of Magnetic Coupling of Nonadjacent Resonators on Wireless Power Domino-Resonator Systems

Cited by 266 publications

References 22 publications

Metamaterial-Based High-Efficiency Wireless Power Transfer System at 13.56 MHZ for Low Power Applications

Metamaterial-Based High-Efficiency Wireless Power Transfer System at 13.56 MHZ for Low Power Applications

A novel dumbbell-shaped coil featured with cross coupling suppression for long distance relay wireless power transfer applications

A magneto-inductive wave wireless power transfer device

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