Investigation of Adaptive Matching Methods for Near-Field Wireless Power Transfer

Park, Jong-Min; Tak, Youndo; Kim, Yoongoo; Kim, Youngwook; Nam, Sangwook

doi:10.1109/tap.2011.2123061

Cited by 185 publications

(98 citation statements)

References 5 publications

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“…When the AC source is 5 V and load resistance is 20 Ω, the transmission efficiency can be obtained by (6). In the domino MCR-WPT system, the amplitude curve of the load voltage jV L j and transmission efficiency of the system at different operating frequencies are calculated by Wolfram Mathematica software, as shown in Fig.…”

Section: Parametric Analysis Of Traditional Domino Wpt Systemmentioning

confidence: 99%

“…The transmission distance and efficiency of the MCR-WPT systems are common research subjects. Single-source and single-load systems with impedance matching and frequency tracking have been researched extensively in regards to improve transmission efficiency in the mid-range MCR-WPT systems [5,6]. In [7], defined the mid-range the MCR-WPT systems of wireless power transfer as transmission distance r any greater than three times the diameter d of the primary or secondary; that is, d=r > 3, and the transmission efficiency decays exponentially as the transfer distance increases.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Parametric Analysis Of Traditional Domino Wpt Systemmentioning

confidence: 99%

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

View full text Add to dashboard Cite

show abstract

“…However, if we follow the tilted ridge in dark red (61% at 1 m and 395 pF, 63% at 0.75 m and 388 pF, and 65% at 0.5 m and 381 pF), higher PTE can be maintained. Therefore, by simultaneously tuning the variable capacitor of both the Tx and Rx, improved matching and higher PTE can be obtained at distances closer than 1 m. This approach is different from the frequency-tracking technique in [7,9] where the source frequency is changed to track the resonant frequency-splitting that occurs when Tx and Rx are close. Instead, the source frequency can be kept constant while both capacitors are tuned to track the distance-varying input impedance.…”

Section: Tuning Capabilitiesmentioning

confidence: 99%

“…This has generated much recent work to design WPT structures in a reduced form factor [7][8][9][10][11][12][13][14][15][16][17]. For example, the use of spiral resonators has been investigated in [7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Wireless Power Transfer Using Planarized, Capacitor-Loaded Coupled Loops

Li¹,

Ling²

2014

PIER

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Abstract-A capacitor-loaded coupled loop structure is investigated for wireless power transfer at 6.78 MHz for a target transmission distance of 1 m. It is shown that the optimal configuration for this structure occurs when the coupled loops are coplanar. Therefore, by converting thick wires into wide strips, a planarized configuration can be achieved. Simulation results are verified in measurement, which shows a 60% overall power transfer efficiency at 1 m. The contribution of different loss mechanisms is examined. Next, power transfer efficiency in the presence of dielectric materials is investigated in simulation and measurement. Additionally, tuning capabilities that arise from the implementation of variable capacitors are shown. Finally, design space exploration is performed to examine design tradeoffs.

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“…The rapid decay of system efficiency with respect to transmission distance however means that even resonantly-coupled systems must be carefully designed in order to ensure that as much power as possible is transferred from the source to the desired end target. There are many factors influencing the transmission efficiency, and there have been studies that investigate the effects of frequency splitting [1,2], repeater coils [3,4], adaptive impedance matching techniques [5,6] and metamaterials [7].…”

Section: Introductionmentioning

confidence: 99%

Investigation of High-Efficiency Wireless Power Transfer Criteria of Resonantly-Coupled Loops and Dipoles through Analysis of the Figure of Merit

2015

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The efficiency of a Wireless Power Transfer (WPT) system is greatly dependent on both the geometry and operating frequency of the transmitting and receiving structures. By using Coupled Mode Theory (CMT), the figure of merit is calculated for resonantly-coupled loop and dipole systems. An in-depth analysis of the figure of merit is performed with respect to the key geometric parameters of the loops and dipoles, along with the resonant frequency, in order to identify the key relationships leading to high-efficiency WPT. For systems consisting of two identical single-turn loops, it is shown that the choice of both the loop radius and resonant frequency are essential in achieving high-efficiency WPT. For the dipole geometries studied, it is shown that the choice of length is largely irrelevant and that as a result of their capacitive nature, low-MHz frequency dipoles are able to produce significantly higher figures of merit than those of the loops considered. The results of the figure of merit analysis are used to propose and subsequently compare two mid-range loop and dipole WPT systems of equal size and operating frequency, where it is shown that the dipole system is able to achieve higher efficiencies than the loop system of the distance range examined.

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Investigation of Adaptive Matching Methods for Near-Field Wireless Power Transfer

Cited by 185 publications

References 5 publications

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

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

Investigation of Wireless Power Transfer Using Planarized, Capacitor-Loaded Coupled Loops

Investigation of High-Efficiency Wireless Power Transfer Criteria of Resonantly-Coupled Loops and Dipoles through Analysis of the Figure of Merit

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