Compact and Tunable Transmitter and Receiver for Magnetic Resonance Power Transmission to Mobile Objects

Komaru, Takashi; Koizumi, Masayoshi; Komurasaki, Kimiya; Shibata, Takayuki; Kano, Kazuhiko

doi:10.5772/28068

Cited by 14 publications

(13 citation statements)

References 3 publications

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“…In preliminary testing, the impedance ratio of transmission side r T was measured to confirm that the excitation coil can satisfy Equation (2). r T is tunable by adjusting the coupling coefficient between the excitation coil and the transmitter resonator k ET , as [9] 2…”

Section: Sizing Of Resonator and Coilsmentioning

confidence: 99%

Demonstration of Automatic Impedance-Matching and Constant Power Feeding to and Electric Helicopter via Magnetic Resonance Coupling

Yamakawa¹,

Shimamura²,

Komurasaki³

et al. 2014

WET

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Wireless power transfer (WPT) from a transmitter resonator on the ground to an electrically powered miniature heli-copter was attempted to demonstrate WPT using magnetic resonance coupling to an object moving in 3D space. The transmission efficiency was optimized by automatic impedance matching for different flight attitudes: a maximum flight altitude of 590 mm was achieved. Furthermore, an estimation method of transmission efficiency using only the properties on the transmitter side was proposed, with transmission power regulated as constant against the change in the coupling coefficient.

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Section: Sizing Of Resonator and Coilsmentioning

confidence: 99%

Demonstration of Automatic Impedance-Matching and Constant Power Feeding to and Electric Helicopter via Magnetic Resonance Coupling

Yamakawa¹,

Shimamura²,

Komurasaki³

et al. 2014

WET

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“…Considering the power transmission from a resonator with quality factor Q S , impedance Z 0 , and resonance frequency ω 0 to another resonator with Q D , Z 0 , and ω 0 at the AC frequency of ω, then the transmission efficiency can be derived using Kirchhoff's second law as shown below [4].…”

Section: Impedance Matching Theorymentioning

confidence: 99%

“…A formula for the transmission efficiency can be derived from electric circuit theory [4]. Efficiency is expressed as a function of a Figure-of-Merit (fom) fom = kQ under an impedance-matched condition.…”

Section: Introductionmentioning

confidence: 99%

Wireless Power Feeding with Strongly Coupled Magnetic Resonance for a Flying Object

Koizumi¹,

Komurasaki²,

Mizuno³

et al. 2012

WET

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Wireless power feeding was examined with strongly coupled magnetic resonance for an object moving in 3-D space. Electric power was transmitted from the ground to an electrically powered toy helicopter in the air. A lightweight receiver resonator was developed using copper foil. High Q of greater than 200 was obtained. One-side impedance matching the transmitter side was proposed to cope with high transmission efficiency and the receiver’s weight reduction. Results show that the efficiency drop near the ground was drastically improved. Moreover, the measured efficiency showed good agreement with theoretical predictions. A fully equipped helicopter of 6.56 g weight was lifted up with source power of about 5 W to an altitude of approximately 10 cm

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“…For example, the use of spiral resonators has been investigated in [7][8][9][10][11][12]. Alternatively, a capacitor-loaded loop structure may be used as the resonator [13][14][15][16][17]. In this paper, we expand upon the design in [16] and investigate a planarized, capacitor-loaded coupled loop structure for WPT.…”

Section: Introductionmentioning

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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Compact and Tunable Transmitter and Receiver for Magnetic Resonance Power Transmission to Mobile Objects

Cited by 14 publications

References 3 publications

Demonstration of Automatic Impedance-Matching and Constant Power Feeding to and Electric Helicopter via Magnetic Resonance Coupling

Demonstration of Automatic Impedance-Matching and Constant Power Feeding to and Electric Helicopter via Magnetic Resonance Coupling

Wireless Power Feeding with Strongly Coupled Magnetic Resonance for a Flying Object

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

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