Journal ArticleDOI
Automated Impedance Matching System for Robust Wireless Power Transfer via Magnetic Resonance Coupling
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TLDR
An automated impedance matching (IM) system is proposed to increase the efficiency by matching the resonance frequency of the resonator pair to that of the power source, improving the power transfer efficiency.Abstract:
Recently, a highly efficient midrange wireless transfer technology using electromagnetic resonance coupling has been proposed and has received much attention due to its practical range and efficiency. The resonance frequency of the resonators changes as the gap between the resonators changes. However, when this technology is applied in the megahertz range, the usable frequency is bounded by the industrial, scientific, and medical (ISM) band. Therefore, to achieve maximum power transmission efficiency, the resonance frequency has to be fixed within the ISM band. In this paper, an automated impedance matching (IM) system is proposed to increase the efficiency by matching the resonance frequency of the resonator pair to that of the power source. The simulations and experiments verify that the IM circuits can change the resonance frequency to 13.56 MHz (in the ISM band) for different air gaps, improving the power transfer efficiency. Experiments also verified that automated IM can be easily achieved just by observing and minimizing the reflected wave at the transmitting side of the system.read more
Citations
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A Double-Sided LCC Compensation Network and Its Tuning Method for Wireless Power Transfer
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Skin-integrated wireless haptic interfaces for virtual and augmented reality.
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A Maximum Efficiency Point Tracking Control Scheme for Wireless Power Transfer Systems Using Magnetic Resonant Coupling
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References
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A Comparative Study Between Novel Witricity and Traditional Inductive Magnetic Coupling in Wireless Charging
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Journal ArticleDOI
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TL;DR: In this article, the authors demonstrate that the efficiency of wireless power transfer utilizing resonant coupling is improved by applying the "matching condition", which is achieved by varying the coupling factor between the source (load) and the internal resonator.
Proceedings ArticleDOI
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TL;DR: In this article, the authors show that series resonance in both the sender and the receiver increases the power transfer in weakly coupled series resonators, where the magnetic coupling is weak enough that the effect of the receiver coil on the sender coil can be neglected.
Proceedings ArticleDOI
Basic study of improving efficiency of wireless power transfer via magnetic resonance coupling based on impedance matching
TL;DR: In this article, the possibility of using impedance matching (IM) networks to adjust the resonance frequency of a pair of antennas at a certain distance to 13.56MHz is studied.
Proceedings ArticleDOI
In vitro and in vivo studies on wireless powering of medical sensors and implantable devices
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