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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Journal ArticleDOI
Design of a High-Efficiency Wireless Power Transfer System With Intermediate Coils for the On-Board Chargers of Electric Vehicles
TL;DR: In this article, a high efficiency inductive wireless power transfer system for the on-board chargers of electric vehicles is proposed, which adopts two additional intermediate coils with resonant capacitors, which increases the effective magnetizing impedance between the transmitter and receiver coils with no ferrites.
Journal ArticleDOI
Design of Maximum Efficiency Tracking Control Scheme for Closed-Loop Wireless Power Charging System Employing Series Resonant Tank
TL;DR: In this article, a maximum efficiency tracking control scheme for a closed-loop wireless power charging (WPC) system for wireless charging of mobile devices is presented. But the proposed system has the drawback of efficiency degradation.
Journal ArticleDOI
An overview of metamaterials and their achievements in wireless power transfer
Kai Sun,Kai Sun,Kai Sun,Runhua Fan,Xi-hua Zhang,Zidong Zhang,Zhicheng Shi,Ning Wang,Peitao Xie,Zhongyang Wang,Guohua Fan,Hu Liu,Chuntai Liu,Tingxi Li,Chao Yan,Zhanhu Guo +15 more
TL;DR: In this article, the authors provide an overview of the fabrications, exotic properties, and their applications especially in the wireless power transfer (WPT) field, while the perspective and future challenges of metamaterials and WPT are proposed.
Journal ArticleDOI
Compensation of Cross Coupling in Multiple-Receiver Wireless Power Transfer Systems
TL;DR: This paper aims at providing a general analysis on the multiple-receiver WPT systems and compensation for the influence of the cross coupling and shows that theoretically by having derived optimal load reactances, the important system characteristics can be preserved.
Journal ArticleDOI
Selective Wireless Power Transfer for Smart Power Distribution in a Miniature-Sized Multiple-Receiver System
TL;DR: A selective WPT technique using magnetic resonance coupling (MRC) is introduced for smart power delivery in a multiple-receiver system, eliminating the cross-coupling effect and unbalanced power division problem across the receivers.
References
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Journal ArticleDOI
Wireless Power Transfer via Strongly Coupled Magnetic Resonances
Andre B. Kurs,Aristeidis Karalis,Robert Moffatt,John D. Joannopoulos,Peter H. Fisher,Marin Soljacic +5 more
TL;DR: A quantitative model is presented describing the power transfer of self-resonant coils in a strongly coupled regime, which matches the experimental results to within 5%.
Journal ArticleDOI
Analysis, Experimental Results, and Range Adaptation of Magnetically Coupled Resonators for Wireless Power Transfer
TL;DR: A circuit model is presented along with a derivation of key system concepts, such as frequency splitting, the maximum operating distance (critical coupling), and the behavior of the system as it becomes undercoupled, including the introduction of key figures of merit.
Journal ArticleDOI
Efficient wireless non-radiative mid-range energy transfer
TL;DR: In this article, the physical phenomenon of long-lifetime resonant electromagnetic states with localized slowly-evanescent field patterns was investigated to transfer energy efficiently over non-negligible distances even in the presence of extraneous environmental objects.
Journal ArticleDOI
Design considerations for a contactless electric vehicle battery charger
TL;DR: This paper overviews theoretical and practical design issues related to inductive power transfer systems and verifies the developed theory using a practical electric vehicle battery charger.
Journal ArticleDOI
Power Waves and the Scattering Matrix
TL;DR: In this paper, the physical meaning and prop-erties of the power waves defined by [Equation], [ Equation] where V/sub i/ and Z/sub I/ are the voltage at and the current flowing into the ith port of a junction and the impedance of the circuit connected to the it h port.