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
Wireless Powering by Magnetic Resonant Coupling: Recent Trends in Wireless Power Transfer System and its Applications
TL;DR: In this article, a comparative study between coupledmode theory (CMT) and reflected load theory (RLT) in case of analyzing the power transmission model of conventional 2-coil resonant coupled WPT with frequency splitting modes is presented.
Journal ArticleDOI
Enabling Seamless Wireless Power Delivery in Dynamic Environments
TL;DR: An overview of methods used to adapt to variations in range, orientation, and load using both wideband and fixed-frequency techniques is provided.
Journal ArticleDOI
Efficiency and Optimal Loads Analysis for Multiple-Receiver Wireless Power Transfer Systems
TL;DR: In this paper, the authors extended the conventional circuit-model-based analysis for the one-receiver system to investigate a general one-transmitter multiple-REceiver system and discussed the influence of the loads and mutual inductance on the system efficiency.
Journal ArticleDOI
Review of Near-Field Wireless Power and Communication for Biomedical Applications
TL;DR: The knowledge reviewed in the paper could provide intuition in the design of various wireless and mobile systems such as wireless body area networks, small-cell 5G cellular, as well as in-body biomedical applications, especially for efficient power and data management and higher security.
Journal ArticleDOI
A Critical Review of Wireless Power Transfer via Strongly Coupled Magnetic Resonances
TL;DR: In this paper, the advantages of SCMR are analyzed by comparing it with the other wireless power transfer (WPT) technologies, and different analytic principles of SCM are elaborated in depth and further compared.
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.