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
Modelling and control design of reconfigurable wireless power transfer system for transmission efficiency maximisation and output voltage regulation
Yuan Cao,Jaber A. Abu Qahouq +1 more
TL;DR: The modelling, control design and stability evaluation of a reconfigurable WPT (R-WPT) system which can achieve constant receiver/load's voltage/power and realises transmission efficiency maximisation under varying transmission distances (DIS) and misalignment (MIS) conditions in addition to varying load conditions is presented.
Journal ArticleDOI
Random Energy Beamforming for Magnetic MIMO Wireless Power Transfer System
TL;DR: A random MagBF method to achieve maximum received power efficiency and simplify the system architecture is proposed, which is computationally light and requires only limited feedback information, which avoids complex channel estimation or AC measurements.
Journal ArticleDOI
An Impedance Decoupling-Based Tuning Scheme for Wireless Power Transfer System Under Dual-Side Capacitance Drift
Kai Song,Guang Yang,Hang Zhang,Xiaoliang Huang,Jinhai Jiang,Lan Yu,Xiaohua Huang,Jin Li,Chunbo Zhu +8 more
TL;DR: In this paper, a tuning scheme against dual-side capacitance drift using the impedance decoupling algorithm is investigated, where the primary and secondary reactances are decoupled from the total impedance.
Journal ArticleDOI
Performance analysis of series/parallel and dual side LCC compensation topologies of inductive power transfer for EV battery charging system
TL;DR: The results convey that the efficiency of dual side LCC compensation is higher than that of S/P compensation at variable mutual inductance (misalignment), and the design and modeling steps of inductive power transfer for electric vehicle battery charging system are presented.
Journal ArticleDOI
Obtaining Maximum Efficiency of Inductive Power-Transfer System by Impedance Matching Based on Boost Converter
TL;DR: Simulation and experimental results have demonstrated that the proposed IM method can help achieve the maximum power-transfer efficiency under a wide range of load variations.
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.