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
Tunable Class $E^2$ DC–DC Converter With High Efficiency and Stable Output Power for 6.78-MHz Wireless Power Transfer
TL;DR: In this article, an L-type impedance matching network (IMN) was proposed to improve the performance of the Class $E^2$ DC-DC converter with and without the fixed/tunable IMN, and the experimental results show that both high efficiency and stable output power are maintained for the tunable converter when there are variations in the DC load and coil coupling.
Journal ArticleDOI
Design approach for a wireless power transfer system for wristband wearable devices
Yaser M. Roshan,Edward J. Park +1 more
TL;DR: The proposed wireless power transfer (WPT) system design is analysed in terms of positioning the power transmitter coil on a bed, while performing the power transfer during a sleeping period of the wearer.
Journal ArticleDOI
Analysis of efficiency improvement in wireless power transfer system
TL;DR: The key features of the proposed work are: attaining load modulation and voltage regulation with reduced size of the system; elimination of communication between active bridges and simple control logic; and optimal PSAs for maximum efficiency.
Proceedings ArticleDOI
A proposal on wireless power transfer for medical implantable applications based on reviews
TL;DR: The current achievements and challenges of wireless capsule endoscopy are reviewed and analyzed and a research directions and WPT consideration in designing a WPT system for implantable medical applications are proposed.
Journal ArticleDOI
Modelling and practical implementation of 2-coil wireless power transfer systems
TL;DR: The modelling, design, and implementation of a 2-coil WPT system, including the coil design, digital frequency generation, and high frequency power electronics, is represented in this paper.
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.