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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Book ChapterDOI
Wireless Power Transfer Solutions for ‘Things’ in the Internet of Things
Tim Helgesen,Moutaz Haddara +1 more
TL;DR: It is suggested that in theory, WPT can indeed be used to solve IoT’s intelligent devices, or “things”, charging and power challenges, but it is found that human exposure and safety, industrial context, environmental issues, and cost of technology are important factors that could affect WPT adoption in organizations.
Proceedings ArticleDOI
Time-weighted Average Efficiency Optimization for Reconfigurable IPT system with CC and CV outputs
TL;DR: In this article, the authors proposed a reconfigurable-topology for a three-coil circuit, which converts the system from constant current (CC) mode into constant voltage (CV) mode, and by utilizing the optimized coupling ratio into the three-coupled circuit, the efficiency for CV mode can be maximized.
Journal ArticleDOI
A Switchable- LCL -Circuit-Based IPT System With High Efficiency for Reefer Containers
TL;DR: The idea of this letter is to use the SLC to create multiple efficiency-load curves, then to regulate the peak points of the curves approaching the IRPs by reconfiguring the compensation parameters, and a prototype was built to validate the performance of the proposed approach.
Proceedings ArticleDOI
Power efficiency improvement of wireless power transfer using magnetic material
TL;DR: In this paper, the efficiency improvement of wireless power transfer system is studied using ferrite bars with keeping distance of electric power transmission, experiments are performed to decide how and where to install them.
Journal ArticleDOI
Explicit Design of Impedance Matching Networks for Robust MHz WPT Systems With Different Features
TL;DR: In this article , an explicit impedance matching network (IMN) was proposed to enhance the robustness of WPT systems against variations in their final load and coil coupling. But the performance of an experimental 6.78-MHz WPT system was investigated under largely varied final load (10−50 $\mathbf{\Omega }$ ) and coils coupling (0−53%).
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.