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Wireless Power Transmission Topology using Capacitively Coupled Open-Ended Helical Resonators
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- Author / Creator
- Domingos, Fabiano Cezar
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Wireless power transfer (WPT) is an innovative technology seeking to revolutionize how electronic devices are employed by addressing restrictions caused by wired connections and limited battery autonomy. Although the fundamentals of WPT have been known for more than a century, the recent application in wireless charging of mobile phones has been the first widespread utilization of these systems. This fact supports further research efforts to foster the development of novel, robust, and efficient WPT methods. This thesis investigates the design of resonant WPT systems using electromagnetic field coupling in the reactive near-field region. The first part of this thesis comprises the study of inductive and capacitive WPT topologies based on circuit analysis. Three parameters are used to evaluate each configuration: power transmission capability, frequency of maximum power transfer, and robustness to increased distances between transmitter and receiver devices. Then, the theory of open-ended helical resonators (OEHR) is presented, explaining how they can be utilized for efficient implementation of wireless power transmission systems. A novel WPT topology is proposed, consisting of capacitively coupled OEHRs. This new circuit is evaluated based on measurements, electromagnetic simulations, and equivalent circuits. Results show that the proposed system has enhanced misalignment tolerance. Finally, the inefficiency of conventional rectifiers in WPT applications operating in MHz frequencies is addressed. The use of a Class E full-wave rectifier with a capacitive power transfer system is presented, including a design procedure to calculate the required compensation circuits. The results show that this approach can lead to higher efficiencies than a regular full-bridge rectifier, for example, resulting in improved wireless power transfer capabilities.
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- Subjects / Keywords
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- Graduation date
- Spring 2019
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- Type of Item
- Thesis
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- Degree
- Master of Science
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- License
- Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.