A Dynamic Solution to Spatial Misalignment in Strongly Coupled Magnetic Resonance Wireless Power Transfer Systems

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  • Spatial misalignment is the leading cause of power transfer efficiency loss in a wireless power system; the misalignment causes the magnetic coupling of the system to change, resulting in a non-optimal load impedance. This research work presents the design and evaluation of an adaptive, near-field transmitter that can maintain the system efficiency when spatial misalignment occurs. The design consists of a power amplifier, a directional coupler, a tuneable impedance matching network, a gain-phase detector, and a microcontroller. An algorithm was created to determine the varying load impedance; another modified the configuration of the tuneable matching network for one that can match to the new load impedance. The developed class EF2 power amplifier delivered 7.5 W of power to the load, with a drain efficiency of 82.4%, at 13.56 MHz. The adaptive transmitter prototype maintained an average of 55% system efficiency for a separation distance of 1.5 cm to 3 cm.

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  • Copyright © 2019 the author(s). Theses may be used for non-commercial research, educational, or related academic purposes only. Such uses include personal study, research, scholarship, and teaching. Theses may only be shared by linking to Carleton University Institutional Repository and no part may be used without proper attribution to the author. No part may be used for commercial purposes directly or indirectly via a for-profit platform; no adaptation or derivative works are permitted without consent from the copyright owner.
Date Created
  • 2019


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