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Experimental demonstration of multi-watt wireless power transmission to ferrite-core receivers at 6.78 MHz

Published online by Cambridge University Press:  11 December 2018

Stasiu Chyczewski ,
Seahee Hwangbo ,
Yong-Kyu Yoon  and
David P. Arnold Open the ORCID record for David P. Arnold [Opens in a new window]
Stasiu Chyczewski
Affiliation:
Department of Electrical and Computer Engineering, University of Florida, Gainesville, FL, USA
Seahee Hwangbo
Affiliation:
Department of Electrical and Computer Engineering, University of Florida, Gainesville, FL, USA
Yong-Kyu Yoon
Affiliation:
Department of Electrical and Computer Engineering, University of Florida, Gainesville, FL, USA
David P. Arnold*
Affiliation:
Department of Electrical and Computer Engineering, University of Florida, Gainesville, FL, USA
*
Corresponding author: D. P. Arnold Email: darnold@ufl.edu
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Abstract

This article experimentally explores the use of ferrite cores to miniaturize the receivers used for inductive wireless power transmission. A variety of receivers were designed and fabricated using cylindrical ferrite cores, ranging in total size from 47 to 687 mm3. The receivers were tested with a commercially available transmitter operating under the Rezence (Air Fuel Alliance) standard at 6.78 MHz. Experiments measured performance of the receivers in terms of their maximum power draw and efficiency as functions of the receiver load and transmission distance. Experimental results showed that ferrite-core receivers could draw multiple watts of power with end-to-end efficiencies in excess of 50%. While the efficiencies are less than a commercially planar coil receiver, the ferrite-core receivers offer a >50% reduction in mass and >90% reduction in footprint. As a result, the receiver power densities reach up to 17.6 W/cm3, which is a 25× improvement over previously reported work. This effort confirms the viability of ferrite-core receivers for size- and weight-constrained applications.

Keywords

Ferrite coreWireless power
Type
Research Article
Information
Wireless Power Transfer , Volume 6 , Issue 1 , March 2019 , pp. 17 - 25
Copyright
Copyright © Cambridge University Press 2018 

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