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

TitleExperimental demonstration of multi-watt wireless power transmission to ferrite-core receivers at 6.78 MHz
Publication TypeJournal Article
Year of Publication2019
AuthorsChyczewski, S., S. Hwangbo, Y-K. Yoon, and D. P. Arnold
JournalWireless Power Transfer
Volume6
Issue1
Pagination17 - 25
Date PublishedJan-03-2019
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.

URLhttps://www.cambridge.org/core/product/identifier/S2052841818000064/type/journal_article
DOI10.1017/wpt.2018.6
Short TitleWirel Pow Transfer