NDLI: An Investigation Into the Use of Orthogonal Winding in Loosely Coupled Link for Improving Power Transfer Efficiency Under Coil Misalignment

Content Provider	IEEE Xplore Digital Library
Author	Chow, J.P.W. Nan Chen Chung, H.S.H. Chan, L.L.H.
Copyright Year	1986
Abstract	It is sometimes unavoidable to use loosely coupled coils in applications, like biomedical devices, for transferring electric energy wirelessly. However, coil misalignment causes degradation of the power transfer efficiency. It is well known that the power transfer efficiency of classical parallel coils is primarily determined by the quality factors of the coils and the coupling coefficient between the coils, and is maximized by choosing an optimal turns-ratio between the coils. Changing the number of turns of the coils cannot effectively overcome such misalignment effect. This paper presents a structure that comprises two orthogonally placed windings for lessening the variation of the coupling coefficient due to the coil misalignment. An output current summing technique that keeps the windings concurrently energized and combines the output currents of the windings will be studied. A canonical model will also be derived to describe the interactions between the coils. An experimental prototype has been built and evaluated on a test bed, which allows different degrees of lateral and angular misalignments. Results reveal that the proposed structure can effectively increase the minimum efficiency zone, allowing more lateral and angular misalignments. These investigations lay the foundation for future understanding more complex loosely coupled winding structures.
Sponsorship	IEEE Power Electronics Society
Starting Page	5632
Ending Page	5649
Page Count	18
File Size	2222058
File Format	PDF
ISSN	08858993
Volume Number	30
Issue Number	10
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Coils Windings Couplings Transmitters Magnetic flux Wireless communication Receivers coil misalignments Wireless inductive link wireless power transfer winding structure Coil misalignments wireless inductive link
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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