Reconfigurable wireless power transfer systems with high energy efficiency over wide load range
File(s)
Accepted version
Author(s)
Zhong, W
Hui, SYR
Type
Journal Article
Abstract
Optimum energy efficiency in a wireless power transfer (WPT) system usually occurs only at a specific load value while the load such as a battery is normally not constant. A major challenge in WPT is therefore to achieve high energy efficiency over a wide load range. Previously, impedance transformation methods such as DC-DC converters and use of a relay coil, have been used to transform the practical load resistance to the optimum (or near optimum) value. In this paper, a new approach based on re-configurable magnetic resonant structures is proposed to achieve high energy efficiency and low volt-amp ratings. This basic principle is to create more than one efficiency-load curve. The WPT system is controlled to be operated within the top regions of the energy efficiency curves of the reconfigurable circuits so that high energy efficiency can be achieved over a very wide load range. The principle of this new approach is explained with an analysis and verified with practical measurements.
Date Issued
2018-07-01
Date Acceptance
2017-07-16
Citation
IEEE Transactions on Power Electronics, 2018, 33 (7), pp.6379-6390
ISSN
0885-8993
Publisher
Institute of Electrical and Electronics Engineers
Start Page
6379
End Page
6390
Journal / Book Title
IEEE Transactions on Power Electronics
Volume
33
Issue
7
Copyright Statement
© 2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Subjects
0906 Electrical And Electronic Engineering
Electrical & Electronic Engineering
Publication Status
Published
Date Publish Online
2017-09-01