Next Article in Journal
Who Is Behaving? Consequences for Energy Policy of Concept Confusion
Next Article in Special Issue
Software-Based Wireless Power Transfer Platform for Various Power Control Experiments
Previous Article in Journal
Performance Comparison between Steam Injected Gas Turbine and Combined Cycle during Frequency Drops
Previous Article in Special Issue
An Integrated Chip High-Voltage Power Receiver for Wireless Biomedical Implants
Article Menu

Export Article

Open AccessArticle
Energies 2015, 8(8), 7593-7617; doi:10.3390/en8087593

A Dynamically Adaptable Impedance-Matching System for Midrange Wireless Power Transfer with Misalignment

Department of Electronics and Radio Engineering, Kyung Hee University, 1 Sochen, Giheung, Yongin, Gyeonggi 446-701, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: K. T. Chau
Received: 8 June 2015 / Revised: 14 July 2015 / Accepted: 15 July 2015 / Published: 27 July 2015
(This article belongs to the Special Issue Wireless Power Transfer)

Abstract

To enable the geometrical freedom envisioned for wireless power transfer (WPT), fast dynamic adaptation to unpredictable changes in receiver position is needed. In this paper, we propose an adaptive impedance-searching system that achieves good impedance matching quickly. For fast and robust operation, the proposed method consists of three steps: system calibration, coarse search, and fine search. The proposed WPT system is characterized using distance variation and lateral and angular misalignment between coils. The measured results indicate that the proposed method significantly reduces searching time from a few minutes to approximately one second. Furthermore, the proposed system achieves impedance matching with good accuracy. The robust impedance-searching capability of the proposed system significantly improves power transfer efficiency. At 6.78 MHz, we achieve a maximum efficiency of 89.7% and a high efficiency of >80% up to a distance of 50 cm. When the center-to-center misalignment is 35 cm, the efficiency is improved from 48.4% to 74.1% with the proposed method. At a distance of 40 cm, the efficiency is higher than 74% for up to 60° of angular rotation. These results agree well with the simulated results obtained using a lumped-element circuit model. View Full-Text
Keywords: wireless power transmission; resonant coupling; impedance match; dynamic adaptation; efficiency; misalignment wireless power transmission; resonant coupling; impedance match; dynamic adaptation; efficiency; misalignment
Figures

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Duong, T.P.; Lee, J.-W. A Dynamically Adaptable Impedance-Matching System for Midrange Wireless Power Transfer with Misalignment. Energies 2015, 8, 7593-7617.

Show more citation formats Show less citations formats

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Energies EISSN 1996-1073 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top