Effect of Metamaterial on Characteristics of Inductive Power Transfer Systems

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dc.contributor.advisor Hu, AP en
dc.contributor.author Long, Bo en
dc.date.accessioned 2017-02-26T21:25:02Z en
dc.date.issued 2016 en
dc.identifier.uri http://hdl.handle.net/2292/31973 en
dc.description Full text is available to authenticated members of The University of Auckland only. en
dc.description.abstract Inductive power transfer (IPT) is a wireless power transfer technology based on magnetic field coupling. The power transfer capability of an IPT system decreases with the increase of the power transfer range due to the drop in the coupling coefficient. To extend the power transfer range, metamaterial (MM) is investigated as an artificial structure with passive distributed coils. MM has the ability of concentrating electromagnetic waves due to its negative effective refractive index within a frequency range from several hundred MHz to a few GHz. However, it is not clear whether it is effective for an IPT system which has a typical operating frequency range from kHz to hundreds of kHz. This thesis is to study the effect of MMs on the power transfer performance of IPT systems. Three coil configurations for MMs are proposed, namely Snake (SN), Doublespiral (DSP), and Spiral (SP). Simulation studies have shown that the DSP and SP configurations are more effective than SN configurations for IPT systems, although they have different requirements on the tuning inductances and capacitances at the resonant frequency. By extracting the S-parameters from the software package CST Microwave Studio, the operating frequency range of MMs with negative effective relative permeability are determined, and the operating frequency corresponding to the maximum power transfer is found. Both simulation and experimental results have shown that the power transfer capability can be enhanced by using MMs. The experimental results show that the power transfer capability can be increased 165 times by using DSP MMs and 123 times by using SP MMs compared to the counterparts without MMs. A practical IPT system using a push-pull current fed primary converter, a full-bridge pick-up rectifier, and a 5W LED load is developed for studying the effect of MMs on the power transfer range. Two types of MMs with DSP and SP coils are tested at the system resonant frequencies at 354 kHz and 279 kHz. The experimental results show that both types of MMs can increase the power transfer range by more than 20% of the size of the coil diameter at the same output power. en
dc.publisher ResearchSpace@Auckland en
dc.relation.ispartof Masters Thesis - University of Auckland en
dc.relation.isreferencedby UoA99264936313402091 en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. en
dc.rights Restricted Item. Available to authenticated members of The University of Auckland. en
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm en
dc.rights.uri http://creativecommons.org/licenses/by-nc-sa/3.0/nz/ en
dc.title Effect of Metamaterial on Characteristics of Inductive Power Transfer Systems en
dc.type Thesis en
thesis.degree.discipline Electrical and Electronic Engineering en
thesis.degree.grantor The University of Auckland en
thesis.degree.level Masters en
dc.rights.holder Copyright: The author en
pubs.elements-id 614989 en
pubs.org-id Engineering en
pubs.org-id Department of Electrical, Computer and Software Engineering en
pubs.record-created-at-source-date 2017-02-27 en

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