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Journal Article Wireless Energy Transfer System with Multiple Coils via Coupled Magnetic Resonances
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Authors
Sanghoon Cheon, Yong-Hae Kim, Seung-Youl Kang, Myung Lae Lee, Taehyoung Zyung
Issue Date
2012-08
Citation
ETRI Journal, v.34, no.4, pp.527-535
ISSN
1225-6463
Publisher
한국전자통신연구원 (ETRI)
Language
English
Type
Journal Article
DOI
https://dx.doi.org/10.4218/etrij.12.0111.0461
Abstract
A general equivalent circuit model is developed for a wireless energy transfer system composed of multiple coils via coupled magnetic resonances. To verify the developed model, four types of wireless energy transfer systems are fabricated, measured, and compared with simulation results. To model a system composed of n-coils, node equations are built in the form of an n-by-n matrix, and the equivalent circuit model is established using an electric design automation tool. Using the model, we can simulate systems with multiple coils, power sources, and loads. Moreover, coupling constants are extracted as a function of the distance between two coils, and we can predict the characteristics of a system having coils at an arbitrary location. We fabricate four types of systems with relay coils, two operating frequencies, two power sources, and the function of characteristic impedance conversion. We measure the characteristics of all systems and compare them with the simulation results. The flexibility of the developed model enables us to design and optimize a complicated system consisting of many coils. © 2012 ETRI.
KSP Keywords
Complicated system, Coupled magnetic resonances, Coupling constant, Electric Design, Energy transfer system, Equivalent Circuit model, Impedance conversion, Magnetic resonance(MR), Multiple coils, Relay coils, Wireless energy transfer(WET)