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http://dx.doi.org/10.6109/jkiice.2017.21.5.1035

Comparison of Achievable Efficiency for Different Resonator Structures in a Magnetic Resonance-based Wireless Power Transfer System  

Lee, Kisong (School of Computer, Information and Communication Engineering, Kunsan National University)
Yang, Haekwon (School of Computer, Information and Communication Engineering, Kunsan National University)
Ra, In-Ho (School of Computer, Information and Communication Engineering, Kunsan National University)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.21, no.5, 2017 , pp. 1035-1041 More about this Journal
Abstract
In magnetic resonance-based wireless power transfer (WPT) systems, frequency splitting phenomenon, in which power transfer efficiency (PTE) decreases seriously as resonators are close to each other, is the problem that we should address for reliable power transfer in short distance. In this paper, we present WPT systems using an equivalent circuit model and analyze PTE and marginal coupling coefficient ($k_{split}$) where the frequency splitting occurs. In addition, we perform circuit-level simulations using Advanced Design System, and show that the achievable PTE is different for the structures of resonators when k>$k_{split}$. We confirm that higher PTE can be ensured as k increases in the case of identical resonators, while PTE is degraded as k increases in the case of non-identical resonators. Therefore, in short distance, in which k>$k_{split}$, it is more efficient for achieving reliable PTE to use identical resonators rather than non-identical resonators.
Keywords
Wireless Power Transfer; Magnetic Resonance; Power Transfer Efficiency; Frequency Splitting;
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