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http://dx.doi.org/10.5515/JKIEES.2016.16.2.126

Analysis of Efficiencies for Multiple-Input Multiple-Output Wireless Power Transfer Systems  

Kim, Sejin (Department of Electronic and Radio Engineering, Kyung Hee University)
Lee, Bomson (Department of Electronic and Radio Engineering, Kyung Hee University)
Publication Information
Journal of electromagnetic engineering and science / v.16, no.2, 2016 , pp. 126-133 More about this Journal
Abstract
Wireless power transfer (WPT) efficiencies for multiple-input multiple-output (MIMO) systems are formulated with a goal of achieving their maximums using Z matrices. The maximum efficiencies for any arbitrarily given configurations are obtained using optimum loads, which can be determined numerically through adequate optimization procedures in general. For some simpler special cases (single-input single-output, single-input multiple-output, and multiple-input single-output) of the MIMO systems, the efficiencies and optimum loads to maximize them can be obtained using closed-form expressions. These closed-form solutions give us more physical insight into the given WPT problem. These efficiencies are evaluated theoretically based on the presented formulation and also verified with comparisons with circuit- and EM-simulation results. They are shown to lead to a good agreement. This work may be useful for construction of the wireless Internet of Things, especially employed with energy autonomy.
Keywords
Coupling Coefficient; Optimum Load Resistance; Transfer Efficiency; Wireless Power Transfer; Z Matrix;
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Times Cited By KSCI : 2  (Citation Analysis)
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