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http://dx.doi.org/10.4218/etrij.16.2615.0012

Method for Adjusting Single Matching Network for High-Power Transfer Efficiency of Wireless Power Transfer System  

Seo, Dong-Wook (Daegu-Gyeongbuk Research Center, ETRI)
Lee, Jae-Ho (Daegu-Gyeongbuk Research Center, ETRI)
Lee, Hyungsoo (Daegu-Gyeongbuk Research Center, ETRI)
Publication Information
ETRI Journal / v.38, no.5, 2016 , pp. 962-971 More about this Journal
Abstract
A wireless power transfer (WPT) system is generally designed with the optimum source and load impedance in order to achieve the maximum power transfer efficiency (PTE) at a specific coupling coefficient. Empirically or intuitively, however, it is well known that a high PTE can be attained by adjusting either the source or load impedance. In this paper, we estimate the maximum achievable PTE of WPT systems with the given load impedance, and propose the condition of source impedance for the maximum PTE. This condition can be reciprocally applied to the load impedance of a WPT system with the given source impedance. First, we review the transducer power gain of a two-port network as the PTE of the WPT system. Next, we derive two candidate conditions, the critical coupling and the optimum conditions, from the transducer power gain. Finally, we compare the two conditions carefully, and the results therefore indicate that the optimum condition is more suitable for a highly efficient WPT system with a given load impedance.
Keywords
Matching network; Power gain; Power transfer efficiency; Transducer power gain; Two-coil WPT system; Two-port network; Z-parameter;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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