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Journal Article
Method for Adjusting Single Matching Network for High-Power Transfer Efficiency of Wireless Power Transfer System
- Authors
- Dong-Wook Seo, Jae-Ho Lee, Hyungsoo Lee
- Issue Date
- 2016-10
- Citation
- ETRI Journal, v.38, no.5, pp.962-971
- ISSN
- 1225-6463
- Publisher
- 한국전자통신연구원 (ETRI)
- Language
- English
- Type
- Journal Article
- 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.
- KSP Keywords
- Coupling Coefficient, High power, Highly efficient, Load impedance, Maximum Power Transfer(MPT), Optimum condition, Power Transfer Efficiency, Source impedance, Transducer power gain, Two-port Network, Wireless Power Transfer (WPT) system