Analysis on numbers and adaptive ranges of resonators for efficient resonant coupling wireless power transmission

Author

Ching-Wen Yang ; Chin-Lung Yang

Author_Institution

Dept. of Electr. Eng., Nat. Cheng Kung Univ., Tainan, Taiwan

fYear

2014

fDate

8-9 May 2014

Firstpage

255

Lastpage

258

Abstract

Resonant coupling is the technology widely applied for efficient wireless power transfer in medium ranges. This paper applies reflected load theory to analyze the multi-coil system consisting of several resonators. Different number of resonators would change resistance reflected to primary side and influence power delivered to load. To optimize power transmission of system, this paper purposes a method to calculate critical coupling point. A practical 4-coil system was implemented for verification. Based on this method, optimal 71.10 % of efficiency can be obtained by adjusting coupling between coils. Further, shifting frequency of source could enhance efficiency over 40 % when the distance d₂₃ is less than 2 cm.

Keywords

inductive power transmission; resonators; medium ranges; multicoil system; reflected load theory; resonant coupling wireless power transmission; resonators adaptive ranges; wireless power transfer; Coils; Couplings; Electrical resistance measurement; Power transmission; Resistance; Resonant frequency; Wireless communication; critical coupling; number of resonators; resonant coupling; wireless power transmission;

fLanguage

English

Publisher

ieee

Conference_Titel

Wireless Power Transfer Conference (WPTC), 2014 IEEE

Conference_Location

Jeju

Type

conf

DOI

10.1109/WPT.2014.6839557

Filename

6839557