Efficiency improvement of wireless power transfer via magnetic resonance using transmission coil array

Author

Oodachi, Noriaki ; Ogawa, Kenichiro ; Kudo, Hiroki ; Shoki, Hiroki ; Obayashi, Shuichi ; Morooka, Tasuku

Author_Institution

Corp. R&D Center, Toshiba Corp., Kawasaki, Japan

fYear

2011

fDate

3-8 July 2011

Firstpage

1707

Lastpage

1710

Abstract

The transfer efficiency between a transmission coil and a reception coil for wireless power transfer via magnetic resonance is a function of the orientation between the coils. When two coils share a single axis, the transfer efficiency is maximal, but otherwise the efficiency becomes lower. In this paper, a wireless power transfer system via magnetic resonance using a transmission coil array is proposed to improve the transfer efficiency. The transmission coils of the array are excited with appropriate phase weights by transmission circuit, according to the orientation among the transmission coils and the receiving coil. The effect of the proposed system is confirmed by simulation by a method of moment and measurement using a vector network analyzer.

Keywords

antenna arrays; coils; magnetic resonance; network analysers; magnetic resonance; transmission circuit; transmission coil array; vector network analyzer; wireless power transfer system; Arrays; Coils; Couplings; Integrated circuit modeling; Magnetic resonance; Power dividers; Wireless communication; coil array; magnetic resonance; transfer efficiency; wireless power transfer;

fLanguage

English

Publisher

ieee

Conference_Titel

Antennas and Propagation (APSURSI), 2011 IEEE International Symposium on

Conference_Location

Spokane, WA

ISSN

1522-3965

Print_ISBN

978-1-4244-9562-7

Type

conf

DOI

10.1109/APS.2011.5996636

Filename

5996636