Free-positioning wireless charging system for hearing aids using a bowl-shaped transmitting coil

Author

Jinwook Kim ; Do-Hyeon Kim ; Kwan-Ho Kim ; Young-Jin Park

Author_Institution

Dept. of Power Electr. Equip. Inf. & Commun. Eng., Univ. of Sci. & Technol., Ansan, South Korea

fYear

2014

fDate

8-9 May 2014

Firstpage

60

Lastpage

63

Abstract

This paper proposes a wireless power transfer system for charging hearing aids. A bowl-shaped transmitting (Tx) coil is to achieve free-positioning of wireless charging. The proposed Tx coil consists of both spiral and conical-shaped helical loops in series. A receiving coil is wound on a rectangular box made of ferrite sheets to improve coupling coefficients. It is shown that the proposed system can uniformly recharge a Li-Ion battery of the hearing aid with 30% overall efficiency in the parallel arrangement. Furthermore, even in the perpendicular arrangement, the battery can be recharged except a narrow dead zone near the center of the Tx coil.

Keywords

coils; hearing aids; inductive power transmission; secondary cells; Li-Ion battery; Tx coil; bowl-shaped transmitting coil; conical-shaped helical loops; efficiency 30 percent; ferrite sheets; free-positioning; hearing aids; narrow dead zone; receiving coil; rectangular box; spiral helical loops; wireless power transfer system; Auditory system; Batteries; Coils; Hearing aids; Inductive charging; Magnetic fields; Spirals; Bowl-shaped coil; conical-shaped coil; free-positioning; hearing aids; spatial freedom; wireless charging;

fLanguage

English

Publisher

ieee

Conference_Titel

Wireless Power Transfer Conference (WPTC), 2014 IEEE

Conference_Location

Jeju

Type

conf

DOI

10.1109/WPT.2014.6839628

Filename

6839628