An Inductive Power Transfer System With a High-Q Resonant Tank for Mobile Device Charging

Author

Qifan Li ; Liang, Yung C.

Author_Institution

Dept. of Electr. & Comput. Eng., Nat. Univ. of Singapore, Singapore, Singapore

Volume

30

Issue

11

fYear

2015

Firstpage

6203

Lastpage

6212

Abstract

Inductive power transfer (IPT), which employs the principle of electromagnetic induction, is widely applied to wireless charging applications. The efficiency of an IPT system is highly dependent on the quality factor (Q) of the power resonant tank. In this paper, a novel design on the structure of the resonant coil is used in the resonant tank to achieve a significantly high Q above 1000 for the IPT system. Compensating capacitors are used in both primary and secondary circuits to align the resonant frequencies in order for the system resonant status to be maintained by a frequency tracking circuit. The experimental results show that with a primary coil Q of 1200, the proposed IPT system allows power to be transferred at a maximum air gap distance to coil diameter ratio of 1.46 for a highest efficiency of 87% at the resonant frequency of 106 kHz.

Keywords

Q-factor; capacitors; coils; inductive power transmission; IPT; compensating capacitors; efficiency 87 percent; electromagnetic induction; frequency 106 kHz; frequency tracking circuit; inductive power transfer; mobile device charging; power resonant tank; primary circuits; quality factor; resonant coil; resonant frequencies; secondary circuits; system resonant status; wireless charging applications; Capacitors; Conductors; Mobile handsets; RLC circuits; Resonant frequency; Windings; Inductive power transfer (IPT); Inductive power transfer,; quality factor; quality factor (Q); resonant frequency tracking; wireless charging;

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/TPEL.2015.2424678

Filename

7101277