Three-Coil Wireless Charging System for Metal-Cover Smartphone Applications

Jia Qi Zhu; Yong Ling Ban; Yiming Zhang; Zhengchao Yan; Rui Min Xu; Chunting Chris Mi

doi:10.1109/TPEL.2019.2944845

Three-Coil Wireless Charging System for Metal-Cover Smartphone Applications

Jia Qi Zhu
, Yong Ling Ban
, Yiming Zhang
, Zhengchao Yan
, Rui Min Xu
, Chunting Chris Mi

School of Marine Science and Technology

University of Electronic Science and Technology of China
San Diego State University

Research output: Contribution to journal › Article › peer-review

58 Scopus citations

Abstract

A three-coil wireless charging system is proposed for full metal-cover smartphone applications. Considering the space limitation and other antennas in the smartphone, the receiver coil embedded in the smartphone is designed to be miniaturized as 16 mm × 65 mm. By integrating a series capacitance at the end of the 2-mm width narrow horizontal slot loading on the metal cover, the metal cover is converted to a relay coil of the three-coil system and wireless power transfer (WPT) through the metal cover is thus achieved. A prototype of the proposed three-coil system has been built and WPT through metal cover has been validated via experiment. The experimental results show that the prototype achieves 5 W output power with 71% coil-to-coil efficiency.

Original language	English
Article number	8854160
Pages (from-to)	4847-4858
Number of pages	12
Journal	IEEE Transactions on Power Electronics
Volume	35
Issue number	5
DOIs	https://doi.org/10.1109/TPEL.2019.2944845
State	Published - May 2020

Keywords

2-mm slot
full metal-cover
miniaturized receiver coil
smartphone application
three-coil system
wireless power transfer

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10.1109/TPEL.2019.2944845

Cite this

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title = "Three-Coil Wireless Charging System for Metal-Cover Smartphone Applications",

abstract = "A three-coil wireless charging system is proposed for full metal-cover smartphone applications. Considering the space limitation and other antennas in the smartphone, the receiver coil embedded in the smartphone is designed to be miniaturized as 16 mm × 65 mm. By integrating a series capacitance at the end of the 2-mm width narrow horizontal slot loading on the metal cover, the metal cover is converted to a relay coil of the three-coil system and wireless power transfer (WPT) through the metal cover is thus achieved. A prototype of the proposed three-coil system has been built and WPT through metal cover has been validated via experiment. The experimental results show that the prototype achieves 5 W output power with 71\% coil-to-coil efficiency.",

keywords = "2-mm slot, full metal-cover, miniaturized receiver coil, smartphone application, three-coil system, wireless power transfer",

author = "Zhu, \{Jia Qi\} and Ban, \{Yong Ling\} and Yiming Zhang and Zhengchao Yan and Xu, \{Rui Min\} and Mi, \{Chunting Chris\}",

note = "Publisher Copyright: {\textcopyright} 1986-2012 IEEE.",

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AU - Zhang, Yiming

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AU - Mi, Chunting Chris

PY - 2020/5

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AB - A three-coil wireless charging system is proposed for full metal-cover smartphone applications. Considering the space limitation and other antennas in the smartphone, the receiver coil embedded in the smartphone is designed to be miniaturized as 16 mm × 65 mm. By integrating a series capacitance at the end of the 2-mm width narrow horizontal slot loading on the metal cover, the metal cover is converted to a relay coil of the three-coil system and wireless power transfer (WPT) through the metal cover is thus achieved. A prototype of the proposed three-coil system has been built and WPT through metal cover has been validated via experiment. The experimental results show that the prototype achieves 5 W output power with 71% coil-to-coil efficiency.

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Three-Coil Wireless Charging System for Metal-Cover Smartphone Applications

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Keywords

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