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

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

47 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",

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AU - Mi, Chunting Chris

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

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