A Compact Spatial Free-Positioning Wireless Charging System for Consumer Electronics Using a Three-Dimensional Transmitting Coil

Ziwei Liang, Jianqiang Wang, Yiming Zhang, Jiuchun Jiang, Zhengchao Yan and Chris Mi
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Ziwei Liang: National Active Distribution Network Technology Research Center, School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
Jianqiang Wang: National Active Distribution Network Technology Research Center, School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
Yiming Zhang: Department of Electrical & Computer Engineering, San Diego State University, San Diego, CA 92182, USA
Jiuchun Jiang: Shenzhen Precise Testing Technology Co., Ltd, Shenzhen 518000, China
Zhengchao Yan: Department of Electrical & Computer Engineering, San Diego State University, San Diego, CA 92182, USA
Chris Mi: Department of Electrical & Computer Engineering, San Diego State University, San Diego, CA 92182, USA

Energies, 2019, vol. 12, issue 8, 1-10

Abstract: A compact spatial free-positioning wireless charging system with a novel three-dimensional (3D) transmitting (Tx) coil is proposed to charge consumer electronics in the working area. Because of the strengthened electromagnetic field generated by the proposed 3D Tx coil in the space, this system can charge consumer electronics wirelessly with great tolerance to positional and angular misalignments between the transmitter and receiver. Benefiting from the compact design of the 3D Tx coil, the system can be easily embedded in some corners of office furniture/cubic panels, which will not cause any extra working space consumption when charging devices. The inductor-capacitor-capacitor (LCC) compensation circuit on the Tx side can achieve constant current output, which is independent of load condition and can protect the transmitter. With the LCC compensation circuit, the MOSFETs of the H-bridge high-frequency inverter realized zero voltage switching (ZVS). The small-sized planar receiving (Rx) coil and series (S) compensation circuit is applied to achieve compact receiver design. The theoretical and experimental results show that the spatial free-positioning wireless charging prototype can transfer 5 W to the small-sized receiver in around 350 mm × 225 mm × 200 mm 3D charging area and achieve the highest efficiency of 77.9%.

Keywords: compact embedded design; spatial free-positioning wireless charging system; three-dimensional (3D) transmitting (Tx) coil; inductor–capacitor–capacitor and series (LCC-S) (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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