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A 3D wireless charging cube with externally enhanced magnetic field for extended range of wireless power transfer

Published online by Cambridge University Press:  03 April 2019

Qi Zhu Open the ORCID record for Qi Zhu [Opens in a new window] ,
Hua Han ,
Mei Su  and
Aiguo Patrick Hu
Qi Zhu*
Affiliation:
School of Automation, Central South University, Changsha, China Hunan Provincial Key Laboratory of Power Electronics Equipment and Grid, Changsha, China
Hua Han
Affiliation:
School of Automation, Central South University, Changsha, China Hunan Provincial Key Laboratory of Power Electronics Equipment and Grid, Changsha, China
Mei Su
Affiliation:
School of Automation, Central South University, Changsha, China Hunan Provincial Key Laboratory of Power Electronics Equipment and Grid, Changsha, China
Aiguo Patrick Hu
Affiliation:
Department of Electrical and Computer Engineering, the University of Auckland, Auckland, New Zealand
*
Corresponding author: Qi Zhu Email: csu_zhuqi@163.com
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Abstract

More mobile devices such as mobile phones and robots are wirelessly charged for convenience, simplicity, and safety, and it would be desirable to achieve three-dimensional (3D) wireless charging with high spatial freedom and long range. This paper proposes a 3D wireless charging cube with three orthogonal coils and supporting magnetic cores to enhance the magnetic flux outside the cube. The proposed system is simulated by Ansoft Maxwell and implemented by a downsized prototype. Both simulation and experimental results show that the magnetic cores can strengthen the magnitude of B-field outside the cube. The final prototype demonstrates that the power transfer distance outside the cube for getting the same induced electromotive force in the receiver coil is extended approximately by 50 mm using magnetic cores with a permeability of 2800. It is found that the magnitude of B-field outside the cube can be increased by increasing the width and the permeability of the magnetic cores. The measured results show that when the permeability of the magnetic cores is fixed, the induced electromotive force in the receiver coil at a point 300 mm away from the center of the cube is increased by about 2V when the width of the magnetic cores is increased from 50 to 100 mm. The increase in the induced electromotive force at an extended point implies a greater potential of wireless power transfer capability to the power pickup.

Keywords

3D wireless charging cubeInductive power transferSupporting magnetic coresThree orthogonal coils
Type
Research Article
Information
Wireless Power Transfer , Volume 6 , Issue 1 , March 2019 , pp. 67 - 76
Copyright
Copyright © Cambridge University Press 2019 

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