Basic Control Principles of Omnidirectional Wireless Power Transfer

Cheng Zhang; Deyan Lin; S. Y. Hui

doi:10.1109/TPEL.2015.2479246

Basic Control Principles of Omnidirectional Wireless Power Transfer

Cheng Zhang
, Deyan Lin
, S. Y. Hui

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

139 Citations (Scopus)

Abstract

This paper presents the basic control principles of omnidirectional wireless power transfer (WPT) based on the current amplitude control. The principles involve 1) an 'omnidirectional' scanning process for detecting the power requirements in a 3-D space and 2) a 'directional' power flow control for focusing the wireless power toward the targeted areas. Such principles apply to any WPT system comprising three orthogonal transmitter coils and multiple receivers with coil resonators. A current amplitude control method capable of generating a magnetic vector at a set of points evenly distributed on a spherical surface is explained. Based on the voltage and the current information in the transmitter circuit, the power involved in each vector over the spherical surface can be obtained. By scanning the vector over the spherical surface, the collective power flow requirements for the targeted loads can be determined. Based on the power requirements for the vectors over the spherical surface, a weighted time-sharing scheme is adopted to focus the wireless power toward the targeted areas. This method has been successfully applied to a hardware prototype. Both theoretical and experimental results are included to confirm these principles. © 1986-2012 IEEE.

Original language	English
Article number	7270317
Pages (from-to)	5215-5227
Journal	IEEE Transactions on Power Electronics
Volume	31
Issue number	7
DOIs	https://doi.org/10.1109/TPEL.2015.2479246
Publication status	Published - 1 Jul 2016
Externally published	Yes

Bibliographical note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

Funding

This work was supported by the Hong Kong Research Grant Council under the Project HKU 17206715, and also by the Philip Wong and Wilson Wong Endowment Fund for the patent application [16].

Research Keywords

Contactless power
Omnidirectional power
Wireless power transfer

RGC Funding Information

RGC-funded

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title = "Basic Control Principles of Omnidirectional Wireless Power Transfer",

abstract = "This paper presents the basic control principles of omnidirectional wireless power transfer (WPT) based on the current amplitude control. The principles involve 1) an 'omnidirectional' scanning process for detecting the power requirements in a 3-D space and 2) a 'directional' power flow control for focusing the wireless power toward the targeted areas. Such principles apply to any WPT system comprising three orthogonal transmitter coils and multiple receivers with coil resonators. A current amplitude control method capable of generating a magnetic vector at a set of points evenly distributed on a spherical surface is explained. Based on the voltage and the current information in the transmitter circuit, the power involved in each vector over the spherical surface can be obtained. By scanning the vector over the spherical surface, the collective power flow requirements for the targeted loads can be determined. Based on the power requirements for the vectors over the spherical surface, a weighted time-sharing scheme is adopted to focus the wireless power toward the targeted areas. This method has been successfully applied to a hardware prototype. Both theoretical and experimental results are included to confirm these principles. {\textcopyright} 1986-2012 IEEE.",

keywords = "Contactless power, Omnidirectional power, Wireless power transfer",

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AU - Hui, S. Y.

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N2 - This paper presents the basic control principles of omnidirectional wireless power transfer (WPT) based on the current amplitude control. The principles involve 1) an 'omnidirectional' scanning process for detecting the power requirements in a 3-D space and 2) a 'directional' power flow control for focusing the wireless power toward the targeted areas. Such principles apply to any WPT system comprising three orthogonal transmitter coils and multiple receivers with coil resonators. A current amplitude control method capable of generating a magnetic vector at a set of points evenly distributed on a spherical surface is explained. Based on the voltage and the current information in the transmitter circuit, the power involved in each vector over the spherical surface can be obtained. By scanning the vector over the spherical surface, the collective power flow requirements for the targeted loads can be determined. Based on the power requirements for the vectors over the spherical surface, a weighted time-sharing scheme is adopted to focus the wireless power toward the targeted areas. This method has been successfully applied to a hardware prototype. Both theoretical and experimental results are included to confirm these principles. © 1986-2012 IEEE.

AB - This paper presents the basic control principles of omnidirectional wireless power transfer (WPT) based on the current amplitude control. The principles involve 1) an 'omnidirectional' scanning process for detecting the power requirements in a 3-D space and 2) a 'directional' power flow control for focusing the wireless power toward the targeted areas. Such principles apply to any WPT system comprising three orthogonal transmitter coils and multiple receivers with coil resonators. A current amplitude control method capable of generating a magnetic vector at a set of points evenly distributed on a spherical surface is explained. Based on the voltage and the current information in the transmitter circuit, the power involved in each vector over the spherical surface can be obtained. By scanning the vector over the spherical surface, the collective power flow requirements for the targeted loads can be determined. Based on the power requirements for the vectors over the spherical surface, a weighted time-sharing scheme is adopted to focus the wireless power toward the targeted areas. This method has been successfully applied to a hardware prototype. Both theoretical and experimental results are included to confirm these principles. © 1986-2012 IEEE.

KW - Contactless power

KW - Omnidirectional power

KW - Wireless power transfer

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JF - IEEE Transactions on Power Electronics

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Basic Control Principles of Omnidirectional Wireless Power Transfer

Abstract

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Research Keywords

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