A methodology for making a three-coil wireless power transfer system more energy efficient than a two-coil counterpart for extended transfer distance

W. X. Zhong; C. Zhang; Xun Liu; S. Y. Ron Hui

doi:10.1109/TPEL.2014.2312020

A methodology for making a three-coil wireless power transfer system more energy efficient than a two-coil counterpart for extended transfer distance

W. X. Zhong
, C. Zhang
, Xun Liu
, S. Y. Ron Hui

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

241 Citations (Scopus)

Abstract

A new methodology for ensuring that a three-coil wireless power transfer system is more energy efficient than a two-coil counterpart is presented in this paper. The theoretical proof and the conditions for meeting the objective are derived and practically verified in a practical prototype. The key features of the magnetic design are to: 1) shift the current stress from the primary driving circuit to the relay resonator; and 2) generate a large relay current for maximizing magnetic coupling with the receiver coil for efficient power transfer. Consequently, the current rating and cost of the driving circuit can be reduced and the overall quality factor and system energy efficiency are improved. This approach utilizes the combined advantages of the maximum efficiency principle and the use of relay resonator to overcome the energy efficiency problem for applications with extended energy transfer distances. © 2014 IEEE.

Original language	English
Article number	2312020
Pages (from-to)	933-942
Journal	IEEE Transactions on Power Electronics
Volume	30
Issue number	2
DOIs	https://doi.org/10.1109/TPEL.2014.2312020
Publication status	Published - 1 Feb 2015
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 GRF Project: HKU 712913.

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 7 Affordable and Clean Energy

Research Keywords

Contactless power
Inductive power transfer
Planar wireless charging technology
Wireless power transfer (WPT)

RGC Funding Information

RGC-funded

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10.1109/TPEL.2014.2312020

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abstract = "A new methodology for ensuring that a three-coil wireless power transfer system is more energy efficient than a two-coil counterpart is presented in this paper. The theoretical proof and the conditions for meeting the objective are derived and practically verified in a practical prototype. The key features of the magnetic design are to: 1) shift the current stress from the primary driving circuit to the relay resonator; and 2) generate a large relay current for maximizing magnetic coupling with the receiver coil for efficient power transfer. Consequently, the current rating and cost of the driving circuit can be reduced and the overall quality factor and system energy efficiency are improved. This approach utilizes the combined advantages of the maximum efficiency principle and the use of relay resonator to overcome the energy efficiency problem for applications with extended energy transfer distances. {\textcopyright} 2014 IEEE.",

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A methodology for making a three-coil wireless power transfer system more energy efficient than a two-coil counterpart for extended transfer distance. / Zhong, W. X.; Zhang, C.; Liu, Xun et al.
In: IEEE Transactions on Power Electronics, Vol. 30, No. 2, 2312020, 01.02.2015, p. 933-942.

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

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AU - Liu, Xun

AU - Hui, S. Y. Ron

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AB - A new methodology for ensuring that a three-coil wireless power transfer system is more energy efficient than a two-coil counterpart is presented in this paper. The theoretical proof and the conditions for meeting the objective are derived and practically verified in a practical prototype. The key features of the magnetic design are to: 1) shift the current stress from the primary driving circuit to the relay resonator; and 2) generate a large relay current for maximizing magnetic coupling with the receiver coil for efficient power transfer. Consequently, the current rating and cost of the driving circuit can be reduced and the overall quality factor and system energy efficiency are improved. This approach utilizes the combined advantages of the maximum efficiency principle and the use of relay resonator to overcome the energy efficiency problem for applications with extended energy transfer distances. © 2014 IEEE.

KW - Contactless power

KW - Inductive power transfer

KW - Planar wireless charging technology

KW - Wireless power transfer (WPT)

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A methodology for making a three-coil wireless power transfer system more energy efficient than a two-coil counterpart for extended transfer distance

Abstract

Bibliographical note

Funding

UN SDGs

Research Keywords

RGC Funding Information

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