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Numerical and experimental study of the effects of load and distance variation on wireless power transfer systems using magnetically coupled resonators

Numerical and experimental study of the effects of load and distance variation on wireless power transfer systems using magnetically coupled resonators
Numerical and experimental study of the effects of load and distance variation on wireless power transfer systems using magnetically coupled resonators
This work investigates a series resonant circuit designed to wirelessly transfer power to charge an electrical vehicle battery. A typical approach assumes the load connected to the power transfer system to be constant and then the wireless link efficiency is studied. In practical engineering applications, however, the load and the distance between coils will vary and the efficiency may strongly depend on these variations. The efficiency will also be affected by the presence of massive conducting or shielding structures in the proximity of the wireless system. Here, the authors study these effects with the help of an equivalent circuit extracted from a full wave simulation and correlated with measured results. The authors demonstrate that by changing the load resistance the efficiency of the system can be improved, even for a large separation between the two magnetically coupled resonators; however, the maximum efficiency point may not correspond to the maximum power that can be handled by the system. They then analyse the primary and secondary voltages and currents in support of the above findings.
battery powered vehicles, circuit resonance, magnetic shielding, radiofrequency power transmission, resonators, radio links, equivalent circuits
1751-8830
160-171
Rotaru, M.
c53c5038-2fed-4ace-8fad-9f95d4c95b7e
Tanzania, R.
66c087c6-9c27-4ccb-b07c-8d6cdde0cae3
Ayoob, R.
9520a234-f49a-45b9-ba23-c4d0e500da14
Kheng, T.Y.
0e034d49-da51-4e46-93eb-caec82fe89e1
Sykulski, J.K.
d6885caf-aaed-4d12-9ef3-46c4c3bbd7fb
Rotaru, M.
c53c5038-2fed-4ace-8fad-9f95d4c95b7e
Tanzania, R.
66c087c6-9c27-4ccb-b07c-8d6cdde0cae3
Ayoob, R.
9520a234-f49a-45b9-ba23-c4d0e500da14
Kheng, T.Y.
0e034d49-da51-4e46-93eb-caec82fe89e1
Sykulski, J.K.
d6885caf-aaed-4d12-9ef3-46c4c3bbd7fb

Rotaru, M., Tanzania, R., Ayoob, R., Kheng, T.Y. and Sykulski, J.K. (2015) Numerical and experimental study of the effects of load and distance variation on wireless power transfer systems using magnetically coupled resonators. IET Science, Measurement & Technology, 9 (2), 160-171. (doi:10.1049/iet-smt.2014.0175).

Record type: Article

Abstract

This work investigates a series resonant circuit designed to wirelessly transfer power to charge an electrical vehicle battery. A typical approach assumes the load connected to the power transfer system to be constant and then the wireless link efficiency is studied. In practical engineering applications, however, the load and the distance between coils will vary and the efficiency may strongly depend on these variations. The efficiency will also be affected by the presence of massive conducting or shielding structures in the proximity of the wireless system. Here, the authors study these effects with the help of an equivalent circuit extracted from a full wave simulation and correlated with measured results. The authors demonstrate that by changing the load resistance the efficiency of the system can be improved, even for a large separation between the two magnetically coupled resonators; however, the maximum efficiency point may not correspond to the maximum power that can be handled by the system. They then analyse the primary and secondary voltages and currents in support of the above findings.

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SMT-SI-2014-0175.pdf - Accepted Manuscript
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More information

Accepted/In Press date: 12 September 2014
Published date: 11 March 2015
Keywords: battery powered vehicles, circuit resonance, magnetic shielding, radiofrequency power transmission, resonators, radio links, equivalent circuits
Organisations: EEE

Identifiers

Local EPrints ID: 375071
URI: http://eprints.soton.ac.uk/id/eprint/375071
ISSN: 1751-8830
PURE UUID: 3273a69b-4195-478f-b0e2-b8c8a7059f03
ORCID for J.K. Sykulski: ORCID iD orcid.org/0000-0001-6392-126X

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Date deposited: 11 Mar 2015 10:02
Last modified: 07 Oct 2020 02:32

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