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Wireless power transfer between one transmitter and two receivers: optimal analytical solution

Published online by Cambridge University Press:  06 April 2016

Giuseppina Monti ,
Wenquan Che ,
Qinghua Wang ,
Marco Dionigi ,
Mauro Mongiardo ,
Renzo Perfetti  and
Yumei Chang
Giuseppina Monti*
Affiliation:
Department of Engineering for Innovation, University of Salento, Lecce, Italy. Phone: +39 0832 29 7365
Wenquan Che
Affiliation:
Department of Communication Engineering, Nanjing University of Science and Technology, 210094 Nanjing, China
Qinghua Wang
Affiliation:
Department of Communication Engineering, Nanjing University of Science and Technology, 210094 Nanjing, China
Marco Dionigi
Affiliation:
Department of Engineering, University of Perugia, Perugia, Italy
Mauro Mongiardo
Affiliation:
Department of Engineering, University of Perugia, Perugia, Italy
Renzo Perfetti
Affiliation:
Department of Engineering, University of Perugia, Perugia, Italy
Yumei Chang
Affiliation:
College of Electronic Science and Engineering, Nanjing University of Posts and Telecommunications, 210023 Nanjing, China
*
Corresponding author: G. Monti Email: giuseppina.monti@unisalento.it
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Abstract

This paper focuses on non-radiative wireless power transfer implemented by means of a resonant magnetic coupling. The case of one transmitter and two receivers is considered and a rigorous analytical procedure is developed demonstrating that maximum power transfer or maximum efficiency can be achieved by appropriately selecting the load values. Both cases of coupled and uncoupled receivers are solved; closed formulas are derived for the optimal loads, which maximize either power or efficiency. It is shown that the resistances that realize maximum power transfer are always greater than the resistances that realize maximum efficiency. According to this observation, an optimal range of operation for the load resistances is also determined. Furthermore, it is demonstrated that in the case where the receivers are coupled the introduction of appropriate compensating reactances allows retrieving the same results corresponding to the uncoupled case both for powers and efficiency. Theoretical data are validated by comparisons with numerical results.

Keywords

Wireless power transmissionMagnetic couplingTwo receiversPower maximizationEfficiency maximization
Type
Research Article
Information
Wireless Power Transfer , Volume 3 , Issue 1 , March 2016 , pp. 63 - 73
Copyright
Copyright © Cambridge University Press 2016 

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References

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