Open AccessWireless power transfer between one transmitter and two receivers: optimal analytical solution
Author(s) -
Giuseppina Monti,
Wenquan Che,
Qinghua Wang,
Marco Dionigi,
Mauro Mongiardo,
R. Perfetti,
Yumei Chang
Publication year - 2016
Publication title -
wireless power transfer
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.275
H-Index - 11
ISSN - 2052-8418
DOI - 10.1017/wpt.2016.3
Subject(s) - wireless power transfer , transmitter , maximum power transfer theorem , power (physics) , maximum power principle , coupling (piping) , wireless , transfer efficiency , range (aeronautics) , inductive coupling , computer science , transmitter power output , electronic engineering , transfer (computing) , control theory (sociology) , electrical engineering , channel (broadcasting) , engineering , telecommunications , physics , mechanical engineering , control (management) , quantum mechanics , artificial intelligence , parallel computing , aerospace engineering
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.