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Design of magnetic-resonant wireless power transfer links realized with two coils: comparison of solutions

Published online by Cambridge University Press:  23 April 2015

Alessandra Costanzo ,
Marco Dionigi ,
Franco Mastri ,
Mauro Mongiardo ,
Johannes A. Russer  and
Peter Russer
Alessandra Costanzo*
Affiliation:
Università di Bologna, Bologna, Italy. Phone: +39 051 209 3059
Marco Dionigi
Affiliation:
Università di Perugia, Perugia, Italy
Franco Mastri
Affiliation:
Università di Bologna, Bologna, Italy. Phone: +39 051 209 3059
Mauro Mongiardo
Affiliation:
Università di Perugia, Perugia, Italy
Johannes A. Russer
Affiliation:
Institute for Nanoelectronics, Technische Universität München, Munich, Germany
Peter Russer
Affiliation:
Institute for Nanoelectronics, Technische Universität München, Munich, Germany
*
Corresponding author: A. Costanzo Email: alessandra.costanzo@unibo.it
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Abstract

A novel approach for the rigorous design of magnetic resonant wireless power transfer links is introduced. We show how, starting from two coupled inductors and making use of general network theory, it is possible to derive analytic rules for designing the source and load terminations which provide the maximum power transfer efficiency or maximize the received power. We also show that, by adding suitable matching networks to two coupled inductors we can realize a wireless link acting as a 1:n transformer and having the all required tunable reactive elements on the primary side. The proposed topology greatly simplifies the design, since only an inductive coil and a fixed capacitance are required on the secondary side; in addition, when tuning is required due to coils misalignment or to link distance variation, it can be attained by acting on the transmitter side without the need for a feedback communication through the link. Moreover, when the load resistance is designed for maximum output power, its value is fixed and does not depend on the coupling. A numerical and experimental verification of the proposed approach is also presented.

Keywords

Wireless power transferCoupled resonatorsInductive couplingConjugate matching
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 7 , Special Issue 3-4: European Microwave Week 2014 , June 2015 , pp. 349 - 359
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2015 

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References

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