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Criticality mitigation in a quasi-constant coupling position independent resonant IPT network

Published online by Cambridge University Press:  08 June 2018

Alex Pacini Open the ORCID record for Alex Pacini [Opens in a new window] ,
Franco Mastri ,
Diego Masotti  and
Alessandra Costanzo
Alex Pacini*
Affiliation:
Department of Electrical, Electronic and Information Engineering ‘Guglielmo Marconi’ (DEI) of the University of Bologna, Bologna, Italy
Franco Mastri
Affiliation:
Department of Electrical, Electronic and Information Engineering ‘Guglielmo Marconi’ (DEI) of the University of Bologna, Bologna, Italy
Diego Masotti
Affiliation:
Department of Electrical, Electronic and Information Engineering ‘Guglielmo Marconi’ (DEI) of the University of Bologna, Bologna, Italy
Alessandra Costanzo
Affiliation:
Department of Electrical, Electronic and Information Engineering ‘Guglielmo Marconi’ (DEI) of the University of Bologna, Bologna, Italy
*
Author for correspondence: Alex Pacini, E-mail: [email protected]
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Abstract

This paper discusses some significant design issues that are faced in resonant inductive system for wireless power transfer ‘on the move’. The targeted system adopts a single AC source to power a sequence of transmitting (Tx) coils, placed along the Rx path, whose geometry is optimized to minimize the variations of coupling for every possible Rx position. To retain a constant coupling coefficient, two nearby Tx coils are series-connected and simultaneously activated, establishing a path without any theoretical bound on its length, by a suitable switching network. This work analyzes the effects of asynchronous switching times, which are rigorously accounted for and minimized by a proper design of the compensating circuit elements, minimizing both the voltage spikes and the over currents on the coils, while keeping the system at resonance. A prototype operating at 6.78 MHz is built and experimental validations are carried out to verify the feasibility of a constant coupling link without experiencing the mentioned effects, but the adopted procedure is general and independent on its size or frequency.

Keywords

passive components and circuitswireless power transfer and energyharvesting
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 10 , Issue 8 , October 2018 , pp. 911 - 920
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2018 

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