Conditions for a Load-Independent Operating Regime in Resonant Inductive WPT

Alessandra Costanzo; Marco Dionigi; Franco Mastri; Mauro Mongiardo; Giuseppina Monti; Johannes A. Russer; Peter Russer; Luciano Tarricone

doi:10.1109/TMTT.2017.2669987

Conditions for a Load-Independent Operating Regime in Resonant Inductive WPT

Alessandra Costanzo, Marco Dionigi, Franco Mastri, Mauro Mongiardo, Giuseppina Monti, Johannes A. Russer, Peter Russer, Luciano Tarricone

Technical University of Munich

Research output: Contribution to journal › Article › peer-review

47 Scopus citations

Abstract

This paper provides a rigorous theoretical formulation to obtain an inductive resonant wireless power transfer (WPT) link with load-independent output voltage or current. This is a crucial working condition for wireless battery recharging, where there is no deterministic knowledge of load variation with respect to the battery charging level. The ideal lossless and the realistic lossy configurations are considered for both voltage- and current-excited WPT links. The link transfer matrix (ABCD matrix) is used to determine the operating frequencies where a load-independent output voltage or current can be obtained. It is shown that in the lossy cases that an almost load-independent behavior can be achieved, provided that the load resistance lies in a suitable range and analytical conditions on the load resistance value have been derived. The analytical relationships obtained by this theory are validated by means of both circuit simulation and experimental data at 13.56 MHz.

Original language	English
Article number	7865948
Pages (from-to)	1066-1076
Number of pages	11
Journal	IEEE Transactions on Microwave Theory and Techniques
Volume	65
Issue number	4
DOIs	https://doi.org/10.1109/TMTT.2017.2669987
State	Published - Apr 2017

Keywords

Load independent
magnetic coupling
resonators
wireless power transmission

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10.1109/TMTT.2017.2669987

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abstract = "This paper provides a rigorous theoretical formulation to obtain an inductive resonant wireless power transfer (WPT) link with load-independent output voltage or current. This is a crucial working condition for wireless battery recharging, where there is no deterministic knowledge of load variation with respect to the battery charging level. The ideal lossless and the realistic lossy configurations are considered for both voltage- and current-excited WPT links. The link transfer matrix (ABCD matrix) is used to determine the operating frequencies where a load-independent output voltage or current can be obtained. It is shown that in the lossy cases that an almost load-independent behavior can be achieved, provided that the load resistance lies in a suitable range and analytical conditions on the load resistance value have been derived. The analytical relationships obtained by this theory are validated by means of both circuit simulation and experimental data at 13.56 MHz.",

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AU - Mastri, Franco

AU - Mongiardo, Mauro

AU - Monti, Giuseppina

AU - Russer, Johannes A.

AU - Russer, Peter

AU - Tarricone, Luciano

PY - 2017/4

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Conditions for a Load-Independent Operating Regime in Resonant Inductive WPT

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Keywords

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