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Open AccessArticle

Analysis of Fundamental Differences between Capacitive and Inductive Impedance Matching for Inductive Wireless Power Transfer

Department of Microsystems, University of South-Eastern Norway, Campus Vestfold, NO-3184 Horten, Norway
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Electronics 2020, 9(3), 476; https://doi.org/10.3390/electronics9030476
Received: 21 February 2020 / Revised: 5 March 2020 / Accepted: 6 March 2020 / Published: 13 March 2020
(This article belongs to the Special Issue Wireless Power/Data Transfer, Energy Harvesting System Design)
Inductive and capacitive impedance matching are two different techniques optimizing power transfer in magnetic resonance inductive wireless power transfer. Under ideal conditions, i.e., unrestricted parameter ranges and no loss, both approaches can provide the perfect match. Comparing these two techniques under non-ideal conditions, to explore fundamental differences in their performance, is a challenging task as the two techniques are fundamentally different in operation. In this paper, we accomplish such a comparison by determining matchable impedances achievable by these networks and visualizing them as regions of a Smith chart. The analysis is performed over realistic constraints on parameters of three different application cases both with and without loss accounted for. While the analysis confirms that it is possible to achieve unit power transfer efficiency with both approaches in the lossless case, we find that the impedance regions where this is possible, as visualized in the Smith chart, differ between the two approaches and between the applications. Furthermore, an analysis of the lossy case shows that the degradation of the power transfer efficiencies upon introduction of parasitic losses is similar for the two methods. View Full-Text
Keywords: impedance matching network; parasitic resistance; power loss; reflection coefficient; Smith chart; wireless power transfer impedance matching network; parasitic resistance; power loss; reflection coefficient; Smith chart; wireless power transfer
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Zhaksylyk, Y.; Halvorsen, E.; Hanke, U.; Azadmehr, M. Analysis of Fundamental Differences between Capacitive and Inductive Impedance Matching for Inductive Wireless Power Transfer. Electronics 2020, 9, 476.

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