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Energies 2017, 10(9), 1444; doi:10.3390/en10091444

Optimal Analytical Solution for a Capacitive Wireless Power Transfer System with One Transmitter and Two Receivers

Research Group DraMCo, ESAT, Technology Campus Ghent, KU Leuven, 9000 Gent, Belgium
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Received: 24 August 2017 / Revised: 14 September 2017 / Accepted: 15 September 2017 / Published: 19 September 2017
(This article belongs to the Special Issue Wireless Power Transfer and Energy Harvesting Technologies)
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Abstract

Wireless power transfer from one transmitter to multiple receivers through inductive coupling is slowly entering the market. However, for certain applications, capacitive wireless power transfer (CWPT) using electric coupling might be preferable. In this work, we determine closed-form expressions for a CWPT system with one transmitter and two receivers. We determine the optimal solution for two design requirements: (i) maximum power transfer, and (ii) maximum system efficiency. We derive the optimal loads and provide the analytical expressions for the efficiency and power. We show that the optimal load conductances for the maximum power configuration are always larger than for the maximum efficiency configuration. Furthermore, it is demonstrated that if the receivers are coupled, this can be compensated for by introducing susceptances that have the same value for both configurations. Finally, we numerically verify our results. We illustrate the similarities to the inductive wireless power transfer (IWPT) solution and find that the same, but dual, expressions apply. View Full-Text
Keywords: capacitive wireless power; inductive wireless power; maximum power transfer; multiports; power transfer; three-port networks; wireless power transfer capacitive wireless power; inductive wireless power; maximum power transfer; multiports; power transfer; three-port networks; wireless power transfer
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Minnaert, B.; Stevens, N. Optimal Analytical Solution for a Capacitive Wireless Power Transfer System with One Transmitter and Two Receivers. Energies 2017, 10, 1444.

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