Coupling-Independent Capacitive Wireless Power Transfer Using Frequency Bifurcation

Ben Minnaert, Franco Mastri, Nobby Stevens, Alessandra Costanzo and Mauro Mongiardo
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Ben Minnaert: KU Leuven, DRAMCO, Department of Electrical Engineering (ESAT), Technology Campus Ghent, 9000 Ghent, Belgium
Franco Mastri: Department of Electrical, Electronic and Information Engineering Guglielmo Marconi, University of Bologna, 40136 Bologna, Italy
Nobby Stevens: KU Leuven, DRAMCO, Department of Electrical Engineering (ESAT), Technology Campus Ghent, 9000 Ghent, Belgium
Alessandra Costanzo: Department of Electrical, Electronic and Information Engineering Guglielmo Marconi, University of Bologna, 40136 Bologna, Italy
Mauro Mongiardo: Department of Engineering, University of Perugia, 06123 Perugia, Italy

Energies, 2018, vol. 11, issue 7, 1-13

Abstract: Capacitive wireless power transfer can be realized by mutually coupled capacitors operating at a common resonant frequency. An optimal load exists that maximizes either the efficiency or the power transfer to the load. In this work, we utilize the frequency bifurcation effect to propose a frequency agile mode that allows for a nearly coupling-independent regime. We analytically determine the operating conditions of the coupling-independent mode based on the different system gains. In this way, we obtain a solution that achieves nearly constant efficiency and power transfer, even at varying coupling. We compare our results to inductive wireless power transfer where a perfect coupling-independent mode is achievable.

Keywords: capacitive wireless power transfer; coupling factor; frequency bifurcation; resonance; wireless power transfer (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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