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.
Coupling-independent capacitive wireless power transfer using frequency bifurcation / Minnaert, Ben*; Mastri, Franco; Stevens, Nobby; Costanzo, Alessandra; Mongiardo, Mauro. - In: ENERGIES. - ISSN 1996-1073. - ELETTRONICO. - 11:7(2018), pp. 1-13. [10.3390/en11071912]
Coupling-independent capacitive wireless power transfer using frequency bifurcation
Mastri, Franco;Costanzo, Alessandra;
2018
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.File | Dimensione | Formato | |
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