Abstract
A frequency-tuned magnetic resonance-based wireless power transfer system with near-constant efficiency up to 24 cm distance
Highlights
Coupling between coils in magnetic resonance-based wireless power transfer systems is quite sensitive to separation and misalignment between the coils
Recent developments in magnetic resonance-based wireless power transfer systems pave the way for coupling-independent power transfer to some extent [4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21]
An equivalent circuit model is utilized for choosing suitable coil size, source, and load resistances for the given design specifications in terms of peak efficiency and distance
Summary
Coupling between coils in magnetic resonance-based wireless power transfer systems is quite sensitive to separation and misalignment between the coils. Almost-constant peak power transfer efficiency ( ηmax ) can be obtained at two split resonance frequencies called fodd and feven , as the distance between the coils varies as long as the distance is less than the critical coupling distance ( dcritical ) [22, 23]. An equivalent circuit model is utilized for choosing suitable coil size (number of turns), source, and load resistances for the given design specifications in terms of peak efficiency and distance. To the best of the authors’ knowledge, this paper presents the first systematical way for choosing the optimal number of turns to reach given design specifications in terms of efficiency and the distance for frequency-tuned wireless power transfer systems
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