Time-varying systems to improve the efficiency of wireless power transfer
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2024-05
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en
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Physical Review Applied, Volume 21, issue 5
Abstract
Conventional wireless-power-transfer (WPT) systems are linear and time invariant, which sets fundamental limitations on their performance, including a trade-off between transfer efficiency and the level of transferred power. In this paper, we introduce and study a possibility of temporal modulation for inductive wireless-power-transfer systems and uncover that this trade-off is avoided as a consequence of varying the inductive coupling strength in time. Our theoretical analysis reveals that under the optimal modulation depth and phase, the time modulation can yield a substantial improvement in the WPT efficiency, while the received power at the load is also improved compared to the static WPT reference system. We experimentally demonstrate the concept with a low-frequency system and observe a threefold improvement in efficiency over the reference static counterpart. This technical capability reconciles the inherent trade-off between the WPT efficiency and transferred power, paving the way for simultaneous advancements in both efficiency and delivered power.Description
Publisher Copyright: © 2024 American Physical Society.
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Wang, X, Krois, I, Ha-Van, N, Mirmoosa, M S, Jayathurathnage, P, Hrabar, S & Tretyakov, S A 2024, ' Time-varying systems to improve the efficiency of wireless power transfer ', Physical Review Applied, vol. 21, no. 5, 054027 . https://doi.org/10.1103/PhysRevApplied.21.054027