Time-varying systems to improve the efficiency of wireless power transfer

Xuchen Wang*, I. Krois, N. Ha-Van, M. S. Mirmoosa, P. Jayathurathnage, S. Hrabar, S. A. Tretyakov

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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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.

Original languageEnglish
Article number054027
JournalPhysical Review Applied
Volume21
Issue number5
DOIs
Publication statusPublished - May 2024
MoE publication typeA1 Journal article-refereed

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