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Related Concept Videos

Maximum Power Transfer01:16

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Numerous practical applications within engineering disciplines, such as telecommunications, necessitate optimizing power delivery to a connected load. This pursuit, however, entails inherent internal losses, which can either equal or exceed the power supplied to the load. The Thevenin equivalent circuit is helpful in finding the maximum power a linear circuit can deliver to a load. It is assumed in this context that the load resistance can be adjusted.
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Implantation and Control of Wireless, Battery-free Systems for Peripheral Nerve Interfacing
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Coherently Enhanced Wireless Power Transfer.

Alex Krasnok1, Denis G Baranov2,3, Andrey Generalov4

  • 1Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, Texas 78712, USA.

Physical Review Letters
|April 26, 2018
PubMed
Summary

Coherently enhanced wireless power transfer (WPT) uses a backward signal to dynamically control energy extraction. This method overcomes environmental changes for optimal WPT system performance.

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Area of Science:

  • Electromagnetics
  • Wireless Communications
  • Energy Transfer

Background:

  • Antenna-based electromagnetic energy extraction is fundamental to wireless communications and wireless power transfer (WPT).
  • Optimal energy transfer requires conjugate matching, which is sensitive to environmental variations.
  • Environmental changes disrupt the optimal operation of WPT systems.

Purpose of the Study:

  • To introduce a novel method for dynamic control of power transfer in WPT systems.
  • To overcome the limitations of environmental variability affecting conjugate matching.
  • To enhance the efficiency and reliability of wireless power transfer.

Main Methods:

  • Development of a theoretical model for coherently enhanced WPT.
  • Utilizing coherent excitation of a waveguide with a backward propagating signal.
  • Employing full-wave numerical simulations and experimental verification.

Main Results:

  • Demonstrated dynamic control of power transfer in WPT systems.
  • Achieved a largely increased amount of extracted energy through interference.
  • Verified the concept's effectiveness in both near-field and far-field regimes.

Conclusions:

  • Coherently enhanced WPT provides a robust solution for stable and efficient energy transfer.
  • The proposed method enables adaptive impedance matching, enhancing WPT performance.
  • Experimental validation confirms the practical applicability of the technique.