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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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Consider a linear AC Thevenin equivalent circuit connected to a load impedance.
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High-Efficiency Wireless-Power-Transfer System Using Fully Rollable Tx/Rx Coils and Metasurface Screen.

Woosol Lee1, Yong-Kyu Yoon1

  • 1Electrical and Computer Engineering Department, University of Florida, Gainesville, FL 32611, USA.

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Summary

This study introduces a novel, flexible wireless power transfer (WPT) system utilizing rollable coils and metasurface (MS) screens. The MS screens significantly boost power transfer efficiency (PTE) and distance, even with misalignment.

Keywords:
beam focusingefficiency enhancementfully rollable WPT systemmetamaterialmetasurfacemisalignmentnegative refraction propertywireless power transfer (WPT)

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Area of Science:

  • Electrical Engineering
  • Materials Science
  • Electromagnetics

Background:

  • Wireless power transfer (WPT) systems face challenges in efficiency and range.
  • Existing WPT solutions often lack flexibility and reconfigurability.
  • Metasurfaces (MS) offer potential for electromagnetic field manipulation.

Purpose of the Study:

  • To develop a high-efficiency, reconfigurable WPT system.
  • To investigate the use of metasurface (MS) screens for enhancing WPT performance.
  • To demonstrate a flexible WPT system with rollable components.

Main Methods:

  • Integration of fully rollable transmitter (Tx) and receiver (Rx) coils.
  • Placement of metasurface (MS) screens between Tx and Rx coils.
  • Operation at a frequency of 6.78 MHz.
  • System performance evaluation at various power-transfer distances (PTD) and with multiple MS screens.

Main Results:

  • Significant enhancement in power-transfer efficiency (PTE) using MS screens across different PTDs.
  • PTE increased from 13.32% to 32.49% at 40 cm with one MS screen.
  • PTE increased from 5.42% to 42.25% at 50 cm with two MS screens.
  • Demonstrated improved PTE and PTD, and maintained efficiency under misalignment conditions.

Conclusions:

  • The proposed MS-based WPT system offers high efficiency and extended range.
  • The reconfigurable and rollable nature of the system allows for flexible spatial deployment.
  • Metasurface screens are effective in magnifying PTE and PTD, even in misaligned scenarios.