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Adhoc mobile power connectivity using a wireless power transmission grid.

Pawan Gaire1, Dieff Vital2, Md Rayhan Khan2

  • 1Department of Electrical and Computer Engineering, Florida International University, Miami, 33174, USA. pgair001@fiu.edu.

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Summary

This study introduces a novel mesh network for wireless power transfer, enabling device charging over 5 feet away with user mobility. The system supports mobile devices, IoT, and wearables, overcoming hotspot limitations of current technologies.

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Area of Science:

  • Electrical Engineering
  • Wireless Communication
  • Power Electronics

Background:

  • Current wireless charging technologies are limited to near-field, point-to-point power transfer, restricting device coverage to small hotspots.
  • Existing methods necessitate close proximity between transmitters (Tx) and receivers (Rx), hindering the charging of mobile devices, IoT, and wearables.
  • The fundamental limitation of hotspot-based charging restricts the practical application of wireless power in dynamic environments.

Purpose of the Study:

  • To demonstrate a patented ad-hoc mesh networking method for wireless recharging over extended distances.
  • To enable wireless charging of moving targets, overcoming the limitations of hotspot-based systems.
  • To provide a more ergonomic and flexible wireless charging solution for various electronic devices.

Main Methods:

  • Utilized a mesh network of transmitter panels for wireless power transfer up to 5 feet.
  • Implemented a system compatible with Wireless Electrical Grid LANs (WiGL) for seamless integration.
  • Demonstrated charging of a smartphone in the radiating near-field zone with user mobility.
  • Employed 1W RF-transmitters operating in the 2.4 GHz ISM band.
  • Integrated antenna arrays, rectennas, power management, and USB 2.0 interfaces.

Main Results:

  • Achieved wireless recharging at over 5 feet with significant lateral movement allowance for the receiver.
  • Demonstrated an average received power of 10 dBm using 1W RF-transmitters.
  • Successfully charged a smartphone within the meshed network, allowing user movement.
  • Maintained charging voltage between 4.2 and 5.3 V for smooth power delivery.
  • Extended wireless grid coverage using multiple transmitting antennas and mechanical beam-steering.

Conclusions:

  • The developed ad-hoc mesh networking method offers a disruptive solution for wireless power transfer, enabling mobile charging.
  • This technology overcomes the range and mobility limitations inherent in traditional hotspot-based wireless charging systems.
  • The system provides a practical and ergonomic approach to wirelessly charging devices like smartphones, IoT devices, and wearables over greater distances.