More Powerful Wireless Charging System Using "Hotspots"

Technology #15192

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David P. Arnold
Alexandra Garraud
Nicolas Garraud
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Lenny Terry
Assistant Director 352-392-8929
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US Patent Pending

A Wireless Power Transmission System that Transfers Electrical Power to Devices Without Direct Contact

This wireless power transmission system provides power to multiple devices within a volume of space, potentially as large as a room. The age of battery-powered electronics has created a huge demand for convenient recharging technologies. For many applications, traditional recharging via wire connections or physical contact can be inconvenient, costly or difficult. The demand for wireless power transfer technology is so great that the market is predicted to reach $11.8 billion by 2020. This wireless power transmission affords more flexibility than available systems, charging devices more conveniently. Other technologies require the receiver to rest directly on top of the transmitter; this device allows for wireless charging of multiple devices within a large area and without specific restrictions on their position or orientation. Transmitters can be mounted and placed in one or more locations in a room and the devices automatically charge, whether the receiver is in a clear line of sight, in a person’s pocket, or implanted in a person’s body. This wireless power transfer system provides more power over a larger distance than other technologies on the market and can transfer through metal and other conductive media.

Application

Wireless power transfer system that provides fast and efficient charging to devices within the area of the transmitter, without direct contact

Advantages

  • Uses low-frequency magnetic fields, enabling power transfer through metal and other conductive media
  • Allows distance between the transmitter and receiver, eliminating the need for a clear line of vision between the transmitter and receiver
  • Starts power transfer when a device enters a hotspot, eliminating the need for contact to recharge electronic devices
  • Provides charging of multiple devices over a larger volume of space, allowing performance under complicated operating conditions

Technology

Researchers at the University of Florida have developed a wireless power transfer approach that uses one or more transmitters to create a time-varying magnetic field. The field can range from a frequency of a few hertz to hundreds of hertz. This magnetic field excites the rotation of a small permanent magnet inside the receiver, which then generates power to one or more embedded coils. The system does not require resonance and can wirelessly transfer power to multiple receivers within the surrounding area between the transmitter and receiver.