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Wireless power transmission system

  • US 20080309452A1
  • Filed: 06/14/2007
  • Published: 12/18/2008
  • Est. Priority Date: 06/14/2007
  • Status: Active Grant
First Claim
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1. A wireless power transmission system, comprising:

  • a microwave power transmitter having a control logic circuit and a phased array antenna having a plurality of microwave array emitters for emitting a power transmission signal, the emitters being adaptively-phased by the control logic circuit, the power transmitter further having a receiver operable on a side channel frequency;

    a device to be charged having a rectenna and a transmitter operable on the side channel frequency, the device to be charged having a power signal strength reporting circuit automatically communicating the received strength of the power transmission signal to the power transmitter on the side channel; and

    means for switching phase and selectively activating individual ones of the microwave array emitters in response to power signal strength reports from the device to be charged in order to adjust the phase of the power transmission signal to maximize efficiency of power transmission from the power transmitter to the device to be charged, while obviating the necessity of information regarding a location of the device to be charged.

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