Wireless power transmission system

  • US 8,446,248 B2
  • Filed: 06/14/2007
  • Issued: 05/21/2013
  • Est. Priority Date: 06/14/2007
  • Status: Active Grant
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First Claim
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1. A wireless power transmitter, comprising:

  • a controller;

    a phased array antenna having a plurality of microwave array emitters each for emitting a power transmission signal, the emitters being adaptively-phased by the controller to emit the power transmission signal at a respective selected phase; and

    a receiver operable on a side channel frequency to receive a plurality of multipath power signal strength signals from a device to be charged by the microwave power transmission signals;

    the controller further configured to selectively activate each individual microwave array emitter to transmit the power transmission signal at a first selected phase from that activated individual microwave array emitter, the controller further configured to adjust the respective selected phase by an increment of the activated individual microwave array emitter in response to a first power signal strength signal received from the device to be charged in order to adjust the phase of the power transmission signal from that activated individual microwave array emitter and wherein the controller is configured to receive subsequent multipath power signal strength reports from the device to be charged and adjust the respective selected phase of that activated individual microwave array emitter by an additional increment in response to the subsequent power signal strength reports if the subsequent power signal strength report indicates the power level at which the power transmission signal was received is lower than the power level at which the prior power transmission signal was received from that activated individual microwave array emitter;

    wherein each microwave array emitter emits the power transmission signal to the device to be charged without utilizing a location signal, if any, from the device to be charged that indicates a location of the device to be charged;

    wherein the microwave transmitter and device to be charged are not required to be in line of sight of each other, andwherein the microwave transmitter is non-directional.

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