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Reducing corruption of communication in a wireless power transmission system

  • US 9,318,897 B2
  • Filed: 07/16/2010
  • Issued: 04/19/2016
  • Est. Priority Date: 07/21/2009
  • Status: Active Grant
First Claim
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1. A method for reducing data corruption in a wireless power transmission system comprising:

  • providing power from a power source to a transmitter;

    transmitting power from a primary coil in the transmitter to a secondary coil in a receiver by induction;

    rectifying a voltage induced on the secondary coil by the transmission of the power from the primary coil to the secondary coil;

    transmitting data from the receiver to the transmitter via backscatter modulation by varying a load across the secondary coil;

    continually measuring load current, storing a value representative of the measured load current, during the transmission of data from the receiver to the transmitter limiting a change in current through the receiver to a level within a predetermined value of the stored value of current just before a communication packet is sent utilizing a control circuit while the voltage is induced on the secondary coil, wherein the load continues to receive power during data transfer and interference with the data transfer is reduced.

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