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Reducing corruption of communication in a wireless power transmission system

  • US 9,954,402 B2
  • Filed: 04/18/2016
  • Issued: 04/24/2018
  • Est. Priority Date: 07/21/2009
  • Status: Active Grant
First Claim
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1. A wireless power transmission system in which power from a power source is transmitted from a transmitter through a coil to a receiver, comprising:

  • a receiver coil coupled to the transmitter coil;

    a rectifier circuit receiving an output of the receiver coil and generating a DC voltage;

    a circuit transmitting data to the transmitter across the inductive coupling via backscatter modulation by varying a load in the receiver;

    a control circuit controlling the current flow to the load through the receiver when the load is coupled to the receiver, a control circuit;

    continually measuring load current, storing a value representative of the measured load current, limiting current through the receiver to a level current within a predetermined value of the stored value just before a communications packet is sent when the receiver is transmitting data to the transmitter via backscatter modulation, wherein the load continues to receive power from the receiver during data transmission and interference with the data transmission is reduced.

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