System and method of providing communications in a wireless power transfer system

  • US 9,407,332 B2
  • Filed: 04/04/2014
  • Issued: 08/02/2016
  • Est. Priority Date: 02/07/2011
  • Status: Active Grant
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First Claim
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1. A method of communicating data between a remote device and an inductive power supply using keyed modulation, said method comprising:

  • receiving inductive power via a variable frequency power transmission signal from the inductive power supply;

    encoding a data stream of bits into a fixed frequency communication signal, wherein the data stream is represented in the fixed frequency communication signal by one or more high signal levels and one or more low signal levels;

    modulating the fixed frequency communication signal on the variable frequency power transmission signal according to first and second respective signal level modulation frequencies by toggling a load of a communication transmitter according to the first respective signal level modulation frequency for each of the one or more high signal levels of the fixed frequency communication signal and by toggling the load of the communication transmitter according to the second respective signal level modulation frequency for each of the one or more low signal levels of the fixed frequency communication signal,wherein each bit of the data stream is represented by a plurality of amplitude modulations generated by toggling the load between a high state and a low state according to at least one of the first and second respective signal level modulation frequencies, wherein the load is toggled on the variable frequency power transmission signal; and

    varying the first and second respective modulation frequencies based on variations in a frequency of the variable frequency power transmission signal, wherein a number of the plurality of amplitude modulations associated with each bit of the data stream varies based on changes in the first and second respective signal level modulation frequencies.

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