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Wireless power transfer in-band communication system

  • US 10,411,831 B2
  • Filed: 03/17/2014
  • Issued: 09/10/2019
  • Est. Priority Date: 10/26/2012
  • Status: Active Grant
First Claim
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1. A wireless charging in-band communication system comprising:

  • a load device including a first coil and a switched impedance coupled in parallel with the first coil, the load device being configured to transmit a message packet at least in part by;

    generating a preamble comprising a synchronization sequence that has no more than three consecutive “

    1”

    states,encoding a payload according to a channel encoding scheme to generate an encoded payload,applying a modulation scheme that ensures no more than three consecutive “

    1”

    states are transmitted to the encoded payload to generate a modulated payload without applying the modulation scheme to the preamble,inverting the preamble to generate an inverted preamble, andtransmitting the inverted preamble and the modulated payload by controlling the switched impedance to change a reflected impedance seen by another device electromagnetically coupled to the first coil; and

    a source device including a second coil configured to electromagnetically couple to the first coil, the source device being configured to receive the message packet from the load device at least in part by detecting changes in the reflected impedance of the load device and decode the encoded payload.

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