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WIRELESS INDUCTIVE POWER TRANSFER

  • US 20170170686A1
  • Filed: 03/20/2015
  • Published: 06/15/2017
  • Est. Priority Date: 03/31/2014
  • Status: Active Grant
First Claim
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1. A wireless power transfer system including a power transmitter arranged to provide a power transfer to a plurality of power receivers via a wireless inductive power signal generated by at least one transmit inductor of the power transmitter;

  • the power transmitter comprising;

    a receiver for receiving data messages, the data messages being load modulated on the wireless inductive power signal by at least one of the plurality of power receivers;

    a broadcast transmitter for broadcasting on a broadcast communication channel;

    each of the plurality of power receivers comprising;

    a transmitter for transmitting data messages to the power transmitter by load modulation of the wireless inductive power signal;

    whereinthe power transmitter comprises a communication controller which is arranged to broadcast first indications on the broadcast communication channel, a first indication being indicative of the wireless inductive power signal being available in a time interval for communication of a data message from a power receiver of the plurality of power receivers by load modulation of the wireless inductive power signal;

    at least a first power receiver of the plurality of power receivers comprises;

    a broadcast receiver for receiving first indications from the power transmitter on the broadcast communication channel;

    a transmission controller arranged to align transmissions of data messages with received first indications by controlling a timing of transmissions of data messages to correspond to time intervals indicated by the first indications.

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