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Peer to peer self-optimizing resonant inductive charger

  • US 9,806,555 B2
  • Filed: 07/07/2014
  • Issued: 10/31/2017
  • Est. Priority Date: 07/07/2014
  • Status: Active Grant
First Claim
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1. A mobile device, comprising:

  • a battery;

    device electronics powered by the battery, including a mobile wireless communication transceiver and a short range transceiver;

    a charging circuit in electronic connection with the battery; and

    a coil coupled to the charging circuit, the coil configured for wireless resonant inductive coupling with a tunable coil system of a wireless inductive charging device and for charging the battery via the charging circuit when wirelessly coupled to the tunable coil system; and

    wherein the mobile device is configured to;

    determine a power transfer efficiency between the coil and the tunable coil system during the wireless resonant inductive coupling for the charging of the battery, andtransmit to the wireless inductive charging device via the short range transceiver a signal to cause the wireless inductive charging device to increase power transfer by changing a setting of the tunable coil system to improve the power transfer efficiency between the coil and the tunable coil system when the determined power transfer efficiency is lower than a target efficiency level,a controller of the wireless inductive charging device changing the setting of the tunable coil system to improve the power transfer efficiency between the coil and the tunable coil system based on the signal,the changing of the setting of the tunable coil system including switching power transmission from a first coil of the tunable coil system to a second coil of the tunable coil system based on an orientation of the second coil to improve the power transfer efficiency.

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