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Radio frequency (RF) power harvesting circuit

  • US 10,224,759 B2
  • Filed: 07/07/2015
  • Issued: 03/05/2019
  • Est. Priority Date: 07/15/2014
  • Status: Active Grant
First Claim
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1. A wireless charging circuit comprising:

  • a radio frequency (RF) power harvesting circuit configured to;

    receive a wireless RF charging signal having a total RF power from a wireless charging station; and

    generate a direct-current (DC) charging signal having an effective charging power based on the wireless RF charging signal received from the wireless charging station to charge a battery; and

    a wireless charging controller configured to;

    determine a target charging power required by the battery based on a charging profile of the battery;

    compare the effective charging power in the DC charging signal against the target charging power required by the battery;

    reduce the effective charging power in the DC charging signal without affecting the total RF power in the wireless RF charging signal if the effective charging power is greater than the target charging power; and

    increase the effective charging power in the DC charging signal without affecting the total RF power in the wireless RF charging signal if the effective charging power is less than the target charging power.

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