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All-in-one method for wireless connectivity and contactless battery charging of small wearables

  • US 10,356,537 B2
  • Filed: 12/01/2017
  • Issued: 07/16/2019
  • Est. Priority Date: 12/01/2017
  • Status: Active Grant
First Claim
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1. A wearable device comprising:

  • a battery;

    an antenna coil;

    a wireless charging module coupled to the antenna coil to harvest wireless power for charging the battery;

    an NFC (near field communications) module coupled to the antenna coil to receive a query signal and provide a tag response signal;

    an NFMI (near field magnetic induction) module coupled to the antenna coil to send and receive audio streams;

    a controller; and

    an adjustable capacitance in series or parallel with said antenna coil to provide a tunable resonant frequency, wherein the controller adjusts the resonant frequency to a value suitable for a selected one of said wireless charging, NFC, and NFMI modules.

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