Detection of coil coupling in an inductive charging system

  • US 10,110,051 B2
  • Filed: 06/19/2017
  • Issued: 10/23/2018
  • Est. Priority Date: 06/13/2014
  • Status: Active Grant
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First Claim
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1. A receiver device for use in an inductive charging system, comprising:

  • a receiver coil operatively connected to an input of an AC-to-DC converter;

    a rechargeable battery operatively connected to an output of the AC-to-DC converter;

    a first resonant circuit operatively connected in series between the receiver coil and the input of the AC-to-DC converter, the first resonant circuit associated with a first resonant frequency;

    a second resonant circuit operatively connected in series across leads of the first resonant circuit, the second resonant circuit associated with a second resonant frequency that is different from the first resonant frequency; and

    a switch configured to;

    connect the second resonant circuit across the leads of the first resonant circuit when rechargeable battery is fully charged; and

    disconnect the second resonant circuit from the first resonant circuit when the receiver device is receiving power.

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