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System and method for triggering power transfer across an inductive power coupling and non resonant transmission

  • US 9,354,620 B2
  • Filed: 11/03/2014
  • Issued: 05/31/2016
  • Est. Priority Date: 05/03/2012
  • Status: Active Grant
First Claim
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1. A method of triggering power transmission in an inductively coupled power transmission system comprising:

  • a. waiting a time duration;

    b. electrically exciting a primary coil in a power transmitter;

    c. receiving a signal indicative of resonance properties of said primary coil;

    d. determining if a secondary coil in a power receiver is inductively coupled to said primary coil by;

    determining a change in effective inductance of said primary coil;

    determining a change in effective resistance of said primary coil; and

    determining a match between;

    values indicative of effective inductance of said primary coil, and values indicative of effective resistance of said primary coil; and

    at least one set of values associated with a primary coil inductively coupled to a secondary coil; and

    e. triggering power transmission from said primary coil to said secondary coil if said secondary coil is inductively coupled to said primary coil, or repeating steps a-d if said secondary coil is not inductively coupled to said primary coil.

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