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Controlling inductive power transfer systems

  • US 10,158,255 B2
  • Filed: 12/06/2016
  • Issued: 12/18/2018
  • Est. Priority Date: 05/11/2004
  • Status: Active Grant
First Claim
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1. A portable device separable from a primary unit, the portable device comprising:

  • a secondary adapted to couple with a field generated by a primary unit such that power is received inductively from the primary unit without direct electrical conductive contacts, said secondary adapted to impose a load associated with the portable device on the primary unit;

    a load control unit operably coupled to said secondary, said load control unit capable of selectively changing said load imposed by the portable device on the primary unit;

    wherein said load control unit is configured to affect said load to impose a first load on the primary unit during a first measurement period conducted by the primary unit to determine friendly parasitic information about the portable device;

    wherein said load control unit is configured to affect said load to impose a second load on the primary unit during a second measurement period conducted by the primary unit to determine friendly parasitic information about the portable device, wherein said second load is different from said first load; and

    wherein at least one of the first and second loads is based at least in part on a friendly parasitic load of the portable device.

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