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Systems and methods for determining a type of transformer to which a load is coupled

  • US 9,072,125 B2
  • Filed: 03/13/2013
  • Issued: 06/30/2015
  • Est. Priority Date: 07/03/2012
  • Status: Active Grant
First Claim
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1. An apparatus comprising:

  • a controller to provide compatibility between a load and a secondary winding of a transformer driven at its primary winding by a dimmer, wherein the controller is configured to;

    determine from a transformer secondary signal whether the transformer comprises a magnetic transformer or an electronic transformer; and

    select a compatibility mode of operation from a plurality of modes of operation based on the determination of whether the transformer comprises a magnetic transformer or an electronic transformer, wherein the plurality of modes of operation comprise at least;

    a magnetic transformer compatibility mode, wherein the controller is configured to;

    determine from a magnetic transformer secondary signal a period of a half-line cycle of an output signal of the dimmer;

    determine from the magnetic transformer secondary signal an estimated occurrence of an end of a phase-cut angle of the dimmer; and

    generate a driving signal to the load based on the period and the estimated occurrence of the end of the phase-cut angle; and

    an electronic transformer compatibility mode.

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