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Systems and methods for low-power lamp compatibility with a trailing-edge dimmer and an electronic transformer

  • US 9,635,723 B2
  • Filed: 04/30/2014
  • Issued: 04/25/2017
  • Est. Priority Date: 08/30/2013
  • 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 an electronic transformer, wherein the load comprises a lamp, and wherein the controller is configured to;

    operate a single-stage power converter in a first power mode for a first period of time, such that the single-stage power converter is enabled to transfer energy from the secondary winding to the load during the first power mode; and

    operate the single-stage power converter in a second power mode for a second period of time prior to the first period of time, such that the single-stage power converter is enabled to transfer energy from the secondary winding to the load during the second power mode, wherein the first power mode and the second power mode occur within a half-line cycle of an electronic transformer secondary signal present on the secondary winding; and

    predict based on an electronic transformer secondary signal an estimated occurrence of a beginning of oscillation of the electronic transformer;

    wherein the second period of time begins at approximately the estimated occurrence of the beginning of oscillation.

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