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Generating a control signal based on leading edge dimming detection for maintaining input current of a power converter

  • US 9,543,845 B2
  • Filed: 09/16/2014
  • Issued: 01/10/2017
  • Est. Priority Date: 10/15/2013
  • Status: Active Grant
First Claim
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1. A power converter, comprising:

  • an energy transfer element coupled between an input and an output of the power converter;

    a power switch coupled to the energy transfer element to control a transfer of energy between the input and the output of the power converter;

    a controller coupled to control switching of the power switch to regulate an output of the power converter;

    a leading edge dimming detection circuit coupled to generate a control signal in response to detecting leading edge dimming at the input of the power converter; and

    a damper circuit coupled to suppress a spike in an input current of the power converter, wherein the spike in the input current corresponds with a turn-on event of an input voltage of the power converter by a leading edge dimming circuit that is to be coupled to the input of the power converter, wherein the leading edge dimming detection circuit further includes a spike energy reclamation circuit coupled to the damper circuit to store energy generated by the spike in the input current and to generate the control signal in response thereto.

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