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Power limiting for flyback converter

  • US 9,917,521 B1
  • Filed: 09/15/2016
  • Issued: 03/13/2018
  • Est. Priority Date: 09/15/2016
  • Status: Active Grant
First Claim
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1. A power circuit comprising:

  • a transformer arranged to store energy between a primary-side of the power circuit and a secondary-side of the power circuit;

    a primary switch coupled to a primary-side winding of the transformer; and

    a controller configured to;

    switch-on the primary switch during a current switching cycle;

    responsive to determining that a voltage indicative of a primary current through the primary switch exceeds a direct-current (DC) voltage threshold, switch-off the primary switch during the current switching cycle; and

    automatically tune, according to an input voltage and an amount of primary inductance at the primary-side winding, a maximum primary current limitation threshold associated with the primary switch by at least;

    responsive to determining that a peak value of the voltage during the current switching cycle is higher than a target value associated with the peak value of the voltage, increasing the target value for a subsequent switching cycle of the primary switch, wherein the target value is indicative of the maximum primary current limitation threshold; and

    responsive to determining that the peak value of the voltage during the current switching cycle is lower than the target value, decreasing the target value for the subsequent switching cycle of the primary switch.

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