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Startup Circuit and Power Converter Employing the Same

  • US 20110134664A1
  • Filed: 12/03/2009
  • Published: 06/09/2011
  • Est. Priority Date: 12/03/2009
  • Status: Active Grant
First Claim
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1. A startup circuit for a controller, comprising:

  • a charge accumulation circuit having a resistor series-coupled to a capacitor;

    a first Schmitt trigger having an input coupled to said capacitor;

    a second Schmitt trigger having an input coupled to an output of said first Schmitt trigger and configured to provide a bias voltage for said controller via said capacitor when an input voltage thereto exceeds a trip voltage.

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