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High voltage start-up circuit and method therefor

  • US 5,815,383 A
  • Filed: 12/27/1996
  • Issued: 09/29/1998
  • Est. Priority Date: 06/15/1995
  • Status: Expired due to Term
First Claim
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1. A high voltage start-up circuit for a switchmode power supply comprising, in combination:

  • switching means for turning off and on a high voltage input line of said start-up circuit and for limiting a current flow from said high voltage input line to an output of said start-up circuit;

    comparator means coupled to said switching means for sending a signal to turn on said switching means when an output voltage of said start-up circuit falls below a first set value and for sending a signal to turn off said switching means when said output voltage falls below a second set value.

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  • 3 Assignments
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