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Isolated drive circuitry used in switch-mode power converters

  • US 6,791,851 B2
  • Filed: 08/26/2003
  • Issued: 09/14/2004
  • Est. Priority Date: 02/01/2001
  • Status: Expired due to Term
First Claim
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1. A method for disabling a switch-mode power converter having a drive transformer winding connected to a switch conduction control circuit and said switch conduction control circuit referenced to the input of the power converter from a condition sensed on the output of the power converter, the method comprising the steps of:

  • sensing a condition on the output of the power converter that requires the power converter to be disabled;

    shorting a drive transformer winding connected to circuitry referenced to the output side of the power converter;

    detecting excessive current across a drive transformer winding connected to said switch conduction control circuit connected to the input side of the power converter; and

    sending a signal to disable the switch conduction control circuit, thus disabling the converter.

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