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Power supply device with detection of malfunctioning

  • US 20020044463A1
  • Filed: 07/30/2001
  • Published: 04/18/2002
  • Est. Priority Date: 07/31/2000
  • Status: Active Grant
First Claim
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1. A power supply device having an input terminal and an output terminal between which is connected a DC-DC converter circuit, said DC-DC converter circuit comprising:

  • an isolation transformer having primary and secondary windings, isolating an input portion of the DC-DC converter circuit from an output portion of the DC-DC converter;

    a power switch having a first output terminal and a control terminal; and

    a driving stage having a compensation terminal on which a compensation voltage is present and receiving a biasing current, said driving stage including a control circuit having a first input terminal connected to said compensation terminal and an output terminal connected to said control terminal of said power switch;

    said driving stage further including disconnection-detecting means connected to said compensation terminal and generating a signal for permanent turning-off of said power switch when said biasing current drops below a current threshold value.

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