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Overvoltage protection circuit for power supply

  • US 4,513,341 A
  • Filed: 07/25/1983
  • Issued: 04/23/1985
  • Est. Priority Date: 07/25/1983
  • Status: Expired due to Fees
First Claim
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1. Apparatus responsive to an overvoltage indication from an overvoltage sensing circuit of a power supply for interrupting electrical connection of a pair of input lines that are connected between the power supply and a power source, comprising:

  • first means having a primary conduction path thereof electrically connected in series in one of the power supply input lines, said first means conducting substantial current in said primary conduction path in said one line in response to a prescribed control voltage of greater than a prescribed value applied to a control lead thereof;

    second means electrically connected across the input lines for developing said control voltage of greater than the prescribed value at a node therebetween when the input lines are connected to the power source;

    third means for electrically connecting said node to the control lead of said first means for causing the latter to conduct current through the power supply when the control voltage is greater than the prescribed value; and

    latch means electrically connected between said node and said one input line and having an input terminal connected to the overvoltage sensing circuit, said latch means being responsive to an overvoltage signal from said sensing circuit on said input terminal for decreasing the value of control voltage to much less than the prescribed value for cutting off said first means for causing said first means to block current flow in said one input line.

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