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Power interrupt device with remote activity detector

  • US 5,548,764 A
  • Filed: 04/30/1993
  • Issued: 08/20/1996
  • Est. Priority Date: 04/30/1993
  • Status: Expired due to Fees
First Claim
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1. A power interrupt device comprising:

  • a detector for sensing an activity remote from said detector and for producing an electrical signal, wherein said electrical signal conveys a first voltage during times in which said activity is present and wherein said electrical signal conveys a second voltage during times in which said activity ceases;

    a clocking circuit configured with an input signal connection for receiving said electrical signal from said detector, and wherein said clocking circuit is further configured for producing a clocking output upon receiving said second voltage of said electrical signal;

    a counter circuit configured with an input signal connection wherein said input signal connection receives said clocking output of said clocking circuit, and wherein said counter circuit produces a pulse after a number of transitions of said clocking output have occurred;

    a latching circuit connected to said counter circuit for latching said pulse at a steady state until said electrical signal conveys said first voltage; and

    a switch having a conductive path wherein said conductive path is disconnected during times in which said pulse is latched at a steady state and wherein said conductive path is connected during times in which said pulse is not latched at a steady state.

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