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Electronic system with variable threshold power failure signaling

  • US 5,437,040 A
  • Filed: 01/31/1994
  • Issued: 07/25/1995
  • Est. Priority Date: 12/20/1991
  • Status: Expired due to Fees
First Claim
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1. An electronic system having a power failure monitoring function, said system comprising:

  • monitoring means for monitoring DC power parameters of the electronic system, said DC power parameters including system voltage;

    means operatively associated with said monitoring means for determining an instantaneous variable parameter from said DC power parameters;

    means for periodically determining a threshold voltage, said threshold voltage being derived at least in part from said instantaneously variable parameter of said system;

    comparison means for periodically comparing said system voltage to said threshold voltage and for determining whether said system voltage is less than said threshold voltage; and

    signal means operatively associated with said comparison means for outputting a signal indicative of an impending power failure when said system voltage is less than said threshold voltage.

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