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Monitoring circuit for a supply voltage

  • US 6,188,321 B1
  • Filed: 04/24/1998
  • Issued: 02/13/2001
  • Est. Priority Date: 04/26/1997
  • Status: Expired due to Fees
First Claim
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1. A monitoring circuit (10) for at least one supply voltage (UB), comprising:

  • a first threshold switch means (20), which generates a first warning signal (USWN) when the supply voltage (UB) drops below a first predetermined threshold value;

    a second threshold switch means (66), which generates a second warning signal (TOTUSN) after a fixed warning period tw has elapsed;

    each of the threshold switch means (20, 66) include an internal counting circuit for determining first and second time periods tv1, tv2;

    said first and said second generated warning signal (USWN, TOTUSN) is reset at the end of said first and second time periods.

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