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Voltage monitoring circuit

  • US 4,613,770 A
  • Filed: 12/04/1984
  • Issued: 09/23/1986
  • Est. Priority Date: 09/29/1980
  • Status: Expired due to Fees
First Claim
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1. A system for determining whether a direct current voltage across a pair of terminals is within an acceptable lower absolute magnitude range, or within an acceptable higher absolute magnitude range, or in a forbidden zone outside either of these ranges, comprising means for scaling down the voltage across the terminals to provide a first voltage related in magnitude to the voltage across the terminals, means for establishing a reference direct current voltage, means for comparing the first related voltage to the reference voltage and for switching in response to comparison outcome, the comparing and switching means having a first state when the first related voltage corresponds to a voltage across the terminals which is within the acceptable lower absolute magnitude range, and second means for comparing a second voltage related in magnitude to the voltage across the terminals to the reference voltage to determine whether the voltage across the terminals is greater than the highest acceptable magnitude of the lower magnitude range by a predetermined amount and for switching in response to such comparison outcome, the second comparing means having a first state when the voltage across the terminals does not exceed the highest acceptable limit of the lower magnitude range by the predetermined amount and a second state when the voltage across the terminals exceeds the highest acceptable limit of the lower magnitude range by the predetermined amount, the second comparing means, when in its second state, scaling down the first related voltage.

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