Voltage comparator circuit for monitoring a process output volta

Details Voltage comparator circuit for monitoring a process output volta Voltage comparator circuit for monitoring a process output volta

1989-05-11

1990-04-10

Jennings, Derek S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 90, 340661, 307130, 324 99R, H02H 300

Patent

active

049165704

ABSTRACT:
A fluctuating voltage to be monitored is fed to the non-inverting input of a first op amp via a first input resistor; a reference voltage is fed to the inverting input of the second op amp via a second input resistor. The inverting input of the first op amp is taken from a first voltage divider connected between the reference voltage and ground; the non-inverting input of the second op amp is taken from a second voltage divider connected between the fluctuating voltage and ground. The power inputs of both op amps are connected to a positive voltage and ground. The output of both op amps is tied together, with a first feedback loop feeding the tied output voltage to the non-inverting input of the first op amp via a first high-resistance gain-setting resistor, and a second feedback loop feeding the tied output voltage to the inverting input of the second op amp via a second high-resistance gain-setting resistor. The range of acceptable values for the fluctuating voltage is established by selecting appropriate resistances for the resistors which comprise the pair of voltage dividers.

REFERENCES:
patent: 3931547 (1976-01-01), Glogolja
patent: 4835652 (1989-05-01), Billings et al.

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