Window comparator

Details Window comparator Window comparator

1976-11-02

1977-10-25

Heyman, John S.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307350, 307265, 328150, H03K 5153

Patent

active

040557774

ABSTRACT:
A window comparator comprising two operational amplifiers, a first one with two feedback circuits, each feedback circuit having a diode connected to the amplifier output and poled for forward current conduction of opposite polarity, to provide an algebraic difference between an input signal and a selected set-point voltage such that one diode conducts and then switches off while the other is held off and then conducts when the sign of the algebraic difference switches. Differential input terminals of the second operational amplifier are connected to the separate feedback circuits of the first operational amplifier, one input terminal to the output of one diode, and the other to the output of the other diode. A selected window-width voltage is connected through a coupling resistor to one of the input terminals of the second operational amplifier to determine when the algebraic difference of the input signal and the set-point voltage has exceeded a predetermined tolerance after that difference has changed signs.

REFERENCES:
patent: 3753012 (1973-08-01), Frederiksen et al.
patent: 3879662 (1975-04-01), Barneck
patent: 3890575 (1975-06-01), Tawfif
patent: 3999084 (1976-12-01), Beadette

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