Threshold crossover detector with improved digital noise rejecti

Details Threshold crossover detector with improved digital noise rejecti Threshold crossover detector with improved digital noise rejecti

1992-04-24

1994-01-11

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307542, 307491, 328150, H03K 5153

Patent

active

052784622

ABSTRACT:
The detector applies an analog input signal through respectively positive and negative offset voltages to the inputs of two comparators, one of which produces a first output signal as the input signal passes beyond a predetermined minimum voltage in the positive going direction, and the other of which produces a second output signal when the input voltage exceeds a minimum predetermined value in a negative going direction. The input signal is also applied directly to the input of a third comparator the output of which produces a third signal each time the input signal crosses over zero voltage in a positive going direction. The first and second comparator output signals are applied to the reset and set terminals, respectively, of a first flip flop. The output of this first flip flop, and the output of the third comparator are applied through an AND gate to the set terminal of a second flip flop. The second flip flop produces at its output a digital signal precisely at the time that a signal is produced at the output of the third comparator, provided the outputs of the first and second comparators have been successively generated in the cycle of the input voltage immediately preceding the output signal of the third comparator.

REFERENCES:
patent: 3955102 (1976-05-01), Chi
patent: 4090144 (1978-05-01), Jenik et al.
patent: 4575683 (1986-03-01), Roberts et al.
patent: 4609869 (1986-09-01), Metcalf
patent: 4652833 (1987-03-01), Batts
patent: 4924483 (1990-05-01), Cho
patent: 5019722 (1991-05-01), Hess et al.

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