Zero crossing detecting circuit

Details Zero crossing detecting circuit Zero crossing detecting circuit

1975-04-21

1976-05-04

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307235N, 328147, H03K 5153

Patent

active

039551024

ABSTRACT:
A zero-crossing detecting circuit where the input signal is applied to positive and negative threshold circuits. Each threshold circuit is connected to the input of a respective one-shot circuit which responds to the beginning edge of each output signal from its threshold circuit. The output pulses of both one-shots are applied to a NOR circuit which thereby responds to the beginning edges but not the trailing edges of the signals from the threshold circuits. Accordingly, variations in the trailing edges of the signals from the threshold circuits due to hysteresis or varying propogation times do not effect the circuit's output.

REFERENCES:
patent: 3122729 (1964-02-01), Bothwell et al.
patent: 3600606 (1971-08-01), Clor, Jr.
patent: 3600607 (1971-08-01), Vatin
patent: 3743946 (1973-07-01), Gass et al.
patent: 3784921 (1974-01-01), Iadipaolo
patent: 3873853 (1975-03-01), Ahmed
patent: 3877025 (1975-08-01), Maio
hoskins, "Crossover Detector"; IBM Tech. Discl. Bull.; Vol. 14, No. 3, pp. 934; 8/1971.

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