Zero crossover detector

Details Zero crossover detector Zero crossover detector

1979-05-01

1981-05-19

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307290, 328150, H03K 5153, H03K 3295

Patent

active

042687640

ABSTRACT:
An A.C. zero crossover detection circuit compensates for RC phase lead by adding hysteresis to the reference voltage. A reference voltage is applied directly to a first input of a differential amplifier and indirectly through first and second resistor connected field-effect-transistors to a second input of the differential amplifier. An output of the amplifier is coupled to the gate of an MOS switch which, when turned on, reduces the reference voltage by a predetermined amount to compensate for early crossover detection resulting from the phase lead.

REFERENCES:
patent: 3416004 (1968-12-01), Taylor
patent: 3718864 (1973-02-01), Kelly et al.
patent: 3916328 (1975-10-01), Wilson
A. R. Hawkins, Wide Range and High Accuracy, Schmitt Electronic Engineering, May 1975, pp. 29-30.
P. R. Epley et al., Schmitt Trigger Circuit, IBM Technical Disclosure Bulletin, vol. 16, No. 5, Oct. 1973, pp. 1600-1601.

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