A.C. type timer circuit

Details A.C. type timer circuit A.C. type timer circuit

1975-06-23

1977-01-11

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307252J, 307293, 323225C, H03K 1772

Patent

active

040029298

ABSTRACT:
Contactless two-line type timer circuit operable stably for a load of even a small current. In the circuit comprising substantially a full-wave rectifying circuit connected through the load to AC source, a thyristor connected across output terminals of the rectifying circuit and means for applying pulses to the gate of the thyristor after a predetermined time period, a first resistance is inserted between the cathode of the thyristor and negative side output terminal of the rectifying circuit and a second resistance is inserted between the gate of the thyristor and said negative side output terminal so as to allow the thyristor to be of a lower gate sensitivity and to be capable of keeping the gate voltage of the thyristor always larger than the cathode voltage.

REFERENCES:
patent: 3286621 (1966-11-01), Martin, Jr.
patent: 3694669 (1972-09-01), Witt et al.

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