Solid state relay with zero crossover feature

Details Solid state relay with zero crossover feature Solid state relay with zero crossover feature

1978-01-10

1979-06-12

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307252UA, 323 18, 323 21, H03K 1772

Patent

active

041581504

ABSTRACT:
A solid state relay in which the control circuit for controlling a bidirectional conduction device (triac) includes a silicon controlled rectifier (SCR) and a photo transistor that is responsive to a light coupled control signal. Both the SCR and the photo transistor are coupled in parallel between the d.c. terminals of a full wave rectifier. The base of the photo transistor and the gate of the SCR are coupled to the collector of a transistor that is connected in an common emitter configuration between the d.c. terminals of the rectifier. The last-named transistor has its base connected to the collector of the photo transistor. The last-named transistor is a zero voltage crossover detector and conducts only when the photo transistor is nonconducting. The photo transistor and SCR may conduct only when the crossover detector transistor is nonconducting.

REFERENCES:
patent: 3935482 (1976-01-01), Fox, Jr. et al.
patent: 4038584 (1977-07-01), Tarchalski et al.

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