Zero voltage switching AC relay circuit

Details Zero voltage switching AC relay circuit Zero voltage switching AC relay circuit

1980-06-30

1982-07-13

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307252T, 307311, 307252VA, 323320, H03K 1772

Patent

active

043396704

ABSTRACT:
An improved zero voltage switching AC relay circuit is disclosed which includes two photo sensitive silicon controlled rectifiers (photo-SCRs) connected in inverse parallel as the active switching elements. The photo-SCRs are triggered into conduction by a light source including two light emitting diodes. Zero voltage switching circuitry is also provided which prevents the photo-SCRs from being triggered into conduction by the light source except when the value of the AC voltage being controlled is within a predetermined limit of zero volts. This is accomplished by using the collector-emitter circuit of a transistor to shunt the gate-cathode circuit of each photo-SCR. A transistor is provided for each photo-SCR, and the bases of the transistor are connected to each other by a single current limiting resistor.

REFERENCES:
patent: 3816763 (1974-06-01), Korn et al.

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