Optically coupled solid state relay

Details Optically coupled solid state relay Optically coupled solid state relay

1981-06-11

1983-11-01

Miller, S. D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307252T, 307252UA, 307317R, H03K 1760, H03K 2312

Patent

active

044131933

ABSTRACT:
An optically coupled solid state relay circuit is disclosed. A light emitting diode input circuit is utilized to trigger a photosensitive transistor. A trim resistor in the base of the photosensitive transistor is utilized to adjust the sensitivity of the circuit. The photosensitive transistor is utilized, in conjunction with other circuitry, to control a silicon controlled rectifier which provides gate drive to a triac. Voltage limiting circuitry is provided to insure that the solid state relay will switch only during those periods within a selected range of the zero crossing of the line voltage and half of the bridge circuit which provides single polarity operating voltages is comprised of fast recovery diodes to improve the circuit's ability to withstand rapid polarity reversals.

REFERENCES:
patent: 3691403 (1972-09-01), Newmeyer
patent: 3723769 (1973-03-01), Collins
patent: 3881118 (1975-04-01), Forrest et al.
patent: 4129791 (1978-12-01), Sata
patent: 4158150 (1979-06-01), Dever
IBM Tech. Disclre. Bltn., Photodetector and Method of Calibrating Same by R. S. Palmer, vol. 16, No. 8, Jan. 1974, pp. 2469 and 2470.

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