Optically isolated interface circuits

Details Optically isolated interface circuits Optically isolated interface circuits

1976-03-31

1978-03-14

Miller, Jr., Stanley D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307237, 307DIG1, 307317R, H03K 1700

Patent

active

040792722

ABSTRACT:
Circuitry for providing electrical isolation between an input signal source and other circuitry which utilizes such input signal. The isolation circuitry uses an optical coupling means comprising a light-emitting diode circuit and a photo-responsive element, the input signal being supplied by a bridge circuit which provides a unidirectional voltage from the input signal which is then applied to a normalizing, or limiting, circuit which converts the unidirectional voltage to a substantially constant value which is supplied to the light-emitting diode circuit. The circuit is responsive to an input signal which can be an AC signal or a DC signal of either polarity, such circuit having a high degree of noise survivability even in the presence of transient noise signals such as "showering arcs" having extremely high amplitudes.

REFERENCES:
patent: 3691403 (1972-09-01), Newmeyer
patent: 3766409 (1973-10-01), Shuey
patent: 3767978 (1973-10-01), Wernli
patent: 3801837 (1974-04-01), Pease et al.
patent: 3848140 (1974-11-01), Guermeur et al.

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