Coupling circuit using a photocoupler

Details Coupling circuit using a photocoupler Coupling circuit using a photocoupler

1977-01-31

1978-09-12

Miller, Jr., Stanley D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

250211J, 361 56, 361 91, H03K 1700

Patent

active

041140540

ABSTRACT:
A solid state relay is arranged in high density to connect a first circuit comprising an outer signal source to a second circuit for driving a load by a photocoupler. A diode or a capacitor is connected in parallel to the light-receiving element of the photocoupler to maintain the voltage between the terminals of the light-receiving element to less than the reverse breakdown voltage of the light-receiving element when a surge voltage having rapid rise time is applied between the input side and the output side of the photocoupler.
A transistor which causes the reverse breakdown prior to the reverse breakdown of the light-receiving element can be connected in parallel to the light-receiving element.

REFERENCES:
patent: 3436548 (1969-04-01), Baird et al.
patent: 3535532 (1970-10-01), Merryman
patent: 3708672 (1973-01-01), Marinkovic
patent: 3801837 (1974-04-01), Pease et al.
patent: 3812382 (1974-05-01), Pascente
patent: 3816763 (1974-06-01), Korn et al.
patent: 3911297 (1975-10-01), Mervin et al.
patent: 3940634 (1976-02-01), Grogan
patent: 3958175 (1976-05-01), Braun

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