Optoelectronic relay circuit having charging path formed by a sw

Details Optoelectronic relay circuit having charging path formed by a sw Optoelectronic relay circuit having charging path formed by a sw

1990-03-06

1991-10-15

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Signal isolator

307311, G02B 2700

Patent

active

050576941

ABSTRACT:
A semiconductor relay circuit includes an output FET connected to a diode array. The diode array generates a photovoltaic output in response to a light signal from a light emitting element. Across the drain and gate of the FET is a series circuit of a semiconductor device and a rectifier is connected, the switching transistor is being made conductive upon receipt at the diode array of the light signal and forms a charge current path for an accumulated charge across the gate and source of the FET. The rectifier restrains a photocurrent from reversely flowing between the drain and gate of the FET. Turning-on and turning-off operations of the relay circuit can be thereby made both achievable at a higher speed, and the reverse flow of the photocurrent upon the conduction of the output FET can be prevented from occurring.

REFERENCES:
patent: 4390790 (1983-06-01), Rodriguez
patent: 4777387 (1988-10-01), Collins
patent: 4801822 (1989-01-01), Idaka et al.
patent: 4912335 (1990-03-01), Ehalt et al.
patent: 4931656 (1990-06-01), Ehalt et al.

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