Optically coupled device with high current protection

Details Optically coupled device with high current protection Optically coupled device with high current protection

1995-12-08

1998-01-13

Allen, Stephone

Radiant energy

Photocells; circuits and apparatus

Signal isolator

327514, G02B 2700

Patent

active

057082774

ABSTRACT:
An optically coupled device is composed of input and output sides. The input side includes a light-emitting element while the output side includes: an element for driving; a light-receiving element for receiving light from the light-emitting element to turn on the element for driving; and a resistance element having a positive or negative temperature-coefficient and connected in series with the light-receiving element. By the above configuration, the optically coupled device by itself is constructed to prevent rush-current from occurring and to the device itself from being excessively heated due to excessive current.

REFERENCES:
patent: 3996475 (1976-12-01), Rodriguez
patent: 4121122 (1978-10-01), Pokrandt
patent: 4143287 (1979-03-01), Biggs
patent: 4535251 (1985-08-01), Herman et al.
patent: 5216303 (1993-06-01), Lu
patent: 5418381 (1995-05-01), Aizawa
patent: 5559340 (1996-09-01), Nakamura et al.

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