Diagnosis apparatus for photo coupler and photo coupler device w

Details Diagnosis apparatus for photo coupler and photo coupler device w Diagnosis apparatus for photo coupler and photo coupler device w

1988-10-28

1990-06-26

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250214R, G01J 132

Patent

active

049374419

ABSTRACT:
A diagnosis apparatus for a photo coupler having at least one photo coupler including a light emitting element the amount of light emitted from which changes in accordance with the value of a current flowing therethrough and a light receiving element which receives the light from the light emitting element to convert it into an electric signal corresponding to the received amount of light, a checking current setting circuit for setting a current flowing through the light emitting element to a current value for checking, a level detecting circuit for controlling a current flowing through the light emitting element on the basis of the current value set by the checking current setting circuit, a reference signal generator for generating a reference signal, a comparing and detecting circuit for comparing the electric signal from the light receiving element with the reference signal and detecting the deterioration of a function of the photo coupler on the basis of the result of comparison.

REFERENCES:
patent: 3919546 (1975-11-01), Lutus
patent: 4733398 (1988-03-01), Shibagaki et al.
patent: 4757191 (1988-07-01), Shimada et al.
Mikrowellen Messtechnik, 1969, pp. 324-329.
"Series of Photo-Electric Elements", Catalog published by Omron Co., pp. 4-7, 10-11, 14-15.

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