Current source circuit with a photo coupler

Details Current source circuit with a photo coupler Current source circuit with a photo coupler

1984-03-23

1987-03-24

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Signal isolator

307311, G02B 2700

Patent

active

046527648

ABSTRACT:
A current source circuit contains a transistor for controlling current flowing into an electric/photo converting element in a control photo coupler so that current flowing into a photo/electric converting element in the control photo coupler is equal to a predetermined ratio of an input current from an input current source. The control photo coupler and an output photo coupler are interconnected so that the current proportional to the current flowing into the electric/photo converting circuit of the control photo coupler is fed into the electric/photo converting circuit of the output photo coupler.

REFERENCES:
patent: 3772514 (1973-11-01), Sunderland
patent: 4056719 (1977-11-01), Waaben
patent: 4228323 (1980-10-01), Feiner et al.
patent: 4313225 (1982-01-01), Carbrey et al.
Toshiba Technical Data "Photo--Couplers," Second Edition, Sep. 1982, pp. 21-26.

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