Driver for light emitting device

Details Driver for light emitting device Driver for light emitting device

1996-09-13

1998-03-31

Allen, Stephone B.

Radiant energy

Photocells; circuits and apparatus

Signal isolator

250205, 327514, G02B 2700

Patent

active

057341702

ABSTRACT:
A light emitting device is operative for outputting a light beam having an intensity which increases as a drive current through the light emitting device increases. A power source is operative for supplying a drive current to the light emitting device. A control device connected to the power source and a first end of the light emitting device is operative for controlling the drive current to the light emitting device in response to an input signal. The control device has an input terminal subjected to the input signal. A photosensitive device is optically coupled to the light emitting device. A current flowing through the photosensitive device increases as an intensity of a light beam applied to the photosensitive device increases. The photosensitive device is connected between the input terminal of the control device and a second end of the light emitting device.

REFERENCES:
patent: 3772514 (1973-11-01), Sunderland
patent: 4190747 (1980-02-01), Feiner et al.
patent: 4282604 (1981-08-01), Jefferson
patent: 4652764 (1987-03-01), Nagano
patent: 4752693 (1988-06-01), Nagano
"JFET doubles isolator's bandwidth" by Hageman, EDN Electrical Design News, 33, No. 24, Nov. 24, 1988, p. 225.
"Designing isolation amplifiers with the IL 300 optocoupler" by Krause et al, Siemens Components, vol. 27, No. 5, Sep. 1, 1992, pp. 28-32.

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