Automatically adjusting drive circuit for light emitting diode

Details Automatically adjusting drive circuit for light emitting diode Automatically adjusting drive circuit for light emitting diode

1993-05-03

1994-09-06

Stephan, Steven L.

Electricity: power supply or regulation systems

External or operator controlled

Using a three or more terminal semiconductive device as the...

323902, G05F 156, G05B 2402

Patent

active

053451678

ABSTRACT:
A light emitting diode driving circuit for supplying a driving pulse to a light emitting diode to thereby cause the light emitting diode to intermittently emit light is disclosed which comprises a clamping circuit, a photodiode disposed in the vicinity of the light emitting diode for detecting the optical output power of the light emitting diode, an AC amplifier having its DC operating point stabilized by means of a DC feedback circuit for AC amplifying the detected output from the photodiode, a shaping circuit for shaping the output amplified signal from the AC amplifier, and a comparison circuit for comparing for voltage the output shaped signal from the shaping circuit and a reference voltage, in which the clamping voltage of the clamping circuit is controlled by the output of the comparison circuit and, thereby, the optical output power of the light emitting diode is maintained constant.

REFERENCES:
patent: 3188493 (1965-06-01), Malagari
patent: 3243604 (1966-03-01), Johnson
patent: 3952242 (1976-04-01), Ukai
patent: 4179666 (1979-12-01), Lindenborg
patent: 4190795 (1980-02-01), Schultheis
patent: 4203032 (1980-05-01), Haunstetter et al.
patent: 4395660 (1983-07-01), Waszkiewicz
patent: 4716285 (1987-12-01), Konishi
patent: 4733398 (1988-03-01), Shibagaki et al.
patent: 4998043 (1991-03-01), Unami et al.
patent: 5144117 (1992-09-01), Hasegawa et al.

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