Current control circuit for light emitting diode

Details Current control circuit for light emitting diode Current control circuit for light emitting diode

1977-08-11

1979-07-10

La Roche, Eugene R.

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

307251, 307297, 323 22T, 340333, G05F 156, H05B 4300

Patent

active

041609344

ABSTRACT:
The current in a semiconductive light emitting diode (LED), driven by an insulated gate field effect transistor (IGFET) switch, is stabilized by a current control circuit including a comparator type feedback network, which stabilizes the voltage at a node located between said switch and the series connection of a ballast resistor and the LED.

REFERENCES:
patent: 3736522 (1973-05-01), Padgett
patent: 3925690 (1975-12-01), Spence
patent: 3955103 (1976-05-01), Russell et al.
patent: 4017847 (1977-04-01), Burford et al.

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