Constant current driving circuit

Details Constant current driving circuit Constant current driving circuit

1975-10-14

1978-01-10

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Plural power supplies

Plural cathode and/or anode load device

307 33, 307 60, 307297, 307304, 315307, 323 4, 340336, H05B 4300

Patent

active

040681483

ABSTRACT:
A constant current driving circuit for driving light emitting diodes, wherein a variation detecting circuit comprising a resistor and a field effect transistor is provided and the output voltage of the detecting circuit is effectively used to control the variation of electric current which flows through the driving transistor.

REFERENCES:
patent: 2876387 (1959-03-01), Doleman
patent: 2936404 (1960-05-01), Simone
patent: 3519839 (1970-07-01), Nehez
patent: 3573811 (1971-04-01), Knecht
patent: 3796951 (1974-03-01), Joseph
patent: 3875430 (1975-04-01), Prak
patent: 3878406 (1975-04-01), Beneking
patent: 3902806 (1975-09-01), Boper
patent: 4020367 (1977-04-01), Yamashiro et al.

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