Light emitted diode driving apparatus

Details Light emitted diode driving apparatus Light emitted diode driving apparatus

2007-09-04

2007-09-04

Lee, Benjamin C. (Department: 2612)

Communications: electrical

Visual indication

Using light emitting diodes

C340S398100, C340S815530, C340S815620, C315S291000, C315S397000, C315S311000, C345S083000, C345S084000, C345S055000

Reexamination Certificate

active

11139527

ABSTRACT:
A driving apparatus includes a DC-to-DC converter, a first LED series, a second LED series, a first constant-current circuit, a second constant-current circuit, and a feedback circuit. The DC-to-DC converter respectively outputs a direct-current voltage to one terminal of the first and the second LED series to generate a first potential and a second potential at the other terminal of the first and the second LED series according to a feedback voltage. The first and the second constant-current circuits are respectively coupled to the other terminal of the first and the second LED series and output a first current and a second current for driving the first and the second LED series according to a first and a second control signals. The feedback circuit uses the lower one of the first potential and the second potential as a feedback voltage.

REFERENCES:
patent: 6422723 (2002-07-01), Walters
patent: 6466188 (2002-10-01), Cato
patent: 6791283 (2004-09-01), Bowman et al.

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