Step down power management system for LED flashlight

Details Step down power management system for LED flashlight Step down power management system for LED flashlight

2008-07-01

2008-07-01

Tran, Thuy V. (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S224000, C315S362000

Reexamination Certificate

active

07394211

ABSTRACT:
A micro-controller and a converter circuit provide constant current to light emitting diode array from a power supply with greater voltage than the forward bias voltage of the light emitting diode. A micro-controller operatively coupled with a semiconductor switch and the converter circuit measures the ability of a DC power supply to charge the inductor. Duty cycles of the semiconductor switch are modified according to the measurement of the voltage across the internal resistor of the semiconductor switch so as to supply substantially constant current to the LED array through an inductor regardless of actual battery voltage.

REFERENCES:
patent: 4673865 (1987-06-01), DeLuca et al.
patent: 5736881 (1998-04-01), Ortiz
patent: 5739639 (1998-04-01), Johnson
patent: 6305818 (2001-10-01), Lebens et al.
patent: 6320330 (2001-11-01), Haavisto et al.
patent: 6888383 (2005-05-01), Fairbanks
patent: 7015654 (2006-03-01), Kuhlmann et al.
patent: 7071630 (2006-07-01), York
patent: 2005/0057187 (2005-03-01), Catalano

Affiliated with

Also associated with

Rating

Step down power management system for LED flashlight does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Step down power management system for LED flashlight, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Step down power management system for LED flashlight will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2784044