LED drive circuit, LED lighting device, and backlight

Details LED drive circuit, LED lighting device, and backlight LED drive circuit, LED lighting device, and backlight

2006-04-27

2008-08-05

Philogene, Haissa (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S169100, C315S312000, C315S276000, C327S108000, C327S109000, C345S046000, C345S082000

Reexamination Certificate

active

07408308

ABSTRACT:
To realize an LED drive circuit capable of feeding equal currents to parallel-connected LED circuits with a simple arrangement, there are provided a current source generating a temporally altering current and a first smoothing capacitor and a second smoothing capacitor, and there are also provided: a first LED circuit, containing one LED or series-connected LEDs, which is connected in parallel with the first smoothing capacitor; and a second LED circuit, containing one LED or series-connected LEDs, which is connected in parallel with the second smoothing capacitor, the drive circuit comprising: a current-dividing coil containing two coils coupled at a tap so that the current generated in the current source flows into the tap; a first reverse current blocking diode connected between an end of the current-dividing coil and an electrode of the first smoothing capacitor; and a second reverse current blocking diode connected between another end of the current-dividing coil and an electrode of the second smoothing capacitor.

REFERENCES:
patent: 4298869 (1981-11-01), Okuno
patent: 6057651 (2000-05-01), Usami et al.
patent: 6870328 (2005-03-01), Tanabe et al.
patent: 7115888 (2006-10-01), Hachiya et al.
patent: 2004/0155596 (2004-08-01), Ushijima et al.
patent: 2007/0121349 (2007-05-01), Mednik et al.
patent: 56-86495 (1981-07-01), None
patent: 59-108297 (1984-06-01), None
patent: 8-194448 (1996-07-01), None
patent: 11-67471 (1999-03-01), None
patent: 2000-12907 (2000-01-01), None
patent: 2002-8409 (2002-01-01), None
patent: 2004-51014 (2004-02-01), None
patent: 2004-253364 (2004-09-01), None
patent: 2004-319583 (2004-11-01), None
patent: 2004-335443 (2004-11-01), None
patent: WO-2004/068909 (2004-08-01), None

Affiliated with

Also associated with

Rating

LED drive circuit, LED lighting device, and backlight does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with LED drive circuit, LED lighting device, and backlight, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and LED drive circuit, LED lighting device, and backlight will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4014445