Controlled bleeder for power supply

Details Controlled bleeder for power supply Controlled bleeder for power supply

2007-07-02

2009-10-20

Owens, Douglas W (Department: 2821)

Electric lamp and discharge devices: systems

Plural load device systems

C345S204000

Reexamination Certificate

active

07605550

ABSTRACT:
An LED backlighting system including: a control circuit; a power source; at least one LED string associated with the power source, the at least one LED string being arranged to be switchably connected to alternatively draw an illumination current from the power source and not draw an illumination current from the power source; and a controlled bleeder arranged to draw a bleed current from the power source responsive to the control circuit; the control circuit being operative to draw the bleed current from the power source via the controlled bleeder for a predetermined time period associated with the alternatively drawing and not drawing the illumination current of the at least one LED string.

REFERENCES:
patent: 6088209 (2000-07-01), Sink
patent: 6153980 (2000-11-01), Marshall et al.
patent: 6808287 (2004-10-01), Lebens et al.
patent: 6909249 (2005-06-01), Otake
patent: 2004/0066143 (2004-04-01), Ito et al.
patent: 2004/0251854 (2004-12-01), Matsuda et al.
patent: 2006/0082529 (2006-04-01), Oyama
patent: 2006/0125773 (2006-06-01), Ichikawa et al.
patent: 2006/0145636 (2006-07-01), Bacon et al.

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