Controlled bleeder for power supply
First Claim
1. An LED backlighting system comprising:
- a control circuit;
a power source;
at least one LED string associated with said power source, said at least one LED string being arranged to be switchably connected to alternatively draw current from said power source and not draw current from said power source; and
a controlled bleeder arranged to draw a bleed current from said power source responsive to said control circuit, said bleed current not flowing through said at least one LED string;
said control circuit operative to draw said bleed current from said power source via said controlled bleeder for a predetermined time period when said at least one LED string is not switchably connected to draw current from said power source.
7 Assignments
0 Petitions
Accused Products
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.
33 Citations
28 Claims
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1. An LED backlighting system comprising:
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a control circuit; a power source; at least one LED string associated with said power source, said at least one LED string being arranged to be switchably connected to alternatively draw current from said power source and not draw current from said power source; and a controlled bleeder arranged to draw a bleed current from said power source responsive to said control circuit, said bleed current not flowing through said at least one LED string; said control circuit operative to draw said bleed current from said power source via said controlled bleeder for a predetermined time period when said at least one LED string is not switchably connected to draw current from said power source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for LED backlighting comprising:
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providing a power source; providing at least one LED string associated with said power source; alternatively drawing current from said power source via said provided at least one LED string and not drawing current from said power source via said provided at least one LED string; and drawing a bleed current from said power source for a predetermined time period when said provided at least one LED string is not drawing current from said power source, said drawn bleed current not flowing through said provided at least one LED string. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. An LED backlighting system comprising:
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a control circuit; a power source; at least one LED string coupled to the output of said power source, said at least one LED string being arranged to be switchably connected to alternatively draw an illumination current from said power source and not draw an illumination current from said power source; and a means for controlled bleeding of current from said power source responsive to said control circuit; said control circuit operative to draw a bleed current from said power source via said means for controlled bleeding when said at least one LED string is not drawing said illumination current from said power source, said drawn bleed current not flowing through said at least one LED string.
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Specification