Single driver for multiple light emitting diodes
AssigneeKoninklijke Philips Electronics N.V.
InventorPeng Xu
Life of this patent
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Abstract
A LED driver circuit (70, 80) employs a power source (IS, VS) for providing power at a power conversion frequency to a switching LED cell (30-32, 40-42). The switching LED cell (30-32, 40-42) switches between a radiating mode and a disabled mode at a LED driving frequency. In the radiating mode, the switching LED cell (30-32, 40-42) controls a flow of a LED current from the power source (IS, VS) through one or more LEDs (L11-LXY) to radiate a color of light from the LEDs (L11-LXY). In the disabled mode, the switching LED cell (30-32, 40-42) impedes the flow of the LED current from the power source (IS, VS) through the LEDs (L11-LXY).
Claims10
A LED driver circuit (70, 80), comprising:
- a power source (IS, VS) operable to provide power at a first frequency;
- and
- a first switching LED cell (30-32, 40-42) including a first at least one LED (L11-LXY) operable to radiate a first color of light in response to a first LED current flowing through said first at least one LED (L11-LXY),
- wherein said first switching LED cell (30-32, 40-42) is operable to be switched between a first radiating mode and a first disabled mode at a second frequency, wherein, during the first radiating mode, said first switching LED cell (30-32, 40-42) controls a flow of the first LED current from said power source (IS, VS) through said first at least one LED (L11-LXY), and
- wherein, during the first disabled mode, said first switching LED cell (30-32, 40-42) impeded a flow of the first LED current from said power source (IS, VS) through said first at least one LED (L11-LXY).
A switching LED cell (30-32, 40-42), comprising:
- an input terminal (IN1-IN6);
- an output terminal (OUT1-OUT6);
- and
- at least one LED (L11-LXY) operable to radiate a first color of light in response to a LED current flowing through said at least one LED (L11-LXY);
- and
- wherein said switching LED cell (30-32, 40-42) is operable to be switched between a radiating mode and a disabled mode at a LED driving frequency,
- wherein the radiating mode is for controlling a flow of the LED current from a power source (IS, VS) through said at least one LED (L11-LXY) whenever the power source (IS, VS) is applied between said input terminal (IN1-IN6) and said output terminal (OUT1-OUT6), and
- wherein the disabled mode is for impeding a flow of the LED current from the power source (IS, VS) through said second at least one LED (L11-LXY) whenever the power source (IS, VS) is applied between said input terminal (IN1-IN6) and said output terminal (OUT1-OUT6).
Dependencies are inferred from the claim text.