CIRCUITS AND METHODS FOR DRIVING LIGHT SOURCES
First Claim
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1. A printed circuit board (PCB) comprising:
- a bridge rectifier for rectifying an AC voltage to a rectified AC voltage;
a light-emitting diode (LED) light source, wherein a terminal of said LED light source receives said rectified AC voltage; and
a first switch coupled to said LED light source in series and for controlling a current through said LED light source according to a predetermined current reference, wherein said first switch is controlled linearly.
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Abstract
Embodiments in accordance with the present invention provide circuits and methods for driving light sources, e.g., a light-emitting diode (LED) light source. In one embodiment, a printed circuit board (PCB) includes a bridge rectifier rectifying an AC voltage to a rectified AC voltage, an LED light source, and a first switch coupled to the LED light source in series controlling a current through the LED light source according to a predetermined current reference. The LED light source and the first switch coupled in series receive the rectified AC voltage while the first switch is controlled linearly.
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Citations
14 Claims
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1. A printed circuit board (PCB) comprising:
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a bridge rectifier for rectifying an AC voltage to a rectified AC voltage; a light-emitting diode (LED) light source, wherein a terminal of said LED light source receives said rectified AC voltage; and a first switch coupled to said LED light source in series and for controlling a current through said LED light source according to a predetermined current reference, wherein said first switch is controlled linearly. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification