LED power supply with options for dimming
First Claim
1. A LED string driver circuit consisting of:
- A. A universal AC input;
B. A single stage power converter that converts power provided by the universal AC input to regulated DC current in the LED string;
C. A LED light source directly connected to the single stage power converter;
D. A power factor correction unit that controls current provided by the single stage power converter;
E. A galvanic isolation barrier;
F. An input section directly connected to the AC input; and
G. An output section that is directly connected to and powers the LED light source and is galvanically isolated from the input section by a galvanic isolation barrier.
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Abstract
A LED driver circuit is disclosed that has the ability to drive a single series string of power LEDs. The LED driver circuit uses a single stage power converter to convert from a universal AC input to a regulated DC current. This single stage power converter current is controlled by a power factor correction unit. Furthermore, the LED driver circuit contains a galvanic isolation barrier that isolates an input, or primary, section from an output, or secondary, section. The LED driver circuit can also include a dimming function, a red, green, blue output function, and a control signal that indicates the LED current and is sent from the secondary to the primary side of the galvanic barrier.
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Citations
20 Claims
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1. A LED string driver circuit consisting of:
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A. A universal AC input;
B. A single stage power converter that converts power provided by the universal AC input to regulated DC current in the LED string;
C. A LED light source directly connected to the single stage power converter;
D. A power factor correction unit that controls current provided by the single stage power converter;
E. A galvanic isolation barrier;
F. An input section directly connected to the AC input; and
G. An output section that is directly connected to and powers the LED light source and is galvanically isolated from the input section by a galvanic isolation barrier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification