Method and system for driving light emitting elements
First Claim
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1. A method of driving a plurality of strings of light-emitting elements, the method comprising:
- providing a fixed voltage reference to a plurality of parallel-connected current sources, each of the current sources being connected in series with a string;
supplying current from each current source to the string to which it is connected, whereby the fixed voltage reference is independent of the current supplied to each string; and
taking up excess voltage not required by any one of the strings of light-emitting elements.
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Abstract
Strings of light-emitting elements are driven by providing a fixed voltage reference to a plurality of parallel-connected current sources, each of the current sources being connected in series with a string, supplying current from each current source to the string to which it is connected, whereby the fixed voltage reference is independent of the current supplied to each string, and taking up excess voltage not required by any one of the strings of light-emitting elements.
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Citations
21 Claims
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1. A method of driving a plurality of strings of light-emitting elements, the method comprising:
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providing a fixed voltage reference to a plurality of parallel-connected current sources, each of the current sources being connected in series with a string; supplying current from each current source to the string to which it is connected, whereby the fixed voltage reference is independent of the current supplied to each string; and taking up excess voltage not required by any one of the strings of light-emitting elements. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 18, 19)
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9. An illumination system comprising:
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a plurality of strings each comprising a plurality of light-emitting elements; a voltage source providing voltage to the plurality of strings; a plurality of current sources connected in parallel with each other, each current source providing current to a string of light-emitting elements; and connected to the plurality of current sources, a fixed voltage reference, different from the voltage source, for driving current from each current source through the string to which it is connected, the fixed voltage reference being independent of the current driven through each string. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 20, 21)
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Specification