Low-overhead current generator for lighting circuits
First Claim
1. A lighting system comprising:
- a plurality of light emitting diode, LED, circuits;
a power source for providing a drive voltage to the plurality of LED circuits;
for each LED circuit, a first variable resistance element connected between the respective LED circuit and ground;
for each LED circuit, a first feedback circuit configured to control a voltage at a first node between the respective LED circuit and the respective first variable resistance element to a first voltage;
a current source; and
a second variable resistance element connected between the current source and ground,wherein each first variable resistance element is configured to attain a resistance value depending on a resistance value attained by the second variable resistance element.
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Accused Products
Abstract
This application relates to a lighting system comprising a plurality of light emitting diode, LED, circuits, and a power source for providing a drive voltage to the plurality of LED circuits. For each LED circuit, the lighting system comprises a first variable resistance element connected between the respective LED circuit and ground, and a first feedback circuit configured to control a voltage at a first node between the respective LED circuit and the respective first variable resistance element to a first voltage. The lighting system further comprises a current source and a second variable resistance element connected between the current source and ground, wherein each first variable resistance element is configured to attain a resistance value depending on a resistance value attained by the second variable resistance element.
20 Citations
18 Claims
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1. A lighting system comprising:
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a plurality of light emitting diode, LED, circuits; a power source for providing a drive voltage to the plurality of LED circuits; for each LED circuit, a first variable resistance element connected between the respective LED circuit and ground; for each LED circuit, a first feedback circuit configured to control a voltage at a first node between the respective LED circuit and the respective first variable resistance element to a first voltage; a current source; and a second variable resistance element connected between the current source and ground, wherein each first variable resistance element is configured to attain a resistance value depending on a resistance value attained by the second variable resistance element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification