AC direct drive lighting system for providing uniform light distribution
First Claim
1. An alternating current (AC) lighting system comprising:
- a first light emitting diode (LED) group including a first set of LEDs and a second set of LEDs, the first set of LEDs and the second set of LEDs being arranged in series to have a same current flowing through the first and second sets of LEDs;
a second light emitting diode group including a third set of LEDs and a fourth set of LEDs, the third set of LEDs and the fourth set of LEDs being arranged in series to have a same current flowing through the third and fourth sets of LEDs; and
the third set of LEDs being interposed between the first set of LEDs and the second set of LEDs, the second set of LEDs being interposed between the third set of LEDs and the fourth set of LEDs.
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Accused Products
Abstract
An AC lighting system for providing uniform light distribution is disclosed. According to one embodiment, the AC lighting system includes an AC driver and LED packages electrically connected to the AC driver. Each LED package includes a plurality of LED elements and is physically distributed over an illuminating surface of the AC lighting system. The AC driver has a first current sink that drives a first LED group and a second current sink that drives the first LED group and a second LED group. The first LED group includes at least one LED element from each of the LED packages, and the second LED group includes at least one LED element other that the first set of LED elements from each of the LED packages.
13 Citations
21 Claims
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1. An alternating current (AC) lighting system comprising:
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a first light emitting diode (LED) group including a first set of LEDs and a second set of LEDs, the first set of LEDs and the second set of LEDs being arranged in series to have a same current flowing through the first and second sets of LEDs; a second light emitting diode group including a third set of LEDs and a fourth set of LEDs, the third set of LEDs and the fourth set of LEDs being arranged in series to have a same current flowing through the third and fourth sets of LEDs; and the third set of LEDs being interposed between the first set of LEDs and the second set of LEDs, the second set of LEDs being interposed between the third set of LEDs and the fourth set of LEDs. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An AC lighting system comprising:
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a first light emitting diode (LED) group including a first set of LEDs and a second set of LEDs, the first set of LEDs and the second set of LEDs being arranged in series to have a same current flowing through the first and second sets of LEDs; a second light emitting diode group including a third set of LEDs and a fourth set of LEDs, the third set of LEDs and the fourth set of LEDs being arranged in series to have a same current flowing through the third and fourth sets of LEDs; a first LED package including the first and third sets of LEDs; and a second LED package including the second and fourth sets of LEDs, an LED in the first LED package being in closer proximity to another LED in the first LED package than an LED in the second LED package. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method for driving a plurality of LED groups comprising:
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providing an LED driver that is configured to control an LED current flowing through the plurality of LED groups using a plurality of current sinks, the plurality of LED groups including first and second LED groups; grouping the first LED group into first and second sets of LEDs and arranging the first and second sets of LEDs in series to have a same current flowing through the first and second sets of LEDs; and grouping the second LED group into third and fourth sets of LEDs and arranging the third and fourth sets of LEDs in series to have a same current flowing through the third and fourth sets of LEDs; interposing the third set of LEDs between the first set of LEDs and the second set of LEDs; and interposing the second set of LEDs between the third set of LEDs and the fourth set of LEDs. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification