Control unit and lighting apparatus including light engine and control unit
First Claim
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1. A lighting apparatus comprising:
- a light engine comprising;
a printed circuit board comprising first and second interconnection layers; and
a plurality of LED groups on said printed circuit board coupled between a power supply input and a respective one of a plurality of return paths associated with said LED group;
each of said LED groups comprising at least one LED set comprising a plurality of LEDs coupled in series in said first interconnection layer;
wherein each of the LED sets are coupled to a respective one of said plurality of return paths associated with said respective LED group in said second interconnection layer;
wherein a first one of said LED groups is comprised of at least a subset of LEDs having a first colour temperature, and a second one of said LED groups is comprised of at least a subset of LEDs having a second colour temperature different from said first colour temperature; and
a control unit coupled between said light engine and a power source having a power supply output coupled to said power supply input of said light engine and a power supply return;
wherein said control unit comprises;
a plurality of transistors, one of said plurality of transistors coupled between each of said return paths and said power supply return; and
a controller operable to selectively activate each of said transistors to allow current to flow from said power supply output through said associated LED group to said power supply return.
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Abstract
A LED based lighting apparatus is disclosed. The light engine used in the lighting apparatus may use printed circuit board and have a plurality of LED groups that are independently controllable by a control unit. The power supply input and return paths connected to each LED group may be implemented on different layers to allow a compact footprint that may be used with traditional fluorescent encasements with relatively little modification. The LEDs may comprise a subset of LEDs having a first color and a subset of LEDs having a second color different from said first color intertwined on the light engine.
190 Citations
20 Claims
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1. A lighting apparatus comprising:
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a light engine comprising;
a printed circuit board comprising first and second interconnection layers; and
a plurality of LED groups on said printed circuit board coupled between a power supply input and a respective one of a plurality of return paths associated with said LED group;
each of said LED groups comprising at least one LED set comprising a plurality of LEDs coupled in series in said first interconnection layer;
wherein each of the LED sets are coupled to a respective one of said plurality of return paths associated with said respective LED group in said second interconnection layer;
wherein a first one of said LED groups is comprised of at least a subset of LEDs having a first colour temperature, and a second one of said LED groups is comprised of at least a subset of LEDs having a second colour temperature different from said first colour temperature; anda control unit coupled between said light engine and a power source having a power supply output coupled to said power supply input of said light engine and a power supply return;
wherein said control unit comprises;
a plurality of transistors, one of said plurality of transistors coupled between each of said return paths and said power supply return; and
a controller operable to selectively activate each of said transistors to allow current to flow from said power supply output through said associated LED group to said power supply return. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A lighting apparatus comprising:
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a plurality of light engines, each of said light engines comprising;
a printed circuit board; and
a plurality of LED groups on said printed circuit board coupled between a power supply input and a respective one of a plurality of return paths associated with said LED group across said plurality of light engines;
each of said LED groups comprising at least one LED set comprising a plurality of LEDs coupled in series;
wherein a first one of said LED groups is comprised of at least a subset of LEDs having a first colour temperature, and a second one of said LED groups is comprised of at least a subset of LEDs having a second colour temperature different from said first colour temperature; anda control unit coupled between said plurality of light engines and a power source having a power supply output coupled to said power supply inputs of each of said light engines and a power supply return;
wherein said control unit comprises;
a plurality of transistors, one of said plurality of transistors coupled between each of said return paths and said power supply return; and
a controller operable to selectively activate each of said transistors to allow current to flow from said power supply output through said associated LED group on each of said plurality of light engines to said power supply return;wherein said return paths within at least one of said light engines are coupled to said transistors within said control unit via said return paths of another one of said light engines. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A lighting apparatus comprising:
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a plurality of light engines, each of said light engines comprising;
a printed circuit board; and
one or more LED groups on said printed circuit board coupled between a power supply input of said light engine and a return path associated with said LED group across said plurality of light engines;
each of said LED groups comprising at least one LED set comprising a plurality of LEDs coupled in series; anda control unit coupled between said plurality of light engines and a power source having a power supply output and a power supply return;
said power supply output being coupled to said power supply input of each of said light engines;
wherein said control unit comprises;
one or more transistors, each of said transistors coupled between one of said return paths and said power supply return; and
a controller operable to selectively activate each of said transistors to allow current to flow from said power supply output of said power source through the associated LED group on each of said plurality of light engines to said power supply return of said power source;wherein said return path within at least one of said light engines are coupled to the corresponding transistor within said control unit via the return path of another one of said light engines. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification