High intensity light-emitting diode luminaire assembly
View Patent ↗A low-cost, efficient, high intensity LED luminaire (HILL) assembly for use indoors or outdoors in wet, damp, or dry environments. In various embodiments, the HILL assembly can be powered by a universal AC or a DC electrical supply and can operate in a temperature range from about −40° C. to about +85° C. The HILL assembly can include a lens element comprising one or more concavo-convex lenses; an interchangeable LED module comprising a plurality of LEDs positioned in a LED array; and a heatsink housing containing a power supply for the LEDs. The HILL assembly can optionally comprise a circuit board for the LED array that employs thermal via technology, a lens with a frosted lip for attenuating the light source as seen from an angle, and/or a sensor for sensing an environmental parameter of interest. Driver circuitry and the LEDs are preferably mounted directly on a common circuit board.
1. A light emitting diode (LED) luminaire assembly, comprising:
a LED module comprising an array of a plurality of LEDs;
a circuit board;
a secondary lens structure comprising an array of lenses, wherein the lenses comprise concavo-convex lenses such that each lens creates wide dispersion optics, and wherein the lenses are positioned so that each LED is positioned entirely within a concave surface of a corresponding lens element lens;
a heatsink; and
driver circuitry for driving the LEDs in communication with the circuit board.
2. The LED luminaire assembly of claim 1 , wherein:
the heatsink comprises a housing that includes a plurality of channels and a plurality of mating features for that mount and provide a thermal connection of the LED module to the housing; and
the assembly further comprises:
a sealing lens that protectively encloses the LED module within the housing, and
a mounting bracket capable of multi-angle positioning of the housing.
3. The LED luminaire assembly of claim 1 , wherein:
the plurality of lenses in the secondary lens structure are formed in a plurality of modular lens matrices, and at least two of the matrices comprise different lenses.
4. The LED luminaire assembly of claim 1 , wherein the LED assembly comprises one or more gaskets and is removable from the heatsink.
5. The LED luminaire assembly of claim 1 , wherein the lenses of the secondary lens structure are integrated into a singular lens element and are comprised of plastic, acrylic, glass or polycarbonate.
6. The LED luminaire assembly of claim 1 , wherein:
the LED array comprises a plurality of parallel strings of LEDs; and
the driver circuitry is configured to provide a constant current to the LED so that voltage delivered to each string of LEDs is automatically adjusted if any LED in the string fails.
7. The LED luminaire assembly of claim 1 , wherein the driver circuitry further comprises pulse width modulation circuitry configured to enable dimming of the LEDs by varying pulse width modulation.
8. The LED luminaire assembly of claim 1 , wherein the driver circuitry further comprises feedback circuitry for balancing power input to each of a plurality of LED strings.
9. The LED luminaire assembly of claim 1 :
wherein a housing of the heatsink comprises a plurality of fins; and
the assembly further comprises an end cap that is secured to the heatsink and which includes at least one opening that is an intake for convectional cooling air into the heatsink which drives heat away from the fins of the heatsink housing.
10. The LED luminaire assembly of claim 1 , further comprising a sensor for sensing or providing data relating to the LED luminaire assembly or to environmental parameters.
11. The LED luminaire assembly of claim 1 , further comprising:
a power supply; and
a bracket body comprising at least one arm configured to support the assembly wherein the bracket body provides a cavity that holds the power supply.
12. The LED luminaire assembly of claim 1 , wherein the secondary lens structure further comprises a hexagonal lens configured to create a uniform distribution of light from the plurality of LEDs.
13. The LED luminaire assembly of claim 2 , wherein the sealing lens comprises a frosted lip for attenuating light emitted by the assembly.
14. A method of operating a LED luminaire assembly comprising a LED module comprising a plurality of LED strings each comprising a plurality of LEDs, a circuit board, a secondary lens structure comprising an array of lenses, a heatsink, and driver circuitry, the method comprising:
driving the plurality of LED strings at a constant current and varying pulse width modulation;
wherein the lenses elements of the secondary lens structure comprise concavo-convex lenses such that each lens creates wide dispersion optics, and wherein the lens elements are positioned so that each LED is positioned entirely within a concave surface of a corresponding lens.