Solid state lighting apparatuses and related methods

• US 8,970,131 B2
• Filed: 02/15/2013
• Issued: 03/03/2015
• Est. Priority Date: 02/15/2013
• Status: Active Grant

• Current Assignee: Creeled Incorporated
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: Brandes, George R., Underwood, Robert D., Keller, Bernd P.
• Primary Examiner(s): TRAN, THUY V
• Application Number:
  US13/769,273
• Publication Number:
  US 20140232288A1
• Time in Patent Office: 746 Days
• Field of Search: 362/227, 362/230, 362/231, 362/249.01, 362/249.02, 362/249.05, 362/341, 315/185.R, 315/186, 315/226, 315/291, 315/299
• US Class Current: 315/299
• CPC Class Codes: F21K 9/232 specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
• CPC Class Codes: F21V 23/005 the substrate is supporting also the light source
• CPC Class Codes: F21Y 2107/30 on the outer surface of cylindrical surfaces, e.g. rod-shaped supports having a circular or a polygonal cross section
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H05B 45/20 Controlling the colour of the light
• CPC Class Codes: H05B 45/48 having LEDs organised in strings and incorporating parallel shunting devices
• CPC Class Codes: H05B 47/10 Controlling the light source

Abstract

Solid state lighting apparatuses are adapted to operate with alternating current (AC) received directly from an AC power source. An exemplary apparatus includes a substrate and multiple sets of one or more solid state light emitters disposed over the substrate. Multiple sets of solid state light emitters are configured to be activated and/or deactivated at different times relevant to one another during portions of an AC cycle, and optionally have different duty cycles. Emitter configurations, color combinations, and/or circuit components reduce perceivable flicker, color shifts, and/or spatial variations in luminous flux. Color temperature and/or beam pattern are adjustable. Multiple emitters are arranged along non-coplanar substrate portions.

Claims

1. A solid state lighting apparatus adapted to operate with alternating current (AC) received from an AC power source, the lighting apparatus comprising:

a substrate; and

multiple sets of one or more solid state light emitters arranged on or supported by the substrate, wherein at least first and second sets of the multiple sets of solid state light emitters are configured to be activated and/or deactivated at different times relative to one another during at least a positive portion of an AC cycle, and wherein the first and second sets of the multiple sets of solid state light emitters comprise different duty cycles;

wherein at least one solid state light emitter of the first set of solid state light emitters comprises a largest duty cycle of the different duty cycles and is arranged closer in proximity to at least one solid state light emitter of the second solid state light emitter set comprising a smallest duty cycle of the different duty cycles than in proximity to any other solid state light emitter of the multiple sets of solid state light emitters.

2. The lighting apparatus according to claim 1, wherein the multiple sets of solid state light emitters comprise at least three different sets of solid state light emitters adapted to be activated and/or deactivated at different times relative to one another.

3. The lighting apparatus according to claim 1, wherein the multiple sets of solid state light emitters are configured to operate within 15 percent (%) of a root mean square (RMS) voltage of the AC power source.

4. The lighting apparatus according to claim 1, wherein each set of the multiple sets comprises at least a first solid state light emitter of a first color and at least a second solid state light emitter of a second color that is different than the first color.

5. The lighting apparatus according to claim 1, wherein a set of solid state light emitters having the smallest duty cycle of the multiple sets of solid state light emitters is disposed proximate to a center of the substrate.

6. A solid state lighting apparatus adapted to operate with alternating current (AC) received from an AC power source, the lighting apparatus comprising:

a substrate; and

an array of solid state light emitters arranged on or supported by the substrate, wherein the array includes a plurality of solid state light emitter sets each comprising multiple solid state light emitters, wherein at least two different solid state light emitter sets of the plurality of solid state light emitter sets are arranged to be activated and/or deactivated at different times relative to one another during at least a positive portion of an AC cycle;

wherein, within the array of solid state light emitters, at least one solid state light emitter of a first solid state light emitter set is arranged closer to at least one solid state emitter of a second solid state light emitter set than to any other solid state light emitter of the first solid state light emitter set.

7. The lighting apparatus according to claim 6, wherein the plurality of solid state light emitter sets comprises at least two sets having different duty cycles.

8. The lighting apparatus according to claim 6, wherein, for a majority of solid state light emitters of the first solid state light emitter set, each solid state light emitter of the majority of solid state light emitters is arranged closer to at least one solid state light emitter of the second solid state light emitter set than to any other solid state light emitter of the first solid state light emitter set.

9. The lighting apparatus according to claim 7, wherein the different duty cycles comprise a largest duty cycle and a smallest duty cycle, wherein at least a majority of solid state light emitters comprising the smallest duty cycle are arranged in a central region of the substrate, and wherein at least a majority of solid state light emitters comprising the largest duty cycle are arranged in a peripheral region of the substrate.

10. The lighting apparatus according to claim 6, embodied in a lamp, a light bulb, or a lighting fixture.

11. A solid state lighting apparatus adapted to operate with alternating current (AC) received from an AC power source, the lighting apparatus comprising:

an array of solid state light emitters arranged on or supported by a substrate, the array comprising a plurality of mutually exclusive solid state light emitter sets each comprising multiple solid state light emitters, wherein at least two different solid state light emitter sets of the plurality sets are adapted to be activated and/or deactivated at different times relative to one another during a portion of an AC cycle, and wherein the at least two different solid state light emitter sets comprise different duty cycles;

wherein the array comprises multiple solid state light emitters distributed across a central portion of the substrate, and comprises multiple solid state light emitters distributed across a peripheral portion of the substrate; and

wherein the central portion comprises more solid state light emitters than the peripheral portion.

12. The lighting apparatus according to claim 11, wherein the central portion of the substrate comprises no more than 50% of a total surface area of one face of the substrate.

13. The lighting apparatus according to claim 11, wherein a first solid state light emitter set of the at least two different solid state light emitter sets comprises a smallest duty cycle of the different duty cycles, a second solid state light emitter set of the at least two different solid state light emitter sets comprises a largest duty cycle of the different duty cycles, at least a majority of solid state light emitters of the first solid state light emitter set is disposed in the central portion of the substrate, and at least a majority of solid state light emitters of the second solid state light emitter set is disposed in the peripheral portion of substrate.

14. The lighting apparatus according to claim 11, wherein the central portion and the peripheral portion in combination comprise at least one of the following:

concentric circles, concentric squares, concentric rectangles, or other concentric polygonal shapes of the same type.

15. A lighting apparatus adapted to operate with alternating current (AC) received from an AC power source, the lighting apparatus comprising:

an array of solid state light emitters arranged on or supported by a common substrate and including a plurality of solid state light emitter sets each comprising multiple solid state light emitters, wherein at least two different solid state light emitter sets of the plurality of solid state light emitter sets are arranged to be activated and/or deactivated at different times relative to one another during at least a positive portion of an AC cycle;

wherein the array is distributed across a region of the substrate; and

wherein, for each set of the solid state light emitter sets, the multiple solid state light emitters are symmetrically arranged within or along the region.

16. A lighting apparatus according to claim 15 wherein, for each solid state light emitter set, the multiple solid state light emitters are arranged with azimuthal or rotational symmetry within or along the region.

17. The lighting apparatus according to claim 15 wherein, for each solid state light emitter set, the multiple solid state light emitters are arranged with lateral symmetry within or along the region.

18. A lighting apparatus adapted to operate with alternating current (AC) received from an AC power source, the lighting apparatus comprising:

an array of solid state light emitters arranged on or supported by a common substrate and including a plurality of solid state light emitter sets each comprising multiple solid state light emitters, wherein at least two different solid state light emitter sets of the plurality of solid state light emitter sets are arranged to be activated and/or deactivated at different times relative to one another during a portion of an AC cycle;

wherein the lighting apparatus comprises at least one of the following features (a) and (b);

(a) at least one solid state light emitter set of the plurality of solid state light emitter sets is arranged to emit at least one peak wavelength that differs by at least 30 nm from at least one peak wavelength emitted by at least one other solid state light emitter set of the plurality of solid state light emitter sets; and

(b) at least one solid state light emitter set of the plurality of solid state light emitter sets is arranged to emit a first peak wavelength and to emit a second peak wavelength that differs from the first peak wavelength by at least 30 nm.

19. The lighting apparatus according to claim 18, comprising at least one solid state light emitter set of the plurality of solid state light emitter sets adapted to emit at least one peak wavelength that differs by at least 30 nm from at least one peak wavelength emitted by at least one other solid state light emitter set of the plurality of solid state light emitter sets.

20. The lighting apparatus according to claim 18, wherein the plurality of solid state light emitter sets comprises (i) a first solid state light emitter set including a plurality of LED chips adapted to generate peak emissions in a blue range and arranged to stimulate at least one phosphor adapted to generate peak emissions in a yellow range or a green range, and (ii) a second solid state light emitter set including a plurality of LED chips adapted to generate peak emissions in an orange range or a red range.

21. The lighting apparatus according to claim 18, comprising at least one solid state light emitter set of the plurality of solid state light emitter sets arranged to emit a first peak wavelength and to emit a second peak wavelength that differs from the first peak wavelength by at least 30 nm.

22. A lighting apparatus adapted to operate with alternating current (AC) received from an AC power source, the lighting apparatus comprising:

an array of solid state light emitters arranged on or supported by a common substrate and including a plurality of solid state light emitter sets each comprising multiple solid state light emitters, wherein at least three different solid state light emitter sets of the plurality of solid state light emitter sets are arranged to be activated and/or deactivated at different times relative to one another during a portion of an AC cycle; and

wherein each solid state light emitter set of the at least three different solid state light emitter sets is independently arranged to emit light having x, y color coordinates within four MacAdam step ellipses of a reference point on the blackbody locus of a 1931 CIE Chromaticity Diagram and having a color temperature that differs by at least 400 K relative to a color temperature of each other solid state light emitter set of the at least three different solid state light emitter sets.

23. The lighting apparatus according to claim 22, wherein the at least three different solid state light emitter sets in combination are arranged to emit light having x, y color coordinates within two MacAdam step ellipses of a reference point on the blackbody locus of a 1931 CIE Chromaticity Diagram.

24. The lighting apparatus according to claim 22, comprising a control element arranged to permit adjustment of duty cycle of each solid state light emitter set of the at least three different solid state light emitter sets, and thereby permit adjustment of color temperature.

25. A lighting apparatus adapted to operate with alternating current (AC) received from an AC power source, the lighting apparatus comprising:

an array of solid state light emitters arranged on or supported by a body structure and including a plurality of solid state light emitter sets each comprising multiple solid state light emitters, wherein at least two different solid state light emitter sets of the plurality of solid state light emitter sets are arranged to be activated and/or deactivated at different times relative to one another during at least a positive portion of an AC cycle;

at least one reflector and/or at least one optical element arranged to receive emissions from the plurality of solid state light emitter sets, and arranged to affect a beam pattern generated by the lighting device; and

a control element arranged to permit adjustment of duty cycle of each solid state light emitter set of the at least two different solid state light emitter sets, and thereby permit adjustment of said beam pattern.

26. The apparatus according to claim 25, wherein the at least one reflector and/or at least one optical element comprises a first reflector or first reflector portion arranged to receive emissions from a first solid state light emitter set of the plurality of solid state light emitter sets, and comprises a second reflector or second reflector portion arranged to receive emissions from a second solid state light emitter set of the plurality of solid state light emitter sets.

27. The lighting apparatus according to claim 25, wherein the at least one reflector and/or at least one optical element comprises at least one optical element, wherein the at least one optical element comprises a first optical element portion arranged to receive emissions from a first solid state light emitter set, and wherein the at least one optical element comprises a second optical element portion arranged to receive emissions from a second solid state light emitter set.

28. A lighting apparatus adapted to operate with alternating current (AC) received from an AC power source, the lighting apparatus comprising:

a first array of solid state light emitters arranged on or supported by a first substrate and including a first plurality of solid state light emitter sets each comprising multiple solid state light emitters, wherein at least two different solid state light emitter sets of the first plurality of solid state light emitter sets are arranged to be activated and/or deactivated at different times relative to one another during a portion of an AC cycle;

a second array of solid state light emitters arranged on or supported by a second substrate and including a second plurality of solid state light emitter sets each comprising multiple solid state light emitters, wherein at least two different solid state light emitter sets of the second plurality of solid state light emitter sets are arranged to be activated and/or deactivated at different times relative to one another during a portion of an AC cycle; and

a support plate comprising a plurality of substrate mounting regions including a first substrate mounting region arranged to receive the first substrate and including a second substrate mounting region arranged to receive the second substrate.

29. The lighting apparatus according to claim 28, wherein the first substrate comprises a first circuit board, and the second substrate comprises a second circuit board.

30. The lighting apparatus according to claim 28, wherein the support plate comprises a heatsink in conductive thermal communication with the first substrate and the second substrate.

31. The lighting apparatus according to claim 28, wherein the support plate comprises a reflector arranged to reflect emissions from at least some emitters of the first array of solid state light emitters, and to reflect emissions from at least some emitters of the second array of solid state light emitters.

32. The lighting apparatus according to claim 28, wherein the first substrate mounting region comprises a first plurality of electrical conductors or contacts arranged in electrical communication with the first substrate and the first array of solid state light emitters, and the second substrate mounting region comprises a second plurality of electrical conductors or contacts arranged in electrical communication with the second substrate and the second array of solid state light emitters.

33. The lighting apparatus according to claim 28, wherein the first substrate mounting region comprises a first socket, and the second substrate mounting region comprises a second socket.

34. A solid state lighting apparatus adapted to operate with alternating current (AC) received from an AC power source, the lighting apparatus comprising:

multiple substrate regions; and

multiple sets of one or more solid state light emitters arranged on or supported by the multiple substrate regions, wherein at least first and second sets of the multiple sets of solid state light emitters are configured to be activated and/or deactivated at different times relative to one another during a portion of an AC cycle, and wherein the first and second sets of the multiple sets of solid state light emitters comprise different duty cycles;

wherein the lighting apparatus comprises at least one of the following features (i) to (iii);

(i) a first substrate region of the multiple substrate regions includes one or more solid state light emitters of the first set of solid state light emitters and includes one or more solid state light emitters of the second set of solid state light emitters; and

a second substrate region of the multiple substrate regions is non-coplanar with the first substrate region and includes one or more solid state light emitters of the first set of solid state light emitters and includes one or more solid state light emitters of the second set of solid state light emitters;

(ii) at least one first solid state light emitter of the first set of solid state light emitters is arranged on a first substrate region of the multiple substrate regions that is substantially parallel to a first plane, at least one second solid state light emitter of the second set of solid state light emitters is arranged on a second substrate region of the multiple substrate regions that is substantially parallel to a second plane that is non-coplanar with the first plane but oriented less than 30 degrees apart from the first plane, and at least a portion of emissions of the at least one first solid state emitter are arranged to mix or overlap with at least a portion of emissions of the at least one second solid state emitter; and

(iii) at least one first solid state light emitter of the first set of solid state light emitters is arranged on a first substrate region of the multiple substrate regions and is arranged to output a first beam centered in a first direction, and at least one second solid state light emitter of the second set of solid state light emitters is arranged on a second substrate region of the multiple substrate regions and is arranged to output a second beam centered in a second direction that is non-parallel to the first direction but oriented less than 30 degrees apart from the first direction.

35. The lighting apparatus according to claim 34, wherein a first substrate region of the multiple substrate regions includes one or more solid state light emitters of the first set of solid state light emitters and includes one or more solid state light emitters of the second set of solid state light emitters;

and a second substrate region of the multiple substrate regions is non-coplanar with the first substrate region and includes one or more solid state light emitters of the first set of solid state light emitters and includes one or more solid state light emitters of the second set of solid state light emitters.

36. The lighting apparatus according to claim 35, wherein the second substrate region is non-parallel to the first substrate region.

37. The lighting apparatus according to claim 34, wherein at least one first solid state light emitter of the first set of solid state light emitters is arranged on a first substrate region of the multiple substrate regions that is substantially parallel to a first plane, at least one second solid state light emitter of the second set of solid state light emitters is arranged on a second substrate region of the multiple substrate regions that is substantially parallel to a second plane that is non-coplanar with the first plane but oriented less than 30 degrees apart from the first plane, and at least a portion of emissions of the at least one first solid state emitter are arranged to mix or overlap with at least a portion of emissions of the at least one second solid state emitter.

38. The lighting apparatus according to claim 34, wherein at least one first solid state light emitter of the first set of solid state light emitters is arranged on a first substrate region of the multiple substrate regions and is arranged to output a first beam centered in a first direction, and at least one second solid state light emitter of the second set of solid state light emitters is arranged on a second substrate region of the multiple substrate regions and is arranged to output a second beam centered in a second direction that is non-parallel to the first direction but oriented less than 30 degrees apart from the first direction.

39. The lighting apparatus according to claim 34, wherein the multiple substrate regions comprise different regions of a substantially continuous substrate.

40. The lighting apparatus according to claim 34, wherein the multiple substrate regions comprise regions of different substrates.

41. The lighting apparatus according to claim 34, further comprising a globe, diffuser, or optical element arranged to transmit and/or diffuse emissions of one or more solid state light emitters of the first set of solid state light emitters and arranged to transmit and/or diffuse emissions of one or more solid state light emitters of the second set of solid state light emitter.

42. The lighting apparatus according to claim 41, wherein the globe, diffuser, or optical element is arranged to bound a cavity containing the multiple sets of one or more solid state light emitters, and wherein a plurality of conductors conducting AC power are arranged within the cavity.

43. The lighting apparatus according to claim 34, further comprising a lumiphor support element that is spatially segregated from the multiple sets of one or more solid state light emitters, and at least one lumiphor supported by the lumiphor support element, wherein the at least one lumiphor is arranged to be stimulated by emissions of at least some solid state light emitters of the multiple sets of solid state light emitters.

44. A solid state lighting apparatus adapted to operate with alternating current (AC) received from an AC power source, the lighting apparatus comprising:

a substrate; and

multiple sets of solid state light emitters, each including multiple solid state light emitters, arranged on or supported by the substrate, wherein at least first and second sets of the multiple sets of solid state light emitters are configured to be activated and/or deactivated at different times relative to one another during at least a positive portion of an AC cycle, and wherein the at least first and second sets of the multiple sets of solid state light emitters comprise different duty cycles;

wherein the lighting apparatus comprises at least one of the following features (i) and (ii);

(i) the first set of solid state light emitters comprises a largest duty cycle of the different duty cycles and consists of a greater number of solid state light emitters than any other set of the multiple sets of solid state light emitters; and

(ii) the second set of solid state light emitters comprises a smallest duty cycle of the different duty cycles and consists of a smaller number of solid state light emitters of the multiple sets of solid state light emitters.

45. The lighting apparatus according to claim 44, wherein the multiple sets of solid state light emitters includes a third set of solid state light emitters.