Apparatus, method and system for providing AC line power to lighting devices

• US 8,569,956 B2
• Filed: 10/27/2011
• Issued: 10/29/2013
• Est. Priority Date: 06/04/2009
• Status: Active Grant

• Current Assignee: Chemtron Research LLC (Intellectual Ventures LLC)
• Original Assignee: Point Somee LLC (Intellectual Ventures LLC)
• Inventors: Shteynberg, Anatoly, Zhou, Dongsheng, Dreyer, Stephen F., Ohara, Harlan, Doluca, Sinan
• Primary Examiner(s): TRAN, ANH Q
• Application Number:
  US13/283,201
• Publication Number:
  US 20120081009A1
• Time in Patent Office: 733 Days
• Field of Search: None
• US Class Current: 315/123
• CPC Class Codes: H05B 45/20 Controlling the colour of the light
• CPC Class Codes: H05B 45/36 Circuits for reducing or suppressing harmonics, ripples or electromagnetic interferences [EMI]
• CPC Class Codes: H05B 45/44 with an active control inside an LED matrix
• CPC Class Codes: H05B 45/46 having LEDs disposed in parallel lines
• CPC Class Codes: H05B 45/48 having LEDs organised in strings and incorporating parallel shunting devices
• CPC Class Codes: H05B 45/50 responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
• CPC Class Codes: H05B 45/56 involving measures to prevent abnormal temperature of the LEDs
• CPC Class Codes: H05B 45/59 for reducing or suppressing flicker or glow effects

Abstract

An apparatus, method and system are disclosed for providing AC line power to lighting devices such as light emitting diodes (“LEDs”). A representative apparatus comprises: a plurality of LEDs coupled in series to form a plurality of segments of LEDs; first and second current regulators; a current sensor; and a controller to monitor a current level through a series LED current path, and to provide for first or second segments of LEDs to be in or out of the series LED current path at different current levels. A voltage regulator is also utilized to provide a voltage during a zero-crossing interval of the AC voltage. In a representative embodiment, first and second segments of LEDs are both in the series LED current path regulated at a lower current level compared to when only the first segment of LEDs is in the series LED current path.

Claims

1. A method of providing power to a plurality of light emitting diodes couplable to receive an AC voltage, the plurality of light emitting diodes coupled in series to form a plurality of segments of light emitting diodes, each comprising one or more light emitting diodes, the method comprising:

monitoring and regulating a current level through a series light emitting diode current path;

providing for a first segment of light emitting diodes to be switched in or out of the series light emitting diode current path in response to the monitored current level at about a first predetermined current level or until the monitored current level has reached about the first predetermined current level; and

providing for a second segment of light emitting diodes to be switched in or out of the series light emitting diode current path in response to the monitored current level at about a second predetermined current level or until the monitored current level has reached about the second predetermined current level.

2. The method of claim 1, further comprising:

during a zero-crossing interval of the AC voltage, using a voltage regulator, providing a voltage or a current sufficient for a light emitting diode to be on and conducting.

3. The method of claim 2, further comprising:

during a peak interval of the AC voltage, charging the voltage regulator.

4. The method of claim 2, wherein the voltage regulator comprises a capacitor coupled to a diode.

5. The method of claim 1, further comprising:

regulating the current level of the series light emitting diode current path to be less than or equal to a maximum current level.

6. The method of claim 1, wherein said providing for the first and second segments of light emitting diodes to be switched in or out of the series light emitting diode current path further comprises:

turning off a first current regulator coupled to the first segment of light emitting diodes; and

turning on a second current regulator coupled to either the second segment of light emitting diodes or to the first segment of light emitting diodes.

7. The method of claim 6, wherein the first current regulator comprises a first current source and the second current regulator comprises a second current source.

8. The method of claim 6, further comprising:

controlling or setting the first current regulator at about the first predetermined current level; and

controlling or setting the second current regulator at about the second predetermined current level.

9. The method of claim 1, further comprising:

providing for the first, the second, or a third segment of light emitting diodes to be switched in or out of the series light emitting diode current path in response to the monitored current level at about a third predetermined current level or until the monitored current level has reached about the third predetermined current level.

10. The method of claim 9, wherein the first, second, and third predetermined current levels are incremented non-sequentially.

11. The method of claim 9, wherein said providing for the first, second, and third segments of light emitting diodes to be switched in or out of the series light emitting diode current path further comprises:

regulating the current level of the series light emitting diode current path at about the first predetermined current level or until the current level has reached about the first predetermined current level, wherein the series light emitting diode current path comprises the first segment of light emitting diodes and not the second segment of light emitting diodes;

regulating the current level of the series light emitting diode current path at about the second predetermined current level or until the current level has reached about the second predetermined current level, wherein the series light emitting diode current path comprises the second segment of light emitting diodes coupled in series to the first segment of light emitting diodes, and wherein the second predetermined current level is lower than the first predetermined current level; and

regulating the current level of the series light emitting diode current path at about the third predetermined current level or until the current level has reached about the third predetermined current level, wherein the series light emitting diode current path comprises the third segment of light emitting diodes coupled in series to the second segment of light emitting diodes coupled in series to the first segment of light emitting diodes, and wherein the third predetermined current level is greater than the first predetermined current level.

12. The method of claim 9, wherein said providing for the first, second, and third segments of light emitting diodes to be switched in or out of the series light emitting diode current path further comprises:

regulating the current level of the series light emitting diode current path at about the first predetermined current level or until the current level has reached about the first predetermined current level, wherein the series light emitting diode current path comprises the first segment of light emitting diodes and not the second segment of light emitting diodes;

regulating the current level of the series light emitting diode current path at about the second predetermined current level or until the current level has reached about the second predetermined current level, wherein the series light emitting diode current path comprises the second segment of light emitting diodes coupled in series to the first segment of light emitting diodes, and wherein the second predetermined current level is greater than the first predetermined current level; and

regulating the current level of the series light emitting diode current path at about the third predetermined current level or until the current level has reached about the third predetermined current level, wherein the series light emitting diode current path comprises the third segment of light emitting diodes coupled in series to the second segment of light emitting diodes, and wherein the third predetermined current level is greater than the second predetermined current level.

13. The method of claim 1, wherein said providing for the first and second segments of light emitting diodes to be switched in or out of the series light emitting diode current path further comprises:

regulating the current level of the series light emitting diode current path at about the first predetermined current level or until the current level has reached about the first predetermined current level, wherein the series light emitting diode current path comprises the first segment of light emitting diodes and not the second segment of light emitting diodes; and

regulating the current level of the series light emitting diode current path at about the second predetermined current level or until the current level has reached about the second predetermined current level, wherein the series light emitting diode current path comprises the second segment of light emitting diodes coupled in series to the first segment of light emitting diodes, and wherein the second predetermined current level is lower than the first predetermined current level.

14. The method of claim 1, wherein said providing for the first and second segments of light emitting diodes to be switched in or out of the series light emitting diode current path further comprises:

regulating the current level of the series light emitting diode current path at about the first predetermined current level or until the current level has reached about the first predetermined current level, wherein the series light emitting diode current path comprises the first segment of light emitting diodes and not the second segment of light emitting diodes; and

regulating the current level of the series light emitting diode current path at about the second predetermined current level or until the current level has reached about the second predetermined current level, wherein the series light emitting diode current path comprises the second segment of light emitting diodes coupled in series to the first segment of light emitting diodes, and wherein the second predetermined current level is higher than the first predetermined current level.

15. The method of claim 1, wherein said providing for the first and second segments of light emitting diodes to be switched in or out of the series light emitting diode current path further comprises:

turning off a first current regulator coupled to the first segment of light emitting diodes, wherein the first current regulator provides for a maximum current at about the first predetermined current level; and

turning on a second current regulator coupled to the second segment of light emitting diodes, wherein the second segment of light emitting diodes is coupled in series to the first segment of light emitting diodes in the series light emitting diode current path, wherein the second current regulator provides for a maximum current at the second predetermined current level, and wherein the second predetermined current level is lower than the first predetermined current level.

16. The method of claim 1, wherein said providing for the first and second segments of light emitting diodes to be switched in or out of the series light emitting diode current path further comprises:

turning off a first current regulator coupled to the first segment of light emitting diodes, wherein the first current regulator provides for a maximum current at about the first predetermined current level; and

turning on a second current regulator coupled to the second segment of light emitting diodes, wherein the second segment of light emitting diodes is coupled in series to the first segment of light emitting diodes in the series light emitting diode current path, wherein the second current regulator provides for a maximum current at the second predetermined current level, and wherein the second predetermined current level is higher than the first predetermined current level.

17. The method of claim 1, further comprising:

providing for a next segment of light emitting diodes to be switched in or out of the series light emitting diode current path in response to the monitored current level at about a next predetermined current level or until the current level has reached about the next predetermined current level.

18. The method of claim 1, wherein said providing for the first segment of light emitting diodes to be switched in or out of the series light emitting diode current path and said providing for the second segment of light emitting diodes to be switched in or out of the series light emitting diode current path occurs in a first order during a first part of an AC voltage interval and in a second order during a second part of the AC voltage interval, and wherein the second order is the reverse of the first order.

19. The method of claim 1, further comprising:

determining whether the AC voltage is phase-modulated; and

when the AC voltage is phase-modulated, providing for the first segment of light emitting diodes to be switched in or out of the series light emitting diode current path corresponding to a phase-modulated AC current level.

20. The method of claim 19, further comprising:

when the AC voltage is phase-modulated, maintaining a parallel light emitting diode current path concurrently with said providing for the second segment of light emitting diodes to be switched in or out of the series light emitting diode current path.

21. The method of claim 1, further comprising:

providing for the first segment of light emitting diodes to be switched in a first series light emitting diode current path; and

providing for the second segment of light emitting diodes to be switched in a second series light emitting diode current path in parallel with the first series light emitting diode current path.

22. The method of claim 1, further comprising:

during a first part of an AC voltage interval, providing for the first segment of light emitting diodes to be switched in a first series light emitting diode current path and providing for the second segment of light emitting diodes to be switched in a second series light emitting diode current path in parallel with the first segment of light emitting diodes;

in response to an increasing voltage level during the first part of the AC voltage interval, providing for a third segment of light emitting diodes to be switched in the first series light emitting diode current path and providing for a fourth segment of light emitting diodes to be switched in a third series light emitting diode current path in parallel with the third segment of light emitting diodes;

in response to an increasing voltage level during the first part of the AC voltage interval, providing for the second segment of light emitting diodes to be switched in the first series light emitting diode current path; and

in response to an increasing voltage level during the first part of the AC voltage interval, providing for the fourth segment of light emitting diodes to be switched in the first series light emitting diode current path.

23. The method of claim 22, further comprising:

in response to a decreasing voltage level during a second part of the AC voltage interval, providing for the fourth segment of light emitting diodes to be switched in parallel with the third segment of light emitting diodes;

in response to a decreasing voltage level during the second part of the AC voltage interval, providing for the second segment of light emitting diodes to be switched in parallel with the first segment of light emitting diodes; and

in response to a decreasing voltage level during the second part of the AC voltage interval, providing for the third and fourth segments of light emitting diodes to be switched out of the first series light emitting diode current path.

24. The method of claim 1, wherein selected segments of light emitting diodes of the plurality of segments of light emitting diodes each comprise light emitting diodes having light emission spectra of different colors or wavelengths.

25. An apparatus for providing power to a plurality of light emitting diodes couplable to receive an AC voltage, the plurality of light emitting diodes coupled in series to form a plurality of segments of light emitting diodes each comprising a light emitting diode, the apparatus couplable to a current sensor, the apparatus comprising:

a first current regulator coupled to a first segment of light emitting diodes of the plurality of segments of light emitting diodes;

a second current regulator coupled to a second segment of light emitting diodes of the plurality of segments of light emitting diodes; and

a controller coupled to the first and second current regulators and couplable to the current sensor, wherein the controller is configured to;

monitor a current level through a series light emitting diode current path;

provide for the first segment of light emitting diodes to be switched in or out of the series light emitting diode current path in response to the monitored current level at about a first predetermined current level or until the monitored current level has reached about the first predetermined current level; and

provide for the second segment of light emitting diodes to be switched in or out of the series light emitting diode current path in response to the monitored current level at about a second predetermined current level or until the monitored current level has reached about the second predetermined current level.

26. The apparatus of claim 25, further comprising:

a voltage regulator configured to provide a voltage or a current sufficient for a light emitting diode to be on and conducting during a zero-crossing interval of the AC voltage.

27. The apparatus of claim 26, wherein the voltage regulator is configured to be charged during a peak interval of the AC voltage.

28. The apparatus of claim 26, wherein the voltage regulator comprises a capacitor coupled to a diode.

29. The apparatus of claim 26, wherein the voltage regulator comprises:

a first capacitor coupled to the first or second segment of light emitting diodes;

a first diode coupled to the first capacitor;

a second capacitor coupled in series to the first diode and the first capacitor; and

a second diode coupled to the second capacitor and to the first or second segment of light emitting diodes.

30. The apparatus of claim 26, wherein the voltage regulator is coupled to either the first or the second current regulator.

31. The apparatus of claim 25, wherein the controller is further configured to regulate the current level of the series light emitting diode current path to be less than or equal to a maximum current level.

32. The apparatus of claim 25, wherein the controller is further configured to provide for the first and second segments of light emitting diodes to be switched in or out of the series light emitting diode current path by respectively turning off or on the first current regulator and turning on or off the second current regulator.

33. The apparatus of claim 25, wherein the first current regulator comprises a first current source and the second current regulator comprises a second current source.

34. The apparatus of claim 33, wherein the first current source and the second current source each comprise a transistor.

35. The apparatus of claim 33, wherein the first current source and the second current source each comprise an operational amplifier coupled to a transistor.

36. The apparatus of claim 33, wherein the first current source and the second current source each comprise an operational amplifier coupled to a plurality of transistors.

37. The apparatus of claim 25, wherein the controller is further configured to control or set the first current regulator at about the first predetermined current level and control or set the second current regulator at about the second predetermined current level.

38. The apparatus of claim 25, further comprising:

a third current regulator coupled to a third segment of light emitting diodes of the plurality of segments of light emitting diodes,

wherein the controller is further configured to provide for the first, second, or third segment of light emitting diodes to be switched in or out of the series light emitting diode current path in response to the monitored current level at about a third predetermined current level or until the monitored current level has reached about the third predetermined current level.

39. The apparatus of claim 38, wherein the first, second, and third predetermined current levels are incremented non-sequentially.

40. The apparatus of claim 38, wherein the controller is further configured to:

turn on the first current regulator to control the current level of the series light emitting diode current path at about the first predetermined current level or until the current level has reached about the first predetermined current level, wherein the series light emitting diode current path comprises the first segment of light emitting diodes and not the second segment of light emitting diodes;

turn off the first current regulator and turn on the second current regulator to control the current level of the series light emitting diode current path at about the second predetermined current level or until the current level has reached about the second predetermined current level, wherein the series light emitting diode current path comprises the second segment of light emitting diodes coupled in series to the first segment of light emitting diodes, and wherein the second predetermined current level is lower than the first predetermined current level; and

turn on the third current regulator and turn off the second current regulator to control the current level of the series light emitting diode current path at about the third predetermined current level or until the current level has reached about the third predetermined current level, wherein the series light emitting diode current path comprises the third segment of light emitting diodes coupled in series to the second segment of light emitting diodes coupled in series to the first segment of light emitting diodes, and wherein the third predetermined current level is greater than the first predetermined current level.

41. The apparatus of claim 38, wherein the controller is further configured to:

turn on the first current regulator to control the current level of the series light emitting diode current path at about the first predetermined current level or until the current level has reached about the first predetermined current level, wherein the series light emitting diode current path comprises the first segment of light emitting diodes and not the second segment of light emitting diodes;

turn off the first current regulator and turn on the second current regulator to control the current level of the series light emitting diode current path at about the second predetermined current level or until the current level has reached about the second predetermined current level, wherein the series light emitting diode current path comprises the second segment of light emitting diodes coupled in series to the first segment of light emitting diodes, and wherein the second predetermined current level is greater than the first predetermined current level; and

turn on the third current regulator and turn off the second current regulator to control the current level of the series light emitting diode current path at about the third predetermined current level or until the current level has reached about the third predetermined current level, wherein the series light emitting diode current path comprises the third segment of light emitting diodes coupled in series to the second segment of light emitting diodes coupled in series to the first segment of light emitting diodes, and wherein the third predetermined current level is greater than the second predetermined current level.

42. The apparatus of claim 25, wherein the controller is further configured to:

turn on the first current regulator to control the current level of the series light emitting diode current path at about the first predetermined current level or until the current level has reached about the first predetermined current level, wherein the series light emitting diode current path comprises the first segment of light emitting diodes and not the second segment of light emitting diodes; and

turn off the first current regulator and turn on the second current regulator to control the current level of the series light emitting diode current path at about the second predetermined current level or until the current level has reached about the second predetermined current level, wherein the series light emitting diode current path comprises the second segment of light emitting diodes coupled in series to the first segment of light emitting diodes, and wherein the second predetermined current level is lower than the first predetermined current level.

43. The apparatus of claim 25, wherein the controller is further configured to:

turn on the first current regulator to control the current level of the series light emitting diode current path at about the first predetermined current level or until the current level has reached about the first predetermined current level, wherein the series light emitting diode current path comprises the first segment of light emitting diodes and not the second segment of light emitting diodes; and

turn off the first current regulator and turn on the second current regulator to control the current level of the series light emitting diode current path at about the second predetermined current level or until the current level has reached about the second predetermined current level, wherein the series light emitting diode current path comprises the second segment of light emitting diodes coupled in series to the first segment of light emitting diodes, and wherein the second predetermined current level is greater than the first predetermined current level.

44. The apparatus of claim 25, wherein the controller is further configured to provide for a next segment of light emitting diodes to be switched in or out of the series light emitting diode current path in response to the monitored current level at about a next predetermined current level or until the monitored current level has reached about the next predetermined current level.

45. The apparatus of claim 25, wherein the controller is further configured to provide for the first segment of light emitting diodes to be switched in or out of the series light emitting diode current path and provide for the second segment of light emitting diodes to be switched in or out of the series light emitting diode current path in a first order during a first part of an AC voltage interval and in a second order during a second part of the AC voltage interval, and wherein the second order is the reverse of the first order.

46. The apparatus of claim 25, wherein the controller is further configured to:

determine whether the AC voltage is phase-modulated; and

in response to the AC voltage being phase-modulated, provide for the first segment of light emitting diodes to be switched in or out of the series light emitting diode current path corresponding to a phase-modulated AC current level.

47. The apparatus of claim 41, wherein the controller is further configured to provide for a parallel light emitting diode current path concurrently with providing for the first or second segment of light emitting diodes to be switched in or out of the series light emitting diode current path.

48. The apparatus of claim 25, wherein the controller is further configured to:

provide for the first segment of light emitting diodes to be switched in a first series light emitting diode current path; and

provide for the second segment of light emitting diodes to be switched in a second series light emitting diode current path in parallel with the first series light emitting diode current path.

49. The apparatus of claim 25, further comprising:

a rectifier couplable to receive the AC voltage.

50. The apparatus of claim 25, wherein selected segments of light emitting diodes of the plurality of segments of light emitting diodes each comprise light emitting diodes having light emission spectra of different colors or wavelengths.

51. The apparatus of claim 50, wherein the controller is further configured to selectively provide for the selected segments of light emitting diodes to be switched in or out of the series light emitting diode current path to provide a corresponding lighting effect.

52. The apparatus of claim 50, wherein the controller is further configured to selectively provide for the selected segments of light emitting diodes to be switched in or out of the series light emitting diode current path to provide a corresponding color temperature.

53. The apparatus of claim 25, wherein the apparatus is configured to operate at about a rectified AC voltage frequency selected from the group consisting of:

100 Hz, 120 Hz, 300 Hz, 360 Hz, 400 Hz, and combinations thereof.

54. The apparatus of claim 25, further comprising:

a plurality of phosphor coatings or layers, wherein each phosphor coating or layer is coupled to a corresponding light emitting diode of the plurality of light emitting diodes, and wherein each phosphor coating or layer includes a luminous decay time constant between about 2 to 3 msec.

55. The apparatus of claim 25, wherein the apparatus is couplable to a third segment of light emitting diodes of the plurality of segments of light emitting diodes and to a fourth segment of light emitting diodes of the plurality of segments of light emitting diodes, the apparatus further comprising:

a plurality of switches, wherein each switch of the plurality of switches is coupled to one of the first, second, third, or fourth segments of light emitting diodes and coupled to the controller,

wherein during a first part of an AC voltage interval, the controller is further configured to;

provide for the first segment of light emitting diodes to be switched in a first series light emitting diode current path; and

provide for the second segment of light emitting diodes to be switched in a second series light emitting diode current path in parallel with the first segment of light emitting diodes, and

wherein, in response to an increasing voltage level during the first part of the AC voltage interval, the controller is further configured to;

provide for the third segment of light emitting diodes to be switched in the first series light emitting diode current path;

provide for the fourth segment of light emitting diodes to be switched in a third series light emitting diode current path in parallel with the third segment of light emitting diodes;

provide for the second segment of light emitting diodes to be switched in the first series light emitting diode current path; and

provide for the fourth segment of light emitting diodes to be switched in the first series light emitting diode current path.

56. The apparatus of claim 55, wherein, in response to a decreasing voltage level during a second part of the AC voltage interval, the controller is further configured to:

provide for the fourth segment of light emitting diodes to be switched in parallel with the third segment of light emitting diodes;

provide for the second segment of light emitting diodes to be switched in parallel with the first segment of light emitting diodes; and

provide for the third and fourth segments of light emitting diodes to be switched out of the first series light emitting diode current path.

57. An apparatus couplable to receive an AC voltage, the apparatus comprising:

a plurality of light emitting diodes coupled in series, wherein the plurality of light emitting diodes form a segment of light emitting diodes;

a first current regulator coupled at a light emitting diode cathode of the segment of light emitting diodes;

a second current regulator coupled at a light emitting diode anode of the segment of light emitting diodes;

a current sensor;

a voltage regulator configured to provide a voltage or a current sufficient for a light emitting diode to be on and conducting; and

a controller coupled to the first and second current regulators and to the current sensor, wherein the controller is configured to;

monitor a current level through the segment of light emitting diodes;

turn on the second current regulator, wherein the second current regulator provides current through the segment of light emitting diodes, and wherein the second current regulator charges the voltage regulator; and

turn on the first current regulator, wherein the first current regulator provides current through the segment of light emitting diodes, and wherein the first current regulator discharges the voltage regulator.

58. A computer-readable storage medium having instructions stored thereon that, in response to execution by at least one computing device, cause the at least one computing device to:

monitor and regulate a current level through a series light emitting diode current path;

provide for a first segment of one or more light emitting diodes from a plurality of segments of series coupled light emitting diodes to be switched in or out of the series light emitting diode current path in response to the monitored current level at about a first predetermined current level or until the monitored current level has reached about the first predetermined current level; and

provide for a second segment of one or more light emitting diodes from the plurality of segments of series coupled light emitting diodes to be switched in or out of the series light emitting diode current path in response to the monitored current level at about a second predetermined current level or until the monitored current level has reached about the second predetermined current level.

59. The computer-readable storage medium of claim 58, wherein the instructions further cause the at least one computing device to, during a zero-crossing interval of the AC voltage, using a voltage regulator, provide a voltage or a current sufficient for a light emitting diode to be on and conducting.

60. The computer-readable storage medium of claim 59, wherein the instructions further cause the at least one computing device to, during a peak interval of the AC voltage, charge the voltage regulator.

61. The computer-readable storage medium of claim 58, wherein the instructions further cause the at least one computing device to regulate the current level of the series light emitting diode current path to be less than or equal to a maximum current level.

62. The computer-readable storage medium of claim 58, wherein the instructions further cause the at least one computing device to:

turn off a first current regulator coupled to the first segment of one or more light emitting diodes; and

turn on a second current regulator coupled to either the second segment of one or more light emitting diodes or the first segment of one or more light emitting diodes.

63. The computer-readable storage medium of claim 62, wherein the instructions further cause the at least one computing device to:

control or set the first current regulator at about the first predetermined current level; and

control or set the second current regulator at about the second predetermined current level.

64. The computer-readable storage medium of claim 58, wherein the instructions further cause the at least one computing device to provide for the first, the second, or a third segment of one or more light emitting diodes to be switched in or out of the series light emitting diode current path in response to the monitored current level at about a third predetermined current level or until the monitored current level has reached about the third predetermined current level.

65. The computer-readable storage medium of claim 64, wherein the first, second, and third predetermined current levels are incremented non-sequentially.

66. The computer-readable storage medium of claim 64, wherein the instructions further cause the at least one computing device to:

regulate the current level of the series light emitting diode current path at about the first predetermined current level or until the current level has reached about the first predetermined current level, wherein the series light emitting diode current path comprises the first segment of one or more light emitting diodes and not the second segment of one or more light emitting diodes;

regulate the current level of the series light emitting diode current path at about the second predetermined current level or until the current level has reached about the second predetermined current level, wherein the series light emitting diode current path comprises the second segment of one or more light emitting diodes coupled in series to the first segment of one or more light emitting diodes, and wherein the second predetermined current level is lower than the first predetermined current level; and

regulate the current level of the series light emitting diode current path at about the third predetermined current level or until the current level has reached about the third predetermined current level, wherein the series light emitting diode current path comprises the third segment of one or more light emitting diodes coupled in series to the second segment of one or more light emitting diodes coupled in series to the first segment of one or more light emitting diodes, and wherein the third predetermined current level is greater than the first predetermined current level.

67. The computer-readable storage medium of claim 64, wherein the instructions further cause the at least one computing device to:

regulate the current level of the series light emitting diode current path at about the first predetermined current level or until the current level has reached about the first predetermined current level, wherein the series light emitting diode current path comprises the first segment of one or more light emitting diodes and not the second segment of one or more light emitting diodes;

regulate the current level of the series light emitting diode current path at about the second predetermined current level or until the current level has reached about the second predetermined current level, wherein the series light emitting diode current path comprises the second segment of one or more light emitting diodes coupled in series to the first segment of one or more light emitting diodes, and wherein the second predetermined current level is greater than the first predetermined current level; and

regulate the current level of the series light emitting diode current path at about the third predetermined current level or until the current level has reached about the third predetermined current level, wherein the series light emitting diode current path comprises the third segment of one or more light emitting diodes coupled in series to the second segment of one or more light emitting diodes, and wherein the third predetermined current level is greater than the second predetermined current level.

68. The computer-readable storage medium of claim 58, wherein the instructions further cause the at least one computing device to:

regulate the current level of the series light emitting diode current path at about the first predetermined current level or until the current level has reached about the first predetermined current level, wherein the series light emitting diode current path comprises the first segment of one or more light emitting diodes without the second segment of one or more light emitting diodes; and

regulate the current level of the series light emitting diode current path at about the second predetermined current level or until the current level has reached about the second predetermined current level, wherein the series light emitting diode current path comprises the second segment of one or more light emitting diodes coupled in series to the first segment of one or more light emitting diodes, and wherein the second predetermined current level is lower than the first predetermined current level.

69. The computer-readable storage medium of claim 58, wherein the instructions further cause the at least one computing device to:

regulate the current level of the series light emitting diode current path at about the first predetermined current level or until the current level has reached about the first predetermined current level, wherein the series light emitting diode current path comprises the first segment of one or more light emitting diodes without the second segment of one or more light emitting diodes; and

regulate the current level of the series light emitting diode current path at about the second predetermined current level or until the current level has reached about the second predetermined current level, wherein the series light emitting diode current path comprises the second segment of one or more light emitting diodes coupled in series to the first segment of one or more light emitting diodes, and wherein the second predetermined current level is higher than the first predetermined current level.

70. The computer-readable storage medium of claim 58, wherein the instructions further cause the at least one computing device to:

turn off a first current regulator coupled to the first segment of one or more light emitting diodes, wherein the first current regulator provides for a maximum current at about the first predetermined current level; and

turn on a second current regulator coupled to the second segment of one or more light emitting diodes, wherein the second segment of one or more light emitting diodes is coupled in series to the first segment of one or more light emitting diodes in the series light emitting diode current path, wherein the second current regulator provides for a maximum current at the second predetermined current level, and wherein the second predetermined current level is lower than the first predetermined current level.

71. The computer-readable storage medium of claim 58, wherein the instructions further cause the at least one computing device to:

turn off a first current regulator coupled to the first segment of one or more light emitting diodes, wherein the first current regulator provides for a maximum current at about the first predetermined current level; and

turn on a second current regulator coupled to the second segment of one or more light emitting diodes, wherein the second segment of one or more light emitting diodes is coupled in series to the first segment of one or more light emitting diodes in the series light emitting diode current path, wherein the second current regulator provides for a maximum current at the second predetermined current level, and wherein the second predetermined current level is higher than the first predetermined current level.

72. The computer-readable storage medium of claim 58, wherein the instructions further cause the at least one computing device to provide for a next segment of light emitting diodes to be switched in or out of the series light emitting diode current path in response to the monitored current level at about a next predetermined current level or until the monitored current level has reached about the next predetermined current level.

73. The computer-readable storage medium of claim 58, wherein the instructions cause the at least one computing device to provide for the first segment of one or more light emitting diodes to be switched in or out of the series light emitting diode current path and to provide for the second segment of one or more light emitting diodes to be switched in or out of the series light emitting diode current path to occur in a first order during a first part of an AC voltage interval and in a second order during a second part of the AC voltage interval, and wherein the second order is the reverse of the first order.

74. The computer-readable storage medium of claim 58, wherein the instructions further cause the at least one computing device to:

determine whether the AC voltage is phase-modulated; and

when the AC voltage is phase-modulated, provide for the first segment of one or more light emitting diodes to be switched in or out of the series light emitting diode current path corresponding to a phase-modulated AC current level.

75. The computer-readable storage medium of claim 74, wherein the instructions further cause the at least one computing device to, when the AC voltage is phase-modulated, maintain a parallel light emitting diode current path concurrently with said providing for the second segment of one or more light emitting diodes to be switched in or out of the series light emitting diode current path.

76. The computer-readable storage medium of claim 58, wherein the instructions further cause the at least one computing device to:

provide for the first segment of one or more light emitting diodes to be switched in a first series light emitting diode current path; and

provide for the second segment of one or more light emitting diodes to be switched in a second series light emitting diode current path in parallel with the first series light emitting diode current path.

77. The computer-readable storage medium of claim 58, wherein the instructions further cause the at least one computing device to:

during a first part of an AC voltage interval, provide for the first segment of one or more light emitting diodes to be switched in a first series light emitting diode current path and providing for the second segment of one or more light emitting diodes to be switched in a second series light emitting diode current path in parallel with the first segment of one or more light emitting diodes;

in response to an increasing voltage level during the first part of the AC voltage interval, provide for a third segment of one or more light emitting diodes to be switched in the first series light emitting diode current path and providing for a fourth segment of one or more light emitting diodes to be switched in a third series light emitting diode current path in parallel with the third segment of one or more light emitting diodes;

in response to an increasing voltage level during the first part of the AC voltage interval, provide for the second segment of one or more light emitting diodes to be switched in the first series light emitting diode current path; and

in response to an increasing voltage level during the first part of the AC voltage interval, provide for the fourth segment of one or more light emitting diodes to be switched in the first series light emitting diode current path.

78. The computer-readable storage medium of claim 77, wherein the instructions further cause the at least one computing device to:

in response to a decreasing voltage level during a second part of the AC voltage interval, provide for the fourth segment of one or more light emitting diodes to be switched in parallel with the third segment of light emitting diodes;

in response to a decreasing voltage level during the second part of the AC voltage interval, provide for the second segment of one or more light emitting diodes to be switched in parallel with the first segment of light emitting diodes; and

in response to a decreasing voltage level during the second part of the AC voltage interval, provide for the third and fourth segments of one or more light emitting diodes to be switched out of the first series light emitting diode current path.

79. The computer-readable storage medium of claim 58, wherein selected segments of one or more light emitting diodes from the plurality of segments of series coupled light emitting diodes each comprise light emitting diodes having light emission spectra of different colors or wavelengths.