Intelligent illumination device

• US 9,509,525 B2
• Filed: 07/07/2010
• Issued: 11/29/2016
• Est. Priority Date: 09/05/2008
• Status: Active Grant

• Current Assignee: Lutron Technology Company LLC
• Original Assignee: Ketra, Inc. (Lutron Electronics)
• Inventors: Knapp, David J.
• Primary Examiner(s): Vo, Tuyet
• Assistant Examiner(s): YANG, AMY X
• Application Number:
  US12/803,805
• Publication Number:
  US 20100327764A1
• Time in Patent Office: 2,337 Days
• Field of Search: 315149-250, 315/307
• US Class Current: 1/1
• CPC Class Codes: F21K 9/232 specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
• CPC Class Codes: F21K 9/238 Arrangement or mounting of circuit elements integrated in the light source
• CPC Class Codes: F21S 9/03 rechargeable by exposure to light
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G09G 3/34 by control of light from an independent source
• CPC Class Codes: H04L 12/43 with synchronous transmission, e.g. time division multiplex [TDM], slotted rings
• CPC Class Codes: H04L 12/437 Ring fault isolation or reconfiguration for SDH/SONET ring networks H04J3/085
• CPC Class Codes: H04L 2012/40273 the transportation system being a vehicle
• CPC Class Codes: H05B 45/20 Controlling the colour of the light
• CPC Class Codes: H05B 45/22 using optical feedback
• CPC Class Codes: H05B 45/3725 Switched mode power supply [SMPS]
• CPC Class Codes: H05B 47/11 by determining the brightness or colour temperature of ambient light
• CPC Class Codes: H05B 47/16 by timing means
• CPC Class Codes: H05B 47/19 via wireless transmission
• CPC Class Codes: Y02B 10/10 Photovoltaic [PV]
• CPC Class Codes: Y02B 20/40 Control techniques providing energy savings, e.g. smart controller or presence detection

Abstract

Intelligent illumination device are disclosed that use components in an LED light to perform one or more of a wide variety of desirable lighting functions for very low cost. The LEDs that produce light can be periodically turned off momentarily, for example, for a duration that the human eye cannot perceive, in order for the light to receive commands optically. The optically transmitted commands can be sent to the light, for example, using a remove control device. The illumination device can use the LEDs that are currently off to receive the data and then configure the light accordingly, or to measure light. Such light can be ambient light for a photosensor function, or light from other LEDs in the illumination device to adjust the color mix.

Claims

1. An illumination device comprising:

a light source configured to provide illumination when the illumination device is set in an on-state;

a light control circuit configured to control the light source responsive to incident light originating outside the illumination device from an external device configured to communicate with the illumination device, wherein the light control circuit is configured to control the light source by;

periodically and momentarily turning the light source off at certain times when the illumination device is set in the on-state to produce periodic gaps in the illumination, wherein each said periodic gap is produced by the illumination device at the conclusion of east one synchronization pulse;

configuring the light source to detect the incident light from the external device during the periodic gaps and when the illumination device is set to an off-state, during which the illumination device enters a low power state and is not enabled to produce illumination; and

responding to an optically modulated command conveyed within the incident light by the external device in synchronization with the at least one synchronization pulse.

2. The illumination device as recited in claim 1 wherein:

the light control circuit is responsive to the incident light during the certain times when the light source is momentarily turned off and when the illumination device is set to the off-state.

3. The illumination device as recited in claim 1 wherein:

said the light control circuit comprises a receiver block configured to demodulate the incident light to detect the optically modulated command conveyed within the incident light by the external device; and

said the receiver block is responsive to the incident light during the certain times when the light source is momentarily turned off and when the illumination device is set to the off-state.

4. The illumination device as recited in claim 1 wherein:

the light control circuit is further responsive to incident ambient light during the certain times when the light source is turned off, and wherein the light control circuit is further configured to control the light source responsive to a level of ambient light received by the illumination device.

5. The illumination device as recited in claim 1 wherein:

the light source comprises a light-emitting-diode (LED) device; and

the LED device also functions, at times, as a light sensor for the light control circuit.

6. The illumination device as recited in claim 1 further comprising a light sensor coupled to the light control circuit, said light sensor being distinct from said light source.

7. The illumination device as recited in claim 1 wherein:

the light control circuit further comprises a timer block configured to provide temporal control of the illumination device.

8. The illumination device as recited in claim 7 wherein:

the timer block cooperates to change an illumination state of the illumination device at one or more prescribed times.

9. The illumination device as recited in claim 7 wherein:

the timer block cooperates to change an illumination state of the illumination device after a controllable delay after a particular event.

10. The illumination device as recited in claim 7 wherein:

the timer block cooperates to change an illumination state of the illumination device from the on-state to an off-state after a particular delay after being set in the on-state.

11. The illumination device as recited in claim 1 further comprising:

a housing including an industry-standard base, thereby forming a backward-compatible device for use in industry-standard light sockets.

12. The illumination device as recited in claim 1 wherein, other than during the certain times, the light control circuit is configured to pulse-width-modulate the light source when the illumination device is set in the on-state.

13. The illumination device as recited in claim 12 wherein the light control circuit, in response to optically modulated command, is configured to vary the pulse-width-modulation of the light source to achieve a dimming capability.

14. The illumination device as recited in claim 1 wherein, before each of the certain times, the light control circuit is configured to modulate the light source with the at least one synchronization pulse that is detectable by the external device.

15. The illumination device as recited in claim 14 wherein the at least one synchronization pulse comprises a single pulse having a width greater than a minimum width pulse that is detectable by the external device.

54. The illumination device as recited in claim 1 further comprising a power supply block powered by an AC voltage source, wherein the power supply block is configured to provide power to the light control circuit and the light source, and wherein the certain times when the light source is turned off is synchronized to the AC voltage source.

16. The illumination device as recited in 1 wherein the light control circuit is configured to control the light source to communicate with the external device using light.

17. The illumination device as recited in 16 wherein the external device comprises a second illumination device.

18. The illumination device as recited in 16 wherein the external device comprises a remote controller.

19. The illumination device as recited in 1 wherein during the certain times, the light source is momentarily turned off for a duration of time that a human eye cannot perceive.

20. A method for operating an illumination device comprising a light source, wherein when the illumination device is set in an on-state, the method comprises:

engaging the light source at first times to provide pulse-width-modulated (PWM) illumination at a modulation frequency;

periodically and momentarily turning the light source off at second times to produce periodic gaps in the PWM illumination at a frequency less than the modulation frequency of the PWM illumination;

engaging the light source during said periodic gaps for detecting incident light originating from outside the illumination device , wherein the incident light comprises an optically modulated data command, which is conveyed by an external device;

controlling the illumination device responsive to the incident light detected by the light source, wherein the controlling step comprises;

demodulating the incident light to decode the optically modulated data command conveyed by the external device; and

changing an attribute of the illumination device in response to the data command decoded from the incident light; and

engaging the light source during third times for transmitting a response to the external device after receiving the data command.

21. The method as recited in claim 20 further comprising:

powering the illumination device using an AC voltage source; and

synchronizing the periodic gaps to a frequency of the AC voltage source.

22. The method as recited in claim 20 wherein the light source comprises a light emitting diode (LED).

23. The method as recited in claim 20 further comprising resetting the attribute by power cycling the illumination device in a prescribed sequence.

24. The method as recited in claim 20 wherein the attribute comprises a color adjustment setting of one or more light sources included within the illumination device.

25. The method as recited in claim 20 wherein the attribute comprises a change in illumination state after a controllable time delay after a particular event.

26. The method as recited in claim 25 wherein the change in illumination state comprises setting the illumination device to an off-state, and the particular event comprises said illumination device being set to the on-state by action of a user, to thereby achieve an automatic turn-off delay of the illumination device after being turned on.

27. The method as recited in claim 25 wherein the change in illumination state comprises setting the illumination device to an off-state, and the particular event comprises being set to the on-state by a particular level of ambient light received by the illumination device, to thereby achieve an automatic turn-off delay of the illumination device after being turned on.

28. The method as recited in claim 20 wherein:

the incident light originating from outside of the illumination device further comprises ambient light; and

the controlling step further comprises adjusting a brightness of the illumination device responsive to a detected amount of the ambient light.

29. The method as recited in claim 20 further comprising:

generating power from incident light received by the light source when the illumination device is set in an off state to power the illumination device or charge a battery.

30. The method as recited in claim 20 further comprising:

synchronizing the optically modulated data command to the periodic gaps produced in the illumination during said second times when the light source is momentarily turned off.

37. The method as recited in claim 20, wherein the light source comprises a first LED, and wherein the method further comprises using the first LED to detect light during said second times when the first LED is not providing illumination.

38. The method as recited in claim 37 wherein the using step comprises using the first LED to detect light emitted from a second LED included within the illumination device.

39. The method as recited in claim 38 further comprising adjusting a color of light produced by the illumination device based on the light emitted from the second LED and detected by the first LED.

40. The method as recited in claim 39 wherein the adjusting step comprises adjusting light produced by the first LED, the second LED, or both in order to adjust the color of light produced by the illumination device.

31. The method as recited in 20 wherein the incident light originating from outside of the illumination device comprises light from a second illumination device.

32. The method as recited in 20 wherein the incident light originating from outside of the illumination device comprises light from a remote controller.

33. The method as recited in 20 wherein said controlling step comprises controlling said light source to communicate with the external device.

34. The method as recited in 33 wherein the external device comprises a second illumination device.

35. The method as recited in 33 wherein the external device comprises a remote controller.

36. The method as recited in 20 wherein during the second times the light source is turned off momentarily for a duration of time that a human eye cannot perceive.

41. An illumination device system, comprising:

an illumination device comprising;

a light source configured to provide illumination when the illumination device is set in an on-state;

a light control circuit configured to control the light source, so as to provide the illumination during first times, produce periodic gaps in the illumination during second times by periodically and momentarily turning the light source off, and change an attribute of the illumination device in response to incident light received by the light source, wherein the attribute comprises a change in illumination state after a controllable time delay after a particular event, wherein before each of periodic gaps, the light control circuit is further configured to modulate the illumination provided by the light source with at least one synchronization pulse that is detectable by the remote control device; and

a remote control device configured to convey optically modulated data commands to the light source during the periodic gaps and when the illumination device is set to an off-state, during which the illumination device enters a low power state and is not enabled to produce illumination.

42. The illumination device system as recited in claim 41, wherein the remote control circuit is configured to use the at least one synchronization pulse to synchronize the optically modulated data commands to the periodic gaps.

43. The illumination device system as recited in claim 41, wherein the light control circuit is further configured to:

demodulate the incident light to decode the optically modulated data command conveyed by the remote control device; and

change an attribute of the illumination device in response to the data command decoded from the incident light.

44. The illumination device system as recited in claim 43, wherein in response to the data command decoded from the incident light, the light control circuit is configured to change the attribute of the illumination device by setting the illumination device to the on-state, setting the illumination device to the off-state, changing a brightness of light produced by the illumination device, or adjusting a color of light produced by the illumination device.

45. The illumination device system as recited in claim 41, wherein the light source is configured to receive incident light during the periodic gaps and when the illumination device is set to an off-state.

46. The illumination device system as recited in claim 45, wherein the incident light is received from another light source within the illumination device, a light source within another illumination device within the illumination device system or ambient light.

47. The illumination device system as recited in claim 45, wherein in response to the incident light received by the light source, the light control circuit is configured to change the attribute of the illumination device by setting the illumination device to the on-state, setting the illumination device to the off-state, changing a brightness of light produced by the illumination device, or adjusting a color of light produced by the illumination device.

48. The illumination device system as recited in claim 41, wherein the attribute is reset by power cycling the illumination device in a prescribed sequence.

49. An illumination device comprising:

a light source configured to provide pulse-width-modulated (PWM) illumination at a modulation frequency when the illumination device is set in an on-state; and

a light control circuit configured to control the light source responsive to incident light originating outside the illumination device from a second illumination device, which is configured to communicate with the illumination device using visible light, wherein the light control circuit is configured to turn off the light source momentarily at certain times to produce periodic gaps in the PWM illumination when the illumination device is set in the on-state, so that the light source can detect the incident light from the second illumination device during the periodic gaps, and wherein the periodic gaps are produced at a frequency less than the modulation frequency of the PWM illumination.

50. The illumination device as recited in claim 49 further comprising:

a power supply block configured for storing a voltage induced across the light source in response to receiving the incident light.

51. The illumination device as recited in claim 50 wherein the power supply block is configured to charge a battery included within the illumination device.

52. The illumination device as recited in claim 50 wherein the power supply block is configured to operate the light control circuit, when powered solely by incident light conveying optically modulated commands, to receive and decode an optically modulated command, and to configure the illumination device accordingly.

53. A method for operating an illumination device comprising a light source, wherein when the illumination device is set in an on-state, the method comprises:

engaging the light source at first times to provide pulse-width-modulated (PWM) illumination at a modulation frequency;

periodically and momentarily turning the light source off at second times to produce periodic gaps in the PWM illumination at a frequency less than the modulation frequency of the PWM illumination;

engaging the light source during said periodic gaps for detecting incident light originating from outside the illumination device, wherein the incident light comprises an optically modulated data command, which is conveyed by an external device; and

controlling the illumination device responsive to the incident light detected by the light source, wherein the controlling step comprises;

demodulating the incident light to decode the optically modulated data command conveyed by the external device; and

changing an attribute of the illumination device in response to the data command decoded from the incident light, wherein the attribute comprises a change in illumination state after a controllable time delay after a particular event.