Lighting fixture that self-estimates its power usage and monitors its health

• US 8,890,418 B2
• Filed: 01/06/2013
• Issued: 11/18/2014
• Est. Priority Date: 02/04/2012
• Status: Active Grant

• Current Assignee: Building Robotics, Inc. (Siemens AG)
• Original Assignee: Enlighted, Inc. (Siemens AG)
• Inventors: Mohan, Tanuj, Gentry, Zachary
• Primary Examiner(s): WHITE, DYLAN C
• Application Number:
  US13/735,007
• Publication Number:
  US 20130200807A1
• Time in Patent Office: 681 Days
• Field of Search: 315/151, 325/205, 314/64
• US Class Current: 315/151
• CPC Class Codes: H05B 47/10 Controlling the light source
• CPC Class Codes: H05B 47/11 by determining the brightness or colour temperature of ambient light
• CPC Class Codes: H05B 47/22 with communication between the lamps and a central unit
• CPC Class Codes: Y02B 20/40 Control techniques providing energy savings, e.g. smart controller or presence detection

Abstract

Apparatuses, methods and systems for lighting fixture determining its power usage and monitoring its operational health are disclosed. One embodiment includes a method of a lighting fixture determining its power usage. The method includes sensing, by an ambient light sensor, an intensity of light emitted from the lighting fixture, and estimating power usage of the lighting fixture based on the sensed intensity of light.

Claims

1. A lighting fixture, comprising:

a light;

a light intensity controller connected to the light for controlling an intensity of light emitted from the light;

an ambient light sensor for sensing the intensity of light emitted from the light;

a controller, wherein at least one of the controller or an external controller is operative to estimate a power usage of the lighting fixture based on the sensed intensity of light;

wherein the lighting fixture and a plurality of other light fixtures report their monitored behavior to a managing controller; and

wherein the managing controller turns off or on at least some of the other light fixtures that are determined to be neighbors of the light fixture, actively adjusts a dimming control applied to the light, and monitors the intensity of light emitted from the light that results, thereby allowing the managing controller to determine whether the lighting fixture is operating properly.

2. The lighting fixture of claim 1, wherein at least one of the controller or the external controller is operative to monitor operational health of the lighting fixture, comprising adjusting a dimming control applied to the light by greater than a threshold, and monitoring the sensed intensity of light emitted from the light.

3. The lighting fixture of claim 1, further comprising the managing controller actively testing the lighting fixture to determine proper operation of the lighting fixture.

4. The lighting fixture of claim 1, wherein at least one of the controller or the external controller is further operative to monitor operational health of the lighting fixture, comprising passively monitoring a dimming control applied to the light and monitoring a sensed intensity of light emitted from the light.

5. The lighting fixture of claim 1, wherein the power usage of the light is estimated by referencing a known relationship between the power usage and the intensity of light of the light of the lighting fixture, and the sensed emitted light.

6. The lighting fixture of claim 1, wherein at least one of the controller or the external controller is further operative to confirm the estimated power usage by referencing a known relationship between the power usage and a dimming control applied to a light of the lighting fixture.

7. The lighting fixture of claim 6, wherein the confirming power usage is determined based on the known relationship between the power usage and the dimming control applied to the light of the lighting fixture, and an actual dimming control applied to the light.

8. The lighting fixture of claim 1, wherein at least one of the controller or the external controller is further operative to predict an end of life of a light of the lighting fixture by referencing a known relationship of emitted light intensity of the light over time.

9. A lighting fixture, comprising:

a light;

a light intensity controller connected to the light for controlling an intensity of light emitted from the light;

an ambient light sensor for sensing the intensity of light emitted from the light;

a controller, wherein at least one of the controller or an external controller is operative to estimate a power usage of the lighting fixture based on the sensed intensity of light;

wherein at least one of the controller or the external controller is further operative to monitor operational health of the lighting fixture, comprising passively monitoring a dimming control applied to the light and monitoring a sensed intensity of light emitted from the light;

wherein at least one of the controller or the external controller is further operative to poll neighboring light fixtures to aid in determination of a condition of the light fixture if the light fixture fails a passive monitoring test.

10. A lighting fixture, comprising:

a light;

a light intensity controller connected to the light for controlling an intensity of light emitted from the light;

an ambient light sensor for sensing the intensity of light emitted from the light;

a controller, wherein at least one of the controller or an external controller is operative to estimate a power usage of the lighting fixture based on the sensed intensity of light;

wherein at least one of the controller or the external controller is further operative to monitor operational health of the lighting fixture, comprising passively monitoring a dimming control applied to the light and monitoring a sensed intensity of light emitted from the light;

wherein at least one of the controller or the external controller is further operative to initiate an active monitoring test if the light fixture fails a passive monitoring test.

11. A lighting fixture, comprising:

a light;

a light intensity controller connected to the light for controlling an intensity of light emitted from the light;

an ambient light sensor for sensing the intensity of light emitted from the light;

a controller, wherein at least one of the controller or an external controller is operative to estimate a power usage of the lighting fixture based on the sensed intensity of light;

wherein at least one of the controller or the external controller is further operative to generate a reference lighting intensity change by at least one of turning the light of the lighting fixture off or on, and then the ambient light sensor sensing a light level change when the light is at least one of turned off or on.

12. A lighting fixture, comprising:

a light;

a light intensity controller connected to the light for controlling an intensity of light emitted from the light;

an ambient light sensor for sensing the intensity of light emitted from the light;

a controller, wherein at least one of the controller or an external controller is operative to estimate a power usage of the lighting fixture based on the sensed intensity of light;

wherein at least one of the controller or the external controller is further operative to determine a baseline representation of an on and off state of the light and resulting sensed intensity of light at installation, and compare the baseline representation with later obtained representations of on and off states of the light and resulting sensed intensity of light.

13. The lighting fixture of claim 12, wherein if a gradual degradation of sensed intensity of light is observed, at least one of the controller or the external controller deducing that the light is aging, and if a sudden degradation of sense light intensity of the light is observed, then at least one of the controller or the external controller deducing that at least one sub-light of a plurality of sub-lights of the light is non-operational.

14. The lighting fixture of claim 12, wherein at least one of the controller or the external controller is further operative to predict an end of life of a light of the lighting fixture by detecting a significant drop in light intensity with reference to the baseline emitted light intensity.

15. A lighting fixture, comprising:

a light;

a light intensity controller connected to the light for controlling an intensity of light emitted from the light;

an ambient light sensor for sensing the intensity of light emitted from the light;

a controller, wherein at least one of the controller or an external controller is operative to estimate a power usage of the lighting fixture based on the sensed intensity of light;

wherein at least one of the controller or the external controller is further operative to determine a baseline representation of dimming control voltage applied to the light and resulting sensed intensity of light at installation, and compare the baseline representation with later obtained representations of dimming control voltage applied to the light and resulting sensed intensity of light.

16. The lighting fixture of claim 15, wherein if a gradual degradation of sensed intensity of light is observed, at least one of the controller or the external controller deducing that the light is aging, and if a sudden degradation of sense light intensity of the light is observed, then at least one of the controller or the external controller deducing that at least one sub-light of a plurality of sub-lights of the light is non-operational.

17. The lighting fixture of claim 15, wherein at least one of the controller or the external controller is further operative to predict an end of life of a light of the lighting fixture by detecting a significant drop in light intensity with reference to the baseline emitted light intensity.

18. A method of a lighting fixture determining its power usage, comprising:

sensing, by an ambient light sensor, an intensity of light emitted from the lighting fixture;

estimating power usage of the lighting fixture based on the sensed intensity of light

wherein the lighting fixture and a plurality of other light fixtures report their monitored behavior to a managing controller; and

wherein the managing controller turns off or on at least some of the other light fixtures that are determined to be neighbors of the light fixture, actively adjusts a dimming control applied to the light, and monitors the intensity of light emitted from the light that results, thereby allowing the managing controller to determine whether the lighting fixture is operating properly.

19. The lighting method of claim 18, further comprising monitoring operational health of the lighting fixture, comprising adjusting a dimming control applied to the light by greater than a voltage threshold, and monitoring the sensed intensity of light emitted from the light.

20. The method of claim 18, wherein the power usage of the light fixture is estimated by referencing a known relationship between the power usage and the emitted light of a light of the lighting fixture, and the sensed emitted light.

21. The method of claim 18, further comprising generating a reference lighting intensity by at least one of turning the light of the lighting fixture off or on, and then the ambient light sensor sensing a light level when the light is at least one of turned off or on.