Architectures for light emitting diode (LED) lighting systems

• US 10,098,199 B2
• Filed: 12/16/2016
• Issued: 10/09/2018
• Est. Priority Date: 08/13/2014
• Status: Active Grant

• Current Assignee: Lumenetix, Inc. (ERP Power, LLC)
• Original Assignee: Lumenetix, Inc. (ERP Power, LLC)
• Inventors: Bowers, David, Poliquin, Thomas, Cochran, Dustin, Weaver, Matthew D., Hurley, Jay, Kingman, James, Grigsby, Bryant, Ghose, Sanjoy
• Primary Examiner(s): Le, Tung X
• Application Number:
  US15/382,575
• Publication Number:
  US 20170142802A1
• Time in Patent Office: 662 Days
• Field of Search: 315307, 315312
• CPC Class Codes: H05B 45/20 Controlling the colour of the light
• CPC Class Codes: H05B 45/24 using electrical feedback from LEDs or from LED modules
• CPC Class Codes: H05B 47/16 by timing means
• CPC Class Codes: H05B 47/175 by remote control
• CPC Class Codes: H05B 47/18 via data-bus transmission
• CPC Class Codes: H05B 47/19 via wireless transmission
• CPC Class Codes: Y02B 20/40 Control techniques providing energy savings, e.g. smart controller or presence detection

Abstract

Various embodiments relate to systems and methods for controlling one or more LED-based lighting sources that are coupled to a logic module by a ribbon cable. The ribbon cable allows some or all of the processing components (e.g., processors and drivers) to be decoupled from the LED-based lighting source(s). The processing components can instead be housed within the logic module, which is able to simultaneously control the LED-based lighting source(s). Together with color models established for each LED board, the logic module acts as a platform for modularity and is able to more precisely control the color channels of each LED-based lighting source using the color models established for those LED-based lighting source(s). Techniques are also described herein that allow the logic module to utilize data stored within an erasable programmable read-only memory (EPROM) that describes the color characteristics of an LED-based lighting source.

Claims

1. A lamp control system comprising:

a logic module that includes

an interface configured to couple with a lighting source having multiple color channels,

non-volatile memory configured to store a color model,

a processor configured to compute flux ratios from the multiple color channels based on the color model, and

a control signal driver configured to send the computed flux ratios as control signals to the lighting source via the interface; and

a light emitting diode-based (LED-based) lamp that includes

an interface configured to couple with the logic module,

two or more color strings, each color string comprising one or more light emitting diodes (LEDs) of a substantially similar color,

non-volatile memory configured to store at least one spectral power density (SPD) distribution summary characterizing each color string,

an optical sensor configured to measure brightness levels of the two or more color strings, and

a processor configured to send at least a subset of the measured brightness levels and the SPD distribution summaries to the logic module via the interface.

2. The lamp control system of claim 1, wherein the logic module further includes:

a power driver configured to provide power to the LED-based lamp via the interface.

3. The lamp control system of claim 1, wherein the LED-based lamp includes a power source.

4. The lamp control system of claim 1, wherein the optical sensor of the LED-based lamp measures brightness of the two or more color strings one at a time by sequentially illuminating each color string for a specified amount of time.

5. The lamp control system of claim 1, wherein the processor of the logic module is further configured to:

detect when a brightness level of a color string of the LED-based lamp has experienced a change; and

in response to detecting the change, recalibrate a corresponding color model based on the brightness level of the color string and a corresponding SPD distribution summary.

6. A lamp control system comprising:

a driverless light emitting diode-based (LED-based) lamp that includes

one or more color strings, each color string comprising one or more light emitting diodes (LEDs) of a substantially similar color, and

an optical sensor configured to generate readings specifying a brightness level of each of the one or more color strings; and

a logic module that includes

non-volatile memory configured to store a color model,

a processor configured to determine appropriate adjustments for the driverless LED-based lamp based at least in part on the color model, the optical sensor readings, and one or more spectral power density (SPD) distribution summaries for the one or more color strings, and

a control signal driver configured to send the appropriate adjustments as control signals to the driverless LED-based lamp.

7. The lamp control system of claim 6, wherein the one or more SPD distribution summaries for the one or more color strings are stored within non-volatile memory of the driverless LED-based lamp.

8. The lamp control system of claim 7, wherein the one or more SPD distribution summaries are stored in a quantized integer format.

9. The lamp control system of claim 6, wherein the one or more SPD distribution summaries for the one or more color strings are stored within cloud-based memory that is accessible to the logic module.

10. The lamp control system of claim 6, wherein the logic module further comprises a power driver configured to provide electric current to the LED-based lamp.

11. The lamp control system of claim 10, wherein the driverless LED-based lamp distributes the electric current to the one or more color strings based on the control signals provided by the control signal driver.

12. The lamp control system of claim 6, wherein the driverless LED-based lamp includes an interface for receiving a first end of a ribbon cable, and wherein the logic module includes an interface for receiving a second end of the ribbon cable.

13. The lamp control system of claim 12, wherein the ribbon cable includes a first wire channel corresponding to a color channel in the driverless LED-based lamp and a second wire channel corresponding to a feedback channel for sending information from the driverless LED-based lamp to the logic module.

14. The lamp control system of claim 13, wherein the information includes the optical sensor readings and the one or more SPD distribution summaries that are stored within non-volatile memory of the driverless LED-based lamp.

15. The lamp control system of claim 6, wherein each SPD distribution summary characterizes a corresponding color string with tristimulus values across various operating characteristics.

16. The lamp control system of claim 15, wherein the various operating characteristics include different electric current values and different temperature values.

17. The lamp control system of claim 6, wherein each SPD distribution summary includes a thermal matrix that characterizes thermal cross-talk between adjacent light sources in a corresponding color string and capacity characteristics of the adjacent light sources in the corresponding color string.

18. The lamp control system of claim 17, wherein the thermal matrix is provided to the logic module by the driverless LED-based lamp when re-calibrating the color model.

19. The lamp control system of claim 6, wherein the color model specifies a plurality of optimized flux ratios of the one or more color strings that produce a specific correlated color temperature at a given operating temperature.

20. The lamp control system of claim 6, wherein the control signals are represented as digitized commands or as analog values represented by an electrical voltage or current.

21. A method comprising:

generating a color model for a light emitting diode-based (LED-based) lamp having multiple color strings by

creating a series of spectral power density (SPD) distribution summaries for each color string,

wherein each SPD distribution summary characterizes a particular color string at a certain set of operating conditions;

storing the series of SPD distribution summaries in a non-volatile memory of the LED-based lamp;

determining a current operating condition of the LED-based lamp;

identifying a particular SPD distribution summary corresponding to the current operating condition;

transmitting the current operating condition and the particular SPD distribution summary to a logic module coupled to the LED-based lamp;

identifying, by the logic module, a corrective adjustment for at least one of the multiple color strings based on the current operating condition and the particular SPD distribution summary;

transmitting, by the logic module, a control signal representing the corrective adjustment to the LED-based lamp.

22. The method of claim 21, wherein the series of SPD distribution summaries are stored in the non-volatile memory of the LED-based lamp in a reduced file format.

23. The method of claim 21, wherein each color string includes one or more light emitting diodes (LEDs) of a substantially similar color.

24. The method of claim 21, wherein the current operating condition specifies a temperature value, an electric current value, or both.