Illumination device, system and method for manually adjusting automated periodic changes in emulation output

• US 10,237,945 B2
• Filed: 09/14/2016
• Issued: 03/19/2019
• Est. Priority Date: 09/14/2016
• Status: Active Grant

• Current Assignee: Lutron Technology Company LLC
• Original Assignee: Lutron Ketra LLC (Lutron Electronics)
• Inventors: Sooch, Nav, Ho, Horace C., Frank, Rebecca, Lewis, Jason E., Bocock, Ryan Matthew
• Primary Examiner(s): Le, Tung X
• Assistant Examiner(s): Luong, Henry
• Application Number:
  US15/264,775
• Publication Number:
  US 20180077770A1
• Time in Patent Office: 916 Days
• CPC Class Codes: H05B 45/20 Controlling the colour of the light

Abstract

An illumination device, system and method are provided herein for emulating sunlight along a daytime or nighttime locus. Sunlight is emulated depending on the path length of the sun relative to a structure containing the illumination device and system. One or more illumination devices can be grouped together and perform the sunlight emulation along the locus by producing different color temperatures throughout the day by all illumination devices within that group producing the same color temperature changes throughout the day. Moreover, a particular advantage of the preferred embodiments is the ability to manually change at any time the emulated natural sunlight output from the one or more groups of illumination devices and advantageously change the color output more so at certain times than at other times by simply actuating a trigger on a dimmer associated with a virtual or physical keypad.

Claims

1. An illumination device, comprising:

a plurality of light emitting diode (LED) chains, each of the plurality of LED chains is configured to produce illumination for the illumination device at a chromaticity consistent with a chromaticity setting;

a driver circuit coupled to the plurality of LED chains that automatically changes a color temperature output from the illumination device as a function of a time of day;

a control module coupled to the driver circuit for sending a brightness value to the driver circuit, said control module comprising;

an interface coupled to receive an intensity value;

a storage medium comprising a non-linear first mapping of the intensity value to the brightness value, and a second mapping of a color temperature as the function of the time of day; and

a controller coupled to receive a change in the intensity value from the interface and to fetch the non-linear first mapping and the second mapping from the storage medium to produce a greater change in the color temperature nearer sunrise or sunset than during noontime, even though the brightness change resulting from the intensity value is equal at sunrise, sunset and noontime.

2. The illumination device as recited in claim 1, wherein each of said plurality of LED chains is configured to produce a spectral wavelength range.

3. The illumination device as recited in claim 1, wherein the driver circuit automatically changes the color temperature by applying different drive currents to each of the plurality of LED chains as the function of the time of day.

4. The illumination device as recited in claim 3, wherein the different drive currents to each of the plurality of LED chains automatically changes as the function of the time of day to change the color temperature output to emulate changes in a natural light of the sun.

5. The illumination device as recited in claim 3, wherein the different drive currents to each of the plurality of LED chains automatically changes depending on a position of the sun.

6. The illumination device as recited in claim 1, wherein the interface comprises a wire or wireless interface for receiving the change in the intensity value when a user actuates a button or slider on a remote controller wired or wirelessly coupled to the interface.

7. The illumination device as recited in claim 1, further comprising a dimmer coupled to the controller to forward the change in the intensity value from the dimmer when a user actuates a button or slider on the dimmer.

8. An illumination system, comprising:

a plurality of light emitting diodes (LEDs) configured to produce a plurality of color temperatures along a black body curve;

a timer for producing a plurality of times of day, comprising a first time of day at sunrise or sunset and a second time of day at noontime;

a driver circuit coupled between the timer and the plurality of LEDs to receive the plurality of times of day and to send a drive current to the plurality of LEDs to produce a first color temperature during the first time of day and a second color temperature during the second time of day, wherein the timer is remote from the driver circuit and wirelessly or over a wired connection forwards the plurality of times of day to the driver circuit as well as a control module, each of the plurality of times of day having a different time value from others of the plurality of times of day;

a remote controller coupled to produce an intensity value;

the control module coupled between the remote controller and the driver circuit for receiving the intensity value and sending a brightness value having a non-linear correspondence with the intensity value to each of the plurality of LEDs, said control module comprising;

a storage medium comprising a non-linear first mapping of the intensity value to the brightness value, and a second mapping of the color temperature as a function of the time of day; and

a controller coupled to receive a change in the intensity value from the remote controller, fetch the non-linear first mapping and the second mapping from the storage medium, and produce a greater change in the color temperature during the first time of day than during the second time of day even though the brightness change resulting from the intensity value is equal at both the first time of day and the second time of day.

9. The illumination system as recited in claim 8, wherein the timer comprises a real time clock that changes depending on a position of earth at which the remote controller resides, and the plurality of times of day produced from the timer comprises a regular timed interval.

10. The illumination system as recited in claim 8, wherein the plurality of times of day are values that change depending on the a position of sun relative to where the timer is on earth.

11. The illumination system as recited in claim 8, further comprising a dimmer coupled to AC mains and comprises a trigger that when actuated by a user changes the intensity value produced from the dimmer and which correspondingly changes the brightness value non-linearly and, depending upon the time of day, changes the color temperature differing amounts.

12. The illumination system as recited in claim 11, wherein the trigger of the dimmer, when actuated by a user, reduces the intensity value and the brightness value, causing the color temperature to decrease more during an hour after sunrise and an hour before sunset than times therebetween.

13. The illumination system as recited in claim 8, further comprising a dimmer coupled to AC mains and comprises a trigger that when actuated by a user changes the intensity value produced from the dimmer and which corresponding changes the brightness value equally among the plurality of LEDs and, depending upon the time of day, changes the color temperature differing amounts.

14. The illumination system as recited in claim 8, the remote controller comprises a trigger that when actuated by a user changes the color temperature more an hour after sunrise and an hour before sunset than during an interim therebetween.

15. A method for illuminating a structure, comprising:

producing a color temperature among a plurality of light emitting diode (LED) illumination devices within the structure;

automatically changing the color temperature among the plurality of LED illumination devices based on periodic, differing time of day signals sent from a timer remote from the plurality of LED illumination devices to emulate changing natural light produced by sun;

receiving a change in intensity value;

in response to receiving the change in intensity value, fetching a first mapping of the intensity value to a brightness value and a second mapping of the color temperature as a function of time of day; and

producing a greater change in the color temperature during a first time of day than during a second time of day even though the brightness change resulting from the intensity value is equal at both the first time of day and the second time of day.

16. The method as recited in claim 15, wherein said producing comprises forwarding a drive current to each of a plurality of light emitting diode (LED) chains within each of the plurality of LED illumination devices to produce a mixture of chromaticity values along a black body curve of color temperatures.

17. The method as recited in claim 15, wherein receiving a change in the intensity value comprises detecting an actuation of a button or slider on a remote controller to decrease an intensity value of the plurality of LED illumination devices.

18. The method as recited in claim 15, wherein the first time of day comprises a time near sunrise or sunset and the second time of day comprises a time near noontime.