Lighting systems and devices including multiple light-emitting diode units and associated methods

• US 8,829,797 B2
• Filed: 08/29/2012
• Issued: 09/09/2014
• Est. Priority Date: 08/29/2012
• Status: Active Grant

• Current Assignee: Micron Technology, Inc.
• Original Assignee: Micron Technology, Inc.
• Inventors: McMahon, Steven A.
• Primary Examiner(s): TRAN, ANH Q
• Application Number:
  US13/598,374
• Publication Number:
  US 20140062311A1
• Time in Patent Office: 741 Days
• Field of Search: None
• US Class Current: 315/154
• CPC Class Codes: H05B 45/00 Circuit arrangements for operating light-emitting diodes [LED]

Abstract

Lighting systems including lighting fixtures having multiple light-emitting diode units and associated devices, systems, and methods are disclosed herein. A lighting system configured in accordance with a particular embodiment includes a plurality of lighting fixtures individually including first and second light-emitting diode units. The system further includes a power source, first wiring operably connecting the first light-emitting diode units to the power source, and second wiring operably connecting the second light-emitting diode units to the power source. An automatic controller is operably connected to the first wiring such that the second light-emitting diode units operate independently of the automatic controller. A method for operating a lighting system in accordance with a particular embodiment includes reducing power to a first light-emitting diode unit of a lighting fixture in response to an automatically generated signal without reducing power to a second light-emitting diode unit of the lighting fixture.

Claims

1. A lighting system, comprising:

an alternating current power source;

a plurality of lighting fixtures individually including—

a first light-emitting diode unit, and

a second light-emitting diode unit;

first wiring operably connecting the first light-emitting diode units to the power source;

second wiring operably connecting the second light-emitting diode units to the power source;

an automatic controller operably connected to the first wiring;

a float-charged battery;

a battery relay operably connected to the power source, the float-charged battery, and the second wiring, the battery relay having a first state in which the battery relay operably connects the second wiring and the power source and a second state in which the battery relay operably connects the second wiring and the float-charged battery;

a first rectifier operably connected to the first wiring between the automatic controller and the first light-emitting diode units; and

a second rectifier between the power source and the battery relay,

wherein—

the first light-emitting diode units operate independently of the float-charged battery, and

the second light-emitting diode units operate independently of the automatic controller such that the second light-emitting diode unit of a given one of the lighting fixtures operate independently of the first light-emitting diode unit of the same lighting fixture.

2. The lighting system of claim 1, wherein the automatic controller includes a normally closed relay.

3. The lighting system of claim 1, further comprising a controlled-access switch operably connected to the second wiring.

4. The lighting system of claim 1, wherein the power source includes:

a load center of a building; and

shared wiring between the load center and the first and second wiring.

5. The lighting system of claim 1, wherein the automatic controller is a demand-response controller configured to receive a demand-response signal.

6. A lighting system, comprising:

a power source;

plurality of lighting fixtures individually including—

a first light-emitting unit, and

a second light-emitting diode unit;

first wiring operably connecting the first light-emitting diode units to the power source;

second wiring operably connecting the second light-emitting diode units to the power source;

a first automatic controller operably connected to the first wiring, the first automatic controller being a demand-response controller configured to receive a demand-response signal; and

a second automatic controller operably connected to the first wiring, the second automatic controller including an occupancy sensor,

wherein the second light-emitting diode units operate independently of the first and second automatic controllers such that the second light-emitting diode unit of a given one of the lighting fixtures operates independently of the first light-emitting diode unit of the same lighting fixture.

7. The lighting system of claim 6, wherein the second light-emitting diode unit of the given one of the lighting fixtures has a maximum light output less than about 25% of a maximum light output of the first light-emitting diode unit of the same lighting fixture.

8. The lighting system of claim 7, wherein:

the first light-emitting diode unit of the given one of the lighting fixtures includes a first type of light-emitting diodes individually having a first maximum light output;

the second light-emitting diode unit of the given one of the lighting fixtures includes a second type of light-emitting diodes individually having a second maximum light output; and

the second maximum light output is less than the first maximum light output.

9. The lighting system of claim 8, wherein:

the first light-emitting diode unit of the given one of the lighting fixtures includes a first quantity of light-emitting diodes;

the second light-emitting diode unit of the given one of the lighting fixtures includes a second quantity of light-emitting diodes; and

the first and second quantities are the same.

10. The lighting system of claim 8, wherein:

the first light-emitting diode unit of the given one of the lighting fixtures includes a first quantity of light-emitting diodes;

the second light-emitting diode unit of the given one of the lighting fixtures includes a second quantity of light-emitting diodes; and

the first and second quantities are different.

11. A system, comprising:

a plurality of fixtures individually including—

a first unit having a plurality of electrically coupled solid-state devices, and

a second unit having a plurality of electrically coupled solid-state devices;

a power source;

first wiring operably connecting the first units to the power source;

second wiring operably connecting the second units to the power source;

an automatic controller operably connected to the first wiring;

a battery; and

a battery relay operably connected to the power source, the battery, and the second wiring, the battery relay having a first state in which the battery relay operably connects the second wiring and the power source and a second state in which the battery relay operably connects the second wiring and the battery,

wherein—

the first units operate independently of the battery, and

the second units operate independently of the automatic controller such that the second unit of a given one of the lighting fixtures operates independently of the first unit of the same lighting fixture.

25. The system of claim 11, wherein the automatic controller includes a normally closed relay.

26. The system of claim 11, further comprising a controlled-access switch operably connected to the second wiring.

27. The system of claim 11, wherein the power source includes:

a load center of a building; and

shared wiring between the load center and the first and second wiring.

28. The system of claim 11, wherein the automatic controller includes a normally open relay.

29. The system of claim 11, wherein the automatic controller is a demand-response controller configured to receive a demand-response signal.

30. The system of claim 11, wherein the battery is a float-charged battery.

12. A lighting fixture, comprising;

a housing;

a first lighting circuit including a plurality of first light-emitting diodes;

a first lead operably connected to the first lighting circuit and accessible from an exterior of the housing;

a second lighting circuit including a plurality of second light-emitting diodes interspersed among the first light-emitting diodes;

a second lead operably connected to the second lighting circuit and accessible from the exterior of the housing; and

an automatic controller including an occupancy sensor, wherein the second lighting circuit operates independently of the automatic controller.

17. The lighting fixture of claim 12, wherein a maximum light output of the second light-emitting diodes is less than about 25% of a maximum light output of the first light-emitting diodes.

18. The lighting fixture of claim 12, further comprising a junction switch operably connected to the first and second lighting circuits, the junction switch having a first state in which the junction switch operably connects the first and second lighting circuits and a second state in which the first and second lighting circuits are electrically isolated from one another.

13. A lighting fixture, comprising:

a housing;

a first lighting circuit including a plurality of first light-emitting diodes;

a first lead operably connected to the first lighting circuit and accessible from an exterior of the housing;

a second lighting circuit including a plurality of second light-emitting diodes interspersed among the first light-emitting diodes;

a second lead operably connected to the second lighting circuit and accessible from the exterior of the housing;

an on/off switch operably connected to the second lighting circuit, the on/off switch being configured for manual operation; and

an automatic controller operably connected to the first lighting circuit,

wherein the second lighting circuit operates independently of the automatic controller.

14. A method for operating a lighting system, the method comprising:

temporarily reducing power to a first lighting-emitting diode unit in a lighting fixture in response to an automatically generated occupancy signal from an occupancy sensor; and

continuously powering a second light-emitting diode unit in the lighting fixture without reducing power to the second light-emitting diodes unit while temporarily reducing power to the first light-emitting diode unit,

wherein the first and second light-emitting diode units individually include one or more light-emitting diodes.

15. A method for operating a lighting system, the method comprising;

temporarily reducing power to a first light-emitting diode unit in a lighting fixture in response to an automatically generated signal; and

continuously powering a second light-emitting diode unit in the lighting fixture using a battery without reducing power to the second light-emitting diode unit while temporarily reducing power to the first light-emitting diode unit,

wherein the first and second light-emitting diode units individually include one or more light-emitting diodes.

19. The method of claim 15, wherein reducing power to the first light-emitting diode unit includes opening a normally closed relay.

20. The method of claim 15, wherein the automatically generated signal is a demand-response signal.

21. The method of claim 15, further comprising float charging the battery.

16. A method for operating a lighting system, the method comprising;

positioning a plurality of light fixtures proximate one or more areas to be illuminated,

the lighting fixtures individually including—

a first light-emitting diode unit,

a first lead operably connected to the first light-emitting diode unit,

a second light-emitting diode unit, and

a second lead operably connected to the second light-emitting diode unit;

operably connecting first wiring to the first leads and a power source;

operably connecting second wiring to the second leads and the power source;

operably connecting a demand-response controller to the first wiring such that the second light-emitting diode units operate independently of the demand-response controller, the demand-response controller being a first automatic controller; and

operably connecting a second automatic controller to the first wiring, the second automatic controller including an occupancy sensor.

22. The method of claim 16, wherein the plurality of lighting fixtures is a first plurality of lighting fixtures, and the method further comprises:

positioning a second plurality of lighting fixtures proximate one or more of the same or different areas to be illuminated, the second plurality of lighting fixtures individually including—

a first light-emitting diode unit,

a first lead operably connected to the first light-emitting diode unit,

a second light-emitting diode unit, and

a second lead operably connected to the second light-emitting diode unit;

operably connecting the first and second light-emitting diode units of the individual lighting fixtures of the second plurality of lighting fixtures;

operably connecting the first wiring to one of the first and second leads of the individual lighting fixtures of the second plurality of lighting fixtures; and

capping the other of the first and second leads of the individual lighting fixtures of the second plurality of lighting fixtures.

23. The method of claim 22, wherein:

positioning the first plurality of lighting fixtures includes positioning the first plurality of lighting fixtures proximate an egress area; and

positioning the second plurality of lighting fixtures includes positioning the second plurality of lighting fixtures proximate a non-egress area.

24. The method of claim 22, wherein:

the first and second lighting fixtures are the same before operably connecting the first and second light-emitting diode units of the individual lighting fixtures of the second plurality of lighting fixtures;

positioning the first and second pluralities of lighting fixtures includes positioning the first and second pluralities of lighting fixtures proximate the same area to be illuminated; and

changing a maximum light output of the second light emitting diode units by changing a quantity of the second plurality of lighting fixtures relative to a quantity of the first plurality of lighting fixtures.