Extended life LED fixture

• US 7,839,295 B2
• Filed: 10/09/2007
• Issued: 11/23/2010
• Est. Priority Date: 10/09/2007
• Status: Active Grant

• Current Assignee: ABL IP Holding LLC (Acuity Brands, Inc.)
• Original Assignee: ABL IP Holding LLC (Acuity Brands, Inc.)
• Inventors: Ries, Jack Leighton II
• Primary Examiner(s): Crosland; Donnie L
• Application Number:
  US11/869,562
• Publication Number:
  US 20090091467A1
• Time in Patent Office: 1,141 Days
• Field of Search: 340/815.45, 362/800
• US Class Current: 340/815.45
• CPC Class Codes: H05B 45/30 Driver circuits
• CPC Class Codes: H05B 47/155 Coordinated control of two or more light sources
• CPC Class Codes: H05B 47/29 Circuits providing for substitution of the light source in case of its failure
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

An LED fixture includes multiple LED drivers and multiple LED lamps so that the lifetime of the fixture is a multiple of the lifetime of a conventional fixture that uses only a single LED driver. A distributed controller activates and deactivates the LED drivers so that the different LED lamps are driven sequentially. An optional multi-lamp LED driver concurrently drives multiple LED lamps that have been previously driven by the LED drivers.

Claims

1. An LED driver, comprising:

circuitry for driving an LED lamp, wherein the LED lamp includes a plurality of LEDs; and

a controller for activating and deactivating the circuitry, wherein the controller monitors an operating parameter of the LED driver and once the operating parameter of the LED driver satisfies a predetermined value, then the controller deactivates the circuitry and sends a signal to a second LED driver that causes the second LED driver to activate a second LED lamp associated with the second LED driver,

wherein the LED driver, the second LED driver, the LED lamp and the second LED lamp are within a single light fixture.

2. The LED driver of claim 1, wherein the operating parameter is operating time and the predetermined value is based on a selection from the group consisting of:

expected operating life of the LED driver, expected operating life of the LED lamp, and expected lumen depreciation of the LED lamp.

3. The LED driver of claim 1, wherein the operating parameter corresponds to an output of the LED driver and the predetermined value is based on a selection from the group consisting of:

a value that indicates a failure of the LED driver and a value that indicates a performance degradation of the LED driver.

4. The LED driver of claim 1, wherein the operating parameter corresponds to an output of the LED driver and is selected from the group consisting of:

output current, output voltage, output power.

5. The LED driver of claim 1, wherein the signal is a power signal.

6. The LED driver of claim 1, wherein the single light fixture includes a previous LED driver and wherein in response to receiving a signal from the previous LED driver, the controller activates the circuitry for driving the LED lamp.

7. A single light fixture, comprising:

a plurality of LED drivers, wherein each LED driver includes a controller and at least one of the LED drivers is connected to at least one other LED driver; and

a plurality of LED lamps, wherein each LED lamp includes a plurality of LEDs and each LED lamp is connected to a distinct LED driver;

wherein each of the controllers of the at least one LED driver is operable to;

in response to a received signal, activate its corresponding LED driver so that the LED lamp associated with the LED driver is activated;

monitor an operating parameter of the LED driver to determine when the operating parameter satisfies a predetermined value; and

once the LED driver satisfies the predetermined value, deactivate the LED driver so that the LED lamp associated with the LED driver is deactivated and transmit a signal to the other LED driver.

8. The light fixture of claim 7, further comprising:

a multi-lamp LED driver, wherein the multi-lamp LED driver is connected to at least two of the LED lamps, and to a selected one of the LED drivers and wherein the multi-lamp LED driver includes a multi-lamp controller,

wherein the controller of the selected LED driver is operable to;

in response to a received signal, activate its corresponding LED driver so that the LED lamp associated with the selected LED driver is activated;

monitor an operating parameter of the selected LED driver to determine when the operating parameter satisfies a predetermined value; and

once the selected LED driver satisfies the predetermined value, deactivate the LED driver so that the LED lamp associated with the selected LED driver is deactivated and transmit a selected signal to the multi-lamp LED driver, and

wherein the multi-lamp controller is operable to;

in response to the signal received from the selected LED driver, concurrently activate the LED lamps connected to the multi-lamp LED driver.

9. The single light fixture of claim 7, wherein the plurality of LED drivers includes a previous LED driver and wherein the at least one of the LED drivers receives the received signal from the previous LED driver.

10. A method for controlling a plurality of LED drivers within a single light fixture, comprising:

activating, by a first LED driver, a first LED lamp, wherein the first LED lamp comprises a plurality of LEDs;

monitoring, by a first LED controller associated with the first LED driver, an operating parameter of the first LED driver;

once the operating parameter satisfies a predetermined value, deactivating the first LED driver and the first LED lamp and transmitting, by the first LED controller, a signal to a second LED controller associated with a second LED driver;

in response to receiving the signal, activating, by the second LED driver, a second LED lamp, wherein the second LED lamp comprises a second plurality of LEDs,

wherein the first LED driver is distinct from the second LED driver, the first LED lamp is distinct from the second LED lamp, and the first LED controller is distinct from the second LED controller; and

wherein the first LED driver, the first LED lamp, the second LED driver, and the second LED lamp are within the single light fixture.

11. The method of claim 10, wherein the operating parameter is operating time and the predetermined value is based on a selection from the group consisting of:

expected operating life of the first LED driver, expected operating life of the first LED lamp, and expected lumen depreciation of the first LED lamp.

12. The method of claim 10, wherein the operating parameter corresponds to an output of the first LED driver and the predetermined value is based on a selection from the group consisting of:

a value that indicates a failure of the first LED driver and a value that indicates a performance degradation of the first LED driver.

13. The method of claim 10, further comprising:

monitoring, by the second LED controller, a second operating parameter of the second LED driver;

once the second operating parameter satisfies a second predetermined value, deactivating the second LED driver and the second LED lamp and transmitting, by the second LED controller, a second signal to a multi-lamp LED controller associated with a multi-lamp LED driver, wherein the multi-lamp LED driver is connected to the first LED lamp and the second LED lamp; and

concurrently activating, by the multi-lamp LED driver, the first LED lamp and the second LED lamp.

14. The method of claim 13, wherein the first LED driver drives the first LED lamp at a first level and the second LED driver drives the second LED lamp at a second level and wherein the multi-lamp LED driver drives the first LED lamp at approximately the first level and drives the second LED lamp at approximately the second level.

15. The method of claim 13, wherein the first LED driver drives the first LED lamp at a first level and the second LED driver drives the second LED lamp at a second level and wherein the multi-lamp LED driver drives the first LED lamp at a level that is distinct from the first level and drives the second LED lamp at a level that is distinct from the second level.

16. A method for controlling a plurality of LED drivers within a single light fixture, comprising:

activating, by a first LED driver, a first LED lamp, wherein the first LED lamp comprises a plurality of LEDs;

monitoring, by a first LED controller associated with the first LED driver, light intensity output by the first LED lamp;

once the light intensity output by the first LED lamp satisfies a predetermined value, deactivating the first LED driver and the first LED lamp and transmitting, by the first LED controller, a signal to a second LED controller associated with a second LED driver;

in response to receiving the signal, activating, by the second LED driver, a second LED lamp, wherein the second LED lamp comprises a second plurality of LEDs,

wherein the first LED driver is distinct from the second LED driver, the first LED lamp is distinct from the second LED lamp, and the first LED controller is distinct from the second LED controller; and

wherein the first LED driver, the first LED lamp, the second LED driver, and the second LED lamp are within the single light fixture.

17. The method of claim 16, further comprising:

monitoring, by the second LED controller, light intensity output by the second LED lamp;

once the light intensity output by the second LED lamp satisfies a second predetermined value, deactivating the second LED driver and the second LED lamp and transmitting, by the second LED controller, a second signal to a multi-lamp LED controller associated with a multi-lamp LED driver, wherein the multi-lamp LED driver is connected to the first LED lamp and the second LED lamp; and

concurrently activating, by the multi-lamp LED driver, the first LED lamp and the second LED lamp.

18. The method of claim 17, wherein the first LED driver drives the first LED lamp at a first level and the second LED driver drives the second LED lamp at a second level and wherein the multi-lamp LED driver drives the first LED lamp at approximately the first level and drives the second LED lamp at approximately the second level.