LED lighting unit

• US 20080074872A1
• Filed: 09/25/2006
• Published: 03/27/2008
• Est. Priority Date: 09/25/2006
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Inventors: Panotopoulos, George
• Granted Patent: US 7,607,798 B2
• Time in Patent Office: Days
• US Class Current: 362/231
• CPC Class Codes: H05B 45/20 Controlling the colour of the light
• CPC Class Codes: H05B 45/22 using optical feedback
• CPC Class Codes: H05B 47/185 via power line carrier transmission
• CPC Class Codes: H05B 47/19 via wireless transmission
• CPC Class Codes: H05B 47/29 Circuits providing for substitution of the light source in case of its failure

Abstract

A lighting unit having a light generation section, a light analysis section, a controller, and a first communication interface is disclosed. The light generation section and the light analysis section are housed in a housing having a transparent window. The light generating section includes a plurality of groups of LEDs, each group emitting light of a different spectrum than the other groups. The light analysis section generates intensity signals related to the intensity of light generated by each of the groups and the intensity of light originating from a location outside the housing. The controller adjusts a current through each of the LEDs in response to the intensity signals. The first communication interface is utilized by the controller to communicate with a device external to the lighting unit for receiving commands during the operation of the lighting unit.

Claims

1. A lighting unit comprising:

a light generating section comprising a plurality of groups of LEDs, each group emitting light of a different spectrum than said other groups, one of said groups including a plurality of LEDs;

a light analysis section that generates an intensity signal related to the intensity of light generated by each of said groups;

a controller that adjusts a current through each of said LEDs in response to said intensity signals;

a housing having a transparent window, said light generation section and said light analysis section being within said housing,

a first communication interface that said controller utilizes to communicate with a device external to said lighting unit for receiving commands during the operation of said lighting unit,

wherein said light analysis section also generates an ambient intensity signal related to the intensity of light originating from a location outside of said housing.

2. The lighting unit of claim 1 wherein said controller alters said current through one of said LEDs in response to a change in said ambient intensity signal.

3. The lighting unit of claim 1 wherein one of said groups comprises a spare LED that emits light in said spectrum of that group and wherein said controller detects an LED that is defective in that group and causes said spare LED to be connected in place of said defective LED.

4. The lighting unit of claim 1 wherein said controller sends information on said first communications interface specifying said ambient light intensity signal.

5. The lighting unit of claim 1 wherein said first communication interface comprises a detector for receiving light signals from outside said housing.

6. The lighting unit of claim 1 further comprising a power interface for powering said lighting unit from an external power source, said first communication interface comprising a transmitter and receiver for receiving a signal over said power interface.

7. The lighting unit of claim 1 wherein said first communication interface comprises a transmitter and receiver for sending and receiving RF signals, respectively.

8. The lighting unit of claim 5 further comprising a power interface for powering said lighting unit from an external power source and a second communication interface, said second communication interface comprising a transmitter and receiver for receiving said signal over said power interface.

9. The lighting unit of claim 1 wherein said light analysis section further comprises an infrared detector that generates a signal indicative of light in the infrared portion of the optical spectrum received from outside of said enclosure.

10. The lighting unit of claim 8 wherein said light signals include information specifying an address for said lighting unit, said controller responding to commands directed to that address that are received on said second communication interface.