Led lighting controller

Abstract

A switch mode power supply controller provides power to a pair of light sources. The controller includes a low voltage programmable current source and adjusting elements for independently adjusting the current to the LED light sources. The controller also includes a first communication port for receiving a communication from an external device, such as a dimmer, or from another power supply controller; and a second communication port for sending a communication to a third power supply controller. These ports provide an upstream and downstream communication capability through a chain of controllers so that input from a device can be communicated upstream and downstream.

What is claimed is: 
     
         1 . A method of controlling a LED lighting system, the method comprising:
 receiving a communication from an external device via a first communication port;   adjusting an output level of at least one LED light source in response to the communication, wherein said at least one_LED light source comprises at least one diode and said at least one_LED light source is powered by a first switch mode power supply; and   repeating the communication via a second communication port to a further switch mode power supply, the further switch mode power supply powering a second at least one LED light source comprised of at least one diode and adjusting the second at least one LED light source's output level in response to the communication.   
     
     
         2 . The method of  claim 1 , wherein the listed steps are performed in order. 
     
     
         3 . The method of  claim 1 , with the additional step of repeating said communication via a communication port to a successive switch mode power supply, the successive switch mode power supply powering an LED light source comprised of at least one diode and adjusting said second at least one LED light source's output level in response to said communication for a plurality of switch mode power supplies, each successive switch mode power supply communicably coupled to the preceding switch mode power supply. 
     
     
         4 . The method of  claim 1 , wherein the external device is a photosensor. 
     
     
         5 . The method of  claim 1 , wherein the external device is a dimmer. 
     
     
         6 . The method of  claim 1 , wherein the external device is a motion sensor.