CONTROLLED OPERATION OF A LED LIGHTING SYSTEM AT A TARGET OUTPUT COLOR

摘要

A method for operating a LED lighting system has three or more LED emitters of different colors. The method allows finding the optimal drive setting for each LED emitter of the system, taking into account a specific target color. The method involves providing calibration data for each LED emitter at a plurality of values of drive setting and junction temperature, and executing a drive recursion loop calculating the drive setting of each emitter based on an input value for the temperature of each emitter and in view of the target output color and of the calibration data. Advantageously, this can be accomplished without measuring the color emitted by the LED lighting system, that is, no color feedback is required. A LED lighting system implementing the method is also disclosed.

主权项

1. A method for operating a LED lighting system at a target output color, the LED system having three or more LED emitters emitting light of different colors, each LED emitter being operable at a controllable emitter drive setting and having a junction temperature, the method comprising the steps of:
a) providing calibration data for each LED emitter at a plurality of values of the corresponding emitter drive setting and at a plurality of values of the corresponding junction temperature; b) executing a drive recursion loop calculating the drive setting of each emitter based on an input value for the junction temperature of each emitter and in view of the target output color and of the calibration data; c) applying the drive settings obtained at step b) to the LED emitters; d) determining an operation value for the junction temperature of each LED emitter; e) executing the drive recursion loop calculating the drive setting of each emitter using the operation value of the junction temperature of each emitter as the input temperature value therefor; f) applying the drive settings obtained at step e) to the LED emitters; and g) repeating steps d) to f) for a predetermined number of times.