SYSTEM AND APPARATUS FOR CONTROLLING LIGHT INTENSITY OUTPUT OF LIGHT EMITTING DIODE ARRAYS

摘要

Disclosed herein is a system for controlling a drive current of an LED that includes a controller configured to estimate a junction temperature of the LED at a location of a heat sink. The system also includes a driver configured to change a drive current to the LED in response to a command from the controller. Also disclosed is a method of determining drive currents for LEDs in an array that includes determining a required light output intensity at a first time for each LED; estimating heat generated by each LED at the first time; solving heat flow equations for the array at the first time; estimating a junction temperature for each of the LEDs at the first time; and determining a drive current for the required light intensity at the first time for each of the LEDs based on the junction temperature.