SYSTEM AND METHOD FOR REGULATION OF LIGHT EMITTING DIODES

摘要

System and method for regulating light emitting diodes. An embodiment comprises providing a drive current to a light emitting diode (block 320), measuring a forward voltage drop over the light emitting diode (block 355), comparing the forward voltage drop with a threshold (block 360), and altering the drive current in response to a determining that the forward voltage drop is less than the threshold (block 365). Due to a substantially linear relationship between a light emitting diode's forward voltage and its temperature, it is possible to determine if the light emitting diode is overheating by measuring the forward voltage and comparing it with the threshold. The use of the forward voltage eliminates the need for a temperature sensor, thereby reducing system complexity and cost.