Active Thermal Management of High Power LED Array

LED technology improved its efficacy through its innovative structures and development. General lighting and automobile industries are rapidly shifting from halogen lamps to LED lamps. LED is popular due to its high lumen output and efficiency which is considered a significant advantage. LED produces localized heat at its junction which directly affects its maximum lumen output range and even leads to failure. The conventional method for LED thermal management involves passive cooling using heat sinks and coolant fluid. The present work emphasizes active cooling of LED array considering various real- time parameters such as junction temperature, ambient and heat sink temperature. The LED experiences active cooling with the help of the feedback system loop controlling the junction temperature by varying the fan speed based on the heat sink temperature sensor output. This work also deals with investigating the efficiency of commercial LED using an integrating sphere which gives valuable input for the LED arrays to maintain at the maximum lumen output. The result shows a maximum of 16.667% reduction in junction temperature and an increase in light output maximum of about 5.69% using the proposed active cooling system.