Design and Characterization of LED Engine Module for the Application of Thermoelectric Device

Abstract

Variation of thermal resistivity depending on temperature difference and measurement of thermal resistivity of thermoelectric device in LED lighting engine module were studied. Power generated from waste heat and photometric characteristics of LED engine module were measured. From the measured and analysed data, the followings were concluded. Control of temperature difference at the low temperature was advantageous for LED module compared to temperature difference control at high temperature. The sum of the measured thermal resistance of LED module and thermoelectric device was 2.654K/W and the measured total thermal resistance was 2.41K/W. In a thermal simulation, minimum LED p-n junction temperature was 69.3℃ when 23 pieces of pins with 1mm thickness were used. When 700mA was applied to the LED engine module, 0.086W of maximum power was obtained with 0.15A of load. Light efficiency of LED module with thermoelectric device was 126.9lm/W and 3.7lm/W of efficiency decrement.