Thermal Management and Heat Dissipation Design for High-power LEDs

Thermal path and the corresponding thermal resistance of high-power LED is analyzed and calculated.The heat flow analysis and heat dissipation optimal design of high-power LED is realized by using commercial computational fluid dynamics(CFD)software.Theoretical calculation result shows that the total thermal resistance of high-power LED from the junction to the ambient is 28.67 ℃/W.When the dissipated power is 1 W and the ambient temperature is 25 ℃,the junction temperature of high-power LED is 53.67 ℃.Simulation result shows that on the same working conditions the junction temperature of high-power LED is 54.85 ℃.It is good agreement with the theoretical calculation results.The results show that when the area of heat dissipation increases to a certain value,the heat dissipation effect remains a constant.Thus,considering the lower product costs,the area of heat sink has a threshold range.When the heat sink is installed for the vertical fins to the left,the air-fluid flow on unimpeded,the heat dissipation has the best effect,and the junction temperature of high-power LED is lowest.