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ABSTRACT
The junction temperature of LED (light emitting diode) has a significant impact on its performance and lifetime. In this paper, a simplified model based on the finite element analysis is developed to simulate the temperature distribution of the 200 W LED module using software ANSYS. The model contains LED package, the heat pipe radiator, as well as TIM (thermal interface material) between the LED package and radiator. The temperature distribution of the simulation agrees with that of the experimental measurement. Thickness of TIM affects the heat dissipation significantly, the chips temperature and the maximum temperature difference of chips increases sharply with TIM thickness increasing. Substituting aluminum fins with copper fins cannot improve the heat dissipation performance of heat pipe radiator, and the air velocity of heat pipe radiator plays a key role in the heat dissipation. Thermal conductivity of package submount directly affects the chip temperature and the uniformity of temperature distribution of package submount.
Nomenclature
| A | = | cross-sectional area of the heat pipe (m2) |
| COB | = | chip on board |
| h | = | convection heat transfer coefficient (W/m2·K) |
| k | = | thermal conductivity (W/m·K) |
| keff | = | axial effective thermal conductivity of heat pipe (W/m·K) |
| Lad | = | length of adiabatic section of heat pipe (m) |
| Lc | = | length of condenser of heat pipe (m) |
| Le | = | length of evaporator of heat pipe (m) |
| Leff | = | effective characteristic length of heat pipe (m) |
| LED | = | light emitting diode |
| Qh | = | heat input to one U-shape heat pipe (W) |
| Tc | = | mean condenser temperature of heat pipe (K) |
| Te | = | mean evaporator temperature of heat pipe (K) |
| ΔT | = | value of Te minus Tc (K) |
| Tmax | = | maximum temperature of submount (K) |
| Tmin | = | minimum temperature of submount (K) |
| TIM | = | thermal interface material |
| v | = | air velocity of radiator (m/s) |
Acknowledgments
The authors acknowledge the support of the Science and Technology Project of Changsha under contract no. k1403017-11 and Science and Technology Project of Guangdong Province under contract no. 2016A010101028. Also, we would like to thank Qiang Yi and Zhibin Ye for valuable discussions concerning this work.
Additional information
Funding
Notes on contributors
Jicheng Zhou
Jicheng Zhou is a professor in the school of Energy Science and Engineering of the Central South University (CSU) in China. He received his Ph.D. degree in materials science and engineering from CSU in 1999. He is involved mainly in scientific and technological research on solar cell materials, renewable energy systems and thermal management of electronic devices.
Xing Chen
Xing Chen is pursuing a master's degree from the school of Energy Science and Engineering in the Central South University of China, under the direction of Professor Jicheng Zhou. He received his B.E. degree in 2014 from the same university. He is currently working on heat dissipation of high-power LEDs and aluminum paste for solar cells.
Zhuang Zhou
Zhuang Zhou recently received his master's degree at the School of Energy Science and Engineering in the Central South University, under the direction of Professor Jicheng Zhou. He received his B.E. degree in 2013 from the Inner Mongolia University of Technology, China. He is currently working on heat transfer in electronic devices.
Yinqiao Peng
Yinqiao Peng is an associate professor in the School of Electronics and Information Engineering at the Guangdong Ocean University, China. He received his Ph.D. degree in 2013 from the School of Materials Science and Engineering in the Central South University of China. He is currently working on electronic information materials and devices.
Yunyun Wang
Yunyun Wang is currently a Ph.D. student at the School of Energy Science and Engineering in Central South University, under the direction of Professor Jicheng Zhou. She received her master's degree from Guangxi University of China in 2012. She is currently working on the design and optimization of high efficiency crystalline silicon solar cells.
Jinhui Huang
Jinhui Huang recently received her master's degree at the School of Energy Science and Engineering in the Central South University, under the direction of Professor Jicheng Zhou. She received her B.E. degree in 2013 from the same university. She is currently working on heat transfer in electronic devices.