Journal of Semiconductors>>2017,Volume 38>>Issue 12:124005-6    < Previous Article | Next Article >  
Fan Tang and Zhenning Guo.Design of a cylindrical LED substrate without radiator[J].Journal of Semiconductors,2017,38(12):124005-6
Design of a cylindrical LED substrate without radiator
Abstract: To reduce the weight and production costs of light-emitting diode (LED) lamps, we applied the principle of the chimney effect to design a cylindrical LED substrate without a radiator. We built a 3D model by using Solidworks software and applied the flow simulation plug-in to conduct model simulation, thereby optimizing the heat source distribution and substrate thickness. The results indicate that the design achieved optimal cooling with a substrate with an upper extension length of 35 mm, a lower extension length of 8 mm, and a thickness of 1 mm. For a substrate of those dimensions, the highest LED chip temperature was 64.78 ℃, the weight of the substrate was 35.09 g, and Rjb = 7.00 K/W. If the substrate is powered at 8, 10, and 12 W, its temperature meets LED safety requirements. In physical tests, the highest temperature for a physical 8 W cylindrical LED substrate was 66 ℃, which differed by only 1.22 ℃ from the simulation results, verifying the validity of the simulation. The designed cylindrical LED substrate can be used in high-power LED lamps that do not require radiators. This design is not only excellent for heat dissipation, but also for its low weight, low cost, and simplicity of manufacture.
Keywords: cylindrical substrate  highest temperature  LED  without radiator  chimney effect
Author NameAffiliation
Fan Tang Huaqiao University, College of Information Science and Engineering, Key Laboratory of Light Propagation and Transformation of Fujian Province, Xiamen 361021, China 
Zhenning Guo Huaqiao University, College of Information Science and Engineering, Key Laboratory of Light Propagation and Transformation of Fujian Province, Xiamen 361021, China 
 
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