| LED light source is a cold light source. With the advantage of high luminous efficiency,long life, energy saving and environmental friendly, etc., LED are widely used in daily agricultural and industrial lighting. The LED light source span life is greatly affected by the LED junction temperature. The higher the junction temperature was, the shorter its life would be. So in recent years, high-power LED lighting thermal design and research become the focus of LED lighting research field.This paper, a 150 W high-power LED mining lamp thermal design exchange will be implemented with the requirement of one LED lighting lamp company. The force convection will fans strategies was taken in Its original design. While, the natural convection was used in the redesign strategies for this 150 W LED lamp. In this package,the other requirements on costs, heat sink weight etc., were also considered. At last, LED light source junction temperature was controlled under 85 ℃, and the customer’ other requirements were satisfied. this paper will be developed in the following steps:1 Under the constraints given by the customer, natural convection was adopted, the heat transfer theory, the sunflowers are generally equivalent to a traditional heat sink model,the Rayleigh number in natural convection was calculated. And the optimized FIN space was gotten. Under the constraints from the customer, the detail parameters of the sun flower was calculated. And then by consulting with the supplier, the whole manufacture process of the heat sink was planed, and its total costs was also given by the supplier.2 Construct the thermal test bench, the 150 W LED High Power LED mining lamp system was tested on the platform under the ambient temperature of 28℃.3 The simplified and equivalent physical of the heat sink model was constructed.electronic thermal simulation software ICEPAK was used to simulated this model for its simplified physical model construction and smart gridding and theory. The numerical simulation results was analyzed on the heat sink model performance in heat conduction, convection and the temperature field in the calculation region.Based on the above research word, the following results can be gotten: under the constrains from the customer, the 150 W LED mineral lamp of 126 beads, the sun flower diameter was 200 mm, and its height was 200 mm, with 48 FINs. The optimized FIN space was 8.6 mm in average for heat convection, and the heat transfer coefficient was about 4.3W / m2 k. its weight was about 3.5kg. The total cost of the sun flower is about 158 Yuan RMB. Test data obtained from the experiment shows that, the maximum temperature of the in the bottom of the sun flower was 54℃, and back of the PCB board temperature was64℃ under the condition of ambient temperature of 28℃. And then actual maximum temperature of The bottom surface of sun flower can be inferred is about 60℃. The LED junction temperature can be controlled under 85 ℃ in this case. While the maximum temperature of the heat sink was 60℃ in the numerical simulations under the ambient temperature of 25℃, which indicated that 3℃ difference between the experiment and the simulation results. However, we still think that the experiment, the numerical simulation results and the theory calculation are in good agreement with each other for the reason that in the we could not obtain the real maximum temperature in the sun flower bottom surface in the thermal couple locating. |
PDF Full Text Request