Design Of The Structure And Parameters Optimization In High-power LED Lamp Radiator

High power LED device as a green solid-state lighting of high conversion rate is currently one of the most development prospects of emerging industries. LED street lamp is high power, high heat flux density of electronics, facing the street light temperature accumulation at the centre of the problem in the long time work. Heat problem of LED devices work is not stable, lead to street lamp lighting the sharp drop in life and efficiency. The study of heat problem of LED lamp is very necessary. On the basis of this background, we discussed the key problems in this paper, such as the thermodynamic parameters and heat dissipation structure.Research LED street lamp model established by using finite element software, and numerical simulation of the internal heat accumulation problem, the highest temperature influence the street lamp and the center of the heat transfer factor is analyzed. Found in the street lamp radiator isometric fin structure, between the fin, in terms of the radiator center fin thickness and the thickness of the bottom of the radiator had a greater influence on the horizontal and vertical heat transfer capability. In order to further study the effect of the several factors to the street light heat dissipation ability, using orthogonal test method on the basis of different factors to design the corresponding orthogonal table, corresponding form finite element numerical simulation of the heat dissipation structure, get the final optimized structure.The optimized scheme to solve the general LED street light center the problem of high temperature heat dissipation structure, make the structure of the center temperature close to the edge of the temperature structure, effectively reduce the highest temperature of the radiator, and accelerated the overall structure of the cooling rate and cooling efficiency. The work done by mainly includes the following several parts:First, study of the thermal parameters and thermal model of LED. According to the thermal parameters of LED lamp, respectively to the single chip and chip street light thermal model is established, discusses the key problems affecting the lamp temperature rise. Secondly, carries on the experimental analysis, the use of appropriate temperature measuring method, measure the temperature of the single chip and lamp when it work to the steady state, and summarizes the experimental data analysis.Again, in view of the problem to be solved, study of the design method of LED street radiator. Through research and analysis of the high heat flux density of the electronic device cooling classic methods and non isothermal finned heat characteristic, three are three important factors influencing the performances of the LED street, respectively, lamp radiator center fin thickness, the thickness of the base plate and the degree of density finned structure.Finally, simulation experiment was carried out on the plan, corresponding to the three factors influencing the radiator cooling orthogonal list by orthogonal experimental design method, numerical simulation of the temperature of the LED street lamp listed in the table, and analysis of simulation results, to get the optimization of LED street light temperature effectively control combination.