Design And Experimental Study Of The Radiators For High Power Led Lamps

With successful development and enhancing the luminous efficiency, commercial white LED (Light Emitting Diode, LED) lighting lamp that is energy-saving, environmental, and long-life has begun to gradually replace the traditional ones. While a large amount of heat has been produced in the work, and the LED chip is sensitive to the temperature. If the heat can’t be loss in time, the temperature will rise rapidly, which will affect the service life, luminous efficiency, light color (wavelength), the forward voltage, the injection current and reliability of LED. Excess temperature even will permanently damage the LED.First of all, cooling mode of LED lamp, cooling mechanism of high-power LED lamp, basic heat transfer theory of metal-plastic composite heat exchanger and the technology of metal-plastic composite have been introduced in this paper.Secondly, on the basis of plate heat exchanger, micro metal, plastic and metal-plastic composite heat exchanger which the place of joint is rectangular, trapezoidal and plane, have been simulated and analyzed in this paper. To a certain extent, the results have demonstrated that the cooling performance of micro metal-plastic composite heat exchanger is better than that of micro metal and plastic heat exchanger. Then the single factor simulation experiment of micro metal-plastic composite heat exchanger has been carried out, and general rules that several factors influence heat dissipation performance of heat exchanger have been obtained. Finally the orthogonal test and range analysis have been carried out, and it has been obtained the priority of several factors affecting the heat exchanger performance and the optimized structure.Thirdly, thermal simulation of the LED bulb lamp with heat exchanger of general metal structure, general conductive plastic structure, micro triangular structure or micro hemispherical structure has been carried out, and it has been simulated and compared the simulation results of several structures. Based on the several structures, LED bulb lamps added heat conduction material has been analyzed, and results show that the thermal performance of LED bulb lamp has been significantly improved when conductive material has been added.Finally, a system of measuring temperature about natural convection has been set up in this paper, and the junction temperature measurement experiments of LED chip thermal stability and the junction temperature measurement experiment of normal stable work have been carried out.