Research On Heat Dissipation Performance For High Power LED Lighting Structures

LED as a new lighting source, with advantages of high lumen, high lightingefficiency, long life, will take the place of traditional lighting sources; and thedevelopment of LED is bringing a new industrial revolution lighting revolution.With LED developing to high-power models, its calorific power increases;however, the calorific power restricts overall function of LED. In lighting industry，life of LED lighting source directly restricts life of the whole lamp. The issue ofheat-dissipation is the key element that shortens the life of LED. Started fromfeatures of LED and design-technologies of lamps, this essay researches on thecurrent design philosophy of lamps and the design of heat-dissipation.Software-emulation and experiments are used to illustrate methods to enhanceheat-dissipation. Detailed processes are as below:1、 Introduce the lighting theory of LED; analyze the impacts of junction-heat’sincreasing on luminous flux, forward voltage and color temperature.2、 Analyze main elements that influences heat conduction. compare influences ontemperature from various medium with different thermal conductivity.3、 Analyze feature of heat convection and radiation, do temperature rise test byusing various on heat-dissipater; draw a conclusion that radiation is directlyinfluenced by temperature, surface-coating.4、 Introduce theory of graphite heat sink and its advantages, disadvantages.Analyzeits future application on LED lighting wares.5、 With icepack analogue simulation of heat sink installation direction, speed offluid and size of mcpcb in heat-dissipation mode groups. get results of analoguesimulation, then analyze.6、 Analyze lamp of MR16mode, optimize the thickness, height and space of heatsink fin in MR16.Get its most optimized size and realize its function of fallingtemperature.7、 Do thermal analysis on structure of mainstream-selling LED bulbs, and design a kind of bulbs with optimized heat-dissipating structure.