| 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. |
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