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为了降低发光二极管(LED)灯具的重量和生产成本,根据烟囱效应原理,设计了一种无散热器的LED异形灯。利用Solidworks软件建立三维模型,通过其插件Flow Simulation进行热仿真。并以烟囱高度为30mm,烟囱通道直径为20mm的参数为基础模型,研究不同烟囱高度和烟囱通道直径对LED异形灯最高温度的影响。仿真结果表明:对于烟囱高度和烟囱通道直径都为45 mm,基板重量为35.86g的LED异形灯,当输入功率为6,8,10 W时,其最高温度都低于芯片的安全结温85℃,可满足LED安全工作的要求。对8W的LED异形灯进行实验验证,结果表明LED异形灯的最高温度为73℃,与仿真结果仅相差2.06℃,验证了仿真的正确性。所设计的无散热器LED异形灯不仅可以很好地满足LED散热要求,而且重量轻、成本低、制造简单。
In order to reduce the weight and production cost of light-emitting diode (LED) lamps and lanterns, according to the chimney effect principle, an LED-shaped lamp without a radiator is designed. Using Solidworks software to build 3D models, through its plug-in Flow Simulation for thermal simulation. Based on the parameters of chimney height of 30mm and chimney channel diameter of 20mm, the effects of different chimney height and chimney channel diameter on the maximum temperature of LED shaped lamp were studied. The simulation results show that for the chimney height and chimney channel diameter of 45 mm, the substrate weight of 35.86g LED shaped lamp, when the input power of 6,8,10 W, the maximum temperature is lower than the chip’s safe junction temperature 85 ℃, LED safety can meet the requirements. Experimental results show that the maximum temperature of LED shaped lamp is 73 ℃, which is only 2.06 ℃ different from the simulation result. The correctness of the simulation is verified. Designed without heatsink LED shaped lamp can not only meet the LED cooling requirements, and light weight, low cost, easy to manufacture.