The Structure Design And Simulation For LED Lamp

The light-emitting diode(LED) is recognized as the fourth generationlighting device, with the advantages of small volume，long lifetime, highreliability， it has been widely used in traffic lights, flat panel display,municipal engineering, as well as commercial lighting, etc. However, thereare still many technical difficulties for the current LED lighting: Firstly, thelifetime of LED driving power supply is short, affecting the service life of thelamp; secondly, the efficiency of LED light source with multi-chips packageis relatively lower, when LED light sources are applied to long distancelighting, the light energy utilization ratio is low; thirdly, the cooling materialusage of LED lamp heat radiator is large; to increase the resistance of heattransfer, thermal conductive silicone is needed to be coated between the LEDlight source substrate and the heat sink; heat transfer resistance of high powerLED lamp is big. The work in the paper was done as follows:1. The LED lamp with replaceable driving power supply is designed, whenthe driving power fails to work，the user needs only to replace it. The drivingpower supply is designed as an independent replaceable module, themechanical connection is achieved through buckle or thread structure andradiator, the electrical connection is realized through circular electricconnector or electrode and LED light source substrate, finally, the method isproved feasible by the sample lamp developed.2. An out-light surface of LED with microstructures is designed, using fourpyramid structure raised to increase exit cone angle of light source，thusimproving the effect of LED light source，the efficiency is improved about50%by the optical software simulation. A ring structure of LED light sourceis proposed to make the light rays reflect or refract at large divergence angle,and then emit at smaller divergence angle. The results show that thedivergence angle is smaller through optical software simulation. 3. The heat radiating device is designed by the use of chimney effectenhancing convection, the hot air is constrained in the chimney pipe, byincreasing the air buoyancy lift, the flow of air is intensified. A radiatordevice with heat integration structure of the light source is put forward, theheat of LED light source substrate is directly conducted to the radiatorthrough thermal conductive fluid, and then the heat is dissipated throughconvection with cooling fin of radiator, the device is also studied further, acooling device is designed by employing airbag. Under the circumstances ofpoor heat convection, the influence on lamp caused by different infraredemissivity of aluminum surface with oxidative and unoxidized is simulated.