The effect of temperature on High Voltage LEDs and the application with Desk Lamp

• Main Authors: Hun-yu Su, 蘇涵宇
• Other Authors: Sai-cheong Hsu
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/61158879061024636318

碩士 === 國立臺南大學 === 電機工程學系碩士班 === 101 === The first part of the study would explore the illumination characteristics in terms of InGaN as the light-emitting layer’s High Voltage LED and High Power LED, and it’s found from the experimental results that the attributes of LED would be affected by the temperature of interface and drive current. At first, the change of temperature would influence the lattices of material atoms and doping atoms; while the temperature goes on rising, the moving speed of current carrier would slow down instead, that’s because when the current carrier moves, it would collide with vibrating doping atoms, then, scattering phenomenon is occurred and led to wastage that makes current decrease. From experimental results, we can see that HV LED and HP LED have a similar trend, i.e. while the temperature rising, the strongest illumination would be declined, and the correspondent current would also follow suit. Secondly, when drive current is rising, the conversion efficiency of LED’s illumination would decline, which has something to do with temperature. That’s because when the current is rising, parts of the current has lost and transformed into heat which make the temperature of LED rise and conversion efficiency decline, such phenomenon has been proved by the experiment. Therefore, the advantage of HV LED consists in small current operation, since it would generate less wasted heat, and it would be helpful to LED’s longevity only by way of designing proper total surface area of radiation. Since there are various applications of HV LED, the second part of the study would choose the DC LED lamp of 101A1 produced by Chi-Mei to engage in simulation experiment. Then, use the software, SolidWorks, to paint the 3D model of diffuser, and after it is input into optical simulation software, TracePro, to embark on optical simulation, the result shows the size of diffuser would affect the distribution of LED lamp’s illumination. If the lumenation needs to be improved, the arrangement model of LED should be changed to comply with the standard.