Investigation On Performance Of Micro-scale Phase-change Heat Sink For High-power Led

With the development and improvement of the packaging processing of semiconductor, luminous flux and luminous efficiency, power-type LED is widely used in traffic sign, urban landscape, auto lighting and LED billboard, and will stride toward the market of general lighting. Though the input power of LED chip continuously improve, it calls for the development of both packaging processing and equipment of LED in order to solve the problems caused by high heat and high luminous efficiency. At present, the dimension of power-type LED is 1mm×1mm~2.5mm×2.5mm, but its heating power is above 1W, so its heat flux density has reached above 100W/cm2. Once the temperature is over the extreme, the failure rate of LED will climb up exponentially. The traditional solid heat sink, which is used as the packaging structure, can not fulfill the requirement of thermal dissipation brought by high-power LED of high heat flux density. Therefore, in order to realize the industrialization of high-power LED, it is the key point to research the new packaging heat sink characterized by low thermal resistance and high heat transfer efficiency.A new micro-scale phase-change heat sink for high-power LED based on the principle of phase change thermal transmission is made in this thesis. An experiment is designed to compare the performance between this new type heat sink and traditional solid heat sink, and is introduced as followed:1. Design and manufacture of the micro-scale phase-change heat sink. Based on the principle of the heat transfer and the requirements of the packaging for the high-power LED, a new type of the micro-scale phase-change heat sink will be designed and produced.2. Research and development of the performance testing system for micro-scale phase-change heat sink. A performance testing system for micro-scale phase-change heat sink will be designed, which is based on the virtual instrument and can achieve the real-time monitoring during the experiment and the functions of the online collection, storage, analysis for the data.3. Production of the performance testing platform for the micro-scale phase-change heat sink. A performance testing platform for the micro-scale phase-change heat sink will be produced based on the principle of heat transfer, which can achieve the work for the heating, cooling and temperature testing of the micro-scale phase-change heat sink under the variety of operating conditions.4. Research and analysis for the micro-scale phase-change heat sink. The performance testing experiments will be carried out. The performance of the micro-scale phase-change heat sink of the different heating power, work fluid, wick structure and working angle will be analyzed, and the performance of the traditional solid one will be compared.