Study Of Analytical Methods On Thermal Characteristics Of High Power LED Application Design

As lighting source, high power LED has tended to be ripe in the recent decade development of technology. With technical progress and product up-graduation of light source gear, lighting technology of the new generation has started from the stage of using in experiment and technical research to the stage of focusing on application and popularization of replacement. After experiencing the stage of original research application, the research of application designed technology in high power LED becomes much more important. The core requirement of application design in high power LED is to satisfy the high luminous efficiency, the suitable light distribution, the stable work and low lumens depreciation of lighting, which need the deep knowledge and analyses of the characters of the gears. In this dissertation, it mainly researches and discusses the analyzing method of the thermal properties of high power LED to provide basic gist and method of application design in high power LED.The foundation of application design is the research in thermal properties of high power LED. Considering the effect of performance characteristics caused by junction temperature of LED and lumens depreciation and reliability brought by it, this dissertation will not confine single temperature or technical indicator analysis of heat, but analyze and research by the structural characteristics of gears themselves and multi parameter characteristic of light, electric and heat, including the circuit structure of LED component, the drive model of different topological structure, the analyses of LED thermal resistance, the thermal field distribution characteristics of gears and constant current drive circuit design. The thermal radiation detection technology is an effective method in researching the thermal characteristic design of high power LED, especially achieving visualization technology of thermal radiation field, which can more intuitively know and analyze the thermal characteristics of lighting source gears. Achieving the thermal field detection of lighting gears and visualization technology are also important parts in this dissertation. To roundly analyze the electric thermal characteristics under the model of different structures of high power LED and increase the quality of application design of LED lighting, it makes the research about the above important parts of thermal characteristic and get below innovative research results:Using infrared thermal detection technology to analyze the thermal characteristics of LED, offer the equal emission rate method to achieve the non-contact temperature measurement. Under the consider of thermal balance, using Stephen Bohr’s total radiation, achieves the thermal radiation of calculating thermometry. On the basic of analyses in experimental data and theory research, provides the math calculating model of LED thermal radiation. According to the model of foundation structure, it analyzes and researches the influence characteristic of drive method. It gives the influence caused by circuit topology of multi chips high power LED and layout structure, analyzes the volt-ampere characteristics of LED gears under constant circuit drive model and the model of optimization selection of the gear circuit topology under constant drive model, which provides the theory according of choice in circuit topology of gears.This dissertation provides thermal characteristics method of high power LED based on thermal radiation data visualization. For the thermal design of high power LED transfer the single abstract lumped parameter to the visual direct thermal field status description. Based on the visual foundation data of thermal field, it builds the analyses method of the graphicalization characteristics. Taking full advantage of intuitive graphical representation of radiation data, it provides more effective trend watch and comparing analyses method of thermal field in high power LED gears.In the research, it uses the incorporation of theory analyses and experimental data. Considering the thermal characteristic and related the research of drive technology of high power LED and using the completed visual system, it collects the data and analyzes the test of integrated LED gears, gives the result of calculating temperature based on the equal emission rate thermometry and compares the test analyses so that it can verify the validity and usability. The model and testing data given by the dissertation are effective and helpful. The completed designed software has good practicability, which can be farther analyses research and effective tool of designed application.