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The relationship between solar street light and photoelectric thermal characteristics

by:Litel Technology     2022-05-24
The application of LED in road lighting is a high-tech field involving the development of materials and devices, optical structure design, packaging materials, driving circuits, lamp development, lighting effect and visual matching, detection methods and other multidisciplinary fields. With the maturity of LED production technology, compared with traditional light sources, LEDs have long life, good color rendering, high luminous efficiency, strong luminous direction, similar to point light sources, etc., which determine that LED has the potential to enter the field of road lighting. In order to better promote the application of white light LEDs in road lighting, it is necessary to conduct comprehensive research and comprehensive balance on key technologies such as secondary optical design, heat dissipation management and driving power from the height of theory and the depth of practice. Only when its energy-saving advantages are fully reflected can solar street light be widely used. The light distribution effect, heat dissipation scheme and electrical characteristics of the street lamp system, so as to achieve the optimal coordination and optimization of optical, thermal and electrical properties, still require a lot of research and analysis work. Compared with the application of indoor LED lighting products, solar street light is much more complicated. The design scheme of solar street light application includes many aspects such as determining lighting requirements, determining design goals, estimating optical-electrical-thermal comprehensive characteristics, calculating the number of LEDs required, and selecting the best design scheme. -The thermal characteristic design research is currently the focus of most domestic and foreign research institutes and enterprises. International companies such as Philips and Osram, the Hong Kong Institute of Applied Science and Technology, the research group of Professor Xu Shuyuan of the University of Hong Kong and Imperial College, the research group of Professor Luo Yi of Tsinghua University, the research group of Professor Liu Sheng of Huazhong University of Science and Technology, and the research group of Professor Chen Zhong of Xiamen University respectively Published original research results from the perspectives of light distribution, heat dissipation, drive circuits, and detection methods of solar street light systems. In terms of secondary light distribution, the separation variable mapping method is used to solve the free-form light distribution structure parameters of solar street light based on the principle of edge ray and the law of conservation of expansion of light source. In terms of heat dissipation, a micro-array cooling system or a heat pipe system is used, combined with a numerical simulation method to calculate the thermal field of solar street light with different power types, so as to obtain the best working temperature of the street light system. In terms of driving, the LED driving circuit design is guided by the LED light-electricity-thermal integration theory, breaking through the design principles of the traditional active driving circuit system, allowing the new passive LED driving circuit system to try pioneering applications in the field of street lighting. The circuit system has the characteristics of longer life and more environmental protection. In terms of detection, the thermal resistance-thermal capacitance characteristics of each layer of materials inside the system are analyzed by means of transient thermal response characteristics combined with structure function theory.
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