The application of LED in road lighting is a high-tech field involving the research of material devices, optical structure design, packaging materials, drive circuits, lamp development, lighting effects and visual matching, and detection methods. With the maturity of LED production technology, LED has a long life, good color rendering, high light efficiency, strong directionality, and approximate point light source, which determine the potential of LED to enter the field of road lighting. In order to better promote the application of white LEDs in road lighting, it is necessary to comprehensively study and comprehensively balance the key technologies such as secondary optical design, thermal management and driving power supply from the theoretical height and the depth of practice. The advantages of energy saving are fully reflected, so that LED street lights can be widely used.
LED street lights are much more complicated than indoor LED lighting applications. LED street light application design includes determining lighting requirements, determining design goals, estimating optical-electric-thermal integrated characteristics, calculating the number of LEDs required, selecting the best design, and so on, and the LED-light system's light-electric-heat Characteristic design research is the focus of most research institutions and enterprises at home and abroad.
International companies such as Philips and Osram, Hong Kong Applied Science and Technology Research Institute, Hong Kong University and Imperial College of Technology, Professor Xu Shuyuan's research group, Tsinghua University Professor Luo Yi's research group, Huazhong University of Science and Technology Professor Liu Sheng's research group, Xiamen University Professor Chen Zhong's research group Innovative research results have been released from the perspectives of light distribution, heat dissipation, drive circuits, and detection methods for LED street lighting systems.
In the secondary light distribution, the separation variable mapping method is used to solve the free-form surface light distribution structure parameters of the LED street lamp based on the edge ray principle and the law of conservation of the expansion of the light source. In terms of heat dissipation, a micro-array cooling system or a heat pipe system is used, and a numerical simulation method is used to calculate the thermal field of LED street lamps of different power types to obtain the optimal operating temperature of the street lamp system. In terms of driving, LED light-electric-thermal integration theory guides LED drive circuit design, breaks through the design principle of traditional active drive circuit system, and enables new passive LED drive circuit system to try groundbreaking application in street lighting field. Circuit systems have longer life and are more environmentally friendly. In terms of detection, the thermal resistance-heat capacity characteristics of each layer of materials inside the system are analyzed by the transient thermal response characteristics combined with the structure function theory.
Although some research work has been carried out on the LED street lamp system, how to comprehensively consider the light distribution effect, heat dissipation scheme and electrical characteristics of the LED street lamp system to achieve the optimal optimization of optical, thermal and electrical properties. Still need a lot of research and analysis work.
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