LED street lights profiling: considering the optical thermal characteristics

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The LED used in road lighting is involved in materials, device development, optical structural design, packaging materials, drive circuit, the development of lamps, lighting effects and visual matching, detection metho ds such as multi-disciplinary high-tech field. With the LED production process matures, LEDs and traditional light source compared to long life, good color rendering, high luminous efficiency, luminous and strong direction, approximate point light sources such as determine the characteristics of the LED with the potential to enter the field of road lighting. In order to better promote the application of the white LED on the road lighting must be from the depth of the height of the theory and practice the key technologies of the second optical design, thermal management and drive power to conduct a comprehensive study and integrated balance, so that its energy-saving advantages to be fully reflected, in order to get wider application of LED street.

Relative to the indoor LED lighting products, LED lights are much more complex. LED street light application design determine the lighting needs to determine the design objectives, it is estimated that many aspects of th e light - electric - heat integrated features, calculate the number of downlight led to select the best design solutions, LED street light - electricity - heat The characteristics of the design study is the focus of domestic and foreign research institutes and enterprises are most concerned about.

Philips and Osram and other international companies, the Hong Kong Applied Science and Technology Research Institute, University of Hong Kong and the United Kingdom Imperial College Professor Xu Shuyuan group, the research group of Professor Luo Yi of Tsinghua University, Huazhong University of Science and Technology, Professor Liu Sheng group, Xiamen University, Professor Chen Zhong group, respectively. publish original research results from the perspective of LED street light system with light, heat, drive circuit, detection methods.

In the secondary light distribution, the variable separation mapping me thod to solve the free surface of the LED lights with light edge ray principle and source extension law of conservation of structure parameters. In the heat, micro-array cooling system or heat pipe system, a combination of numerical simulation methods to calculate the thermal field of different power type LED lights, street lighting system, optimal operating temperature. In the drive, LED light - electricity - heat integration of theoretical guidance for the lampada led driver circuit design, design principles to break through the traditional active drive circuit, the new passive LED driver circuitry to try groundbreaking applications in the field of street lighting, so that The circuit system has a longer life, more environmentally friendly. In the detection of transient thermal response characteristics combined with the theory of the structure function analysis of the thermal resistance of the system of internal lay ers of material - Heat Capacity.