Department of Electronic Engineering of Tsinghua University State Key Laboratory on Integrated Optoelectronics, Professor Luo Yi-based research group developed a new type of power type LED urban lighting technical breakthrough in a serious bottleneck, making the actual illumination distribution of LED lights approximately rectangular, and the illumination distribution very uniform, and road use than the current comprehensive energy-saving high-pressure sodium lamp more than 60%. Recently, the subject passed the Guangdong Provincial Science and Technology Department of the Expert Group on project identification, appraisal committee that the results of the main technical indicators have reached the leading domestic level.
Street lighting is an important part of the city, and its consumption occupies much of the electricity for lighting. Often used the traditional high pressure sodium lamps. High-pressure sodium lamps with high luminous efficiency of existing uneven distribution of illumination, the illuminated object color distortion, glare serious, life is short, high maintenance and other shortcomings, the overall polishing efficiency is low. Therefore, the development of new energy-saving lamps lighting the city has very important significance.
To GaN-based blue LED power-based synthesis of white and yellow phosphor luminous efficiency of LED has reached 130 lumens / watt, and has low production costs, device performance and stability, the market is easy to accept, efficient, energy saving, long life, color Index of good, cold light source, environmental friendliness, therefore, likely to become the first choice for the next generation of new street lights. LED is a light-emitting diode (Light Emitting Diode) English shorthand, which is based on the formation of semiconductor PN junction light emitting devices, in a certain forward bias voltage and injection current injected into the P region and N hole area of electronic After the diffusion to the active region issued by the radiative recombination photons of light energy directly into electrical energy.
However, the efficient production of power type LED lamp technology is facing a serious bottleneck. Single power type LED luminous flux made smaller, light-emitting chips with far-field distribution of the angle Lambertian distribution of intrinsic properties, resulting in a semiconductor lighting technology face a higher optical, thermal and technical barriers.
Power type LED used for lighting the special problems of urban roads, Tsinghua University, State Key Laboratory on Integrated Optoelectronics Research Group Professor Luo Yi set up a technology research group, in the LED lights on the optical system and cooling structure of a major breakthrough.
Research group first proposed a new design concept. The originality of the proposed Task Force will each tablet type LED of the output optical power distribution design standards for street lighting into an area with a consistent uniform rectangular illumination distribution. Research group headed by Professor Luo Yi developed a non-imaging optical system design theory, the definition of a novel method of optical mapping - mapping method of separation of variables, the numerical solution to the street this three-dimensional light distribution of a given problem. Meanwhile, three-dimensional surface modeling, the proposed three-dimensional surface by discrete modeling method, more accurate control of the shape of the lens surface, which is very simple and effective access to the ideal rectangular illumination distribution. On the basis of the above work with independent intellectual property rights obtained high light extraction efficiency, rectangular uniform distribution of power type LED illumination optical system package.
Dongguan Kingsun Group and Tsinghua University, Tsinghua University, have succeeded with independent intellectual property rights for the city's power type LED lighting package implementation and application of technology industry. Meanwhile, both sides jointly in high-efficiency, high reliability and intelligent cluster LED driver technology, a unique LED lamp assembly manufacturing industry has made significant progress in technology.
Tsinghua University developed a new ground on the group cut-off power type LED street light type lighting effect as the actual figure 1 (a) below. Tested in a rectangular illumination uniformity within the region up to 0.64, the light extraction efficiency of the optical system up to 84% or more, single white LED-based light-emitting efficiency of the power can reach 90 lm / W, road use than the current comprehensive energy-saving 60% of high-pressure sodium lamp above.
At present, the product has been successfully applied to the project in Guangdong Science Center, Tsinghua University, Olympic Stadium (see Figure 1 (b)), Changping Town, Dongguan, road lighting project, Shek Pai Town, Dongguan, comprehensive renovation project nearly ten thousand street lamps, Shilong Town, Dongguan more than 10,000 street lamps comprehensive renovation project, the Shenzhen district of Meishan Court saving lighting, new street lights, Zhongshan Torch Development Zone project, Zhongshan Torch Development Zone, road lighting, city lighting engineering, and achieved a good energy saving and lighting effects .
Figure 1 (a) new type of power type LED lights the practical effect of map
Figure 1 (b) applies to the Olympic stadium lights, Tsinghua University
It is estimated that if the country's roads are high-efficiency lighting, new LED lights, you could save 42 billion kWh of electricity, equivalent to saving 15.8 million tons of standard coal, close to several large production of coal a year. At the same time, not only to reduce the waste of water resources, and reduce the lives of people near the power station and plant growth of coal dust pollution caused by emissions of 4.7 million tons, reduce acid rain SO2 emissions 440,000 tons, therefore, of great economic, social and environmental benefits. (Department of Electronics, feed Xiang Hua edit)
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