In the past year, under the global environmental protection trend, the LED lighting industry has risen rapidly. Many technology companies have invested in this emerging industry. However, due to the failure of the LED lighting reliability performance standards to be set and properly regulated, a large number of products cannot pass the test and severe light decay. The main reason for this is that no theoretical research is designed to examine the pillars, thus causing doubts about the use of the owners, and thus delaying the opportunity for industrial development. LED lighting solutions supplier, Xinyuan Sheng Technology (Thermalking), provides high-performance LED street light components to the lighting system's important technical pointer specifications data for industry reference.
Guan Xinning Ph, Technical Director of Xinyuansheng Technology Co., Ltd. D
The key technology of LED chip and package component luminous efficiency, the key technology of LED chip and package component, European, Japanese and Japanese manufacturers have mass production breakthrough light efficiency of 100~120lm/W, surpassing the traditional highest efficiency HID light source (lighting efficiency) 90~110lm/W), solve the problem of the current total luminous efficacy of LED Lamps? 45lm/W problem, meet the long life of road lighting, low light decay, meet the international standard average illumination, up to 25~40Lux specifications and energy saving 30~60% demand.
Positive thinking on how to improve the reliability of LED road lighting
LED lighting efficiency, temperature rise and life specification key technical indicators, view the data published by CREE or OsramLED and other manufacturers, the chip PN junction operating temperature Tj <75 ~ 85 ° C, to ensure higher working efficiency than 85% light efficiency Up to 50,000 hours, and the temperature of the chip PN junction to its own thermal conductive sheet (Tjs) is between ???T=6~15°C, and the LED light efficiency is inversely proportional to the operating temperature. For every 10°C increase, It will lead to the serious consequences of light decay of 3~6% and half of life, and the general publicity LED can work at 100~125°C for more than 100,000 hours, but ignore the light efficiency loss caused under this condition. The concept of ~30% is a far cry.
Positive thinking on how to improve the reliability of LED road lighting
Positive thinking on how to improve the reliability of LED road lighting
LED street light system heat transfer cooling environment temperature key technical part, the operating temperature of such lamp system should not be higher than 85-10=75 °C; Taiwan LED road lamp specification CNS15233, durability test environment temperature is 50 °C, so street lamp cooling system The temperature rise must be less than ???T?25 °C. Taking Xinyuansheng Technology 150W LED street lamp as an example, the heat transfer system temperature rise test is as low as T?13°C, and its thermal resistance value Tr=0.08°C/W, while most industry manufacturers design system temperature rise. Test ???T?30~40°C, calculate its thermal resistance value Tr=0.2~0.26°C/W; under the same conditions, Xinyuansheng Technology's products will increase the life expectancy by 2 times and brightness compared with other manufacturers. Increase by more than 15%. In addition, with Xinyuan Sheng Technology 350W LED luminaire test, the temperature rise of the heat dissipation system can still reach ???T=15°C, and the thermal resistance value Tr=0.04°C/W.
Positive thinking on how to improve the reliability of LED road lighting
The key technology of heat transfer and heat dissipation of LED street lamp system, the heat transfer and heat dissipation method of electronic equipment are suitable for low-power natural heat dissipation method. At present, MR16/PAR30 is from 1~70W, and the system temperature rise has reached 30~40°C. If more than 100W still uses the natural heat dissipation method, just like most products on the market, a large amount of aluminum alloy material must be used to increase the thermal conductivity and the large heat exchange area. The volumetric weight is 2, 30Kg, which not only increases the cost of the lamp but also adds the light pole. The risk of safe suspension of the luminaire.
The law of natural heat dissipation is to reduce the temperature by using a metal material with a heavier area. The better the effect, but the cost of aluminum alloy material is increased by NT$60-200/kg. Some manufacturers claim that the heat pipe or loop heat pipe can be used. The heat dissipation effect only solves the heat conduction. Whether it is a heat pipe or a loop heat pipe, it has only the function of heat conduction and does not have the function of heat dissipation. To achieve good heat dissipation, it is necessary to use an effective heat dissipation area with a relative wattage, that is, a large area of ​​metal material must be added. To do heat exchange; otherwise, you must use the active forced cooling method used by high-end and high-power products such as industrial-grade high-reliability air-conditioner air conditioners and computer CPUs. The high-efficiency and military-sized small fan life guarantees 70,000 hours. IP65 waterproof and dustproof grade, plus appropriate originals such as heat pipes and heat-dissipating aluminum fins and reasonable mechanism design, the temperature rise of the tested lamp system can be as low as T?12~15°C, compared with the natural heat dissipation method. When the temperature is lowered by 25 °C, the life expectancy will increase by 2 times and the light efficiency brightness will increase by 10 to 15%.
Positive thinking on how to improve the reliability of LED road lighting
LED street lamp system reliability, durability environment adaptability test indicators, general LED Lamp product design does not consider the dust protection system, outdoor road lamps must completely prevent sandstorms, colloidal suspended matter, gravity dust accumulation in the heat dissipation structure, To avoid the problem of causing the LED to overheat and burn. If the heat dissipation structure faces the surface of the sky and causes dust accumulation, the heat accumulation cannot be dissipated, and LED light decay and burnout may occur. To solve the above problems, it is possible to design a heat dissipation structure to face the ground. Other anti-salt fog tests, etc., Xinyuan Sheng Technology's existing products after 20,000 hours of outdoor testing time, light failure <10%, in good condition. The optical design of the main road lighting can also reach the world standard, that is, the 10 meter high pole must illuminate the long surface of the banner 40 meters on average, and solve the difficult optical lens design to achieve the aspect ratio of 1:4. In addition, the core wick technology module has also achieved light weight, and does not need to rely on the lamp housing as a heat sink. Therefore, the external design of the lamp can be arbitrarily changed in shape to achieve the aesthetic characteristics of each city.
Positive thinking on how to improve the reliability of LED road lighting
As a high-tech energy-saving lighting industry practitioners must recognize that good lighting heat dissipation includes heat transfer, temperature uniformity, heat exchange and other complex heat transfer traditions based on hard theory, not the LED lights are cold light. Fever, but also seek to solve with a single original or special materials such as noble nanotechnology or aerospace technology. When the terminal customers look at the fog, they must face up to the performance of the LED street lamp. It must have scientific data, theoretical support, perfect system design method as the guideline, good process basis, and finally the test report in the third fair unit. Based on this, it will not happen again and again the vicious circle of light decline goods hindering the development of the industry. Taiwan Xinyuansheng Technology is willing to share the research results and patented technology with the world's peers for many years, including forced heat dissipation and downward heat dissipation. Invention patents such as liquid heat dissipation and dozens of new patents work together to illuminate the world.
In addition, the related technology development is explained: At present, each LED chip and packaging technology is continuously improved. Tj can withstand temperatures up to 100 ° C and the lifetime can reach 50,000 Hr or more. But the physical properties of silicon crystal materials can never be changed. "The luminous efficiency is inversely proportional to the temperature rise of Tj". The higher the temperature rise of Tj, the lower the light efficiency. Cree is set to 100% with Tj=25°C light efficiency; when Tj=75°C, the light efficiency is attenuated to 85%; when Tj=125°C, the light efficiency is attenuated to 70% (meaning that the new luminaire just completed has been reached L70, light decay 30%), so light efficiency and longevity can not be confused, mixed food and audio, LED factory deliberately stressed that their Tj can work at 125 ° C life up to 50,000Hr but not to remind the lighting factory designer if Tj = 125 When °C is the parameter, it will immediately lead to 30% light loss. Therefore, the world is committed to breaking through the key technology of “heat transfer heat dissipationâ€. The lower the temperature drop of Tj, the higher the light efficiency, the most can be achieved under this condition. Long life expects maximum competitiveness.
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