High-brightness light-emitting diode ( led power ) for its small power consumption, long life, fast response, no flash, small, non-polluting, easy and integrated features, is becoming the traditional lighting industry upgrading to a new generation of light. In energy saving, environmental protection have become an increasing concern today, semiconductor lighting is to become the new economic growth point, and thus attaches great importance to by governments around the world, the scientific community and industry. To date, the United States, Japan, Europe, mainland China and Chinese Taiwan, etc. have been introduced to the respective semiconductor lighting plans, high power (led power 10w) lighting industry has become one of the most watched industry.
It is noteworthy that, so far upstream epitaxial silicon technology has been mature and stereotypes, cheap LED Driver 30W 12-24V chips have been able to meet the needs of the lighting, the transfer and development of pricing forward midstream terminal market of packaging and downstream applications. This means that who-chip applications, to create a long-life, high-efficacy power LED lighting products, who is likely to become the ultimate winner of the LED industry. High power LED lighting package and the application of the problems have become prominent, one of the most critical is how to solve the heat problem of led driver 30w , this is not only the technical aspects of structural design and engineering applications, but also involves the thermal management mode and fluid mechanics, and other scientific issues. Completely different with the three-tier structure of the existing chip aluminum plate and a heat high-power 50w led power series lighting technology, we developed an integrated chip integration of a cooling (two-story structure) high power LED lighting series lamps "in the technology roadmap The revolutionary and subversive significance, will become a new direction of development of high power LED lighting industry.
A high power LED lighting product status
At present, the LED Power Supply 100W luminous efficiency can make about 30% of the energy converted into light, the remaining 70% of the energy is almost converted into heat, so that the LED temperature. Its heat is very small, low-power LEDs, basically do not have to take cooling measures can be applied, such as instrumentation lights, lights, small-size LCD screen backlight source. When applied to the field of commercial buildings, roads, tunnels, mining and other lighting for high-power LED, the heat is a big problem. If the heat of the LED chip can not spread it out, will accelerate the aging of the chip, the light fades, color offset, shortening the life of the LED. Therefore, the structure model and thermal management design of high power LED lighting system is very important.
All high-power LED lighting on the market today are made of chip aluminum plate heat sink three-tier architecture model ", that is the first chip package formed aluminum panel LED light source module, and then the light source module is placed on the radiator manufactured high-power LED lighting.
It should be noted that the high-power led driver 120w thermal management system still used in the LED early for lights and display lights, small power LED thermal management mode. Chip aluminum plate heat sink three-tier architecture model "Preparation of high-power LED lighting, there are obviously unreasonable in terms of system structure, such as the structure between contact resistance and high junction temperature, low thermal efficiency, so the chip The heat released can not be effectively export and shed be in the path, leading the LED lighting light efficiency is low, the light fades, life is short and can not meet the lighting needs.
How to improve the package thermal capacity is one of the key technologies of this stage, high-power LED to be solved. The direction and focus of the development of LED lighting products are: high power, low thermal resistance, higher light, low light, small size, light weight, thus making the cooling efficiency of the LED's have become increasingly demanding.
However, due to the restrictions of the structure, cost and power consumption and many other factors, high power LED lighting is difficult to use active cooling mechanism, but only the use of passive cooling mechanism, but the passive cooling has greater limitations; and LED energy conversion efficiency than low, is still about 70% is converted to heat, even if the luminous efficiency to 1 times 40% of the energy into heat. In other words, it is difficult to do not consider the extent of heat dissipation, so in the long run, the cooling of high power LED lighting is a long-standing problem.
The timing of high-power LED for lighting is now mature, and the development of efficient natural cooling thermal management systems, has become a high-power LED lighting to achieve the prerequisite and key factors of industrialization. Therefore, new technologies routes and system architecture to completely solve the cooling problem of high power LED lighting.