With the relatively rapid advancement of LED technology and the improvement of cost performance, the development of LED in the lighting market has exceeded the expected progress. The tungsten filament bulb invented by Edison will face the challenge of being replaced after a hundred years. It converts heat by electric energy, and then produces wavelengths of 380 nm to 780 nm in visible light, which is accompanied by a lot of invisible light, such as infrared rays and ultraviolet rays, which cannot be used by humans.
The incandescent light bulb disappears because 85% of its electrical energy is converted into heat when it is illuminated. Only 15% is the light we actually feel, and the light source output efficiency is extremely low. The "Energy Conservation Promotion Program" of the Energy Bureau of the Ministry of Economic Affairs of Taiwan will stipulate that the incandescent bulbs will be completely withdrawn from public institutions, restaurants, hospitals, etc. in 2010. It is expected that traditional incandescent lamps that consume more electricity by 2012 will be completely banned from manufacturing. Import and sales.
Thanks to the gift of modern technology, today's lighting has undergone a new transformation, and semiconductor lighting is a future trend. Due to the breakthrough of LED's own light-emitting characteristics and optical technology, and the software control system, the multi-color exhibition is mature in the control end, and the special characteristics will be different from the general traditional lighting, and more suitable for different strict lighting. surroundings.
LED lighting products have long life, small size, instant flashing, rich light color, easy control of light source direction, small glare, low power consumption, energy saving, low UV, DC lighting and mercury-free pollution. It can be said to be safe. And environmental protection! So all walks of life have high hopes for LED, and there is a green lighting source, so all manufacturers are trying to develop LED-related lighting applications.
However, LEDs also have some problems that need to be solved, such as heat dissipation, high initial cost, and excessive directionality of the light source. The design of the luminaire requires further consideration of optical characteristics. Fortunately, these problems can be improved through continuous improvement of production methods and innovative design. At present, there are many laboratories and companies conducting relevant research.
At present, LED chips and packaging technologies are continuously improved. Tj can withstand temperatures above 100 °C and life expectancy can reach more than 50,000 hr. However, the higher the physical properties of semiconductor materials Tj, the lower the luminous efficiency." Cree is labeled Tj=25°C. The light efficiency is set to 100%; 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 newly completed lamp has reached L70 and the light decay is 30%). Therefore, the light efficiency and life cannot be confused. The LED factory emphasizes that their chips can work at Tj=125°C, and the estimated life is up to 50000hr. However, it is not mentioned that if the design of the lamp factory is based on Tj=125°C, it will lead to 30. % light loss.
In order to break through the key technologies of “heat transfer and heat dissipationâ€, Guanghai Technology has developed “COHS package heat dissipation technologyâ€. The lower the temperature of Tj is, the higher the light efficiency is, and the longest life can be achieved under these conditions. Only have the greatest competitiveness.
Guanghai Technology is committed to the development of heat dissipation technology by utilizing its own design advantages of carrier board. Guanghai directly encapsulates LEDs on copper bases with high thermal conductivity. Because of the high thermal conductivity of copper, it is like the role of radiators. In terms of circuit design, the advantage of the proprietary process is used to overcome the problem of adhesion between the insulating film and the copper material. This is called the Chips On Heat Sink.
Guanghai's "COHS heat dissipation technology" is different from the traditional COB packaging method, eliminating the need for unnecessary thermal resistance between the chip and the pedestal, and using copper with better thermal conductivity than aluminum as the substrate, and for 60W The above wick module adds the concept of a temperature equalizing plate, which can transmit heat more quickly. The advantages of this technology are: low thermal resistance of the module, easy control of the junction temperature, and measurement of the junction surface. Temperature test points, low-cost packaging structure, easy installation, good heat dissipation and so on.
The products of Guanghai Science and Technology have been applied in the Zhubei store of the living workshop, the LED streetlight project in Qingyun County, Shandong Province, the LED streetlight project in Daxing District of Beijing, and various indoor and outdoor lighting. I believe that in the near future, LED will lead the lighting. In the footsteps of industry, Guanghai can also participate in this exciting era of technological revolution.
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