LED lighting business cakes, continued to be concerned by all relevant manufacturers in 2011, from the most upstream epitaxial luminous efficiency, LED power management or dimming design to the thermal design of LED lamps, have become the focus of manufacturers research and development, which for LED What is the most important effect of luminous efficiency is the heat dissipation effect of LED lamps.
As the power increases, the waste heat generated by the LED heat flow cannot be effectively dissipated, resulting in a serious decline in luminous efficiency. According to the DIGITIMES report, the effect of temperature on brightness is linear, but the effect on life is exponential, also The junction temperature is correct. If it is kept below 50 °C, the LED has a service life of nearly 20,000 hours. At 75 °C, there is only 10,000 hours of service life, 5,000 hours at 100 °C, 2,000 hours at 125 °C, and 150 °C. 1,000 hours. The temperature light is changed from 50 °C to twice the 100 °C, and the service life is shortened to the original one-fourth, so the heat will greatly affect the service life of the LED. This article will discuss the heat dissipation of the LED lamp from the heat-dissipating coating and the shell design. .
When LED is used as the light source of the lamp, the design of the casing of many lamps will over-emphasize the conduction link in the heat dissipation technology, but ignore the convection heat dissipation. Many manufacturers have designed various heat dissipation modules such as heat pipes, loop heat pipes, and heat conduction. Rouge, etc., did not notice that the heat ultimately relies on the external surface area of ​​the lamp to dissipate the heat. As a result, the heat will remain in the lamp housing, and the temperature of the overall LED lamp will rise, which will eventually affect the luminous efficiency of the LED. In view of this, Yuliang Optoelectronics specially focuses on the heat convection when designing the LED lamp housing, and increases the air flow rate by the columnar structure, so that the heat transmitted from the epitaxial layer to the lamp housing can be smoothly utilized by the heat convection. in the air.
Qin Jiaqian, director of research and development of Yuliang Optoelectronics, stressed that the outer casings of their LED products are formed by die-casting. Qin Jiaqian said that many manufacturers of LED lamps on the market will choose to form by stamping on the outer casing, but the stamping will be 2 The aluminum sheets are not assembled in one piece. It is worried that the "aluminum" will be deformed after thermal expansion and contraction, and it is easy to have the risk of dispersion. Therefore, Yuliang Optoelectronics abandons the cheaper stamping and selects the higher cost die casting to give consumers more High use guarantee.
LED thermal solution In addition to considering whether to install heat sinks, fans or use heat pipes to dissipate the heat source, the manufacturer will also add a layer of heat-dissipating paint on the aluminum heat sink to make the LED heat dissipation faster. The heat-dissipating coating is a ceramic powder or a metal powder added with a binder and a micro-nano grade in an organic solvent, uniformly mixed, and then coated on the surface of the aluminum heat sink by a spray gun or a immersion method, dried or dried on the surface. It is coated with an adhesive porous ceramic film (thickness of about several tens of micrometers). These ceramic powders are alumina, zinc oxide, titanium oxide, boron nitride, tantalum carbide, and the like. This part of Yuliang Optoelectronics uses the special nano-coating of Japan's Okitsumo, which uses heat radiation to conduct hot air into the air. This product is also recognized by Japanese Hino trucks, and all Hino truck water tank copper tubes use this heat-dissipating paint.
Although LED products are not currently popular in life, but optimistic about the trend of green energy in the future, Taiwanese manufacturers have poured into this industry like the river, but it is not only Taiwan that looks like LED, but neighboring South Korea is also eyeing. Li Bingjie, chairman of Jingdian, pointed out that South Korea's LED factory quickly jumped into the market and affected the global LED supply map. Recently, Samsung announced that it will invest 23 trillion won (about 18.8 billion US dollars) in the next 10 years to develop LED business. Taiwan's LED industry must be integrated. In order to enhance overall competitiveness. Whether the LED market can be expected to rush out of good results may still depend on the development of LED lighting.
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