LED street light failure serious issues that require cooling technology from led fundamental to solve. At present China is higher than the national growth of LED lights, according to statistics predict 2013 will continue dominating the global market first. Last year, Chinese Ministry of Science and finalized "Ten City, ten thousand," semiconductor lighting application engineering pilot policy, although the policy through the central market demand created a model of economic development, but on the actual manufacturers take the case of the first line of response was as expected.
Policy and market gap, in addition to the standard has not been completely standardized for LED manufacturers to follow, another technical problem is lurking "LED street light seriously bad light", leading to installation of LED lights can not be less than a year through the use of units of certification acceptance. LED aforementioned standards to develop a unified problem, there may be finalized in the near future elaboration, as "LED lights seriously bad light" from the LED heat dissipation technology needed to solve the fundamental.
LED street light failure genesis
Temperature is actually failure LED street light key issues, but why LED lights on the card in this link. LED street light power is greater than the household lamps, so the manufacturers in the cooling fins substrate, cooling module is painstakingly designed, assembled modules need heat lamps outside, plus paint protection against weather erosion. Unexpectedly, the external protection of the paint yet another heat sealed cooling module back, resulting in poor heat causes the LED epitaxial lumen.
LED epitaxy emitting energy belongs to a small range of concentrated heat in high power street lamp application, the electrical power input is also large, LED interface temperature is quite high, and continue to work in the street for a long time, the cooling modules if they can not dissipate heat effectively, it will affect LED life and luminous performance, like the current serious light failure LED lights is that these factors caused the accident. LED street light are used outdoors, there are environmental and climatic confounding, so most manufacturers is to LED lights radiator shell with anodized protection, or add spray paint, in order to avoid the erosion of acid substances. Anodized, life is not long, a little longer time, or will oxidize color, if you want to remove heavy industry, not only time-consuming and labor will increase maintenance costs; paint protection costs are lower, the effect is good protection, but generally no heat paint function, lacquer body itself will form a barrier effect, tantamount to increase LED lamp heat sink thermal resistance, not only did not help, but because of the heat energy blockages in the radiator, so that LED light power is reduced, and finally lead to serious bad light. These LED lighting industry has been seriously troubled existence, almost LED lights can not currently public works procurement unit passed inspection the main reason.
LED street light failure settlement proposals
To solve these existing problems, suggestions street vendors start from the basic material, from the inside out from the fundamental solution to the problem of high power LED heat. For example, the light-emitting components and aluminum plate bonding, the thermal plastic to play a key role, and some vendors that film thermal conductivity or thermal cushion is better, the film thickness to the thicker the better, no one would like to thermal problems. Better thermal conductivity, thermal resistance across the film thickness is useless. Moreover, thermal film or soft thermal pads, and can not really close together with the substrate, the bonding surface of fact, there are many pores. These pores viewed under the electron microscope, as is empty cavitation, which is another form of thermal mass. In so much interference exists under heat conduction resistance, thermal conductivity virtually efficiency is reduced.
To use for low thermal resistance thermal plastic, recommended the construction of the soft screen printing ceramic thermal plastic. Screen Printing Soft ceramic thermal plastic construction differs from conventional thermal paste-formed film, soft ceramic thermal plastic is soft semi-liquid, in the Screen Printing blade coating on aluminum plate, the thermal conductivity particles will penetrate the pores of the substrate surface and I padded to the full. This will form a completely flat plane without pores, and the LED epitaxial bonding carrier board will completely seal. Thus put to minimize thermal resistance, heat can be conducted away rapidly, reducing the LED die naturally ambient temperature, but also prolong the life of epitaxy and a substantial delay the occurrence of bad light. Furthermore, since the construction of the soft screen printing ceramic thermal paint malleable or baking at high temperature reflow when the thermal expansion and contraction together with the aluminum plate changes, stress is very small and will not cause aluminum plate warped, but do not will burst plate.
External protection in the LED lamps LED lamps recommended soft ceramic heat paint. This soft ceramic heat paint spray can be sprayed directly on the LED lamps outside, the construction is simple, can be adapted to various shapes of cooling structure, but also adjust to a different color, in response to the needs of landscape design. Spray paint inside the cooling soft ceramic particles is the result of nano-processing, fine particle spray gun operation is not only easy, but also to the same area of the thermal conductivity of the coating particles are many and dense, so that the temperature volatile scattered through the area is also larger, LED street light allow rapid heat conduction out. Soft ceramic paint is heat thermosetting materials, RoHS environmental safety norms, the construction process is simple and without any special equipment, after baking thermosetting, the LED can withstand high temperatures for a long time there will be no qualitative change problem. For outdoor use LED lights, landscape lights, or LED advertising billboards, will also face the wind and rain, acid rain, bird droppings, airborne dust, smoke emission hELlip; etc. pH violations. Therefore, this spray-painted soft ceramic heat must have anti-acid properties, the current anti-pH range of PH3 ~ 11, can effectively protect the LED outdoor lighting appearance is not being eroded.
LED lamps cost structure with packaging technology, carrier board design, the development of sophisticated cooling module structure, quality and continuous improvement, cost as technology development and market demand decline. However, improvements in the material inputs are not many manufacturers, mainly with the history of Taiwan's industrial and commercial development and habits related. Taiwanese manufacturers longer process and design inked on basic research and development in the material less. So in solving technical problems or issues such as reducing costs, in favor of purchasing health management thinking or thinking. However, manufacturers in the United States and Japan first point in time, from Applied Materials up thinking from the perspective of innovation to reduce costs, improve quality and increase profitability.
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