How to solve the LED light failure problem

LED lights decay the key issue is the temperature, but LED street lights usually fail in this part. LED street light because of the luminous power is greater than the household lamps, so manufacturers in the cooling of the substrate fins, cooling module design painstakingly, the assembly is completed outside the lamp cooling module, add paint protection against weather erosion. Unexpectedly, the external protection of the spray cooling the heat of the module has been sealed back, resulting in poor heat dissipation LED epitaxial light failure.

LED epitaxy luminous energy belongs to a small area of ​​concentrated heat, high-power street lamp applications, the power input power is large, the temperature of the LED interface is quite high, the lamp for a long time continuous work, if the cooling module can not effectively heat, Will affect the LED life and luminous performance, such as the current LED lights serious light decline is caused by these factors. LED lights are used outdoors, there are environmental factors interference, so most of the manufacturers are LED lamp radiator shell to protect the anode processing, or spray paint to prevent the erosion of acid-base substances. Anodized life is not long, the time will be oxidized or slightly longer, if you want to remove the heavy industry, not only time-consuming and labor will increase maintenance costs; lower paint protection costs, the effectiveness of protection is good, but the general paint without heat Function, the paint itself will form a barrier, which is equal to increase the thermal resistance of LED street lamp radiator, not only did not help, but because the heat blocked in the radiator, so that LED light power is reduced, and finally lead to serious light failure.

The above has been in the LED lighting industry serious problems, almost the current public works LED lights can not be successfully passed the purchasing unit acceptance of the main reasons.

LED street light failure solution suggestions:

To solve these existing problems, it is recommended that street lamps manufacturers start from the basic materials to solve the problem of high-power LED heat source from the inside out. For example, in the light-emitting components and the bonding of aluminum substrates, thermal plastic play a key role, some manufacturers think thermal conductivity of thermal plastic film or thermal pad is better, the thicker the thicker the better, but did not think the thermal resistance. Even better thermal conductivity, thermal resistance encountered film thickness is useless. Not to mention the thermal plastic film or soft thermal pad, and can not really close with the substrate, the surface in fact, there are many bonded pores. These pores, viewed under an electron microscope, look like hollow cavities, which is another form of thermal resistance. In the presence of so many thermal resistances that interfere with thermal conduction, the efficiency of thermal and thermal conduction is virtually diminished.

To use the thermal plastic, the recommended thermal conductivity of soft ceramic. Screen printing construction of thermal conductive adhesive is different from the traditional thermal plastic bonding film, soft thermal conductive adhesive is a soft semi-liquid state, the screen printing machine scraper coated aluminum plate, the thermal particles will penetrate the surface of the pores and Fill to full. This will form a completely flat surface without voids, and LED epitaxial carrier will be completely bonded when bonding. As a result, the thermal resistance is reduced to a minimum, the heat can be quickly conducted out, naturally reducing the LED die temperature, but also extend the life of epitaxial and significantly slow down the occurrence of light failure. In addition, due to the scalability of the screen printing of thermal conductivity of soft ceramic ceramic paint, baking or reflow at high temperature, with the thermal expansion and contraction of the aluminum substrate together, the stress is very small, will not cause bending of the aluminum substrate, not even Will burst.

In the external protection of LED lamps recommend the use of LED lamps soft ceramic heat paint. This spray-type soft ceramic heat-emitting paint can be sprayed directly on the outside of LED lamps, construction and operation is simple, can adapt to various shapes of the cooling structure, can also be adjusted into different colors, landscape design requirements. Sprayed thermal paint within the soft ceramic particles, is through the nanotechnology, the particle is not only easy to spray gun operation, but also on the same coating area of ​​the thermal conductivity of the particles and more dense, so that the temperature volatilization of the area has become larger, Let LED lamps heat conduction quickly out. Soft ceramic heat-dissipating paint belongs to the thermosetting material, comply with RoHS environmental protection safety norms, the construction process is simple and does not require any special equipment, after baking heat, can withstand long-term high temperature LED will not have qualitative problems. Outdoor use of LED lights, landscape lights, or LED advertising billboards, will also be faced with wind and rain, acid rain guano, air dust, black smoke and so on acid-base damage. Therefore, this spray-type soft ceramic paint must have anti-acid properties, the current range of anti-PH value of PH3 ~ 11, LED exterior lighting can effectively protect the appearance of not be eroded.

Cost structure of LED lamps With the packaging technology, carrier design, cooling module structure of the sophisticated development, continuous improvement of quality, cost also with the technological development and market demand and decline. However, there are not many manufacturers involved in material improvement. This is mainly due to the process and habits of Taiwan's industrial and commercial development. Taiwanese manufacturers in the process and design, research and development of materials based on less ink. So in solving technical problems or reduce costs and other issues, more biased purchasing thinking or thinking. However, as the first time, the United States and Japan manufacturers will think about application materials, reduce costs, improve quality and increase profits from an innovative point of view.