The key problem of LED street light is temperature, but LED street lamp is usually lost in this link. LED street lamp as the light emitting power more than domestic lamps, so manufacturers in the design of the cooling fins, the heat dissipation module base on pains, assembled in the outside light radiating module, plus paint protection to prevent climate erosion. But the external protective paint but the radiating module heat sealing and back, caused by poor cooling resulted in LED epitaxial decay.
Centralized heat LED epitaxial luminous energy belongs to a small range, in the application of high power street lamps, electric input power is also big, interface temperature of LED is quite high, in the street to work continuously for long time, if not effective heat radiating module, it will affect the service life of the LED and luminescent performance, as the current LED Street serious decay is caused by these factors. LED street lamp is used outdoors, the interference factors of environment and climate, so most of the manufacturers will be LED lamp radiator shell protection to the anode, or with spray paint, in order to avoid the erosion of acid-base substances. Anodic treatment of life is not long, the time long or slightly oxidizing discoloration, if you want to remove the heavy industries, not only time-consuming work will also increase the cost of maintenance; paint protection with low cost, protects it, but the general paint without cooling function, paint the body itself will form a barrier for use, is tantamount to increase thermal impedance LED street lamp radiator, not only does not help, but because of the heat sealed inside the radiator, let LED luminous power reduction, finally leads to serious decay.
Serious problems exist in LED lighting industry has been over, almost is the main reason the public works LED street lamp cannot smoothly through the procurement unit acceptance.
LED road lighting failure solutions:
To solve these existing problems, suggestions of street vendors from the basic material to solve, from high power LED heat source problem is from the inside out. For example in the light emitting component and the aluminum substrate bonding, thermal conductivity glue will play a key role, some manufacturers think better thermal conductivity of thermal conductive adhesive film or thermal plastic pad, film thickness must be thicker is better, but not want to thermal resistance problem. Thermal conductivity is again good, encountered resistance film thickness is of no use. Moreover, thermal conductivity glue film or soft thermal pads, and can not truly and substrate adhesion, surface fitting in fact there are many pore. These pores in the electron microscope to watch, like empty pockets, which is another form of thermal mass. In the presence of so many interference resistance of heat conduction, heat conductivity of intangible efficiency is reduced.
Use of conductive gel, soft ceramic thermal conductivity glue recommended. Soft ceramic thermal conductivity glue printing construction is different from the attaching type conductive adhesive film traditional porcelain, soft heat conduction glue is soft and semi liquid state, in the screen printing machine blade coating on aluminum substrate, conductive particles into the substrate surface porosity and to fill to the full. This will form a completely flat surface without pores, and LED epitaxial substrate bonding will close completely. Thus the thermal resistance is reduced to the minimum degree, heat can quickly be transmitted, naturally reduces the LED grain temperature, prolonging the life of epitaxial and greatly delayed light decay. In addition, because the soft thermal ceramic paint printing construction has the ductility, the high temperature baking or reflow soldering, will change along with the aluminum substrate thermal, stress is very small, will not cause the aluminum substrate warping, but will not burst plate.
In the external protection of LED lamp to recommend the use of LED lamp soft ceramic thermal paint. This kind of soft ceramic thermal paint can be sprayed directly to LED lamp outside, the construction is simple, can adapt to the radiating structure of various shapes, can also be adjusted to different color, the landscape design needs. Spraying soft ceramic particle heat paint, after nano processing, fine particles is not only easy to spray gun operation, also let the heat conducting particles with a coating area and more intensive, let the temperature volatile through scattered area also increased, so that the heat energy of LED lamp rapid conduction out. Soft ceramic thermal paint belongs to a thermosetting material, meet the safety standards of environmental protection RoHS, simple and no special equipment, after baking after long time high temperature thermoset, can not withstand LED qualitative problem. Outdoor use in the LED street lamp, landscape lamp, or LED advertising billboards, also will face expose to wind and rain, rain bird droppings, air dust, smoke emissions hELlip; acid-base damage etc.. So this kind of soft ceramic thermal paint must have the characteristics of acid and alkali resistance, the pH value in the range of PH3~11, can effectively protect the LED outdoor lamp appearance not be eroded.
The cost structure of LED lamp with the packaging technology, the carrier plate design, radiating module structure refinement development, continuously improve quality, reduced cost with the development of technology and market demand. But the investment is not much improvement in material manufacturers, this is mainly with the process of Taiwan industrial and commercial development and habits. Taiwan manufacturers than the design and fabrication process, in the material foundation research on inking less. So in solving technical problems or to reduce costs and other issues, preferred procurement thinking or production management thinking. But the vendors at the first time point, will think about it from applied materials, to reduce the cost from the perspective of innovation, improve quality and increase profit. |
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