We all know that the normal operation of the LED has a proper temperature premise, if the function of the LED beyond this temperature will be affected, if the temperature is not well controlled, it will lose the characteristics of the long life of the LED lamp.

How to export the heat of the LED chip! This is what the packaging process has to do, and many practices are to use metal materials at the bottom of the LED package to conduct heat. It is necessary to use aluminum substrate to quickly export the heat generated by the LED chip. Is the heat transfer function of all aluminum substrates the same? Is it the same that the heat generated by the LED can be quickly exported? What is the effect on the heat transfer of aluminum substrate? Is it the aluminum plate that determines the thermal conductivity of the aluminum substrate?

Do a simple introduction to the above topics: the thermal conductivity of aluminum substrate is definitely different! The speed of heat conduction is also different. This is affected by the aluminum substrate structure. Aluminum substrate is divided into 3 layers: one layer is copper, the second layer is thermal insulation material, the third layer is aluminum plate. The roles of these three layers are respectively; The first layer is used for electrical circuits (conducting electricity). The second layer is the hub, which plays the role of whether the heat generated by the LED can be quickly transmitted to the aluminum plate, which needs to know the thermal resistance of this thermal insulation material. The function of the third layer is to transfer the heat derived from the thermal insulation material to the lamp cup again. There is also an installation role. So we clearly know how to make the lamp cup better heat dissipation, because we understand the heat dissipation characteristics of the lamp cup. And there is no more attention to aluminum substrate, there is no more understanding. It is also thought that whether the heat conduction of the aluminum substrate is better is related to the thickness of the aluminum plate. But that's not the case. In order to improve the thermal conductivity of aluminum substrate, the most crucial thing is to improve the function of thermal insulation materials. The thermal resistance of the heat-conducting insulation material should be reduced. To reduce the thermal resistance of insulation materials is not a simple matter, he is affected by the material composition and manufacturing process.

At present, there are more smooth aluminum substrates on the market. Its process is to coat a layer of glue on the fiber cloth. The thermal resistance of such an aluminum substrate is 1.7 degrees Celsius /W, and some will be 3.2 degrees Celsius /W. The thermal resistance is relatively high, so its heat conduction is not very good. The heat transfer is also uneven. Not suitable for high quality, high brightness, high power LED lamps. To see that such a material is simple, you will see the grilles on the surface of the aluminum substrate when you look at the light. (A few years old product, of course cheap)

With the continuous development of LED chips, the power is constantly improving, and the heat dissipation is also getting higher and higher, so the aluminum substrate is also constantly developing. Now the thermal conductivity insulation material of the aluminum substrate can be made of jade glue, and the fiber cloth is not required, and the average pressing of high precision is made through the dust-free workshop. Since it's all rubber, you can't see the plaid. Can be compared with the United States, Japan's all-rubber aluminum substrate. And there is a great price advantage. Of course, it is slightly more expensive than the ordinary ones. At present, it is not possible to do this thermal insulation adhesive in China due to the influence of materials and processes. In this case, if the thermal insulation resistance of your aluminum substrate is too large, the heat generated by the LED can not be exported. The traditional aluminum substrate used in a single 1W in a short period of time is still OK, but compared to the good aluminum substrate on the body (will have more longevity than the traditional aluminum substrate). Traditional aluminum substrate to do more power must be considered. We all know that the cost of aluminum substrate only accounts for a small proportion of the cost of the entire LED lamp. You can spend a few cents more, a few dollars to make you dozens, hundreds, thousands of LED lighting quality is further guaranteed, in the future market competition through quality recognition. (The chip heat is better exported to the LED packaging company is also benefited).