Successful application of heat-conducting silica gel sheet in led industry

Thermal conductive silica gel sheet is mainly used between aluminum substrate and heat sink, aluminum substrate and shell, etc. Today we mainly introduce the successful application of thermal conductive silica gel sheet in the LED industry:

There are many kinds of LED lights. For indoor LED lights, thermal conductive silica gel sheet with relatively low thermal conductivity is generally used, which can reduce the cost of the product and meet the needs of the product itself. For outdoor high-power LED lights, such as street lamps, street lamps have much greater power than other indoor lights, in order to better heat dissipation. At the same time to improve the service life of the lamp, the thermal conductivity is generally higher than the heat conduction silica gel sheet.

Heat dissipation is the key problem to be solved by LED lights, and before this is a heat conduction process is the key.

The heat dissipation problem of high-power LED lighting source needs to be solved involves the following links:

1. Chip PN junction to epitaxial layer;

2, epitaxial layer to the packaging substrate;

3. Package the substrate to the external cooling device and then to the air.

First of all, understand the design of LED heat dissipation: LED heat dissipation is actually a system engineering including many links.

1. LED chip package cooling design;

2. The LED light source is fixed in the heat dissipation position of the light source cavity;

3. Heat dissipation design of the driver of LED lamps;

4, LED lamp shell cooling design, these cooling design links are indispensable, if one of the problems often this lamp is a design failure.

At this time, thermal conductive silica gel sheet plays a great role. The heat conductive silica gel sheet must be used in the heat dissipation of high-power LED lamps. At present, the most commonly used and simplest method is to use thermal conductive silica gel sheet or thermal grease to conduct the heat generated by the LED light source to the radiator, and then use the area of the radiator for thermal radiation heat dissipation and air cooling heat dissipation.

LED lamp heat dissipation: The solution of single LED heat conduction is not equal to the solution of lighting lamp heat dissipation. With the development of high-power, large-size and high-brightness chips, the heat dissipation of LED devices and lamps must be solved. The thermal conductivity material used in the traditional heat dissipation mode is thermal conductive silicon grease. The thermal conductive silicon grease will be economical in cost, but it needs to be applied in a large area, which has a big problem and cannot be evenly applied. Heat dissipation copper cladding and heat sink or metal support lamp, metal shell contact, now many LED lamp manufacturers use GLPOLY soft thermal conductive silica gel sheet, can be a large area of bedding, easy to operate. The thinnest can do 03mm, the thickest can do 15mm. And the compressibility can reach 25%-30%. The greater the compressibility, the more the thermal conductive silica gel sheet is affixed, the more effectively the effective contact area can be increased and the heat can be transferred to the heat dissipation device quickly.