The design challenges encountered in high-power LED lighting solutions are heat dissipation design and overheat protection. The power and thermal management system required by the LED light source, because compared with other light sources, most of the electrical energy provided to the LED is converted into heat. Without proper thermal management, this kind of heat will affect LED life and color output. Solving the heat dissipation problem of LED lamps is an indispensable link in lamp design.
The thermal conductive materials commonly used in LED lamps are mainly divided into:
Structural thermally conductive materials and filling thermally conductive materials. In addition to the function of the structural heat-conducting material as the housing of the lamp, it also doubles as the heat dissipation of the LED light source, such as thermally conductive plastic. The filling thermal conductive material is mainly used between structural thermal conductive materials, as the connection between the two, because the thermal conductivity of the thermal interface material relative to the heating element and the metal heat sink is low, so the choice of the thermal interface material is also very good. Crucially, this determines the speed of heat transfer.
The following are several thermal interface materials used in high-power LED solutions:
1. Thermally conductive silicone grease: It has excellent thermal conductivity, electrical insulation, stability in use, high and low temperature resistance, etc. It is currently a commonly used thermal conductive material for high-power LED lamps;
2. Thermally conductive silicone sheet: fill the air gap between the heating element and the heat sink or the metal base to achieve the heat transfer between the heating part and the heat dissipation part, and also play the role of insulation and shock absorption, which can meet the miniaturization and ultra-thin The design requirements of modernization and the ease of use are unmatched by thermal grease;
3. Thermally conductive double-sided adhesive: bonding between the heating fin and the heat sink, simple and convenient to use, which helps to improve production efficiency.