Solving the heat dissipation of LEDs mainly starts from two aspects. Before and after packaging, it can be understood as cooling of LED wafers and heat dissipation of LED lamps. The heat dissipation of the LED wafer is mainly related to the selection and process of the substrate and the circuit. This article mainly introduces the heat dissipation of Led lamps, because any LED will be made into lamps, so the heat generated by the LED wafers will always be dissipated into the air through the outer casing of the lamps. If the heat dissipation is not good, because the heat capacity of the LED wafer is small, a little bit of heat accumulation will cause the junction temperature of the wafer to increase rapidly. If it is operated at a high temperature for a long period of time, its life will be shortened very quickly. However, there are many ways in which this heat can actually lead the wafer out to the outside air. Specifically, the heat generated by the LED wafer comes out of its metal heat sink, first through the solder to the PCB of the aluminum substrate, and then through the thermal adhesive to the aluminum heat sink. Therefore, the heat dissipation of LED lamps actually includes two parts: heat conduction and heat dissipation.
However, the heat dissipation of the LED lamp housing may have different options depending on the power level and the place of use. There are mainly the following cooling methods:
1. Aluminum fins: This is the most common way to dissipate heat, using aluminum fins as part of the enclosure to increase heat dissipation.
2. Thermally conductive plastic case: Fill the thermal conductive material when the plastic case is injected, and increase the heat conduction and heat dissipation capability of the plastic case.
3. Air hydrodynamics uses the shape of the lamp envelope to create convective air, which is the lowest cost way to enhance heat dissipation.
4. The inside of the fan lamp housing uses a long-life and high-efficiency fan to enhance heat dissipation, which is low in cost and good in effect. However, it is more troublesome to change the fan, and it is not suitable for outdoor use. This design is rare.
5. The heat pipe uses heat pipe technology to conduct heat from the LED wafer to the heat sink fins of the case. This is a common design in large luminaires such as street lights.
6. Surface radiation heat treatment The surface of the lamp housing is radiated and heat-dissipated. The simple method is to apply Zhisheng Weihua radiation heat-dissipating paint, which can radiate heat away from the surface of the lamp housing.
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