How does LED street light dissipate heat
Solar LED street lights use thermally conductive materials in the heat dissipation mode, generally thermally conductive silicone grease. The cost of thermally conductive silicone grease is relatively economical and applicable, but it needs to be applied on the heat dissipation surface and the application area is large. The main problem is that the application thickness is thin. The difference is that the heat dissipation copper plate is in contact with the heat sink or the metal bracket lamp, and the metal shell. Now many LED lamp manufacturers use soft silicone thermal pads, which can be laid on a large area, easy to operate, and can effectively transfer heat to the heat sink. On the device. In addition, thermally conductive silica gel has the product technical characteristics of good thermal conductivity, softness, high compression ratio, self-adhesive surface, making installation conditions easier, and superior weather resistance and high pressure resistance. After use, the heat conduction effect can be significantly improved, the internal temperature of the device during long-term operation can be reduced, the service life of the LED lamp can be greatly increased, and the light attenuation can be reduced.
The solution to the heat dissipation of LED lights: To solve the heat dissipation of LED lights, we mainly start with two aspects. Before and after packaging, it can be understood as LED chip heat dissipation and LED heat dissipation for a long time. The heat dissipation of LED chips is mainly related to the choice and process of substrate and circuit. The heat dissipation of the LED lamp itself is because any LED will be made into a lamp, so the heat generated by the LED chip is always dissipated into the air through the shell of the lamp. If the heat dissipation is not good, because the heat capacity of the LED chip is very small, a little heat accumulation will make the junction temperature of the chip increase rapidly. If it is operated at a high temperature for a long time, its life will be shortened quickly. However, there are many ways for this heat to actually guide the chip to the outside air. Specifically, the heat generated by the LED chip comes out of its metal heat sink, first passes through the solder to the aluminum substrate PCB, and then passes through the thermal conductive glue 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 will have different options depending on the power size and the place of use. There are mainly the following heat dissipation methods: Aluminum heat dissipation fins: This is the most common way of heat dissipation. Aluminum heat dissipation fins are used as part of the housing to increase the heat dissipation area. Thermally conductive plastic shell: Fill the plastic shell with thermally conductive material during injection molding to increase the thermal conductivity and heat dissipation capacity of the plastic shell. Air fluid mechanics heat dissipation: Aero fluid mechanics uses the shape of the lamp housing to create convective air, which is the lowest cost way to enhance heat dissipation. Long-life and high-efficiency fans are used inside the fan lamp housing to enhance heat dissipation: low cost and good effect. However, it is more troublesome to change the fan, and it is not suitable for outdoor use. This kind of design is relatively rare. Heat pipe heat dissipation technology: The heat pipe uses heat pipe technology to conduct heat from the LED chip to the heat dissipation fins of the shell. This is a common design in large lamps, such as street lamps. Surface radiation heat treatment The surface of the lamp housing is treated with radiation heat: simply apply radiation heat dissipation paint, which can take the heat away from the surface of the lamp housing by radiation.
