Technical principle
The main design of traditional LED street light design focuses on the lumens of LEDs, while the heat dissipation is less concerned. In fact, the lumens of LEDs are rapidly increasing. The single-watt lumens of mass-produced LEDs in 2009 have reached 100 lumens, and this number is growing rapidly. The corresponding theoretical theory of heat transfer has matured, and the heat transfer methods we can use are also basically clear: conduction, convection, radiation and phase change heat transfer. Therefore, the measures we can take on heat transfer or heat dissipation are visible and limited.
LED street lamp cooling technology, generally used as a heat conduction plate method, is a 5mm thick copper plate, which is actually a temperature equalizing plate, the heat source is evenly warmed off; there is also a heat sink added to dissipate heat, but the weight is too large. The weight is very important in the street lamp system, because the street lamp is 9 meters high. If it is too heavy, the danger will increase. Especially in the case of typhoons and earthquakes, accidents may occur. Domestic manufacturers adopt the world's first needle-shaped heat dissipation technology, needle-shaped radiator. The heat dissipation efficiency is much higher than that of the traditional chip radiator, which can make the LED junction temperature lower than the ordinary heat sink by more than 15 °C, and the waterproof performance is better than the ordinary aluminum profile radiator, and the weight and volume are also improved. . In addition, the graphite heat sink developed for high-power LED lamps also has good thermal and thermal performance.
The main methods of heat dissipation include: natural convection heat dissipation, forced cooling of the installed fan, heat pipe and heat dissipation of the loop heat pipe. Adding a fan to force the heat dissipation system is complicated, the reliability is low, and the heat pipe and the loop heat pipe heat dissipation method are high in cost. The street lamp has the advantages of outdoor nighttime use, the heat dissipation surface is located on the side, and the body shape is restricted, which is beneficial to the natural convection heat dissipation of the air. Therefore, it is recommended that the LED street lamp select a natural convection heat dissipation method as much as possible.
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