The heat dissipation technology of led street lamp head

For the heat dissipation technology of LED street lamp heads, the heat transfer plate method is generally used. A 5mm thick copper coin, in fact, even if it is a temperature equalizing plate, it can heat all the pyrogens; there are also modified heat sinks to dissipate heat, but the net weight is very large. . The net weight of the street lamp head system software is very important. Generally, the street lamp head is six meters high. If it is too heavy, the risk will increase, especially when it encounters a strong typhoon or earthquake disaster, it will cause accidents. In my country, some manufacturers choose the global innovative fibrous heat sink heat dissipation technology, and its heat dissipation rate is greatly improved compared with traditional built-in heat sinks, which can reduce the junction temperature of LEDs by more than 15°C compared with ordinary aluminum heat sinks, and Compared with the general aluminum alloy profile radiator, it has stronger moisture-proof characteristics, and at the same time, the net weight and size are also improved. Including: of course thermal convection heat dissipation, enhanced forced heat dissipation of fans, heat dissipation pipe heat dissipation, heat dissipation of control loops, etc.

The compulsory heat dissipation method of the centrifugal fan has complicated system software, low stability, and increased costs for the heat dissipation method of the radiator pipe and the control loop. In addition, street lamp heads have the advantages of being used outdoors at night, side heat dissipation surface and body shape are small, which are beneficial to gas and heat convection heat dissipation. Therefore, LED street lamp heads are strongly recommended to choose natural heat convection heat dissipation methods as much as possible. The total area of ​​the heat sink of the LED street lamp head is set at will, the layout of the heat sink is unscientific, and the arrangement of the heat sink fin type does not fully consider the application method of the lighting fixture, which endangers the full use of the heat sink, although many manufacturers have considered various countermeasures : Heat pipes, control loop heat pipes, heat-conducting silica gel, etc., but pay attention to the heat conduction stage and ignore the heat convection heat dissipation stage.

However, if the heat is not realized, it depends on the total surface area of ​​the lighting fixture to dissipate. Ignoring the efficiency of heat conduction, if the temperature of the plate-fin type is more severely uneven, it will cause a part of the plate-fin type to fail or be very effective. More limited. It can be said that heat dissipation is the core problem that LED street lamp heads must deal with. LED is a semiconductor material, and only 15% to 25% of electromagnetic energy is converted into solar energy during its operation, and the other electromagnetic energy is basically converted into energy, which causes the ambient temperature of the LED to rise. In high-power LED street lights, heat dissipation is also a problem. If the LED street lamp head does not require heat dissipation measures, the core temperature of the high-power LED will increase rapidly. When the junction temperature rises beyond the maximum allowable temperature, it is generally 150°C, and the high-power LED will cause the temperature to be too high. destruction. In the design of high-power LED lamps, the key formulation work is the heat dissipation design. Because the chromaticity of LED street lamps needs to be high, and the natural environment of the application is relatively harsh, if the heat dissipation treatment is not good, it will quickly cause the embrittlement of the LED and reduce the reliability. Nowadays, after the LED light source is energized, about 30% of the electromagnetic energy is converted into solar energy, and the remaining part is converted into energy. Therefore, it is necessary to design the heat dissipation structure of the LED lamp as soon as possible. The important new technology is the design of the LED lamp heat dissipation structure. The energy must be based on heat , Convection heat transfer, radiant heat to release. It is necessary to let the LED lamp dissipate heat as quickly as possible to effectively reduce the heat dissipation temperature of the LED lamp cavity, protect the switching power supply from working under long-term high temperature conditions, and prevent the LED light source from aging due to long-term high temperature work.

And the LED lamp heat dissipation production and processing are simple, and its forming cycle time can be reduced by 20-50%, which also reduces the output power of the LED lamp heat dissipation cost. To manufacture high-quality led road street lights, we must first do a good job in the heat dissipation design of the lighting fixtures. Only by solving the heat dissipation problem, the long life advantage of the led road street lights can be achieved. Therefore, the heat dissipation problem is a crucial issue that high-quality light bulbs must deal with. There are two specific heat dissipation methods for led road street lamps used today: one is passive heat dissipation, and the other is active heat dissipation.