LED Lamp Cooling Design

- Jul 20, 2017 -

We all know LED lights, LED (Light-Emitting-Diode Chinese meaning light-emitting diodes), is a kind of energy can be converted into visible light semiconductor, it changed the incandescent tungsten light and energy-saving lamps three primary colors of light principle , While the use of electric field light. According to the analysis, LED features are very obvious, long life, high luminous efficiency, no radiation and low power consumption. LED spectrum almost all concentrated in the visible light band, the luminous efficiency of up to 80 ~ 90%.

 

However, LED lamp production needs more technical difficulties Oh, one is the choice of LED. Now the general brightness of the LED is difficult to reach a certain degree, and the lights are strictly required light and the corresponding point of the illumination. For car headlights:

 

It is necessary to optically design according to the standard requirements of light, including LED brightness, beam distribution, beam angle, etc. to choose the design. Although the LED can save energy and small size, but its beam angle is narrow, the requirements of the LED heat treatment is higher, so led for the light when the light treatment to pay special attention. The other is the heat treatment of the LED, if the heat to do bad, not only will affect the life of LED, LED will also cause light in the device light attenuation, based on these two restrictions, LED lights have not been very good Development, only some high-end car assembly. Production of LED quality control and light distribution verification.

 

For the car lights, compared to the headlamps, the signal requirements are relatively simple. But mainly to solve the problem of uniform light LED, that is, how to make LED output light evenly distributed, and a good solution to LED cooling problems. LED lights produced after the need to do some of the corresponding institutions to do performance testing and 3C certification, and now the state mandatory requirements through the 3C certification.

 

The LED is through three ways of cooling, conduction, convection and radiation, commonly used is the conduction mode, that is, the use of radiator. LED car lights on the market using three kinds of heat dissipation material: thermal plastic, aluminum and ceramics. Thermal plastic flammable, aluminum radiation, ceramic heat the best.

 

Then for the well-known LED heat dissipation in three ways, conduction, convection and radiation. In the high-power LED thermal design, the industry generally in the conduction effort, but only rely on conduction has reached the limit, the radiator temperature is difficult to reduce. Of course, fan fan cooling program, because the life is short, unreliable. Then the convection heat can only rely on the day to eat, the wind is hot, no heat to talk about the heat. Radiation cooling, we can find from the relevant forum, are not reported hope. There are experts from the theoretical proof of radiation heat dissipation only less than 1% of the total heat, naturally can not be used. In fact, radiant heat is everywhere. Above the ambient temperature of the object, 70-85% of the heat is radiated out. Then radiation heat can be in the LED?

 

In recent months, with the idea of trying to try the test of Taiwan and the mainland three kinds of radiation cooling paint. With the existing silicon pad heat conduction LED lights do reference material, the test sample is coated with three kinds of paint on the substrate, instead of silicone pad. Test results, three kinds of paint heat dissipation than the silicone pad, radiator temperature 2-30 ℃. Of course low 2-30 ℃ practical value is not, so continue to take the paint to play a greater role in the heat dissipation measures. Even found in the ambient temperature of 300 ℃, the radiator temperature is only 140 ℃, LED manufacturers to meet the requirements. This test uses a ZS-411 coating.

 

Using the same street lamp design, the substrate is replaced to optimize the substrate. Optimize the substrate double-sided coating, the ambient temperature of 30 ℃, the radiator temperature of 440 ℃, cooling more than 140 ℃. Comparison of the above temperature data, optimize the substrate positive and negative brush on both sides, than the non-coating substrate, radiator temperature 3-40 ℃. Whether the radiator brush on the radiator temperature has no effect, in this lamp can be eliminated radiator brush coating program. Optimization of the existing substrate design should also be improved, you can increase the cooling area, the use of substrate radiation will make the LED headlights better heat dissipation.


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