Error analysis of LED heat dissipation

LED errors are mainly reflected in the following areas:

1 internal quantum efficiency is not high

That is, when the electrons and holes are combined, they can not produce photons by 100%, which is usually called "current leakage", which reduces the recombination rate of PN carriers. Leakage current multiplied by the voltage is the power of this part, which is converted into heat, but this part does not account for the main component, because the current internal photon efficiency is close to 90%.

2 the photons produced in the interior can not be sent to the outside of the chip, and finally to the heat

This part is the main reason, because this is called the external quantum efficiency is only about 30%, most of them into heat.

3 over reliance on thermal conductive materials

Because of the use of what you can put off the heat of high-tech materials. In fact, the use of ordinary aluminum heat, after many tests, the temperature of the heat sink is only higher than the bottom of the radiator 3-5 degrees celsius. In other words, if you can use a very good thermal conductivity of the material, in the case of zero thermal resistance, you can also reduce the temperature of 3-5 degrees celsius.

Error analysis of LED heat dissipation

4 superstition heat pipe

There is no doubt that the heat pipe has good thermal conductivity. But the heat from the heat sink eventually needs to pass the air convection to the tropics. If there is no heat dissipation fins, heat pipe will soon reach the heat balance, the temperature with the heat sink rise. And if the heat pipe to increase the heat sink, and ultimately with fin cooling. And the contact point of fin and heat pipe is not as good as other ways. As a result, the cost is high and the cooling effect is not improved. However, the heat pipe to be used in the integration of LED heat conduction is useful, but to a reasonable structure!

5 some manufacturers believe that some of the radiation material

Radiation cooling in the current LED lamp temperature of 50 degrees Celsius in the case of the proportion can be ignored. The manufacturers of radiation coating, even as they have a very good radiation effect, even if the radiation reached the blackbody radiation capacity, but the proportion of its heat dissipation. And the coating itself will hinder the heat export, thus affecting the heat convection.