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LED heat dissipation, error analysis and the method to deal with:The LED heat dissipation of error analysis
2014-03-26 15:05:31

LED heat dissipation, error analysis and the method to deal with:The LED heat dissipation of error analysis

1.The LED heat dissipation of error analysis

The LED heat dissipation myth is mainly manifested in the following aspects:

1. The internal quantum efficiency is not high.When electrons and holes of composite,Doesn't have photon 100%, often referred to as the "leak" current and lower the PN area carrier recombination rate.Is this part of the power leakage current times the voltage,Is converted into heat energy,But it does not occupy a main component part,Because now the internal efficiency of photon is close to 90%.

2. The inside of the photons to all injection to chip external and finally converted into heat.This is the main part,Because the current is called external quantum efficiency is only 30%,Most were converted into heat.

3. The excessive dependence on thermal conductive materials.What because use high-tech materials can scatter heat out.Actually using ordinary aluminum radiator,After many tests,The temperature of the heat sink is only higher than the bottom of the radiator for 3 to 5 degrees Celsius.That is to say,If it can use to a thermal conductivity, good material,Under the condition of the thermal resistance is zero,Also can reduce the temperature for 3 to 5 degrees Celsius.

4. Superstition heat pipe.Heat pipe with good heat conduction ability,This is beyond doubt.But derived from heat sink thermal eventually need to go through the tropical air convection.If there is no cooling fins, heat pipes will soon reach thermal equilibrium, the temperature rise together with the heat sink.And if the increase in heat pipe radiator fins, eventually with fins heat dissipation.And fins and heat pipe contact point but not as good as other ways to contact.As a result of high cost, the cooling effect is not improving.But heat pipe used in integrated LED heat conduction or useful, but the structure is reasonable!

5. Take some manufacturer propaganda nano radiation material.Radiation temperature in the LED lamps and lanterns of 50 degrees Celsius under the condition of share can be ignored.Propaganda and manufacturer of radiation coating even as their propaganda has good radiation effect,Even achieve blackbody radiation radiation ability, its heat dissipation ratio but a few percent.And coating itself will hinder hot export, thus affecting the heat convection.


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