LED heat dissipation five error analysis and solution of seven

With the widely application of the LED, LED heat dissipation problem is becoming more and more attention, the LED heat dissipation performance is good or bad will directly affect the service life of LED products.

LED heat dissipation error analysis

LED heat dissipation myth is mainly manifested in the following aspects

the internal quantum efficiency is not high,

in the composite, the electrons and holes is not 100% produces photons, which is commonly referred to as the 'leaks' and reduce PN area carrier recombination rate. Leakage current is multiplied by the voltage, the power of this part 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 internal produce all photons cannot penetrate into the chip external and finally converted to heat the

this part is mainly, because the current is called external quantum efficiency is only 30%, mostly is converted into heat.

because of three over-reliance on thermal conductive materials using high-tech materials can scatter heat out. Actually using ordinary aluminum radiator, after multiple tests, the temperature of the heat sink is only 3 - higher than at the bottom of the radiator 5 degrees Celsius. That is to say, if I can use to a thermal conductivity, good material, under the condition of the thermal resistance is zero, also can reduce the temperature of 3 - 5 degrees Celsius. Four 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!

five trust few manufacturer publicized nano radiation

temperature radiation heat dissipation in the current 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 ability of radiation, the heat dissipation ratio but a few percent. And coating itself will hinder hot export, thus affecting the heat convection.

LED heat dissipation problem to

let's take a look at plan about LED heat dissipation problem.

scheme a aluminum radiator fins

this is the most common way of heat dissipation, use aluminum radiator fins as a part of the shell to increase the cooling area.

2

the use of thermal conductive plastics shell LED heat insulation plastic instead of aluminum alloy heat dissipation body, can significantly improve the ability of thermal radiation.

project three air fluid mechanics

use lamp shell shape, create convection air, this is the lowest cost to strengthen the cooling way.

plan 4 ball bubble

use liquid ball bubble liquid packaging technology, the thermal conductivity of high transparent liquid filled in the ball bubble lamp body. This is in addition to the reflective principle, only use smooth thermal conductivity, heat dissipation of the LED chip technology.

scheme 5 lamp holder using the

in the home of small power LED lights, often using the internal space of the lamp holder, the driver circuit part or all of the heat into. So that you can use like screw base has a large lamp holder of the metal surface heat dissipation, because lamp holder is contact base metal electrode and the power cord. So part of the heat can be derived.

solution

six heat insulation plastic instead of aluminum alloy heat insulation plastic instead of aluminum alloy heat dissipation, the LED heat insulation plastic, while maintaining the heat dissipation capacity and aluminum alloy flat, to improve thermal radiation ability by 4 - Eight times. Made of the heat dissipation material LED heat dissipation energy boost overall heat dissipation effect.

- seven thermal cooling solution integration - The use of high thermal conductive ceramic

lamp shell cooling purpose is to reduce the working temperature of the LED chip, due to the LED chip expansion coefficient with the metal thermal conductivity, heat dissipation material expansion coefficient difference is very big, can't be directly LED chip welding, to avoid high and low temperature thermal stress damage LED chip. The latest high thermal conductive ceramic material, the thermal conductivity is close to aluminum, expansion system can be coordinated to be synchronous with the LED chip. So it can be heat conduction, heat integration, reduce the thermal conductivity of the intermediate links.

put

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