LED cooling solution:
Led to solve the heat, mainly from two aspects, before and after the package, can be understood as Led chip cooling and LED cooling. Led chip cooling and the substrate and the circuit is mainly related to the choice and technology, because any LED will be made of lamps and lanterns, so the heat generated by the LED chip is always scattered through the shell of the lamp to the air. If the heat is not good, because the LED chip heat capacity is small, a little bit of heat accumulation will make the chip junction temperature rapidly increased, if long-term work in high temperature, its life will soon shorten. However, the heat to be able to really guide the chip to the outside air, go through many ways. Specifically, the heat generated by the LED chips, coming out of its metal heatsinks, passes through the solder to the PCB of the aluminum substrate and then to the aluminum heatsinks through the thermal paste. Therefore, the actual cooling of LED lamps and lanterns, including heat and heat in two parts.
However, LED lamp housing heat dissipation based on the size and use of places, there will be different options. There are several main cooling methods:
Aluminum cooling fins: This is the most common cooling method, with aluminum cooling fins as part of the shell to increase the cooling area.
Thermal plastic shell: plastic shell filled with thermal conductivity material, plastic shell to increase thermal conductivity, thermal capacity.
Air Hydromechanics: The use of lamp shell shape to create convection air, which is the lowest cost of enhanced cooling.
Fan: Longevity and efficient fan inside the lamp shell to enhance heat dissipation, low cost, good effect. However, to change the fan is more troublesome, nor suitable for outdoor, this design is relatively rare.
Heat pipe: The use of heat pipe technology, the heat led by the LED chip fins to the shell. In the large lamps, such as street lights is a common design.
Surface Radiation Heat Treatment: The surface of the lamp shell radiating heat treatment, simply apply Zhi Sheng Weihua radiation cooling coating, the heat can be taken away from the lamp shell surface radiation.
The following describes a new type of thermal coating: ZS-411 radiation cooling coating, coating coating with high thermal conductivity and large cooling surface area, while a wide wavelength range (1-20μm) with high emissivity, you can Significantly improve the overall performance including conduction, convection, radiant heat dissipation.
The coating uses a high-performance thermal solution, the thermal solution has high visible and near-infrared light reflectivity, high thermal infrared emissivity and stability and other special properties, but also has good physical properties, chemical properties and good The construction of a variety of complex, the cooling solution works by colloidal inorganic colloidal particles (less than 100 nm) to produce cohesion. The addition of carbon nanotubes and other materials with high thermal conductivity and emissivity in the coating solution can make the surface of the coating appear macroscopic, macroscopically and coarsely roughened, and can greatly increase the contact area between the heat sink and the outside world, Significantly enhance the cooling effect. At the same time adding a large number of electronic transition over a variety of spinel as a composite infrared radiator, both increasing the impurity level, improve the infrared radiation coefficient, while maintaining the corresponding thermal stability, heat resistance.
Overall LED luminous efficiency is still relatively low, resulting in increased junction temperature, lower life expectancy. In order to reduce the junction temperature to improve life expectancy, we must attach great importance to the issue of heat dissipation.
