LED cooling solution:
Solve Led's heat, mainly from two aspects, before and after packaging, can be understood as Led chip cooling and Led lamps cooling. Led chip cooling and substrate and circuit selection and process-related, because any LED will be made of lamps, so the heat generated by the LED chip is always the final through the lamp shell to the air. If the heat is not good, because the LED chip heat capacity is very small, a little bit of heat accumulation will make the chip's junction temperature increased rapidly, if the long-term work in the high temperature state, its life will soon shorten. However, these heat to be able to really lead the chip to reach the outside air, to go through many ways. Specifically, the heat generated by the LED chip, from its metal heat block out, first through the solder to the aluminum plate PCB, and then through the thermal plastic to the aluminum radiator. So the cooling of LED lamps actually includes heat and heat two parts.
However, LED lamp shell cooling based on power size and use of places, there will be different options. Mainly have the following cooling methods:
Aluminum Heat Fin: This is the most common way of cooling, with aluminum fins as part of the shell to increase the heat dissipation area.
Thermal plastic shell: plastic shell filled with plastic materials, plastic shell to increase the heat, cooling capacity.
Air Fluid Mechanics: The use of light shell shape, to create convection air, which is the lowest cost to strengthen the cooling method.
Fan: lamp shell with longevity and efficient internal fan to strengthen the heat, low cost, good effect. But to change the fan is trouble, do not apply to the outdoor, this design is relatively rare.
Heat pipe: the use of heat pipe technology, the heat from the LED chip to the shell cooling fins. In large lamps, such as street lamps are common designs.
Surface radiation heat treatment: lamp shell surface to do radiation heat treatment, the simple is to apply Zhisheng Weihua radiation cooling coating, you can use the heat away from the light shell surface.
The following describes a new type of thermal coating: ZS-411 radiation cooling coating, coating coating with high thermal conductivity and large heat dissipation surface area, while in a wide range of wavelength (1-20μm) with high emissivity, can Significantly improve the comprehensive performance including conduction, convection, and radiant heat dissipation.
This coating uses a high performance cooling solution, which has high visible and near infrared light reflectance, high thermal infrared emissivity and stability and other special properties, but also has good physical properties, chemical properties and good Of the construction of a variety of composite, the working principle of the thermal solution is to rely on inorganic colloidal particles (less than 100 nm) condensation occurs and produce binding force. Coating material with carbon nanotubes and other high thermal conductivity and emissivity of the material, can make the surface of the coating surface of the macro-rough micro-rough shape of the nano-material components, can greatly increase the thermal device and the outside contact area, Significantly enhance the cooling effect. At the same time, a large number of spinnerets, which are electronically transposed, are added as complex infrared radiators, which increase the impurity energy level and improve the infrared radiation coefficient, and maintain the corresponding thermal stability and heat resistance.
In general, the luminous efficiency of the LED is still relatively low, causing junction temperature rise, life expectancy. In order to reduce the junction temperature to improve life expectancy must pay great attention to the problem of heat.