At present, one of the biggest technical problems of LED lighting is heat dissipation. Poor heat dissipation leads to LED driving power supply and electrolytic capacitor becoming the shortcoming of further development of LED lighting and the cause of premature aging of LED light source.
Only when the heat is exported as soon as possible, can the cavity temperature inside the LED lamp be effectively reduced, can the power supply be protected from working in a high-temperature environment, and can the premature aging of the LED light source be avoided due to long-term high-temperature work.
It is because the LED light source has no infrared ray and ultraviolet ray, so the LED light source has no radiation and heat dissipation function. The heat dissipation way of LED lighting can only be derived through the heat sink closely combined with the LED bead plate.heat sink must have the function of heat conduction, heat convection and heat radiation.
Any heat sink, besides want to be able to be conducted quickly heat quantity from calorific source the surface of heat sink, the main still should rely on convection and radiation to send out heat quantity to go in air.Heat conduction only solves the way of heat transfer, and heat convection is the main function of heat sink, heat dissipation performance is mainly determined by the ability of heat dissipation area, shape, natural convection intensity, and heat radiation is only an auxiliary role.Generally speaking, if the distance of heat from the heat source to the heat sink surface is less than 5mm, the heat can be derived as long as the thermal conductivity of the material is greater than 5, and the rest of the heat dissipation must be dominated by thermal convection.
The following is a comparative analysis of four types of heat sinks.
1. Die-cast aluminum heat sink
The production cost is controllable, and the cooling fin cannot be made thin, so it is difficult to maximize the cooling area.The common die casting materials for the heat sink of LED lamps are ADC10 and ADC12.
2. Extruded aluminum heat sink
Is the liquid aluminum through the fixed mold extrusion molding, and then the bar through machining cutting into the shape of the heat sink, the late processing cost is high.Heat dissipation of the teeth can do a lot of very thin, heat dissipation area to get the largest expansion, heat dissipation of the teeth automatically formed when the air convection heat diffusion, heat dissipation effect is better.The commonly used materials are AL6061 and AL6063.
3. Stamping aluminum heat sink
Is through the punch and die of steel, aluminum alloy plate stamping, pull up, so that it becomes a cup type heat sink, stamping shaped heat sink inside and outside the periphery of smooth, because of finsless and heat dissipation area is limited.The commonly used aluminum alloy materials are 5052, 6061 and 6063.The quality of stamping parts is very small and the material utilization rate is high.
4. Skived fins aluminum heat sink
The heat dissipation plate is a whole section without any connecting points, which can give full play to the heat dissipation characteristics of the section.
Lori technology professional do Skived fins heat sink, Skived fins process can make the blade blade thinner/higher density, high heat dissipation efficiency.The processing technology is simpler than other water-cooled liquid-cooled heat sinks, the weight is lighter and the cost is lower.
Compared with the aluminum extrusion process, there are no size restrictions, can be made more wide, free from the expensive mold cost, can be used for heat dissipation on high-power equipment.
LED are solid - state semiconductor devices that convert electrical energy into visible light.The heart of an LED is a semiconductor chip, which is known to generate a lot of heat when working.The greater the power of the lamp, the greater the heat.For example, CPU and GPU are the same, so heat dissipation protection is particularly important.In the case of poor heat dissipation, the life of LED will be greatly reduced, Lori technology professional customization of high-power heat dissipation, to provide the best thermal solution.
For large outdoor LED lights, heat dissipation is particularly important.Passive heat dissipation or air cooling heat dissipation has been increasingly unable to meet the heat dissipation needs.This requires the introduction of new cooling technology, and water cooling cooling is a good choice.No matter from heat dissipation technology, or from more aspects, water cooling heat dissipation will be a mainstream trend in the future.The advantage of water cooling is that the heat dissipation efficiency can quickly remove the heat and effectively reduce the core temperature.The relatively closed space allows the LED to be free from dust.Extend the service life of lamps and lanterns thereby, also increased the brightness of illume.Excellent stability, reduced maintenance costs.In a word, water cooling heat dissipation is a good solution to the problem of LED heat dissipation.For scenes with more outdoor applications, football fields, basketball courts and stadiums play an important role.