LED lighting lamp 5 types of radiators contrast analysis
The LED lighting lamps and lanterns is one of the major technical problems in the heat dissipation problem, poor heat dissipation lead to LED drive power supply, electrolytic capacitor is short to the further development of LED lighting lamps and lanterns, the LED light source, the causes of premature aging.
Only by reducing export quantity of heat to be effective as soon as possible the cavity temperature inside the LED lamps and lanterns, can protect the power supply does not work in the persistent high temperatures, can avoid the LED light source for high temperature for a long time work and produce premature aging.
Because of the LED light source itself no infrared, ultraviolet, so the LED light source itself without radiation cooling function, the LED lighting lamps and lanterns of the cooling way only through close combination with LED lamp bead board heat radiator to export.
The radiator must have the function of heat conduction, heat convection and heat radiation.
Any radiators, in addition to being able to quickly heat the heat from the heat source to the surface of the radiator, the main thing is to radiate the heat into the air by convection and radiation.
Way only solves the heat transfer of thermal conductivity, and heat convection is the main function of the radiator, the heat dissipating performance mainly by natural convection heat dissipation area, shape, strength the ability of the decision, the effect of thermal radiation is auxiliary.
In general, if the heat from the heat source to the radiator surface distance is less than 5 mm, so as long as the material coefficient of thermal conductivity is greater than 5, the heat can be derived, and the remaining heat must be dominated by heat convection.
Most LED lighting sources still use low voltage (VF = 3).
2V), large current (IF = 200-700ma) LED lamp bead, because of high heat in the work, must use the aluminum alloy with high thermal conductivity.
Usually have die-casting aluminum radiator, extruded aluminum radiator, pressed aluminum radiator.
Die-casting aluminum radiator technology is a kind of pressure casting parts, poured liquid zinc copper aluminum injection into the mouth of die casting machine, the die casting machine die casting, casting out the shape of the mould qualified radiator designed.
The following is a comparative analysis of five types of radiators.
Cast aluminum radiator
The production cost is controllable, the cooling wing can not be thin, and it is difficult to maximize the heat dissipation area.
The used die casting materials for LED lamps are ADC10 and ADC12.
Extruded aluminium radiator
The liquid aluminum is extruded by a fixed mold, then the bar can be machined and cut into the desired shape radiators, and the later processing cost is higher.
The extruded aluminum radiator is shown in figure 3.
The cooling wing can do a lot of thin, the heat dissipation area gets the biggest expansion, the cooling wing automatically forms the air convection diffused heat, the cooling effect is better.
The commonly used materials are AL6061 and AL6063.
Pressed aluminium radiator
Is through the punch and die for steel, aluminum alloy sheet metal stamping, pull to rise, make a cup of tube type of radiator, stamping molding radiator inside and outside perimeter smooth, because there was no wings and the cooling area is limited.
The commonly used aluminum alloy materials are 5052, 6061, 6063.
The quality of stamping parts is very small, the material utilization is high, is a kind of low cost plan.
The thermal conductivity of aluminum alloy radiator is ideal, which is suitable for the isolated switch constant current power supply.
For the non-isolation switch constant current power supply, the separation of ac and dc, high voltage and low voltage power supply needs to be done through the structural design of the lamp, so as to be certified by CE or UL.
Plastic coated aluminum radiator
It is a radiator with aluminum core for thermal conductivity.
The thermal conductive plastic and aluminum cooling core are formed in the last time of the injection molding machine. The aluminum radiator core is made of embedded parts, which need to be machined in advance.
The heat of the LED bulb is transmitted through the aluminum radiator to the conductive plastic rapidly. The thermal conductive plastic USES its multiple wings to form convective heat dissipation, and USES its surface to radiate some heat.
The plastic bag aluminum radiator generally USES the color white and black of heat conduction plastic, the radiating effect of the plastic aluminum radiator of black plastic is better.
A thermoplastic material of thermal conductivity, the fluidity, density, toughness and strength of the material are easy to be formed by injection molding. It has excellent cold and heat impact cycle characteristics and excellent insulation performance.
The thermal conductivity of thermal conductivity is superior to that of ordinary metal materials.
The density of thermal conductivity is 40% less than that of die-cast aluminum and ceramic, and the same shape of radiators can reduce the weight of aluminum alloy by nearly a third.
Compared with the whole aluminum radiator, the processing cost is low, the processing cycle is short, the processing temperature is low;
The finished product is not easily broken;
The customer self-provided injection molding machine can carry on the lamp differentiation design production.
Plastic wrap aluminum radiator insulation good, easy to pass the safety.
High thermal conductivity plastic radiator
High thermal conductive plastic radiator recently development soon, a kind of whole plastic radiator radiator for thermal conducting plastics and its coefficient of thermal conductivity is higher than common plastic dozens of times, up to 2-9 w/mk, excellent heat conduction and thermal radiation ability;
It can be used in various kinds of LED lamps for 1W ~ 200W.
High thermal conductivity plastic resistance grade can reach ac 6000V. It is suitable for high voltage linear constant current power supply with non-isolation switch constant current power and HVLED.
This kind of LED lighting lamp is easy to be tested by strict safety regulations such as CE, TUV and UL.
HVLED adopts high voltage (VF = 35-280vdc), small current (IF = 20-60ma) working state, and the heating of HVLED bead plate decreases.
High thermal conductive plastic radiator adopts traditional injection molding and extruding machine.
Once formed, the finished product has high finish.
Greatly improve the efficiency, the design flexibility is high, can give full play to the designer's design concept.
High thermal conductive plastic radiator with PLA (corn starch) polymerization and degradation, no residue, no chemical pollution, the production process without any heavy metal pollution, no water, no exhaust gas, conform to the requirements of the global environmental protection.
The internal PLA molecules of high thermal conductivity plastic radiator are interlining nano-grade metal ions, which can move rapidly at high temperature and increase the energy of thermal radiation.
Its vitality is better than that of metal materials.
High thermal conductive plastic radiator resistance to high temperature, 150 ℃ for five hours no rupture, deformation, with high voltage linear constant current IC driver program application, without electrolytic capacitor and inductance, large volume significantly improves the life span of LED the whole light, not isolation power supply scheme, high efficiency and low cost.
It is especially suitable for the application of daylight lamp tube and high power mining lamp.
High thermal conductive plastic radiator can design a lot of precision of the heat dissipation wing, the heat dissipation wing can do a lot of very thin, get the maximum extension cooling area, heat dissipation wing work automatically when the air convection diffusion heat, cooling effect is better.
The heat of the LED light bulb goes directly to the cooling wing through high thermal conductivity plastic, and rapidly dissipates heat through air convection and surface radiation.
High thermal conductivity plastic radiators are less dense than aluminum.
The density of aluminum is 2700kg/m3, while the density of the plastic is 1420kg/m3, which is about half of the aluminum, so the same shape of radiator, the plastic radiator is only 1/2 the weight of aluminum.
Moreover, the process of processing is simple, and its forming cycle can be shortened by 20-50%, which also reduces the driving force of cost.
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