LED lighting fixtures one of the biggest technical problems is the cooling problem, poor heat dissipation led to LED drive power, electrolytic capacitors have become the further development of LED lighting fixtures, LED light source premature aging reasons.
Any radiator, in addition to the heat can be quickly transferred from the heat source to the surface of the radiator, the most important thing is to rely on convection and radiation to heat the heat to the air. Thermal conductivity only solves the heat transfer path, and thermal convection is the main function of the radiator, heat dissipation performance is mainly determined by the ability of heat dissipation area, shape, natural convection strength, heat radiation is only auxiliary role. In general, if the heat from the heat source to the radiator surface distance is less than 5mm, then as long as the material thermal conductivity is greater than 5, the heat can be derived, the rest of the heat must be dominated by thermal convection.
The following is a comparative analysis of Category 4 heatsink:
1.Die-cast aluminum heatsink
Production costs can be controlled, the cooling wings can not be thin, it is difficult to maximize the cooling area. LED lamp radiator commonly used die-casting materials for the ADC10 and ADC12.
2.Extruded aluminum heatsink
The liquid aluminum through a fixed mold extrusion molding, and then the bar by machining the need to cut into the shape of the radiator, the latter part of the higher processing costs. The cooling wings can be done a lot of thin, the area of heat to get the greatest expansion, the cooling wing work automatically form air convection to diffuse heat, cooling effect is better. Common materials are AL6061 and AL6063.
3.Stamping aluminum heatsink
Through the punch and die on the steel, aluminum alloy sheet stamping, pulled up, making it into a cup of the radiator, stamping the radiator inside and outside the smooth, due to wingless and cooling area is limited. Commonly used aluminum alloy material is 5052,6061,6063. Stamping parts of the quality is very small, high utilization of materials, is a low-cost program.
Aluminum heatsink thermal conductivity is ideal, more suitable for isolated switching constant current power supply. For non-isolated switch constant current power supply, the need for the design of the lamp through the AC and DC, high voltage and low voltage power supply isolation, in order to pass CE or UL certification.
4. Plastic aluminum heatsink
A heat-conductive plastic shell aluminum core radiator. Thermal plastic and aluminum heat sink in the injection molding machine on a molding, aluminum thermal core to do the pieces, the need for pre-mechanical processing. The heat of the LED lamp beads is quickly conducted through the aluminum heat sink to the thermally conductive plastic, which uses its multi-wing to form air convection heat, using its surface to radiate some heat.
Plastic aluminum radiator general use of thermal plastic original color white and black, black plastic plastic aluminum radiator radiation cooling effect better. Thermal conductivity of a thermoplastic material, material flow, density, toughness, strength are easy to injection molding, has a good resistance to cold and heat impact cycle characteristics, excellent insulation properties. Thermal conductivity of plastic radiation is better than ordinary metal materials. Thermal plastic density than casting aluminum and ceramic 40% smaller, the same shape of the radiator, plastic aluminum can reduce the weight of nearly one-third; compared with the aluminum radiator low processing costs, short processing cycle, low processing temperature; Finished products are not fragile; customer-owned injection molding machine can be differentiated lighting design and production. Plastic aluminum radiator insulation performance is good, easy to pass safety regulations.
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