Figure 1 shows the structure used in the current high-power LED package . The LED chip is first packaged on the heat-conducting substrate, and then the gold wire and the sealant are used. The LED package structure has the advantages of light weight, high thermal conductivity and simple circuit, and can be applied outdoors. And indoor lighting . Among the choice of substrate, alumina (Al2O3) and silicon (Si) are materials that have been applied in the market at present. Among them, the alumina substrate is an insulator, and must have a conductive heat design, and the copper layer is thickened by electroplating to 75um; Silicon is an excellent thermal conductor, but it has poor insulation and must be insulated on the surface.
Figure 1 LED package structure
Alumina substrates and silicon substrates have been used in high-power LED packaging. Since LED luminous efficiency still needs to be improved, heat is still an important problem that must be solved when using LED lamps. Therefore, LED thermal conduction functions must be carefully analyzed. To analyze the thermal conductivity function, the thermal resistance meter must be used for measurement. The following analysis will subdivide the LED package structure, including the chip layer, the bonding layer and the substrate layer, to analyze the thermal resistance of each layer. The analysis tool is the most recognized in the world. T3Ster instrument.
This article will briefly analyze the performance of the thermal resistance of the alumina substrate and the silicon-based LED board package (T3Ster instrument measured), the proper nouns are defined as follows:
Rth: thermal resistance, the unit is (°C/W), and the formula is T/KA;
T: thickness of the thermally conductive substrate (um);
K: thermal conductivity of the thermally conductive substrate (W/mC);
A: Heat transfer area (mmxmm).
The LED projector lamp is used to specify the luminance above the surrounding environment, and also called the spotlight.Usually, it can be aimed at any direction and has a structure that is not affected by climatic conditions.It is mainly used for large area operation field, building outline, stadium, overpass, monument, park and flower bed.As a result, almost all outdoor use of large areas of lighting can be seen as a projector lamp.
Description of products
1. Fashionable, modern appearance design, make lamps and lanterns also become a work of art, with the environment perfect union.
2. The main material of the luminaire is made of high strength die-casting aluminum material, and the surface anti-aging electrostatic spraying process, Self-cleaning and anti-corrosive.
3. Tempered glass cover with high strength and impact resistance.
4. The lamp can be configured white or monochromatic RGB, gorgeous lighting effects, color purity, powerful change.
5. The lamp body is made of high - die cast aluminum material, surface electrostatic spraying
6. The unique rotatable fixed bolt can be rotated 360 degrees.
7. The light source adopts 1W single RGB light source, LED combination optical arrangement, and the mixing effect is better.
8. The light can be controlled by DMX512, a powerful function of changes in lighting effects.
9.Lamp series, power can be between 18W-36W, can be used for a variety of applications.
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Jiangsu chengxu Electric Group Co., Ltd , http://www.chengxulighting.com