LED is a kind of green illumination source, and its main advantage is high luminous efficiency. With the advancement of materials science, the luminous efficiency will be greatly improved in the next ten years; and the energy consumption is low, the life is long, the materials can be recycled, and the environment will not be polluted.
Based on the above advantages of LED lighting, Europe, the United States, Japan and South Korea have formulated corresponding laws and regulations and industrial support policies, and will promote relevant technologies to the civil lighting field in the next decade or so. Although China started relatively late, in recent years, it has also begun active research and development and industrial policy formulation and support.
Application technology of high-power white LED street light illuminating board design
At present, there are three main types of white LED technology : a small amount of yttrium aluminum garnet phosphor is used on the InGaN blue LED die, and the blue LED emits yellow light, which is mixed with blue light to emit white light; using the three primary color principle The red, green and blue LEDs are mixed into white light; the ultraviolet light LED is used to excite the three primary color phosphors to produce multicolor light to be mixed into white light.
The second scheme is difficult to control, and the array application is difficult to ensure uniform white light. The white light emitted by the third white light technology has ultraviolet light components. Therefore, the first white light technology is selected here for application technology analysis. The successful invention of high-power white LEDs provides material and technical support for the entry of semiconductor light-emitting components into the field of illumination. The use of high-power white light-emitting diodes in the field of illumination requires attention to two issues: electrical/optical conversion and thermal control of the illuminating components.
High-power LEDs are small devices. As manufacturing technology increases, the input drive current increases and the input power increases. Although the electric/optical conversion rate is high, it should be regarded as a point source in terms of chip area, so the amount of heat per unit area is large. The performance of high-power LED devices will be greatly affected by the increase of junction temperature. After a certain temperature, the conversion rate of electricity/light will drop sharply, and even the device will lose its function permanently due to excessive temperature.
2.1 Chip-level application technology for improving the electric/optical conversion rate of high-power LED chips and homogenizing the heat flux density of the chip
With the development of technology, the two-dimensional size of the LED chip is continuously increasing. By expanding the area of ​​the LED chip, the output power of the LED is improved, and the brightness of the light is greatly improved. However, if the chip area is increased, there will be an unfavorable phenomenon such as an increase in the light absorption ratio inside the LED and a decrease in the external quantum efficiency, and the temperature rise of the junction temperature will further increase. Moreover, as the two-dimensional size of the chip increases, the luminous efficiency of the chip itself also decreases rapidly.
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Description for Food Processor 7 In 1
8820 copper & aluminum Motor
220V, 50HZ, 450-600W, 18000r
VDE 2 PIN plug 3 speeds
ABS Juicer house 1.8L AS jar
Stainless steel processing blades
Carton Box: 72.5*66*44.5cm 4pcs/ctn
20'GP: 540pcs 40'HQ: 1376pcs
Food Processor 7 In 1
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