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Brief high-power LED lights |
| Author：admin On time：2010-3-8 17:09:33 Read： Times |
Brief high-power LED lights in the number of blog
LED is an electroluminescent light source, the light-emitting principle is added at both ends of the PN junction forward voltage, then the holes will flow into the P area N area. The N area of electronic will flow into the P zone. As the minority carrier and majority carrier compound release of energy, a part of the energy converted into heat, the other part of the energy into light.
Determined by the color of the light-emitting LED matrix and infiltration miscellaneous materials, in addition to white things are basically a more pure monochromatic light, the light color easily controlled, it can be widely applied to various traffic signal lamps, hand-Chi No. lamps, display screens. Number of traditional hand-held railway blog the ordinary incandescent light bulb incandescent light bulbs as a light source or inflated, through red, green, yellow polycarbonate filter to produce a red signal, green signal, yellow signal, on the one hand in the polycarbonate processing of the molding process is difficult to precisely control the amount of added dye, resulting in the color is not pure, on the other polycarbonate long-term use, especially in the sunlight will degrade under the yellow, affecting the color shown. And the service life of incandescent light bulbs are only a dozen hours, replace frequently, continuous working time does not meet the requirements of more than 10 hours, lighting is also heavier, carrying the inconvenience.
Now there are many manufacturers to use the red, green, yellow LED as a signal light source, there are also some vendors with multiple ultra-bright white LED as a white light source, but the white light effect due to the low-power small, inadequate illumination, it can only be used as a signal can not play a role in the work of lighting.
As the LED light effect similar to with incandescent lamps, and increased color range, it has a light source to become the basis of Chi Road, and its response time is short, low heat, low energy consumption and long life, maintenance costs lower edge, immediately causes LED lights in the number of blog has a large number of applications. With the continuous improvement of optical design, coupled with LED light continuously improve efficiency, trackside lights need to use the LED tubes from a starting number of four, down to the present 500 to 100 stars, or even dozens of stars.
High-power LED than the general LED lighting in the application of Chi No. advantages:
1. The use of different materials: epoxy resin generally used as a mounting plate, while the need to use high-power LED aluminum circuit board (MCPCB).
2. Production process different: the general LED using wave soldering machine or by hand may be, but need to use high-power LED Chip welder.
3. Supporting electronic components different: because the welding process is different, so the general LED supporting electronic components is also need to use wave soldering machine or hand the general components, but not with high-power LED package of electronic components need to use SMD components.
4. Automated to varying degrees: Due to the different production processes, SMD (Chip) produced a high degree of automation, you can use water-based product line, and the general LED and general components due to the appearance, structure differences far, there are a considerable part of the work, such as intubation and so need to be completed by hand, so leading to the two man-hours required for processing is also different.
5. Processability to protect different: due to electrostatic protective measures such as LED life is an important factor affecting the general LED degree of automation of production is not high, so electrostatic protective measures such as more difficult to implement, so high-power LED production processes easier to ensure that LED for good performance.
6. Integrating different levels: As the high-power LED adoption of SMD process, so the electronic components can be highly integrated and can be light board and power supply are all doing very little, and the general LED and its supporting components difficult to achieve.
7. Structural design requirements are different: Due to the general LED power is small, a single LED heat low (Of course, these LED's ability to withstand heat is low, cooling effects are bad), but their distribution across the light-emitting plane, so its cooling improvements measures difficult to implement, while the relative concentration of high-power LED, but also the use of placement process installed in the aluminum plate, so you can easily design a number of radiators to be installed directly on the lamp above the board to improve its cooling effect.
8. With optical design requirements are different: general LED since the use of the tube a few more evenly distributed throughout the light-emitting region, so with light needed to do for the corresponding LED, while the number of high-power LED tubes use less, the general Zhi No. 300mm Light the use of 12 or even eight able to meet the requirement, so the entire light emitting surface plate placed near the axis, in the distribution as an approximate concentration of light when light source design.
9. The use of different results: General LED light out because of the angle of incidence on the issue, but scattered throughout the light-emitting surface, within the framework of the spacing between large and therefore in the light-emitting surface of the projection effect is relatively obvious points can be shaped distribution of light source, and because the LED light source intensity distribution itself, there is strong or weak, coupled with ever-present light spot uneven package, the entire light-emitting surface, there is bound to be divided into light and shade, plus grading used is one to one way, so there is an LED or a string of failed cases, there will be classes dark spots, which affect the entire number of light efficiency Chi lights and graphics. The high-power LED as relatively concentrated, dispensed as a light when an approximate concentration of light source, so can avoid the above-mentioned shortcomings.
10. Lifetime different: due to fewer high-power LED with a pipe, a small slip, so easy to use slip constant current power supply, ensure that all the LED has the same power supply environment, even if one individual fails, it will not affect the Other LED supply current. Cooling effect is good, the node will lower the temperature relative, so life expectancy will be extended. Operating current allows large LED-10 times the general, so a few mA current control fluctuations on the high-power LED will not affect the comparison with ordinary LED, it may be a fatal blow, so the exact power supply less dependent control, but also help improve the life expectancy, so you can extend the service life.
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