亚洲 欧美 图片 自拍 视频

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          LED small class: how to solve the heat problem of high-power LED lighting

          The two most expensive and highest-power LED lighting applications are the backlighting and headlights of large-screen LCDTV displays. Take a look at the standard LED car headlights used by Lexus, Audi, and even GM's Cadillac Escalade. The overall lighting structure of all these cars is very similar. Each automotive headlamp includes five LED-powered beams optimized for a variety of lighting requirements, including: low beam, high beam, turn assist lights, daytime running lights, and turn signal indicators.

          Standard LED illumination beams typically will require 35W to 50W of power. This may not seem like a lot of power; however, LEDs provide 10 times the brightness of HID halogen lamps, so the LED's light output is equivalent to a 500W halogen lamp. The power required for a high beam is generally the same or slightly higher than a standard illumination beam, while the power required for a turn assist light, a daytime running light, and a turn signal indicator is lower. However, the overall automotive headlamps consume more than 200W of electrical energy, which may cause significant thermal power dissipation problems. This is really not a good thing, because as the operating temperature increases, the light output and working life of the LED will decrease rapidly.

          There are many ways to deal with this heat dissipation problem. One is to add a large number of heat sinks to remove heat from the lights. However, this creates another set of problems, including an increase in cost and weight due to the use of heat dissipating materials. The most effective way to solve this problem is to use a very efficient driver (>93% efficiency) to minimize the heat dissipation of the LED driver circuit. This is not as difficult as it sounds, because a 50W high beam can usually consist of 14 1ALEDs in series. Since the forward voltage drop over the entire temperature range is approximately 4V per LED, the boost converter LED driver topology can boost the nominal battery voltage of 12V to just over 56V with 93% efficiency. This makes it only need to dissipate With a power of 3.5 W, for this power dissipation value, a low-grade copper heat sink can be easily placed in a printed circuit board on which an LED headlight is mounted.

          Offshore communication cable

          Name:0.6/1kV low smoke halogen free offshore communication cable

          Model:S1 RFOU(I), S2 RFOU(C), S3 BFOU(I), S4 BFOU(C)

          S1/S5 RFOU(I), S2/S6 RFOU(C), S3/S7 BFOU(I), S4/S8 BFOU(C)

          Specification:(1~37 Pairs)?—(0.75~2.5)mm2,  (1~37 Triples)?—(0.75~2.5)mm2

          Executive Standards:IEC60092-350, NEK606

          Application:The cable is mainly intended for instrumentation, communication, control, and alarm system of offshore units, The codes S1/S5, S2/S6, S3/S7, S4/S8 meets the mud resistant requirements in NEK606.

          Flame Retardant Marine Communication Cable

          4 Core Cable,Flame Retardant Marine Communication Cable,Offshore Communication Cable Flame Retardant,Halogen Free Flame Retardant Shipboard Cable

          Jiangsu Jiangyang Special Cable Co,.Ltd. , https://www.jymarinecable.com

          亚洲 欧美 图片 自拍 视频
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