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To solve the problem of heat dissipation of high power LED


  LED lighting development today, the brightness is not the problem, but because of the PN junction itself, photoelectric conversion rate is only about 30%, the remaining 70% into heat. And now the lighting equipment with high power is obvious, so now the problem of heat dissipation of LED lighting has become the bottleneck of the development of the industry. In order to break through this bottleneck, engineers have to do a lot of solutions, we on the heat dissipation technology popular on the market now discuss.
  One, section heat radiating the most traditional
  This is a popular method of heat dissipation is now available in the market, the aluminum made sun flower, comb shape modeling. The chip is fixed to the bottom of the radiator, the use of metallic conductivity to heat conduction to the fins, the heat away by convection of air. But if we look up table would be found, the heat dissipation performance of aluminum is good, but the heat conduction performance in general, is some people will encounter such a situation: the temperature difference between the bottom and on the top of the radiator. So why do we need a good thermal conductivity material? Good thermal conductivity than aluminum material has the copper and silver, but the reference price, aluminum is the most appropriate. For small power, aluminum can be cooling, but for large power, radiation efficiency of aluminum is not enough. So there is the following two forms: with fan forced cooling and heat pipe technology
  Two, plus a fan forced cooling
  Due to the integrated chip and computer now is very similar to CPU, therefore, the fan to the radiator will emerge as the times require. After adding fan, cooling effect has been improved, but because the heat conduction rate of aluminum itself is not high, resulting in higher heat dissipation efficiency is not many, also cannot solve the high-power cooling requirements. But fans there is a fatal disadvantage: high power lighting environment generally relatively bad, fan reliability is worrying. Street lamps, mining lamps, dock lamp etc., wind, sun, rain, dust, corrosion resistance, the fan lived? Now the LED lamp is generally known as the 100000 hours, about 11 years. We have seen CPU radiator fan, 2 years later, high-power LED radiator fan really can use? Conclusion we must already know. In addition, LED is energy-saving products, but the heat energy again, this will enable LED to lose the advantages of energy conservation.
  Three, the heat pipe
  The principle of the heat pipe is very simple, is the phase change technology. Cyclic changes in a process called transformation is liquid, gas, liquid. We know, liquid -- taking water as an example, the heat absorption into gas, water vapor heat into liquid water. Heat pipe is the use of the suction to transfer heat. The general heat pipe is made of copper, copper heat conduction rate high, heat dissipation rate is low, the heat conduction, but scattered out. And then there is the thermal column of copper aluminum combined. The heat conduction rate of copper is used to heat; heat dissipation efficiency high, the high aluminum, aluminum radiator. This combination seems a seamless heavenly robe, but lots of defects. The first problem is the combination of the first copper, know a little bit of chemistry knowledge knows, copper and aluminum melting point is not the same, it is impossible to weld together. Only then the adhesive, so it is very easy to create problems, also is the poor reliability. Secondly, the heat pipe heat limit, once boiling in tube, heat pipe is very likely to explode. These shortcomings make the heat pipe is very unreliable.
  Four, other
  Includes a thermally conductive plastic, ceramic heat conduction, radiation treatment, all of these can not solve the problem of heat dissipation of high power LED fundamentally. Until one day appear below this technology:
  Five, micro grooves phase change composite technology
  In 2011 by the research on the thermal China Academy of Sciences and Beijing Institute of San Reed Energy Saving Technology Co Ltd co production of high-power LED radiator formally into city sales. It is a high strength composite phase change by using the micro scale grooves structure of heat sink for cooling heat transfer enhancement mechanism. Not only retains the other radiating technology advantage, and no other radiating technical shortcomings. The cooling capacity of heat flux density super: up to 400W/ square meters, about 100 times the specific heat pipe; light weight, small volume: weight not to the existing radiator 25%, or so small volume 20%; no power cooling fan or pump: no need, no cooling energy consumption; high reliability: no external links, improve the whole reliability.
  Six, here have to mention cold forging radiator, is currently the LED lamp adopts the best radiator, which adopts pure aluminum forging, directly change the casting radiator, radiator heat dissipation effect, several improvement of radiating power than before, not only in appearance so cold forging processing more diverse.
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