High power LED heat dissipation new solutions
As is known to all, is one of the advantages of the LED with high photoelectric conversion efficiency, compared with the traditional light source has a lot to improve, but due to the limitation of current technology development, efficiency or is it just about 15-20%, which means that as many as 80-85% of the electrical energy is transformed into heat. So, the problem of heat dissipation has been the important challenge for the LED lighting.
Retired professor of tsinghua university, the United States MaoYuHai think PAM consultant LED heat dissipation of the major challenges facing or high-power lamps, as well as the stadium and high brightness light heat dissipation of the ground. Because of big power, needs the heat is big, and face all kinds of exposure, hot weather in the open air and increasing the difficulty of heat dissipation. The high brightness spot is one of the difficulties of the theatre. In addition, the high power PAR38 lamp due to small volume, big power, no electromagnetic interference also increased the difficulty of heat dissipation. LED cooling solution types varied, mainly including aluminium radiator fins, thermal conductive plastic shell, fan, heat pipe, surface radiation heat treatment, etc. Among them, the heat sink and high-speed fan is by far the most common way of handling. But as lighting applications to the requirement of increasing the light output, the heat flux LED products increasing, per unit time need cooling heat is becoming more and more big, therefore, Nuventix Jin Hailin, head of Asia Pacific technical support, points out that the biggest challenge is how to reduce the increasing heat flux.
Emerging piezoelectric ceramic fan, fan hakaze fan and other advanced technology with strong cooling capacity, but for the application of LED lighting such a small space, from the size, volume, cost, power consumption structure, the respect such as large-scale production can be considered that do not apply. Jin Hailin analysis, because of the passive radiator is subject to limited heat transfer capacity, unit time will take away heat is limited, that used to cool high power LED module radiator had to do a lot of very heavy. And active cooling (such as SynJet cooling scheme) can overcome these shortcomings, through the forced convection heat transfer of high efficient heat dissipation ability quickly take away heat, reduce the temperature of the LED chip, and reduced the volume and weight of the radiator at the same time, to better meet the requirements of miniaturization of lighting design.
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