New solution for high-power LED heat dissipation

　　 As we all know, one of the advantages of LED is that it has a high photoelectric conversion efficiency, which is greatly improved compared with traditional light sources. However, due to the limitations of current technology development, the efficiency is probably only 15-20%, which means As much as 80-85% of the electrical energy is still converted into heat. Therefore, heat dissipation has always been an important challenge facing LED lighting.

Chang Hui Lighting, a manufacturer of solar LED street lights, believes that the main challenge for LED heat dissipation is the heat dissipation of high-power street lights and high-brightness lights in stadiums and stadiums. Because of the high power, the heat needed to dissipate is also large, and it is more difficult to dissipate heat in the open air facing various hot weather. The high-brightness spotlight of the theater is also one of the difficulties.

There are many types of LED heat dissipation solutions, mainly including aluminum heat sinks, thermally conductive plastic shells, fans, heat pipes, and surface radiation heat dissipation treatments. Among them, heat sinks and high-speed fans are currently the most common processing methods. However, as the requirements of lighting applications for light output continue to increase, the heat flux density of LED products continues to increase, and the amount of heat that needs to be cooled per unit time is also increasing. The biggest challenge at present is how to reduce the increasing heat flux density.

Emerging advanced technologies such as piezoelectric ceramic fans and fanless fans have strong heat dissipation capabilities. However, for applications in small spaces such as LED lighting, from the size, power consumption, cost, structure, and scalability Comprehensive consideration of productivity and other aspects is not applicable. To

Because passive radiators are subject to limited heat exchange capacity, the amount of heat that can be removed per unit time is very limited, so the radiators used to cool high-power LED modules have to be made very large and heavy. Active heat dissipation (such as the SynJet cooling solution) can overcome these shortcomings. The high efficiency heat dissipation capability of forced convection heat transfer can quickly remove heat, reduce the temperature of the LED chip, and at the same time reduce the size and weight of the heat sink, so as to better meet the requirements. The requirements for miniaturization of lighting design.