Abstract: This paper analyzes the potential advantages of the new heat dissipation mode for small and medium power LEDs - vertical heat dissipation. Compared with the traditional heat dissipation mode-horizontal heat dissipation, the new vertical heat-dissipating LED has the advantages of high brightness, fast heat dissipation, low light attenuation and high stability. In this paper, the structure, heat dissipation mode, light decay and color coordinate drift of different heat dissipation mode LEDs are analyzed and compared, and thermal characteristics simulation and experimental test analysis are carried out. From the aspects of heat dissipation, reliability, cost and volume, the photoelectric thermal characteristics of LED based on vertical heat dissipation structure are studied. It is pointed out that the low power LED in vertical heat dissipation structure is the development trend of current application of illumination source.
Key words: LED; thermal management; ANASYS; photoelectric thermal characteristics; light decay
Compared with traditional light sources, LED solid light source has the advantages of high efficiency, pure light color, low energy consumption, long life, reliable and durable, flexible application, no pollution, etc. It has been widely used in road lighting, home lighting, car lighting. , landscape lighting and other fields [1]. However, good heat dissipation characteristics are the fundamental guarantee for the excellent performance and stability of LED. Temperature has an important impact on LED performance, including color temperature changes, wavelength red shift, efficiency degradation, forward voltage drop, etc. Therefore, thermal management has an important impact on LED performance, light conversion efficiency and application [2].
This paper mainly studies the potential advantages of the new vertical heat dissipation mode LED in terms of photoelectric thermal characteristics. Compared with the traditional horizontal heat-dissipation mode LED, the vertical heat-dissipation structure LED has the characteristics of high brightness, fast heat dissipation, low light decay, low cost, stability and reliability, and is currently the development trend of application of illumination light source in small and medium power LEDs.
First, the vertical and horizontal cooling mode structure comparison
In the analysis of LED characteristics of two different heat dissipation modes in this paper, the new vertical heat dissipation mode LED uses the popular 3014LED in the market and application as an example. The traditional horizontal heat dissipation mode uses the commonly used 3528LED as an example for comparative analysis.
Figure 1 and Figure 2 are schematic diagrams of the vertical heat dissipation and horizontal heat dissipation LEDs, respectively. Figure 3 is a schematic diagram of the heat dissipation modes of the two LEDs.
Figure 1. Schematic diagram of vertical heat dissipation mode
Figure 2. Schematic diagram of horizontal cooling mode
Figure 3. Schematic diagram of horizontal and vertical cooling methods
It can be seen from the structural diagrams of FIG. 1 and FIG. 2 that the 3528 LED is radiated by soldering the electrodes of the electrodes at both ends, and the heat dissipation method is horizontal heat dissipation. The 3014 LED is structurally cooled by the heat dissipation channel of the bottom plate, and the heat dissipation mode is mainly vertical heat dissipation. Figure 3 more clearly shows the cooling mode of two different structured LEDs.
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