Vapor Chamber 기반의 LED 장치의 방열 특성 연구

Abstract

In the study, the thermal characteristics of LED floodlights, LED explosion-proof lighting, and LED displays were investigated using vapor chamber technology, which is a heat pipe principle. In the study of LED floodlight using vapor chamber technology, it was found that the thermal conductivity K value is improved by 66 to 182 % compared to the heat dissipation method using conventional heat sink only. In addition, the convective heat transfer h value was found to be 11 to 34 % improvement over the conventional heat dissipation method using only a conventional heat sink. This was analyzed as the result of heat transfer from the LED chip to the LED luminaire due to efficient conduction and convection. LED explosion-proof lighting using vapor chamber technology can reduce the temperature of LED chip area by 14.3 . At the surface temperature of the LED explosion-proof luminaire, it was found that the temperature difference was about 0.8 due to thermal parallelism due to the contact between the external surface and the external air. The thermal spreader of vapor chamber technology, which can be used for LED displays, is important to have stable heat transfer characteristics for long-term use. If the heat transfer property is poor, the heat is runaway due to thermal lamination, which causes damage to the device due to deterioration. Eventually, the LED display will be damaged. In order to drive it stably, the stable performance of the heat dissipation device is especially important. Thermal stacking can be intensified if the vapor chamber's performance to transfer heat continues to degression. Therefore, the heat transfer performance of the working fluid is of paramount importance. In the case of acetone-based vapor chamber, the heat transfer performance was decreased over time, whereas the vapor chamber using the Novec 7100 showed stable heat transfer characteristics. When the vapor chamber with effective and stable heat transfer performance is used in the LED display, the vivid image quality and stable function will be able to support the LED display's high quality and visibility for a long time.