Factors affecting the life of LED street lights
For enterprises, if they want to extend the service life of LED street lights, they must deal with the heat dissipation of LED chips. In this way, it can occupy an advantage in many LED street light products.
Generally speaking, (heat transfer) heat dissipation methods are mainly divided into heat conduction, heat convection and heat radiation. In simple terms: the heat generated by the LED chip first passes through the LED package structure, the circuit board, and the heat dissipation structure by heat conduction, and finally transfers the heat to the external environment by heat convection and heat radiation, and then reduces the internal heat of the lamp. Accumulation, the impact of lowering temperature on the energy-saving effect and lifespan of LED lamps.
For now, most of the LED street lights with aluminum heat sinks on the market only highlight the effect of heat transfer. In terms of heat convection and heat radiation, they have not been optimized due to various reasons such as technical limitations. planning.
LED street lights and other products adopt independent ceramic heat dissipation technology, and also fully consider these three basic (heat transfer) heat dissipation methods. In the study of the natural convection heat transfer mechanism of the heat dissipation structure, the cause of the fluid flow and the phase change of the fluid After in-depth discussions on the flow state of the fluid, the physical conditions of the fluid, and the geometric elements of the heat exchange surface, a "hollow structure" plan was proposed.
That is, while coordinating the function and beauty of the lamp, a different number of heat dissipation holes are opened on the upper cover and the bottom plate of the lamp. The heat inside the lamp is directly transferred to the radiator through the effect of heat conduction, and then the heat is emitted into the air through the effect of natural convection (a kind of convection method). That is, using the temperature difference between the inside and outside of the lamp, the density of the cold and hot air is different. The density of the hot air with high temperature is small, and it will inevitably increase; the density of cold air with low temperature is high, and it will inevitably decrease. In this way, the circulating flow between the hot air and the cold air makes the temperature uniform, and then completes the real-time heat generation to prevent the "heat island effect", lower the PN junction temperature, and increase the product life. In addition, natural convection, as a reliable forced heat dissipation method, does not require other auxiliary spare parts, has low protection cost, and is an efficient and reliable heat dissipation method.
