LED panel light heat dissipation problem
Another structure type of LED panel light is evolved from the side light guide light guide plate light box for advertising purposes. Due to the use of LED's thinner and lighter characteristics than fluorescent tubes or CCFL tubes, its product structure can be achieved. Very thin. Throughout the development history of LED panel lights, most companies take this as the starting point. One of the listed companies in Hong Kong has invested a considerable amount of advertising on this since 2005. Obviously, LED panel lights have been used by more and more people since then. The industry's attention.
Widely used in hospitals, schools, supermarket chains, offices, office buildings, bars, hotel decoration, home lighting, lamps and lanterns, engineering lighting, parking lots, western restaurants, cafes, clubs, showcases, exhibition halls, art halls, museums, etc. Ambient decorative lighting
Since the LED panel light cannot be dissipated by fans or natural convection heat dissipation, not to mention the LED heat dissipation design must also meet the optical requirements of LED lighting fixtures. In addition, the LED heat dissipation design must also meet the needs of the lamp shape. Only in this way can LED lighting have a better selling point, and the lamp shape limits the heat dissipation design of the LED. If the optical efficiency is reduced in order to facilitate the dispersive arrangement of the heat dissipation light sources, it is a bit of a loss. Since the heat dissipation cost of LEDs is very high, the volume and weight limit LED lighting fixtures that cannot be filled with a large amount of high thermal conductivity materials.
In LED panel lights, there are three basic steps of heat conduction, chip to epitaxy, epitaxy to package substrate, substrate to heat sink or chassis. The current technical problem of LED heat dissipation is that the LED junction is limited by temperature. High temperature will reduce the life of LED chips, phosphors, and encapsulation resins. In order to keep the advantages of "high efficiency" and "long life" of LEDs, the junction temperature of LEDs must be controlled.
Then the choice of thermal conductive materials to solve the problem of heat dissipation technology is particularly important. Among them, the selection of thermal conductivity materials must be taken into account at the beginning of the design of LED panel lights, which is the first step of the Z foundation. Therefore, the selection of thermal conductivity materials is also the first step to achieve high efficiency and long life of LED lamps.
Thermally conductive materials include: high thermal conductivity silicone sheet, thermally conductive silicone grease, thermally conductive phase change materials, etc. Among them, thermally conductive silicone sheets and high thermally conductive silicone gaskets are the most cost-effective and are the first choice for thermally conductive and heat-dissipating materials.
LED lights have the advantages of no pollution, low power consumption, energy saving and environmental protection, and are widely used in various fields. The existing LED purification lamp housing usually consists of a lampshade and a base. The lampshade covers the base, and the connection between the lampshade and the base must be seamlessly connected to ensure that the light source is not affected by the external environment, so that the light can be injected into the space more softly and evenly; the LED lamp is placed on the base. Since the base is usually a metal piece, the light cannot be transmitted from the base, only through the lampshade, and part of the light emitted by the LED lights on the base is transmitted through the reticle. When going out, the other part is blocked by the base, and the light transmission is blocked, resulting in a small beam angle and shadows in dead corners; in addition, because the base is made of metal, it is heavy and the installation is not firm, which increases the risk of the LED purification device falling. On lamps, there is also a risk of electric shock.
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