The insiders know that LED fluorescent lamps will become a new generation of energy-saving and environmentally-friendly lighting, but now the country produces at most hundreds of thousands of LED fluorescent lamps every year, and most of them are exported. There are very few domestic uses. In fact, the most important problem is the price problem. An ordinary energy-saving fluorescent light is fixed for more than ten yuan, and one LED fluorescent tube has hundreds of pieces. Therefore, the current fluorescent tubes are mainly based on commercial lighting. Because commercial lighting will take into account energy conservation, environmental protection, image, government support and so on.
But now the quality of LED fluorescent lamps is uneven, and some even have the same lifespan of fluorescent lamps, which can't be used. As users know more and more about LED fluorescent lamps, LED fluorescent lamps manufacturers need to solve the following problems. :
First, the constant current driving problem of the driving power supply. At present, most of the constant current sources are mostly constant currents (that is, a plurality of parallel light strings share a constant current source. Because of the difference in resistance between the LED beads , the current of each string is different, any one LED If the lamp fails, it will affect the current of other strings, so those with large current will have more serious light decay and their service life will be greatly shortened.)
Second. The problem of heat dissipation. This is one of the core issues in the life of LED fluorescent tubes. Because most manufacturers now use the built-in power supply to follow the wind, they can be directly replaced with fluorescent tube brackets, so that the heat emitted by your entire power supply and the heat emitted by the LED itself are dissipated in an aluminum housing, and they are all inside the fluorescent tube. How to deal with the heat?
Third. The problem of the life of electrolytic capacitors in the power module? Even if we use ultra-long-life electrolytic capacitors, working at high temperatures, its life cannot be balanced with the life of the LEDs. But how to provide a good working temperature to achieve the best service life?
Fourth. Can the power module's instability and product safety certification pass? At present, most manufacturers on the market use high-voltage non-isolation schemes and high-voltage counterattack Tianguan power schemes. Because the built-in volume is very limited (to be placed inside the lamp), it is generally difficult to implement the power supply during design. stable. At present, various countries have stricter safety certifications, and it is difficult to pass the safety certification of high-voltage power supply.
In fact, the main source of the above problems is still generated by the built-in power supply!
We know that the life of small power LEDs is very long, but the LED life problem has only been raised when LEDs are used as lighting devices. In fact, the life of an LED depends entirely on its junction temperature. As long as the junction temperature is low enough, it is no problem to increase the lifetime of the LED to more than 100,000 hours. However, since the luminous efficiency of the LED itself is still relatively low, about 70% of the input power is converted into thermal energy. If the heat is not well dissipated, the junction temperature of the LED will rise, and the life of the LED will be It is reduced accordingly. So the fundamental way to extend the life of LEDs is to improve their heat dissipation. Improve heat dissipation from the LED itself. The 3014 mentioned above is to improve the heat dissipation by increasing the metal area of ​​the bottom plate, so that the thermal resistance is reduced to only 51 ° C / W. As long as the heat sink is done well enough to ensure that the pin temperature is below 60 ° C, its life can be guaranteed above 50,000 hours. Our measured results also prove this point. At room temperature of 25 degrees, we measured the surface temperature of the aluminum heat sink to be about 35 degrees. If it is at 45 degrees ambient temperature, the surface temperature of the heat sink should be 55 degrees because A fan-shaped aluminum-plastic tube is used, and the thermal resistance of the aluminum substrate and the aluminum heat sink is about 50 ° C / W. So the temperature to the LED backplane is about 60 degrees. Therefore, it can guarantee a life of more than 50,000 hours.
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