The lifetime of the driving power supply depends on the lifetime of the electrolytic capacitor of the power supply. The working temperature of capacitor in harsh environment will be higher than 95 C. Some people have also proposed whether ceramic or solid capacitors can be used, but the current capacitor technology can not be made into high voltage and large capacity. Of course, a good saddle needs to be equipped with a good horse, using long-life capacitors does not necessarily guarantee the life of power supply. To improve the life of power supply, we need to improve from many aspects: using high-life capacitors, improving power efficiency, doing a good job in the heat dissipation design of power supply, and optimizing the heat dissipation design of lamps and lanterns. In order to consider the compactness of lamp design in order to reduce weight, many lamp enterprises require that the volume of power supply be compact and installed in a closed space, and the heat dissipation condition of power supply is limited. Therefore, high efficiency, small size and better heat dissipation design are the challenges of LED power supply. In traditional lamps and lanterns, most of the power is converted into infrared radiation energy to radiate into the external space of the lamps, but the LED lamps and lanterns are different. LED is a semiconductor light emitting device. Except part of its power is converted to light energy, most of its power is converted to heat energy. These heat can only be dissipated by the lamp body which is tightly integrated with the chip. For the sake of the overall beautiful structure of lamps and lanterns, merchants often design the LED power supply and the structure of the LED lamp body closely together. The heating of the LED and the heating of the power supply are superimposed, so that both the power supply and the LED light source are in a bad working environment. When the temperature of the working environment exceeds a certain temperature, the life of the LED power supply and the LED is greatly reduced. When temperature protection is set inside the power supply, the phenomenon of repeated switching lights will occur. Without temperature protection, high temperature will damage the power supply devices and accelerate the light decay of the LED. LED power supply belongs to switching power supply. The quality and reliability of switching power supply depend on its circuit design, production process and device quality. Electrolytic capacitor is an indispensable part of high-power switching power supply. The normal working life of switching power supply depends on the life of the electrolytic capacitor used by the power supply, and the life of the electrolytic capacitor depends on the life of the capacitor itself and the working temperature. The working life of electrolytic capacitors varies greatly at different temperatures. Take a famous foreign brand electrolytic capacitor as an example: the life guarantee value of its general-purpose capacitor is 4000 hours (at 105 full load). If the maximum load value of capacitor ripple current is 85% in design, the life of capacitor can only be guaranteed about 80,000 hours at 65 C, about 40,000 hours at 75 C, about 20,000 hours at 85 C, and about 20,000 hours at 85 C. The life of the electrolytic capacitor can only be guaranteed about 10,000 hours at 95 C. It is estimated that the life of the electrolytic capacitor will be reduced by half for every 10 C rise. The working environment temperature of lamps and lanterns: In some areas, the outdoor surface temperature is as high as 40 C at night in summer, or even higher. Light self-temperature rise: Because the large amount of heat generated by the LED itself relies on the shell to dissipate heat, the reasonable design of its LED lamp shell temperature is about 20 - 25 C. That is to say, the temperature of the lamp shell is about 45 - 50 C under the working condition of 25 C at room temperature. Self-temperature rise of power supply: The temperature rise of power devices with better power supply design is about 25-30 C, and the temperature rise of poor design is more than 35 C. Outdoor LED power supply requires waterproof and sealed enclosure. In order to improve the protection level, manufacturers require glue filling. Different colloidal materials have different price and thermal conductivity. Also, inexpensive rubber has poor thermal conductivity and needs high temperature baking, which often causes different degrees of invisible damage and tension damage of components, leaving hidden dangers. (Poor heat dissipation makes the working environment of the electrolytic capacitor in the shell like a thermos bottle, and the accumulation of temperature can not be released.)