Industry insiders teach you how to choose LED display power supply
First, look at the appearance process to select the LED display power supply. A good power supply manufacturer is also very strict with the workmanship process, because it can guarantee the batch consistency of the products. An irresponsible manufacturer, the appearance of the power supply, the tin surface, the alignment of the components will never be good.
Second, select the LED display power from the full load efficiency. The efficiency of the power supply is the most important indicator. The high-efficiency power conversion rate of the power supply is high, which not only meets the requirements of energy saving and environmental protection, but also can save power and save money for the user.
Third, the output voltage ripple of the constant voltage power supply is large. The size of the ripple has a very large effect on the life of the electrical equipment, and the smaller the ripple, the better.
Fourth, observe the temperature rise of the power supply to select the LED display power. The temperature rise affects the stability and life of the power supply. The lower the temperature rise, the better the temperature rise. In addition, it can be seen from the aspect of efficiency that the general efficiency and high temperature rise will be small.
Fifth, due to the properties of the LED display products, the instantaneous change of current is usually generated when playing video or picture, which puts more stringent requirements on the LED power supply . Usually, in order to ensure the normal broadcast of the display screen, a certain margin is reserved for the power supply product. In general, the more the margin is reserved, the more stable the performance of the power supply product is, and the longer the life is. However, this increases the cost of the power supply product, and too much margin is also easy to waste. At present, the industry's LED display power supply is generally reserved for 20% - 30% of the margin.
Sixth, in order to increase the life of the power supply, it is recommended to use a model with more than 30% output power rating. For example, if the system requires a 100W power supply, it is recommended to select a model with an output power rating greater than 130W, and so on, which can effectively improve the life of the power supply.
Seventh, according to the application field, select the power of each function, such as protection function: over voltage protection, over temperature protection, overload protection, etc.; application functions: signal function, remote control function, telemetry function, parallel function, etc.; special function: work Due to correction (PFC), continuous power (UPS).
Secondly, the LED display power supply is selected. At the same time of stabilization, dynamic response and interference elimination are also required. Brand issues for LED display power. Some people think that the current LED display power technology has matured, no matter what the choice, the power supply drawings are open. Many so-called advanced power supplies are nothing more than adding some protection and anti-surge designs, which are basically redundant in areas with stable voltages. Finally, in addition to the LED display bead quality is the determining factor affecting light decay, junction temperature is an important external factor, so an important way to reduce light decay is to improve its heat dissipation. Using constant voltage power supply will increase the junction temperature, increase the light decay, shorten the life, and supply power to the LED. It must be powered by a constant current power supply. After the current is constant, no matter how the temperature changes, the current does not change! The junction temperature will not viciously cycle! This depends on the quality of the power control current.
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