requirements of LED video screen driving power supply

According to the power consumption rules of the power grid and the characteristic requirements of the LED video wall screen driving power supply, the following performance characteristics shall be considered when selecting and designing the LED electronic screen driving power supply:
1. High reliability, especially the driving power supply of LED street lamp, which is installed at high altitude, inconvenient to maintain and expensive to maintain.
2. High efficiency LED is an energy-saving product, and the efficiency of driving power supply should be high. It is particularly important for the structure where the power supply is installed in the lamp. Because the luminous efficiency of LED decreases with the increase of LED temperature, the heat dissipation of LED is very important. The efficiency of the power supply is high, its power consumption is small, the calorific value in the lamp is small, and the temperature rise of the lamp is reduced. It is beneficial to delay the light decay of LED.
3. High power factor power factor is the requirement of power grid for load. Generally, there are no mandatory indicators for electrical appliances below 70 watts. Although the power factor of a single electric appliance with small power is lower, it has little impact on the power grid, but when we light the lights at night, the similar loads are too concentrated, which will cause serious pollution to the power grid. For 30-40 watt LED driving power supply, it is said that there may be certain index requirements on power factors in the near future.
4. There are two driving modes: one is a constant voltage source for multiple constant current sources, and each constant current source supplies power to each LED separately. In this way, the combination is flexible, and the failure of one LED will not affect the work of other LEDs, but the cost will be slightly higher. The other is direct constant current power supply, LED series or parallel operation. Its advantage is that the cost is a little low, but the flexibility is poor. It also needs to solve the problem that the failure of one LED does not affect the operation of other LEDs. These two forms coexist for a period of time. The multi-channel constant current output power supply mode will be better in cost and performance. Maybe it’s the mainstream direction in the future.
5. The anti surge ability of surge protection LED is relatively poor, especially the anti reverse voltage ability. It is also important to strengthen protection in this regard. Some LED lights are installed outdoors, such as LED street lights. Due to the start and fall of power grid load and the induction of lightning stroke, various surges will invade from the power grid system, and some surges will lead to the damage of LED. Therefore, the LED driving power supply should have the ability to suppress the invasion of surge and protect the LED from damage.