From the research, it shows that around 80% of failures are caused by the power supply. It increased the maintenance time and cost. So, how to choose a good LED display power supply?
1. we should choose a power supply with uniformity of the array of components is excellent.
2. The efficiency of the power supply. In the past, we prefer to choose power supplies with low output voltage and high current (such as 5V/60A applications) as the working voltage of LED lamp beads is low. For an example, the working voltage of LED lamp beads is 2.8 ~3.3V; red is 1.8~2.2V; blue is 3.0~3.2V; green is 2.9~3.1V; yellow is 1.8~2.0V, then we will choose 5V when designing standard power supplies.However, with the continuous development and innovation of the technology of LED components, the efficiency of the driver IC has also been continuously improved, and the power supply of the LED display will be converted to 4.5V/4.2V in the future. Judging the energy-saving level of the power supply is based on efficiency. When fully loaded as a good power source, it must be higher than 80%. The higher the efficiency, the less active power input.
3. Thickness of power supply. As narrow pixel pitch is widely used in hotels, exhibitions, video conferences etc, narrow pixel pitch like P1.9 or P1.5 is gradually becoming the mainstream of the market. The cabinet/panel is more and more light weight, thin structure,hoisting and quick disassembly/handling/installation.
4. The PFC value is also very important as efficiency. The PF value of the power supply without PFC function may be lower than 0.6. Low PF value will increase reactive power and cause huge power loss.
5. We need to ensure that the power supply has excellent stability, which will affect the stability and working life of the LED display. It can be expressed by ripple and temperature rise. A power supply with good stability must have low ripple and low temperature rise.
In addition, LED display often fail due to pollution, looseness, vibration, humidity, environmental temperature changes and other factors in their special application environment and use process. The power supply is the heart of the LED display. The reliability of the power supply by the customers the requirements are getting higher and higher. Due to the unpredictable changes in the installation environment, it is recommended to choose a power supply with moisture protection as much as possible for fixed outdoor LED display installations.