I don’t know if you have noticed it—the giant screens that play advertisements in shopping malls, the large circular screens that broadcast in real time in sports venues, and their power systems are as important as the heart of the human body. I have seen many novices who only care about looking at the pixel density and display effect when purchasing a display screen. As a result, the device has black screen and flash screens in less than half a year of use. In the end, it was found that there was a big problem with the power system. Today we will break it apart and talk about what are the ways to power LED displays?

​​1. Why has the power system become the life gate of the display screen?​​
You may not believe it if you say it, more than 80% of the faults of the display are related to the power supply system. Imagine that you bought a 4K HD screen that costs a lot of money, and the driver chip burns out due to unstable power supply voltage, which feels as bad as the engine of a newly bought sports car explodes. Especially for outdoor display screens, they must withstand heavy rainstorms and thunderstorms and lightning, and also work stably at high temperatures of 40 degrees, which is the ultimate test for the power supply system.

The fence screen project our company has encountered extreme situations for Tokyo Stadium. At that time, the environmental humidity on site soared to 95%, and ordinary power supplies had already gone on strike, but our customized intelligent power distribution system had withstood the high-intensity operation for 72 hours. This is why professional manufacturers regard the power system as more important than the display itself.

​​2. How to choose the most reliable power supply solutions?​​
It is most likely for novices to get into a trap here, remember these three golden rules:

1. ​​Distributed power supply​​: Just like installing a separate meter in each room in your home, it is suitable for a small display. A single power supply does not affect the whole, but the wiring is as complicated as a spider web
2. ​Centralized power supply​: The preferred solution for large screens is similar to the main distribution box used in the entire building. The curved advertising screen we made for Singapore uses n+1 redundant design, so even if the power supply is broken, it can still broadcast normally
3. ​​Hybrid power supply​: The compromise solution is to divide the screen into several areas to supply power separately. This is how the transparent window screen made for Korean shopping malls last year is done, and there is no need to cut off the power in full screen during maintenance.

​​3. The great knowledge in power supply parameters​
Look at the numbers on the power parameter table and focus on these four indicators:

• ​Output voltage​: 5V is the industry benchmark value. For example, our dance floor tiling screen uses a new 4.5V solution, which can save 15% of electricity bills.
• ​Output current​: Don’t just look at the total current value, pay attention to the instantaneous peak value. The power supply of the stadium fence screen can withstand 3 times instantaneous overload, which is the real thing
• ​Conversion efficiency​: With a direct pass below 80%, a good power supply can cut the electricity bill by 30%
• ​Power factor​: Power supply with APFC function does not panic when encountering voltage fluctuations, just like installing a voltage regulator.

​​4. Hidden skills for installation and maintenance​
Last week, a customer complained that the display was always flashing, but it turned out that the power cord was leaving next to the signal cord. Remember these tips for saving lives:

1. The power cord should be thick enough, just like the blood vessels are too thin and insufficient blood supply
2. The ground wire must be grounded at a single point, otherwise it will be the same as the mobile phone signal interference.
3. The distribution cabinet must be equipped with intelligent monitoring, which can remotely adjust the brightness and automatically extinguish the fire. This money cannot be saved.
4. Remember to install lightning arresters on outdoor screens. All the projects we do in tropical areas are equipped with three-level lightning protection standard.

​​Self-question time​
Q: Is the power label 500W enough?
A: Never beacon nominal value! In fact, 30% of the margin must be left. For example, the peak power consumption of the display screen is 400W, and at least 600W power supply is the same as buying a car, it depends on the maximum load.

Q: How to judge the power supply quality?
A: Get started with the temperature. After running for 1 hour with full load, change the shell temperature exceeding 60 degrees. During our laboratory test, we will put the power supply in a 70-degree oven for 48 hours, and only those who pass the test dare to use it

Q: What should I do if I encounter unstable voltage?
A: The installation of the voltage stabilization module is the basic operation. A more advanced approach is to use smart distribution systems. The projects we have done for Middle Eastern customers can withstand ±15% voltage fluctuations, and the power grid fluctuations in desert areas can be handled.

The editor finally said something heart-wrenching: Instead of spending a lot of money on repairs later, it is better to design the power system in place from the beginning. Those display screens that can operate stably for more than 5 years have a reliable power supply solution behind them. Next time you choose a display screen, remember to ask about the power configuration first - this is the real valuable hard power!

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