Power supplies regulate the electrical current that powers your LED display. In this way they transform the standard 220-110V current to suitable voltage and power levels to operate the screen. In each frame or cabinet you will find several power supplies that receive and emit electric current through their connection terminals.
The electronics of LED panels are delicate, so it is necessary to use specific power supplies so that all its components are not damaged and can last for many years. We choose power supplies according the power they offer. This power is reflected in Amperes (A), the higher the value, the more power the source will have. To know the equivalence in Watts (w), it is necessary to multiply the amperes by the value of the output voltage of the source. In other words, if the source offers 40A for an output voltage of 5 volts in continuous, the power that this source will offer will be 40A x 5V = 200w. In general, a LED screen power supply must meet a series of requirements:
– 5V DC stabilized output
– 110-220V AC input
– 5V DC outputs divided into two or three outputs.
– Total power between 200-450W
– Output amps between 40-60A
– CE manufacturing certifications
There are many power supply manufacturers for LED screens, although in the last 10 years the technical evolution has been minimal, and most manufacturers share the same components in their power supplies, certain brands have been highlighted thanks to their performance in marketing and promotion.
L (line): phase terminal or alternating current line at 220V – 110V brown power cable according to Spanish standard.
N (neutral): neutral terminal of alternating current at 220V – 110V blue power cable according to Spanish standard.
Earth: Earth connection of the network. Yellow and green cable (according to Spanish standard)
V-: direct current output (negative pole)
V +: DC output (positive pole)
Note: Depending on the source model, the terminals may differ in their position and appearance.
Each frame of your LED screen has a pre-installation that interconnects power supplies. In this way you only have to connect a power supply from each cabinet to the network and the rest of the sources of the frame will be fed as well. Select an easily accessible source in each of the frames and connect terminals L, N, and Earth with the wiring of your installation. We recommend using, whenever possible, a specific electrical panel for the screen without grouping more than 3 or 4 frames for each supply.
The power value of a power source is the ideal value offered by a source, but, the sources offer much lower real values, what we call real or effective power. These losses in power are due to various factors, such as fluctuation of the input voltage, parasites and harmonics in the network, environmental temperature, workload required, etc. … The manufacturers of the sources usually offer their technical specifications, graphs on efficiency with respect to the workload of the source.
Energy efficiency is the maximum real power that a power supply represented in % can offer.
Sources experience “losses” during their operation and fail to offer full power at the exit for technical reasons. This means that a power supply cannot give 100%. This is where we can see the different qualities existing in the supplies: a source marked as 350w can have an efficiency of 80% and another that is also 350w can have an efficiency of 60%. When doubting between these two sources, the one that will offer the best performance will be the one that gives 80%, even if the two mark the same consumption power.
Well, this data is the most important when choosing the right source. Sources with poor efficiency values are cheaper, so at first it seems a good option, but when the time comes to calculate the feed for LED modules, we will realize that we need many more units than using more efficient sources of energy. This means that using sources of highly efficient sources of power improves the consumption of our screens and reduces the interior temperature of the screens.
Power supplies emit heat during their operation, this heat is caused by its components during operation. As in any other electronic component, its main enemy are high temperatures, this is what cooling systems and temperature dissipation are designed for. On the one hand, if the source is of low power, the outside air itself allows its correct dissipation, these are the sources called passive dissipation and are usually used in indoor screens or for shops. High power sources use fans that act when the temperature of the source exceeds a threshold, immediately cooling their components. These are called sources with active cooling systems. This type of sources are used in outdoor or high brightness screens.
The electronic components of a LED screen are quite delicate so using quality power supplies is paramount, since they not only convert AC voltage to continuous, but also filter and stabilize it. With quality sources we give the electronic components greater durability and avoid continuous problems of operation.