Calculation method of switching power supply for LED display
Question 1: The power of PH10 and PH12.5 semi-outdoor unit boards: If the number of LED points (lights) of the two models is the same, their power is theoretically the same, but the size of the 12.5 unit board is larger than that of the PH10 unit The board size is large!
Power calculation method: 0.02A (current) * 5V (voltage) * 32*16 (number of LED lights) * 1/4 (number of scans) = 12.8W (power of the unit board)
Question 2: 12 P12.5 red semi-outdoor unit boards need a 5V40A switching power supply, and the power of 12 32*16-point PH12.5 unit boards: 12 * 12.5 = 153.6W. A 5V40A200W switching power supply can meet the working needs of 12 PH12.5 semi-outdoor unit boards!
LED display switching power supply a set of wires with several boards
A general 200W power supply can carry 16-20 boards. If you only have modules, you can carry it like this. But if you say that the one with the system card is not so much, you have to leave some margin for the system card. , because the system card does not require a lot of current, but has a higher requirement for voltage, it is recommended that the system card with 14 fast modules be the most. Of course, when your display screen is working normally, the greater the voltage drop of your multi-module power supply, the lower the service life of your power supply. The single light of your module is calculated as 20mA, and one module is 32*16*0.02/8 =1.28A plus 0.5 consumed by the board itself is 1.78A. You can only use 85% of the rated power supply, that is, 170W divided by 5V is equal to 36A divided by 1.78, which is approximately equal to 20 fast modules, which is the maximum ideal value. Generally, it is enough to carry 16 pieces. Your 1.5mm² line can only carry 12A at most, that is to say, your set of lines can carry up to 6 pieces. You can also use 2.5mm² lines to pass 22A. Calculate it yourself , although it is said that the current runs fast, but you also have to follow the average distribution, first to the actual situation, and then to the far, your power line can not be too long, or there will be a voltage drop or appear brighter near the power supply, away from it The ones are darker. Let's take a look at the actual situation.
