The right power supply for large pixel installations.
Take, for example, 5 volts WS2811 pixel chains or WS2812b pixel strips, then you quickly reach the limits of the used power supply. For a pixel needs 0.06A (60mAh) at full power and the color white. The reason for this is that the color white is created by mixing the three colors red, green and blue.
A normal WS2811 pixel chain with 50 pixels therefore requires white whole 3A.
If, for example, the Advatek PixLite 16 MkII is connected to its 16 outputs with 1,020 WS2811 / WS2812b pixels as the controller, this means 1,020 x 0.06A => 61.2A. The controller itself, however, only tolerates 4A per output, so would be a "little bit" overloaded.
To work around this, there are several constellations. I would like to introduce two today:
1. Power only to the pixels
In this constellation, only one power supply is connected to the controller for powering the controller. Thus only DATA and GND (-) are used at the direct output to the pixels. The strips / chains are supplied separately with one or more power supplies.
One 70 A power supply per strand:
Two 40 A power supplies per strand:
2. Power supply partly via the controller, partly at the pixels.
Here, the aforementioned 4A per output should not be exceeded! So there are max. 66 pixels at 100% possible which can be secured directly via the controller.
The extra supply of + and GND (-) after each chain is necessary as each chain has its resistance. Thus, at the end of the chain, 5 volts will no longer be present, resulting in flickering or non-clean colors (e.g., red turning orange). Through the re-feeding the complete strand is supplied evenly. The procedure is analog at 12V pixels. The choice of pixels can be found here.