Select Power Supply For Pixel LED
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There are many different types of power supplies available nowadays; you must select the right one for your needs. Linear power supplies and Switch Mode Power Supplies (S.M.P.S) are the two types of power supplies available on the market. Power Supply For Pixel LED.

Linear Power Supply

Linear Power supply
Linear Power supply

It’s a power source that regulates voltage via Linear Transformers. Mutual induction is the operating premise. Large transformers are used in these power supplies (Depending on the output current and voltage ). To convert the transformer’s AC output to DC. This power supply has half or full bridge rectifiers (depending on the transformer type) and then uses capacitors to smooth the voltage.

Switch Mode Power Supply (S.M.P.S)

Switch Mode Power Supply (S.M.P.S)

It’s a power supply that regulates voltage using specific transformers, a switching circuit, and a feedback circuit. Because this form of power supply employs high-frequency switching, we may lower the number of coil turns per winding, resulting in a smaller dimension. The AC supply voltage is converted to a DC voltage using a full bridge rectifier, after which the primary winding of the chopper transformer is switched in high frequency using a F.E.T, causing the secondary winding current to flow, and that voltage is converted to a DC using a single Schottky diode, after which the high frequency is filtered using a coil in series, and the voltage is smoothed using capacitors.

We employ S.M.P.S instead of linear power supply for pixel LED applications for a variety of reasons.

pros (S.M.P.S)

  • High efficiency.
  • Small in size.
  • less weight.

cons (S.M.P.S)

  • E.M.F interference.
  • R.F interference on close electronic equipment (LED lamps . other S.M.P.S ).

Voltage and Current

S.M.P.S rating for your Pixel LED project is determined by the following factors:

  • Number of LEDs.
  • LED Layout size.
  • Working environment.
  • Several LED controllers.

Voltage and Current Ratings of the Power Supply

LED strings and controllers often have a 5Vdc voltage rating (This may change with the controller model and Pixel LED string type). For the right voltage rating, contact your seller or the manufacturer.

How to calculate the power supply’s current rating requirement:

When a Pixel LED illuminates a white hue, the maximum current is drawn. Values of R.G.B (255,255,255). The current drawn by the Pixel LED is determined by the type of Pixel LED used. The driver chip’s current draw may be seen in the datasheet.

You may also verify the current of pixel LEDs by turning on a single Pixel LED without data and measuring the current it draws using a multimeter. Connect the multimeter probes to the LED and the power supply in series ( put the multimeter in Amp scale).

Measuring the single Pixel LED Current
Measuring the single Pixel LED Current

Let’s start by calculating the current taken by a single Pixel LED.

Current taken by one Pixel LED
Current taken by one Pixel LED

Let’s now compute the total current consumed by all of the Pixel LEDs.

Current taken by total Pixel LEDs
Current taken by total Pixel LEDs

Let’s calculate how much current the controllers consume.

Current taken by total Controllers
Current taken by total Controllers

Let’s compute the minimal current needed for the power supply.

Power supply minimum current  requirement
Power supply minimum current  requirement

Finally, let’s calculate the recommended Power supply current requirement.

Power supply recommended current requirement
Power supply recommended current requirement

We employ a safety factor of 50, which implies that the recommended power supply current is half of the minimum power supply current value. You may determine the power supply current needs using the formulae above.

Power supply network

It’s difficult to find a single power supply with significant current output capabilities if you’re working on a huge Pixel LED project. Don’t be concerned! There is no need to utilize a single power supply. You can utilize numerous power supplies to get the desired current rating, but be sure that all of the power supplies’ (-) or (GND) terminals are connected.

Here’s an example of a system with several controllers and a power supply.

Pixel LED Power supply network
Pixel LED Power supply network

We have three power sources in the preceding example, each having a 40A current output, resulting in a total current output of 120A.

Here’s an example of a different power supply powering Pixel LED strings.

Pixel LED Strings powered by separate Power supplies
Pixel LED Strings powered by separate Power supplies

In the above example, 3 sets of Pixel LED Strings are powered by separate 3 power supplies. The first LED of the string sets is connected to a separate 5V /40A power supply instead of a single 120A power supply. Make sure that the ( -) or the (GND) of every Power supply is connected.

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