Best Tutorial on SMPS.

In this tutorial we are going to learn about Best Tutorial on SMPS.

SMPS – SMPS (Switch Mode Power Supply): As the name suggests, it is a device which provides power to any electrical load and involves some kind of switching action.

Why Use SMPS: As we know that linear power supplies become very bulky with increase in its current rating. So, we needed something which will allow us to handle large amount of current without taking a lots of space. SMPS is the solution for that.

SMPS works on very high frequencies as compared to linear power supplies and as the size of transformer reduces with increase in frequency, the overall size of an SMPS become very small as compared to linear power supplies.

Main Pars of SMPS:

AC Filter & DC Filter: The input and output stages of a SMPS system have capacitors & Inductor which is works as filter for reduces noise. At the input side for use removes AC noise and output side use for DC noise remove so that can get pure DC. It is combination of L & C so that it called LC filter which is use to reduce noise & ripple for input & output.

Rectifier – In SMPS for convert AC to DC use rectifier which convert AC into DC, Output voltage of rectifier is equal to √2*AC. Suppose that AC input AC is 220 AC then rectifier output DC will be √2*220.

Transformer – Switch mode power supply (SMPS) transformers are a highly efficient form of transformer, which is used in devices like personal computers. A switch mode power supply is an electronic power supply that incorporates a switching regulator to efficiently convert electrical power.

DC filters Feedback Circuit – It is to use measure the output voltage (or current), compare it to a desired value and use the error between them to adjust the switching pattern of the switch, until the error becomes zero or close enough to zero.

Working of SMPS:

  • SMPS work on High frequency.
  • Need to increase the frequency of 50 Hz input.
  • First convert the AC input to DC first and then chop it at high frequency to get the pulsating DC output which is them applied to rectifier and filter.
  • Feedback helps to maintain the level of output signal.

SMPS Advantage

Small size

Low noise

High efficiency (80 –95%)

SMPS disadvantage

High complexity

Produce EMI

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