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  • Stands for Switch Mode Power Supply
  • Supplies power supply to every single part of the computer system.
  • Main function is to convert 230 Volts AC into 3.3V, 5V, 12V DC power.
  • Also ensures that system doesn't run unless the power supply is enough to operate the system properly.


  • To convert analog current to direct current using rectifiers and vice-versa using invertors. Similarly AC-AC using frequency changer and DC-DC using convertors.
  • To step up or step down unregulated dc input voltage to produce regulated dc output voltage.
  • To inverting and producing multiple dc output voltage for required parts using various converter.
  • Protection from short circuit and over load.

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Tip Box

Never try to repair SMPS yourself, if you dont know about it.




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