How SMPS Works ?

Basically, SMPS stands for “Switched Mode Power Supply”. It is an electronic device which is usually present inside System Case.  The main Function of SMPS is to convert high voltage AC into Low Voltage Regulated DC for the internal operation of the Computer.

When the Computer is turn on, the SMPS receives High Voltage A.C. (from the power supply)which is not suitable for Motherboard of the Computer. There may be More Chances of being damage of Motherboard and other Parts. As the Current (HIGH AC VOLTAGE) goes inside SMPS, the transformer converts high voltage A.C current into Low Voltage A.C current. The A.C current goes to the electronic Switching circuitry in which switching occurs 10MHZ-1KZ speed. Then The Low A.C is converted to High Voltage D.C. current. The high voltage D.C passes through different electronic components such as capacitor, resistor, and inductor inside the SMPS. Then the Output Becomes Low Constant D.C voltage which is suitable for Computer.  The SMPS sends the voltage (current) for the motherboard so the some peripherals can be powered. The motherboard receives Constant 5V Standby (5VSB) from SMPS and gives to other parts of computer. The Feedback controller (FC) indicates whether the Motherboard requires power or not. If the power is not required for the Motherboard then the Feedback Controller sends the signal to SMPS not to send Power or Voltage. The SMPS Stores the Converted voltage (charges) inside it by the help of capacitor and inductor. So it can provide to the Motherboard whenever required.

 As compared to Linear Power Supplies, the SMPS is popular and suitable for most Computer devices. Because the SMPS has safety Features like Current Limiting which doesn’t let any devices or part of Computer to be damage.

So, In this way the SMPS works.