Which of the following is a part of SMPS component?

The correct answer is option 1.

Block diagram of Switched Mode Power Supply (SMPS)

1.) Input rectifier

• The AC input from mains is first rectified in the SMPS using a rectifier to convert it into DC.
• The rectifier consists of a full wave diode bridge or module that produces an unregulated DC voltage to the Smoothing capacitor.
• The input AC passing into the rectifier has AC voltage pulses that may reduce the power factor. So control techniques are used to force the average input current to follow the sine wave

2.) Inverter

• This stage converts the rectified DC into AC using a power oscillator.
• The power oscillator has a small output transformer with a few windings at 20-100 kHz. A MOSFET amplifier controls switching. 

3.) Voltage converter

• This stage has a high-frequency transformer and the inverted AC drives its primary windings.
• This creates the up and down voltage at the output. If DC is required, the output AC is converted to DC using a rectifier circuit using Silicon diodes or Schottky diodes.
• The rectified output DC is then filtered using the filter section consisting of inductors and capacitors. 

4.) Output regulator

• The output stage always monitors the output voltage by comparing it with a reference voltage using a feedback system. 
• In some SMPS, Open loop regulation is used without a feedback circuit and constant voltage is fed to the transformer input.