SMPS

SMPS:
Switched Mode Power Supply.

SMPS removed from CPU

What is SMPS:
Device which provides power to electrical load and involves some kind of switching action.

How SMPS works:
Electronic supply includes switching regulator converts electric power from one form to another.

Switching regulator:
Switches a series device on and off.

Function of SMPS:
Convert wall voltage AC power to lower voltage DC power.

AC or DC power:
Convert input voltage to higher or lower.

Why we use SMPS:
Works at higher frequencies.
Use smaller parts than transformer.
Faster reaction time.
No need of using big capacitors.

Block diagram of SMPS:

Testing whether SMPS is working or not:

Remove SMPS from CPU

20 pin ATX power supply in that seperate green and black wires

Take small piece of wire and connect in green and black wires holes.

Connect power supply cable switch on and check if SMPS fan is rotating SMPS is working if fan is not rotating SMPS is dead.

Types of SMPS:
DC to DC converter.
AC to DC converter.
Forward converter.
Flyback converter.

DC to DC converter:
Converts source of D.C from one voltage level to another.
High voltage D.C power is directly acquired from D.C power source.
   

AC to DC converter:
A.C input and it is converted in to D.C by using rectifier and filter.

Forward converter:
Transformer to increase or decrease the output voltage.

Transformer:
Transforming power from one circuit to another with out changing frequency.

Flyback converter:

Buck-boost converter with inductor split to form a transformer.

Inductor:
Stores electrical energy in a magnetic fields when electric current is flowing through it.

Advantages:
Greater efficiency.
Small size.
Light weight.
Better power efficiency.
Low heat generation.

Disadvantages:
More complexity.
Electrical noise.
One output voltage.
Harmonic distortion.

Applications:
Machine tool industries.
Security systems.
Personal computers.
Mobile phone chargers.