POWER SUPPLY

OBJECTIVE

Learn basic of Power Supply (block diagram).

To understand how Power Supply  works.

CONTENT

POWER SUPPLY

- Most are designed to convert high voltage AC mains electricity to a suitable low voltage supply for electronics circuits and other devices.
-  For example a 5V regulated supply: 

Block Diagram of a "Power Supply"

A Simple 5V DC Regulated Power Supply

• Transformer - steps down high voltage AC mains to low voltage AC.
• Rectifier - converts AC to DC, but the DC output is varying.
• Smoothing - smooths the DC from varying greatly to a small ripple.
• Regulator - eliminates ripple by setting DC output to a fixed voltage.

TRANSFORMER ONLY

The low voltage AC output is suitable for lamps, heaters and special AC motors. It is not suitable for electronic circuits unless they include a rectifier and a smoothing capacitor.

TRANSFORMER + RECTIFIER

The varying DC output is suitable for lamps, heaters and standard motors. It is not suitable for electronic circuits unless they include a smoothing capacitor.

TRANSFORMER + RECTIFIER + SMOOTHING

The smooth DC output has a small ripple. It is suitable for most electronic circuits. 

TRANSFORMER + RECTIFIER + SMOOTHING + REGULATOR

The regulated DC output is very smooth with no ripple. It is suitable for all electronic circuits.

CONCLUSION
Power Supply operation have Transformer + Rectifier + Smoothing + Regulator.
Next further info, each block operation of Power Supply.