Sketch block diagram of an unregulated power supply and explain function of each block.

Sketch block diagram of an unregulated power supply and explain function of each block.
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1 Answer

Answer :

Block diagram of regulated DC power supply:- 

image

Explanation

1)Transformer

2) Rectifier

3) Filter

4) Voltage regulator.

1. Transformer:- Transformer can be step up or step dow. Depending on requirement. The AC main voltage is applied to a transformer. It will increase or decrease the amplitude of ac voltage to the desired level and applies it to a rectifier.

2. Rectifier: The rectifier is usually a centre tapped or bridge type full wave rectifier. It converts the ac voltage into a pulsating dc voltage.

3. Filter: The pulsating dc (or rectified ac) voltage contains large ripple. This voltage is applied to the filter circuit and it removes the ripple. The function of a filter is to remove the ripples to provide pure DC voltage at its output.

The DC output voltage thus obtained will change with the changes in load current,input voltage, etc. So it is unregulated DC voltage.

4. Voltage Regulator:- The unregulated DC voltage is applied to a voltage regulator. Output of the regulator circuit will be constant voltage under all operating circumstances.


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