Draw and describe working of full wave rectifier using centre tapped transformer.

Draw and describe working of full wave rectifier using centre tapped transformer.
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1 Answer

Answer :

Full wave Rectifier with Center tapped transformer(FWR):

In full wave rectification, the rectifier conducts in both the cycles as two diodes are connected.

Circuit diagram:

image

Operation:

1. In positive half cycle (0-Π).

The end A of the secondary winding becomes positive and end B negative.

This makes diode D1 forward biased and diode D2 reverse biased. Therefore D1 conducts while D2 does not.

The conventional current flow direction in the upper half winding as shown in the fig above.

A – D1 – RL – O

2. In negative half cycle (Π-2Π):

End A of secondary winding becomes negative and end B positive. Therefore diode D2 conducts while diode D1 does not.

The conventional current flow is from as shown by the arrows in the above fig.

B – D2 – RL – O

From fig. current in the load RL is in the same direction for both half-cycles of input AC voltage.

Therefore DC is obtained across the load RL.

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