Question

With the help of a circuit diagram, explain the working of a full wave rectifier.

Hint:

In a full wave rectifier, both halves of the AC input signal are used, resulting in higher average output voltage compared to a half-wave rectifier.

Answer 1

Step 1: A full-wave rectifier transforms both positive and negative halves of an AC signal into a pulsating DC signal. It employs two diodes that conduct during alternating half-cycles of the input AC.

Step 2: Circuit diagram of a full-wave rectifier:

Step 3: Full Wave Rectifier Operation:

During the positive half-cycle of the input AC, diode \( D_1 \) is forward-biased and conducts, directing current through the load resistor.

During the negative half-cycle of the AC input, diode \( D_2 \) becomes forward-biased and conducts, maintaining current flow through the load resistor in the same direction as the positive half-cycle.

This results in a pulsating DC output, with both halves of the input AC waveform contributing to the output.

Step 4: The output from a full-wave rectifier is a unidirectional pulsating signal. This signal can be smoothed using a filter, typically a capacitor, to achieve a steady DC output.