Diode Conduction in Full Wave Rectifier

A full wave rectifier converts the entire input AC waveform into a pulsating DC output. This is achieved by using diodes to conduct current during both the positive and negative half-cycles of the input AC supply.

Rectifier Operation Principle

In a full wave rectifier circuit (either center-tapped or bridge type), the diodes are arranged such that:

• During the positive half-cycle of the input AC voltage, one set of diodes conducts.
• During the negative half-cycle of the input AC voltage, the other set of diodes conducts (or the same diodes conduct if only two are used in a specific configuration, but the principle remains).

This ensures that current flows through the load in the same direction for both halves of the input cycle.

Diode Conduction Period

Consequently, each diode in a full wave rectifier setup is active and conducts current only during one specific half-cycle (either positive or negative) of the input AC waveform. When the input polarity reverses, the conducting diode becomes reverse-biased, and the other diode(s) become forward-biased and conduct. Therefore, a diode conducts for alternate half cycles.