full wave ractifier
In full wave rectifier both the both half-cycles of the input are utilized with the help of two or four diode working alternately. For full-wave rectification, use of the transformer is essential (through it is optional for half-wave rectification).
Single-Phase Centre-Tap Full-wave rectifier
The full-wave rectifier circuit using two diodes and a centre-tapped transformer shown in Figure 1-1. The centre-tap is usually taken as the ground or zero voltage reference point.

Working
When input ac supply is switched on, the ends M and N of the transformer secondary become +ve and -ve alternately. During the positive half-cycle of the ac input, terminal M is +ve, G is at zero potential and N is at –ve potential. Hence, being forward-biased, diode D1 conducts (but not D2 which is reversed-biased) and current flows along MD1CABG. As a result, positive half-cycle of the voltage appears across RL.
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