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In a half wave-rectifier a single diode exists and the load current flows through it for only the positive half cycle.On the other hand,in a full wave rectifier,the current flows throughout the cycles of the input signals.
Full wave rectifiers have some fundamental advantages over their half wave rectifier counterparts. The average (DC) output voltage is higher than for half wave, the output of the full wave rectifier has much less ripple than that of the half wave rectifier producing a smoother output waveform.The main advantage of this bridge circuit is that it does not require a special centre tapped transformer, thereby reducing its size and cost. The single secondary winding is connected to one side of the diode bridge network and the load to the other side.
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