The input and output waveforms of the center-tapped full wave rectifier are as follows.įrom the above figure it is evident that the output is obtained for both the positive and negative half cycles. We now have the positive half cycles in the output, even during the negative half cycles of the input. Hence current $i_2$ flows through the load resistor from A to B. This makes the diode $D_2$ forward biased. When the negative half cycle of the input voltage is applied, the point M at the transformer secondary becomes negative with respect to the point N. We now have the positive half cycles in the output

Hence current $i_1$ flows through the load resistor from A to B.

This makes the diode $D_1$forward biased. When the positive half cycle of the input voltage is applied, the point M at the transformer secondary becomes positive with respect to the point N. The working of a center-tapped full wave rectifier can be understood by the above figure. The circuit diagram of a center tapped full wave rectifier is as shown below. The center-tapped transformer with two rectifier diodes is used in the construction of a Center-tapped full wave rectifier. The center tapping provides two separate output voltages which are equal in magnitude but opposite in polarity to each other.Ī number of tapings can be drawn out to obtain different levels of voltages. The voltage at the tapped mid-point is zero. This winding is split into two equal halves by doing so. The tapping is done by drawing a lead at the mid-point on the secondary winding. The features of a center-tapping transformer are − The transformer is center tapped here unlike the other cases. Center-tapped Full-Wave RectifierĪ rectifier circuit whose transformer secondary is tapped to get the desired output voltage, using two diodes alternatively, to rectify the complete cycle is called as a Center-tapped Full wave rectifier circuit. Let us now go through both of their construction and working along with their waveforms to know which one is better and why. They areīoth of them have their advantages and disadvantages. The construction of a full wave rectifier can be made in two types. A Rectifier circuit that rectifies both the positive and negative half cycles can be termed as a full wave rectifier as it rectifies the complete cycle.

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