Question

Draw the circuit diagram of a full wave rectifier and state how it works .

Answer 1

Full wave rectifier$:-$ For full wave rectifier we use two junction diodes$.$ The circuit diagram for full wave rectifier using two junction diodes is shown figure$.$

Suppose during first half cycle of input ac signal the terminal $S_1$ is positive relative to $S$ and $S_2$ is negative relative to $S,$ then diode $I$ is forward baised and diode $II$ is reverse baised$.$ Therefore current flows in diode $I$ in load resistance $R_L$ is directed from $A$ to $B.$ In next half cycle$,$ the terminal $S_1$

is negative relative to $S$ and $S_2$ is positive relative to $S.$ Then diode $I$ is reverse baised and diode $II$ is forward baised$.$ Therefore current flows in diode$II$ and there is no current in diode $I.$ The direction of current $i_2$ due to diode$II$ in load resistance is again from $A$ to $B.$ Thus for input $a.c.$ signal the output current a continuous series of unidirectional pulses$.$ This output current may be converted in fairly current by the use of suitable filters$.$