Full-Wave Rectifier

Full-Wave Rectifier

1. In full-wave rectification, current flows through the load in the same direction for both half-cycles ofinput a.c. voltage. This can be achieved with two diodes working alternately.

   • Centre-Tap Full-Wave Rectifier
     • The circuit employs two diodes D1 and D2
       • During the positive half-cycle ,the diode D1 forward biased and diode D2 reverse biased.
         • Duringthe negative half-cycle, diode D2 conducts while diode D1 does not
           • The current in the load RL is in the same direction for both half-cycles of input a.c. voltage.
             • Peak Inverse Voltaje
               • P I V = 2 Vm
   • Full-wave bridge rectifier
     • It contains four diodes D1, D2, D3 and D4 connected to form bridge
       • Operation
         • During the positive half-cycle of secondary voltage, the end P of the secondarywinding becomes positive and end Q negative. Therefore, only diodes D1 and D3 conduct.
           • During the negative half-cycle of secondary voltage, end P becomes negative and end Q positive. Therefore, only diodes D2 and D4 conduct
             • Peak Inverse Voltaje
               • P I V = Vm
   • Output Frequency
     • The output frequency of a full-wave rectifier is double the input frequency.
   • Efficiency
     • The efficiency will be maximum if rf is negligible as compared to RL

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