Class 12 Physics Semiconductor Electronics Half-wave Rectifier

Half-wave Rectifier

Circuit Diagram:

  • Transformer with primary and secondary coils
  • Diode
  • Load resistance RL
  1. The AC voltage to be rectified is connected between the primary of the transformer
  2. To one coil of the secondary , the p junction of the diode is connected
  3. The output is measured across the load resistance RL

 Input and output:

Working:

Case 1

  • During the positive half cycle of the input AC voltage, suppose P1 is negative and P2 is positive
  • On account of inductance, S1 becomes positive and S2 becomes negative
  • The p-n junction is forward biased and hence the resistance of the p-n junction diode becomes low
  • Hence, current flows in the circuit and we get output across the load resistance RL
  • This is indicated in the graph above

Case 2

  • During the negative half cycle of the input AC voltage, suppose P1 is positive and P2 is negative
  • On account of inductance, S1 becomes negative and S2 becomes positive
  • The p-n junction is reverse biased and hence the resistance of the p-n junction diode becomes high
  • Hence, no current flows in the circuit and we do not get any output across the load resistance RL
  • This is indicated in the graph above

The above process is repeated. Thus , we have current only in the positive half of the cycle. Hence, if is called as half-wave rectifier

The output signal is not continuous and available as bursts. Hence, this is not of much use.

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