मराठी

p-n Junction Diode as a Rectifier - Half Wave Rectifier

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Estimated time: 4 minutes
CBSE: Class 12
Maharashtra State Board: Class 11

Definition: Half-Wave Rectifier

  • A rectifier that consists of one p-n junction diode in which alternate pulses of AC input are rectified, having a maximum efficiency of 40.6% and output frequency the same as that of input, is called a Half-Wave Rectifier.
  • A rectifier which rectifies only one-half of each AC input supply cycle is called a half-wave rectifier.
CBSE: Class 12

Key Points: Half Wave Rectifier

  • A half-wave rectifier uses a single diode, allowing current to flow in one direction, with an AC power source\[V_{ac}\] connected to the diode and a resistor in series.
  • Output is discontinuous and pulsating DC - only positive half cycles appear across the load.
  • Alternative (negative) half cycles of the AC supply go to waste, making efficiency very low.
  • The output waveform shows only the positive side of the sinusoidal cycle, clamping off the negative side.
  • Circuit components: transformer (primary & secondary), single diode, and load resistor \[R_L\].
  • A transformer is used to step up or step down the AC voltage before rectification.
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