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In a half-wave rectifier, during the negative half-cycle of the AC source, the diode is:
Forward-biased
Reverse-biased
Conducting
Short-circuited
Reverse-biased
In a half-wave rectifier, the diode is arranged such that its anode is connected to the positive terminal of the AC source. During the negative half-cycle, the polarity reverses, making the anode negative with respect to the cathode, effectively reverse-biasing the junction.
In a half-wave rectifier, the diode is arranged such that its anode is connected to the positive terminal of the AC source. During the negative half-cycle, the polarity reverses, making the anode negative with respect to the cathode, effectively reverse-biasing the junction.
VDCтАЛ=╧АVmтАЛтАЛ тАФ Average DC output voltage
IrmsтАЛ=2ImтАЛтАЛ тАФ RMS current for half-wave rectifier
PIV=VmтАЛ тАФ Peak Inverse Voltage for a half-wave rectifier
The diode operates as a voltage-controlled switch. During the positive half-cycle, the diode is forward-biased and conducts current (IDтАЛ>0). During the negative half-cycle, the cathode potential exceeds the anode potential, preventing majority carrier flow and forcing the diode into a high-impedance state, where IDтАЛтЙИ0.
A half-wave rectifier uses only one diode for rectification.
The diode is in the OFF state during the negative half-cycle.
The Peak Inverse Voltage (PIV) rating of the diode must be at least the peak value of the AC supply voltage (VmтАЛ).
Efficiency is low due to the conduction occurring only for half the cycle.
Simple circuit construction
Low component count
Low rectification efficiency
High ripple factor
Low output power
Signal demodulation
Simple low-cost power supplies
The rectification efficiency of a half-wave rectifier is approximately 40.6%.
Option A is incorrect because the diode conducts only during the positive half-cycle when forward-biased.
Option C is incorrect because 'conducting' is synonymous with forward-biasing, which occurs only during the positive half-cycle.
Option D is incorrect as the diode acts as an open circuit (high resistance) rather than a short circuit (zero resistance) during the negative cycle.
B is correct тАФ During the negative half-cycle, the diode is reverse-biased, resulting in an open-circuit condition.
Remember that for a Half-Wave Rectifier, the PIV is VmтАЛ, whereas for a Full-Wave Center-Tapped Rectifier, it is 2VmтАЛ.