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Chapter 1 of 12 • Page 1 of 248🔒 Protected PDF • Watermarked
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The most widely used rectifier is ______.
Half-wave rectifier
Centre-tap full-wave rectifier
Bridge full-wave rectifier
None of the above
Bridge full-wave rectifier
Quick Summary: The bridge full-wave rectifier is the most widely used configuration because it provides full-wave rectification without the need for a bulky, expensive center-tapped transformer. It utilizes four diodes arranged in a bridge configuration to utilize both halves of the AC input cycle.
The bridge full-wave rectifier is the most widely used configuration because it provides full-wave rectification without the need for a bulky, expensive center-tapped transformer. It utilizes four diodes arranged in a bridge configuration to utilize both halves of the AC input cycle.
Vdc=π2Vm — Average (DC) output voltage
Idc=π2Im — Average DC load current
RippleFactor=(VdcVrms)2−1≈0.48
During the positive half-cycle, two diagonally opposite diodes conduct, allowing current to flow through the load in one direction. During the negative half-cycle, the other two diodes conduct, maintaining the same direction of current flow through the load. This ensures the output across the load is always unipolar, achieving higher efficiency than half-wave circuits.
Bridge rectifiers do not require a center-tapped transformer, reducing overall weight and cost.
The peak inverse voltage (PIV) rating for diodes in a bridge rectifier is Vm, which is half that of a center-tap rectifier (2Vm).
It provides higher rectification efficiency (81.2%) compared to half-wave rectification (40.6%).
No center-tapped transformer required
Higher rectification efficiency
Lower PIV rating requirement per diode
Requires four diodes instead of two
Higher voltage drop across the load due to two diodes conducting in series
DC power supply units
Battery chargers
Communication equipment power stages
| Feature | Half-Wave | Full-Wave |
|---|---|---|
Efficiency | 40.6% | 81.2% |
PIV Rating | Vm | 2Vm |
Option B (Centre-tap) is less preferred in modern electronics due to the size and cost of the center-tapped transformer.
The ripple factor of 0.48 is significantly better than the 1.21 seen in half-wave rectifiers.
C is correct — The Bridge full-wave rectifier is the most widely used due to its efficient utilization of the transformer and lower PIV requirements.
Always remember that while the bridge rectifier uses more diodes, the lack of a special transformer makes it the industry standard for cost-effective AC-to-DC conversion.