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Chapter 1 of 12 • Page 1 of 248🔒 Protected PDF • Watermarked
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There is a need of transformer for _____.
Half-wave rectifier
Centre-tap full-wave rectifier
Bridge full-wave rectifier
None of the above
Centre-tap full-wave rectifier
Quick Summary: A centre-tap full-wave rectifier requires a centre-tapped transformer to provide two equal and opposite voltages (relative to the centre tap) to the two diodes. This configuration allows each diode to conduct during alternate half-cycles of the AC input, effectively rectifying both parts of the waveform.
A centre-tap full-wave rectifier requires a centre-tapped transformer to provide two equal and opposite voltages (relative to the centre tap) to the two diodes. This configuration allows each diode to conduct during alternate half-cycles of the AC input, effectively rectifying both parts of the waveform.
Vdc=π2Vm — Average DC output voltage for full-wave rectification
PIV=2Vm — Peak Inverse Voltage for centre-tap configuration
During the positive half-cycle, the top half of the secondary winding makes the top diode forward-biased, while the bottom half makes the bottom diode reverse-biased. During the negative half-cycle, the polarity reverses, causing the bottom diode to conduct and the top to be reverse-biased. The centre tap acts as the common return path for the load current, ensuring current flows in the same direction through the load during both halves.
Requires a centre-tapped secondary winding.
Utilizes two diodes instead of four.
Provides a common ground reference at the centre tap.
The transformer is essential for providing the phase-split secondary voltage.
Simpler construction compared to bridge rectifier.
Higher efficiency than half-wave rectifier.
Transformer size is larger and costlier due to centre tap.
PIV rating required for diodes is double that of bridge rectifier.
Low voltage power supplies.
Battery charging circuits.
Option A (Half-wave) uses only one diode and doesn't strictly require a centre-tap transformer.
Option C (Bridge) uses four diodes and works with a standard (non-tapped) transformer.
The centre-tap transformer is the defining feature of the configuration mentioned in option B.
B is correct — A centre-tap full-wave rectifier specifically necessitates a centre-tapped transformer to generate two symmetric voltage phases relative to the center terminal.
Remember that the PIV rating is the main drawback for the Centre-Tap configuration; always double the peak secondary voltage when selecting diodes.