🔄 1. Half-Wave Rectification
⚙️ Working Principle
A half-wave rectifier uses a single diode to pass only one half of the AC cycle.
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During positive half-cycle → diode conducts → output appears
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During negative half-cycle → diode blocks → no output
👉 Result: Only half of the waveform is used.
📈 Output Waveform
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Pulsating DC
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Gaps during negative cycles
Input AC: ~~~~~~~~
Output DC: _/¯¯\___/¯¯\___
✅ Characteristics
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Simple and low cost
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Uses only one diode
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Low efficiency (~40.6%)
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High ripple (very unsteady DC)
📌 Applications
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Low-power devices
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Signal detection (like radio circuits)
🔄 2. Full-Wave Rectification
⚙️ Working Principle
A full-wave rectifier converts both halves of AC into DC.
There are two types:
(a) Center-Tapped Full-Wave Rectifier
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Uses 2 diodes + center-tapped transformer
(b) Bridge Rectifier (most common)
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Uses 4 diodes in a bridge configuration
📈 Output Waveform
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Both halves become positive
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More continuous DC
Input AC: ~~~~~~~~
Output DC: _/¯\_/¯\_/¯\_
✅ Characteristics
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Higher efficiency (~81.2%)
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Lower ripple than half-wave
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Better DC output quality
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More components required
📌 Applications
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Power supplies
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Battery charging
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Electronics circuits
⚖️ Key Differences
| Feature | Half-Wave Rectifier | Full-Wave Rectifier |
|---|---|---|
| Diodes used | 1 | 2 or 4 |
| Efficiency | Low (~40%) | High (~81%) |
| Output quality | Poor | Better |
| Ripple | High | Lower |
| Cost | Low | Higher |
💡 Important Note
Both outputs are not pure DC—they contain ripples.
To smooth them, we use filters (capacitors, inductors).
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