The difference between half wave and full wave rectification:
Half-wave rectification:
- Uses a single diode to allow only one-half of the AC waveform (either the positive or negative half-cycle) to pass through. The other half is blocked.
- Results in a pulsating DC output with a significant amount of ripple (variation in voltage). The average DC voltage is lower compared to the input AC voltage.
- Simpler to implement, requiring only one diode, but less efficient because it wastes half of the input power.
- The average output current is 0.318 times the peak input current. The RMS value is 0.5 times the peak input current.
Half-wave rectification is not well adopted because:
- Less Average current
- Less average RMS
- High pulsation output
- Lower voltage developed
- More ripple as compared to others
- Efficiency is less as compared to others.
Full-wave rectification:
- Uses either two diodes in a centre-tapped transformer configuration or four diodes in a bridge rectifier configuration to utilize both halves of the AC waveform.
- Produces a pulsating DC output with less ripple than half-wave rectification, resulting in a smoother DC output and a higher average DC voltage.
- More efficient as it uses both halves of the input AC waveform.
- Requires more components (two or four diodes), but provides a more efficient and improved DC output. The average output current is 0.6365 times the peak input current, and the RMS value is 0.707 times the peak input current.
Sketch of bridge connection for full wave rectification: