Rectification

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• Rectification

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AC to DC

• Electricity distribution
• Power stations
• Transformers
• Transmission lines
• AC
• Electronics
• DC
• Smooth
• Stable

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Process of rectification

• Conversion of AC to DC
• Half-wave
• Full-wave
• Dedicated circuits
• Contain diodes
• Semiconductor
• Thermionic
• Power rating
• Supply current to circuits

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Half-wave rectification

• Only the positive half-cycle of the AC supply is
  allowed to pass

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Half-wave rectifier circuit

• Simple!
• Single diode
• Load
• DC circuitnot really getting DC!

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Full-wave rectification

• Positive AND negative half-cycles converted to
  ALL positive

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Full-wave rectifier circuit

• Bridge circuit
• Load
• Circuit requiring DC

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Bridge as two potential dividers
Vout
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Capacitative smoothing
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Smoothed output

• Un-smoothed
• Large ripple voltage
• Not true DC
• Low-value smoothing capacitor
• RloadC small
• High-value smoothing capacitor
• RloadC big

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• Capacitors
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• PSU
• Electronic power supplies
• Bridge rectifiers