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Transcript
Rectification AC to DC • Electricity distribution – Power stations – Transformers – Transmission lines • AC • Electronics • DC – Smooth – Stable Process of rectification • • • • Conversion of AC to DC Half-wave Full-wave Dedicated circuits – Contain diodes • Semiconductor • Thermionic – Power rating • Supply current to circuits Half-wave rectification • Only the positive halfcycle of the AC supply is allowed to pass Half-wave rectifier circuit • Simple! • Single diode • ‘Load’ – DC circuit…not really getting DC! Vac Load Full-wave rectification Positive AND negative half-cycles converted to ALL positive Full-wave rectifier circuit • Bridge circuit • Load – Circuit requiring DC Vac Load Bridge as two potential dividers Vac Vout Capacitative smoothing Vac Vout Smoothed output • Un-smoothed – Large ripple voltage – Not true DC • Low-value smoothing capacitor – RloadC small • High-value smoothing capacitor – RloadC big www.search for... • • • • • Capacitors Rectification PSU Electronic power supplies Bridge rectifiers
