basic electonics and electical, Summaries of Electrical and Electronics Engineering

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Rectifiers

Half wave Rectifier Full wave Rectifier Bridge Rectifier

introduction

 A rectifier is an electrical device that

converts alternating current (AC), which

periodically reverses direction, to direct

current (DC), which is in only one direction, a

process known as rectification.

Half wave rectifier

 In half wave rectification, either the positive or

negative half of the AC wave is passed, while the other half is blocked.

 Because only one half of the input waveform reaches

the output, it is very inefficient if used for power transfer.

Half wave rectification

Output dc voltage calculation

 The output DC voltage of a half wave rectifier can be calculated with the following two ideal equations

Full wave rectification

 For single-phase AC, if the transformer is

center-tapped, then two diodes back-to- back (i.e. anodes-to-anode or cathode-to- cathode) can form a full-wave rectifier.

Full wave rectifier using transformer and 2 diodes

formula

 The average and root-mean-square output voltages

of an ideal single phase full wave rectifier can be

calculated as: