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The Rectifier
Rectification is the conversion of an alternating current to a
pulsating direct current.
• Rectification occurs in both a half-wave and a full-wave
rectifier
A diode passes current in only one direction, therefore it is
ideally suited for converting alternating current (AC) to direct
current (DC).
• When AC voltage is applied to a diode, the diode conducts
ONLY ON THE POSITIVE ALTERNATION OF VOLTAGE (this
is when the anode of the diode is positive with respect to the
cathode)
• This simplest type of rectifier is the half-wave rectifier.
The waveform consists of two pulses of current (or voltage) for
each cycle of input voltage.
• The ripple frequency at the output of the full-wave rectifier is
therefore twice the line frequency.
• Because of the higher ripple frequency, the output is closely
approximate to a DC waveform.
• This makes filtering much easier than it is for the output of the
half-wave rectifier.