题目内容
The rectifier uses the ability of a diode to conduct during one half cycle of AC to convert AC to DC. A single diode rectifier only uses the positive half part of the AC wave to produce a half-wave varying DC.
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A bridge rectifier uses four diodes connected in a bridge network to produce a full-wave varying DC output .
Filtering is performed by a large value electrolytic capacitor connected across the DC supply, supplying current to the output when the varying DC voltage from the rectifier is falling.
The diagram Fig. 3-9 shows the unsmoothed varying DC (dotted line) before filtering and the smoothed DC (solid line) after filtering .
The capacitor charges quickly near the peak of the varying DC, and then discharges as it supplies current to the output, smooths the DC from varying greatly to a small ripple.
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