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CBSE Class 12-science Answered

Why a half way rectifier cannot be used with a capacitor filter to get a full way rectifier?
Asked by mohitgehlot | 25 Feb, 2011, 06:37: PM
Expert Answer
Dear student,
 

When rectification is used to provide a direct voltage power supply from an alternating source, the amount of ripple can be further reduced by using larger value capacitors but there are limits both on cost and size. For a given capacitor value, a greater load current (smaller load resistor) will discharge the capacitor more quickly  and so increases the ripple obtained. Then for single phase, half-wave rectifier circuits it is not very practical to try and reduce the ripple voltage by capacitor smoothing alone, it is more practical to use "Full-wave Rectification" instead.

In practice, the half-wave rectifier is used most often in low-power applications because of their major disadvantages being. The output amplitude is less than the input amplitude, there is no output during the negative half cycle so half the power is wasted and the output is pulsed DC resulting in excessive ripple.

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Answered by | 25 Feb, 2011, 01:08: PM
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