Filter Capacitor Help plsss

Discussion in 'Homework Help' started by purecilia, May 27, 2009.

  1. purecilia

    Thread Starter Member

    Dec 29, 2008
    12
    0
    Hi

    Can someone please help me go through these 2 questions..

    1.Explain why the value of the filter capacitor is chosen to be a large value in a Full wave rectifier

    2.Why is the bridge rectifier circuit preferred to the full wave rectifier
     
  2. R!f@@

    AAC Fanatic!

    Apr 2, 2009
    8,754
    760
    1. Capacitor value does not necessarily depend on the type of rectify used but rather to the load and the frequency of the ripple or the AC used to rectify
    2. A full wave bridge converts both the +ve and -ve half cycle of the AC Voltage to a usable DC value. That is why it is referred as a full wave, on ther other hand a half wave discards one half of the AC cycle.
    Got it.
     
  3. StayatHomeElectronics

    Well-Known Member

    Sep 25, 2008
    864
    40
    There is a good overview on wikipedia of the bridge rectifier and the reservoir capacitor.

    A bridge rectifier is a full wave rectifier. A full wave rectifier can also be built to use a center tap transformer which is not required in the bridge rectifier.

    http://en.wikipedia.org/wiki/Diode_bridge
     
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