AC capacitors or DC capacitors?

Discussion in 'The Projects Forum' started by onlyvinod56, Jan 12, 2013.

  1. onlyvinod56

    Thread Starter Active Member

    Oct 14, 2008
    362
    1
    Hello,

    I am trying to build a multilevel inverter like this.
    [​IMG]

    What kind of capacitors should be used in that circuit?
    It is shown that they are polarized.
    What will be the voltage rating of the capacitors if the DC input is rectified from 230V ac (not filtered).?

    I have two 1000uF, 200V capacitors.

    note: Actually i got this doubt because in the post#2 of
    http://forum.allaboutcircuits.com/showthread.php?t=28895

    "Capacitive voltage dividers are really only usable for AC circuits.

    Capacitors block DC, and pass the effects of AC"
     
  2. DickCappels

    Moderator

    Aug 21, 2008
    2,653
    632
    Since Vd is DC and in the thousand(s) of uf, they will be electrolytic capacitors.

    The peak voltage will be 325V, so I would not use a capacitor rated at less than 400V.
     
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