AC capacitors or DC capacitors?

Thread Starter

onlyvinod56

Joined Oct 14, 2008
369
Hello,

I am trying to build a multilevel inverter like this.


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"
 

DickCappels

Joined Aug 21, 2008
10,153
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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