Re: capacitors in series
- From: ehsjr <ehsjr@xxxxxxxxxxxxxxxx>
- Date: Mon, 03 Jul 2006 05:14:49 GMT
Ken O wrote:
"Ken O" <lera@xxxxxxxxx> wrote in message news:e89gup$jdu$1@xxxxxxxxxxxxxxxx
HI,
I have two capacitors in series. I want to put 35 volt acrosse ( cause I dont have 50v rated) so I want to use 25 v rated. I know its going to make 50v (and 1/ 1/c1 +1/c2) but they are rated 25v, do I need 50v rating capacitors or my two 25v will be fine ? I think it should be ok to use two rated 25v but I wanted to make sure. There are a lot of parallel and series formula on google, but they dont talk much about the ratings.
I did the circuit like said, I get 35 volt at the bridge, but when I add the capacitors, I get 50v (49.8v), I was sure I would be getting 35 volts across both...
ken
Have you considered the ripple voltage? Assuming you
are using 60 Hz AC, it will be about I*.0083/C where
I is the current you draw from the supply in amperes,
and C is the value of your filter capacitor, in farads.
For example, assume you draw 1/2 amp from your ~50
volt supply, and have a 2200 uF 63 volt cap. Your
ripple voltage will be .5*.0083/.0022 or about 1.89
volts. And rather than using the nominal 2200 uF
figure, you should look at the the +/- spec on the
cap and use - spec to compute the lowest value the
cap might be.
There's a whole lot more to consider than the above
when designng a power supply. This site may help:
http://www.electronics-tutorials.com/basics/power-supply.htm
Ed
.
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