Re: [CAD_CAM_EDM_DRO] Cap voltage rating (was Re: Power supply question.....

should be 1.414 * voltage roughly

the other thing to remember about computer ps's is that they run at much higher freq than a std 60hz brute force linear

dave_ace_me wrote:

> Hi Scott and all,
>
> I've been reading the threads about power supplies and caps and
> transformers and all with great interest.
>
> Seems to me that the preference is Torridoidal transformers and huge
> capacity cap's, but the cap's voltage is not suposed to be lots more
> than the expected voltage of the system. is: if you plan on a 35 volt
> power supply, 24 VAC trans + cap, a 50Volt cap would be good, but a
> 100 Volt cap would actually not be a good choice.
>
> On my 12 supply from my computer, it has 500 volt cap's. it is a
> dual power, 220/110.
>
> Then there is the voltage increase from the steppers when not being
> driven, but still spinning.
>
> Is there a good rule of thumb (or actual engineering principals ?)
> to size a capacitor ?
>
> Dave
>
> --- In CAD_CAM_EDM_DRO@y..., scott wilson <swilson@d...> wrote:
> > have seen several pwr supply questions about caps....and it seems
> to me that if they are being used as brute filter caps people are
> using way to low a working voltage....in this case i would feel much
> better with a 80-100v rating....and yes you can put them in parallel
> >
> > RC wrote:
> >
> > > Building my first power supply, needs to be approx. 42 volts @ 10
> amps.... I will need a cap with a 19,000 mf value with at least 50
> v. rating, the question I have is, can one "add" the mf values,
> instead of using one large cap? And if so, how would they be
> connected, series or parallel?
> > >
> > > Thanks,
> > > RC
> > >
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