Re: mmc calculator

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Barton B. Anderson by way of Terry Fritz <twftesla-at-uswest-dot-net>" <tesla123-at-pacbell-dot-net>

Hi Bob,

The single cap int. resistance is in series with caps and is added to it as
part of the power
dissipation formula. Reliability is is derived from a value of power
dissipation per cap *
thermal dissipation factor (Cdeg./Watts). A value of 5 and below would
suggest "very good". A
value over 15 would suggest a poor design. Obviously, the other fall
inbetween. I would suggest
as Terry did. Take a look through his paper he linked you to. It will
explain most of the tid
bits. Go through the example then apply it to your design.

Take care,
Bart A.

Tesla list wrote:

> Original poster: "bob golding by way of Terry Fritz
<twftesla-at-uswest-dot-net>" <yubba-at-clara-dot-net>
>
> Hi All,
>     After my mishap with my cap on Sunday I have decided to build a
> bigger one.:-)) I have a few questions. When using  Barts java
> calculator I am a bit puzzled about the" primary circuit resistance"
> box. Do you use the single cap internal resistance calculation and
> multiply it by the number of caps?. It looks to me as if there is a
> trade off between  the voltage rating and the ESR. I have 340 of the ERO
> caps that Mike got. 0.068uF 1500 volts. I know someone did find the spec
> for these but I can't find it at the moment. I was going to go for  18
> strings 0f 18 caps. If I use the single cap resistance calc this comes
> out at 6.9 ohms. Which the program says is very good. Have I got this
> right? I would like to use the same cap when I change to a DC supply. Is
> the voltage calc the same.?
>
> cheers
> bob golding