[Prev][Next][Index][Thread]
Re: MMC Calculator Program
Tesla List wrote:
>
> Original Poster: Terry Fritz <twftesla-at-uswest-dot-net>
>
> Hi All,
>
> I wrote up a little program that will do all those nasty MMC
calculations.
Thanks! It is a nice program, and I can verify its operation, to some
degree:
With my silly little coil, 4 strings with 2each caps is listed as too
hot! : they lasted about 10 minutes, of course just 2 caps also are
listed too hot, they last less than one minute.
I have not tried 6 strings with 3 caps in each, they would be high risk,
but 4 in series, and 8 strings is listed as safe, and they stay
completely cold.
I`m using Phillips 376 mmkp 56nF/1600VDC
MMC Calculator Ver. 1.1 2/15/2000 Terry Fritz
Firing voltage = 5000
Fo = 300000
Break rate = 300
Cap value = 5.6E-08
Strings Caps/String Total Value Temperature Cost
2 1 112.00 107.13 12.00 Too Hot!
4 2 112.00 26.78 48.00 Too Hot!
6 3 112.00 11.90 108.00 Some Risk
8 4 112.00 6.70 192.00 Safe
10 5 112.00 4.29 300.00 Very Safe
> It is sort of geared to my Panasonic caps but if you change the heat
> dissipation constant in line 1260, it should basically work for any. It is
> based of the calculations at:
It would be nice, if the program could also ask the lead spacing, and
then itself substitute the corresponding dissipation.
> Most things are worst case but the numbers seem to work fine. Hopefully
> this will make MMC design much easier especially for the critical
> temperature rise aspect.
It has, however I am, after runnung the numbers, still glad that I made
my 34nf cap for the museum coil, as rugged as I did: (This is with the
dissipation changed to 67, for the 22nF caps I used then)
MMC Calculator Ver. 1.1 2/15/2000 Terry Fritz
Firing voltage = 25000
Fo = 100000
Break rate = 300
Cap value = 2.2E-08
Strings Caps/String Total Value Temperature Cost
3 2 33.00 %1099.85 36.00 Too Hot!
6 4 33.00 274.96 144.00 Too Hot!
8 5 35.20 175.98 240.00 Too Hot!
9 6 33.00 122.21 324.00 Too Hot!
11 7 34.57 89.78 462.00 Too Hot!
12 8 33.00 68.74 576.00 Too Hot!
14 9 34.22 54.31 756.00 Too Hot!
15 10 33.00 43.99 900.00 Too Hot!
16 10 35.20 43.99 960.00 Too Hot!
17 11 34.00 36.36 1122.00 Too Hot!
18 12 33.00 30.55 1296.00 Too Hot!
19 12 34.83 30.55 1368.00 Too Hot!
20 13 33.85 26.03 1560.00 Too Hot!
21 13 35.54 26.03 1638.00 Too Hot!
21 14 33.00 22.45 1764.00 Too Hot!
22 14 34.57 22.45 1848.00 Too Hot!
23 15 33.73 19.55 2070.00 High Risk
24 15 35.20 19.55 2160.00 High Risk
24 16 33.00 17.19 2304.00 High Risk
25 16 34.38 17.19 2400.00 High Risk
25 17 32.35 15.22 2550.00 High Risk
26 17 33.65 15.22 2652.00 High Risk
27 17 34.94 15.22 2754.00 High Risk
27 18 33.00 13.58 2916.00 Some Risk
28 18 34.22 13.58 3024.00 Some Risk
28 19 32.42 12.19 3192.00 Some Risk
29 18 35.44 13.58 3132.00 Some Risk
29 19 33.58 12.19 3306.00 Some Risk
30 19 34.74 12.19 3420.00 Some Risk
30 20 33.00 11.00 3600.00 Some Risk
>
> Comment suggestions welcome. I am no computer programmer but the basics of
> how the program works should be easy to see.
>
> Cheers,
>
> Terry
>
Thanks for another very usefull tool!
Cheers, Finn Hammer