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Registered Member #687
Joined: Mon May 07 2007, 02:21AM
Location:
Posts: 14
Hello all,
In the process of building a small MMC for my DC resonant coil. The capacitors I have selected are 0.5uF 1000VDC metalized Polypropylene. capacitors
I plan on using 20 in series, giving 20,000VDC and 0.025uF. I am running the tank of the coil at 8,000VDC (single MOT, voltage doubled, then that inductive kick effect = 8,000VDC at the primary).
My question is, there seems to be some conflicting opinions on which ratings (AC or DC) should be used / considered when designing an MMC. Which rating should be used? Isn't the AC rating on caps for 60Hz and is much different at RF? Is 20,000VDC going to be enough for TC duty? If I send these to MMC heaven, I will just try something different.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
Regarding the original question, if you go here and click on "General Information" you will get a pdf file, Go to page 5 and look at the third waveform - just like a TC.
When I did the math it turned out that for 100 sparks per second in a typical SGTC the dc rating can be used. (With Arcotronics A72series capacitors) You can use the document to estimate your capacitor performance.
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