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4hv.org :: Forums :: Tesla Coils
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DRSSTC Tank Cap Help

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currentkills91
Wed Oct 12 2011, 04:56AM Print
currentkills91 Registered Member #3831 Joined: Thu Apr 14 2011, 02:54PM
Location:
Posts: 265
Okay, so I'm looking through Digi-Key for suitable caps for my mini DRSSTC and I found a couple of caps that fit my specs

Think something like this would work for a small MMC? (the overall capacitance is only gonna be 4-12nF or so, so I'm guessing that means the overall primary current will be rather low?)

Suspect Cap(:

Its an "AC and Pulse" cap, there is also a "High Frequency and High Stability" option...would either one work?
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Mads Barnkob
Wed Oct 12 2011, 04:22PM
Mads Barnkob Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
mini DRSSTC does sound rather high frequency, some more information, if not all on your coil would help a lot in giving you the right help.

Looking at the datasheet you provided, I would consider the higher voltage rated capacitors, as their dv/dt rating is best.

Keep in mind that these capacitors AC rating is a bit more conservative than f.ex. CDE 942C are.

The AC voltage rating for the linked capacitors drops linear above 100 kHz!

Current ratings are not given in the datasheet.

All this said, I have seen coils in the past using MMCs from Wima and Epcos MKP capacitors with success.
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currentkills91
Wed Oct 12 2011, 11:26PM
currentkills91 Registered Member #3831 Joined: Thu Apr 14 2011, 02:54PM
Location:
Posts: 265
My coil has a res. frequency of about 1.3-1.5 MHz. It will be driven by Steve Wards DRSSTC .5 driver with a half bridge and the supply voltage will be 340 volts from a voltage doubler. The secondary is 22mm in dia. And the primary is 33mm in dia. And the primary inductance is about 2.5-2.8uH. Is that enough info? The caps only need to last several hours of operation, as I'd have no problem replacing them if they lasted that long.
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MRacerxdl
Thu Oct 13 2011, 12:31PM
MRacerxdl Registered Member #989 Joined: Sat Sept 08 2007, 02:15AM
Location: São Paulo, Brazil
Posts: 476
1.3-1.5MHz? lol

I think the IGBTS will not gonna survive (also the driver) for hours running at this frequency. There is not much Warp Speed IGBTS that can handle hundreds of amps at this frequency.

You can try, I never tried to do a DRSSTC at this freq, but I think the ressoant frequency should be much lower.

What IGBT's are you planning to use?
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currentkills91
Thu Oct 13 2011, 07:11PM
currentkills91 Registered Member #3831 Joined: Thu Apr 14 2011, 02:54PM
Location:
Posts: 265
The IGBT's are gonna be these - STGP30NC60W - They are 600V 60A IGBT's with rise and fall times totaling 278ns

I actually meant several hours of operation spread out over smaller periods of time, say 10 minute runs here and there. (sorry if there was any confusion)

I'm also not entirely sure of the actual operating frequency, but the calculators put it in that area. I am allowed access to an oscilloscope at the local collage, so when I have time I'll run over there and do some tests.

So is there any chance those caps would work for my coil? If so which ones, the "AC and Pulse" or the "High Frequency and High Stability" ones?

I've also uploaded pics of the coil's progress to my Flickr account, so maybe click the link and check it out? :D
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