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Forums
4hv.org :: Forums :: Tesla Coils
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Pondering about with Solid state spark gaps

1 2 
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Seoul_lasers
Sat Aug 16 2008, 01:12PM Print
Seoul_lasers Registered Member #1630 Joined: Sat Aug 09 2008, 11:36AM
Location: Seoul Korea
Posts: 115
 		A while ago I came across a website about someone experimenting with IGBTs to replace spark gaps in large coils traditional coils.
I seemed to have lost the page.

I imagine the stress of peak currents and voltage would be murder on IGBTs...

Could someone fill me in if they know anything about this experiment?
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Mads Barnkob
Sat Aug 16 2008, 01:20PM
Mads Barnkob Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
 		You are looking for OLTC offline tesla coils

edit: dont listen to me :) its SISG
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Dr. Dark Current
Sat Aug 16 2008, 01:47PM
Dr. Dark Current Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
MadsKaizer wrote ...

You are looking for OLTC offline tesla coils
I think he is looking for SISG (solid state spark gap)
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Dylan
Sat Aug 16 2008, 02:18PM
Dylan Registered Member #1024 Joined: Sun Sept 23 2007, 10:56AM
Location: Northern NSW, Australia
Posts: 95
 		I think you will find the info you are after here (slow pdf download on page) :
Link2
and a brief intro:
Link2
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HV Enthusiast
Sat Aug 16 2008, 02:19PM
HV Enthusiast Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
 		Yes, the design is 100% successful. Just do a search for "piranha" or "terry fritz" on this forum and you should find information on what you seek.

Link2 may have information as well if Terry actually posted it publicly.

[EDIT - looks like Dylan beat me to it! :) ]
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Seoul_lasers
Sat Aug 16 2008, 03:17PM
Seoul_lasers Registered Member #1630 Joined: Sat Aug 09 2008, 11:36AM
Location: Seoul Korea
Posts: 115
 		Thanks I saw the link... but I got questions.
Currently I have a coil running 240mA 12Kvac... the high voltage needs to be DC to run the SDAC IGBTs right? Currently there is now way of using AC on the set up.
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HV Enthusiast
Sat Aug 16 2008, 05:13PM
HV Enthusiast Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Seoul_lasers wrote ...

Thanks I saw the link... but I got questions.
Currently I have a coil running 240mA 12Kvac... the high voltage needs to be DC to run the SDAC IGBTs right? Currently there is now way of using AC on the set up.

No. IGBTs are unipolar devices.
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Ken M.
Sat Aug 16 2008, 07:07PM
Ken M. Registered Member #618 Joined: Sat Mar 31 2007, 04:15AM
Location: Us-Great Lakes
Posts: 628
 		Besides getting AC-DC is relatively easy, even with voltages btwen 1-20K I think, just use a bunch of diodes in a bridge formation and presto you have dc.
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Seoul_lasers
Sun Aug 17 2008, 01:40AM
Seoul_lasers Registered Member #1630 Joined: Sat Aug 09 2008, 11:36AM
Location: Seoul Korea
Posts: 115
 		right, I got that, but when you do this your voltage is higher.
An AC version of SISC has not been discussed yet on any page. If it has let me know. All of them are running DC or so it seems. Anyone here run one for an AC coil?
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Steve Conner
Sun Aug 17 2008, 10:47AM
Steve Conner Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
 		No. An AC SISG would need one stack of IGBTs for each direction. That's twice as many expensive IGBTs for the same output power. So it's more cost-effective to rectify the high voltage supply.
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