 SSTC Project
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M3mristor
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Sat Nov 08 2008, 02:48PM
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Registered Member #1738
Joined: Fri Oct 03 2008, 08:48AM
Location:
Posts: 5
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Hello all,
currently I am working on a solid state project. It took some time but now gatedriver and gdt work well.
I use a fullbridge topology running at a fixed frequency.
The next step will be to build a secondary feedback circuit. To avoid problems I will try to use something like a backbone that limits the maximal on time of the igbts.
If it works I will post what I am thinking about in detail.
One thing I need to know:
How much will the resonance frequency drift when the coil starts arcing. And in which direction? Is there a way to minimize this frequency change, perhaps the geometry of topload?
I don’t have the possibility to measure this.
I also wonder if things will work when the bridge´s output is connected to a transformer and then the transformer secondary connected between to lower end of a teslacoil and ground. Has someone ever tried this?
I have some large powerferrits here, but I am a little bit afraid of blowing my work.
Thanks for any comment
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uzzors2k
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Registered Member #95
Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
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Hi,
I've never measured frequency drift of a coil, but I doubt it's much more than +/-10%. Bringing objects close to the topload lower the frequency, as this increases the topload capacitance somewhat.
The isolation/step up transformer method is called "base feeding". Covered here.  It hasn't been used too often, and I can't recall a single "finished" TC which uses that manner of driving.
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