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Hi Greg,
No real secret there, the primary drive is just a straight-up
non-resonant H-bridge, like the ones used in VF motor drives.
There's no high current series capacitor, or feedback from the
secondary. The secondary freq is measured beforehand, and the primary
drive is manually set to that frequency. It's a simple yet robust
system with high predictability... good to have when there's lots of
silicon at risk.
Since it's a cost-sensitive design, the IGBTs are of course loaded way
beyond their continuous ratings. I've lost two IGBTs so far, both when
I tried raising the current limiters to coax higher drive levels.
As IGBTs get cheaper/better I'll upgrade the primary drive capability.
The coil will throw ground strikes already, but my ultimate goal is to
generate the highest peak voltage possible without breakout at low BPS.
On 11/21/2018 9:10 AM, tesla-request@xxxxxxxxxx wrote:
Message: 6
Date: Wed, 21 Nov 2018 20:53:03 +1000
From: Greg Peters<greg.j.peters@xxxxxxxxx>
To: Tesla Coil Mailing List<Tesla@xxxxxxxxxx>
Subject: Re: [TCML] Where is everyone?
Message-ID:
<CA+bpwPCPR-rv_5BjkoLM_zuoRu3m9U8qSXYct7jb2FT=-JagUQ@xxxxxxxxxxxxxx>
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Hi Greg,
Amazing coil! Is there anywhere we can see some more specs around the IGBT
and driver configuration? Guessing it's a secret but would love to know
more about what's going into that thing.