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Re: [TCML] Where is everyone?

Thanks Greg,

Sorry, you just make me want to know more! Are you saying this is not a DRSSTC design but more akin to a “normal” SSTC?

What IGBTs are you using and how are you driving them? Do you have any protection circuitry and what kind of duty cycle? What is the primary voltage and how many turns on that secondary?

I hope one day you write a detailed paper on this thing. 

I very much hope I can visit the US one day and come see it in operation, or better yet the full-size towers themselves.

Regards,

Greg







Sent from Mail for Windows 10

From: Greg Leyh
Sent: Thursday, 22 November 2018 8:20 AM
To: tesla@xxxxxxxxxx
Subject: Re: [TCML] Where is everyone?

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>
> Content-Type: text/plain; charset="UTF-8"
>
> 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.
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