Re: OLTC update

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Phil-at-TCBFW by way of Terry Fritz <twftesla-at-qwest-dot-net>" <tcbfw-at-charter-dot-net>

Terry,

Hat's off to you for the idea on current sharing . . .

I've used this idea before in a non-TC application (my load to each IGBT was
inductive not capacitive) and it worked great until trying to get the IGBT's
to switch in the nano second range. You should be able to compensate for
this by sending the trigger pulse to each IGBT through a PFN, do a bit of
low power adjusting and I think you'll have "TC The Next Generation"

Waiting with anticipation to see your results !!!

Phil
TCBFW


----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Cc: "David Sharpe" <sccr4us-at-erols-dot-com>
Sent: Saturday, August 10, 2002 10:43 PM
Subject: OLTC update


> Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>
>
> Hi All,
>
> To update the IGBT current sharing in the OLTC...
>
> http://hot-streamer-dot-com/temp/OLTC8-10-02.gif
>
> Yep!  We have ten independent primary caps too.  If we hook them up like
> this, the cap's impedance naturally hard balances the current to the
IGBTs.
>  It is just a done deal, "painfully" simple... nothing can go wrong.  It's
> gotta work.  Even if just one IGBT turns on I "think" it self protects...
> If one stays out, it self protects...  (the frequency is wrong, but who
> cares...)
>
> This solution to current sharing of the OLTC's IGBTs is so beautiful, it
> makes me wanna cry...
>
> Cheers,
>
> Terry
>
>
>