Re: Terry`s DRSSTC, gate drive

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Terry Fritz <teslalist@xxxxxxxxxxxxxxxxxxxxxxx>

Hi Steve,

At 08:55 AM 3/10/2005, you wrote:
> Hey Terry,
>
> I didnt notice how you were powering your gate drivers, excellent
> solution there ;-).  The only complaint i have is that now you cant
> use a variac to power the coil... well, you at least need 30V or so on
> the bridge.

Each driver uses 35 volts so 70 volts is best.  I run it of 45V (5 nine 
volt batteries) for testing ok too.

> But you were set on the idea of no variac, so it looks
> like you got what you wanted ;-).

I tested it with the batteries first and from there it runs always off the 
full 340V buss and pulse width controls the power.  Works really well and 
no variac!!

> Im still using them, but thinking
> about making PWM to supply my BIG coil at several kVA.

Aside from initial testing, I don't miss the variac at all.  But you should 
have current limits and all that in the no variac case to provide "limits".


> Anyway, Finn, the program I use is express PCB, you can get it at
> www.expresspcb.com.  Im pretty sure thats what Terry is using too
> since that is where he ordered his PCBs from.  Its a simple and free
> program.

Yes!!  A lot of people are using this nice free program!!

Cheers,

        Terry



> Seeya,
>
> Steve
>
>
> On Thu, 10 Mar 2005 08:16:54 -0700, Tesla list <tesla@xxxxxxxxxx> wrote:
> > Original poster: Finn Hammer <f-h@xxxx>
> >
> > Terry,
> >
> > No, I think I finally get it.
> >
> > You seem to be using the same schematic capture program as Stephen Ward
> ...........................