Re: High Power Dimmer, SS Relay ?inverter?

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

Original poster: "Rick W by way of Terry Fritz <twftesla-at-qwest-dot-net>" <rickwilliams404-at-earthlink-dot-net>

Hey all,
I'm really interested in this project.

Dave Sharpe wrote:
"I have schematic, will sketch up circuit in Excel and shoot to Terry to
post on web site."

Anyone know if the schematic has been posted? I may have missed it if it
had.

Thanks,

Rick Williams
Salt Lake City



----- Original Message -----
From: Tesla list <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Sunday, July 08, 2001 7:00 PM
Subject: Re: High Power Dimmer, SS Relay ?inverter?


> Original poster: "Malcolm Watts by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <m.j.watts-at-massey.ac.nz>
>
> Hi Jason,
>
> On 7 Jul 01, at 10:01, Tesla list wrote:
>
> > Original poster: "Jason Petrou by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <jasonp-at-btinternet-dot-com>
> >
> > Neilster,
> >
> > I am planning an inverter system that will run up to 500W - I was going
to
> > have the fets chopping the DC thru the transformer at 50Hz, but since
its
> > just a simple 555 timing circuit with a varable resistor controlling the
> > resonance, then I can run it anywhere between about 1Hz and 1800Hz (the
> > saturating frequency of the xfmr core).
>
> You will certainly learn everything there is to know about core
> saturation if you run the transformer at 1Hz.
>
>  If I use a line filter after it, and
> > a protection network (thx terry ;) after the NST then I could probably
use
> > the inverter for TC use. With a scope I could get the frequency exact...
It
> > would be interesting to see the effects of high frequency input  for TC
> > use!!!
>
> Are you talking about CW drive?
>
> > On the subject does anyone have a design for a High Powered H-Bridge
circuit
> > (about 50A) because I would prefer to use 'proper' AC rrather than
square
> > DC....
> >
> > Thanks,
> > Jason
> >
> > Geek # 1139 Rank G-1
> > www.thegeekgroup-dot-org
>
> I think some basic electricity should really come first ;)  You won't
> get "proper" AC from an H-bridge. It is a synthesized AC formed by
> PWM'ing the bridge, the modulating frequency being the desired output
> frequency. By that I mean that there will be some high frequency
> switching components in the output. Of course you could go linear but
> then your efficiency would drop in inverse proportion to the amount
> of heatsinking necessary to keep you power devices alive.
>
> Malcolm
>
>
>