Re: High Power Dimmer, SS Relay ?inverter?

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

Original poster: "David Sharpe by way of Terry Fritz <twftesla-at-qwest-dot-net>" <sccr4us-at-erols-dot-com>

Rick, All

Once it became clear that the SCR Dimmer wouldn't work, I had Terry
pull it from hot-streamer for two reasons:
1. Why confuse the masses with a circuit that will not meet requirements?
2. I had not personally built the circuit, so it was still a "pipe dream" in my
    eyes, even though the circuit was published in a respected trade magazine.
If there is interest, we can repost.  The new idea I'm working on I think
may be a better long term solution if circuit complexities can be solved, and
simplified to meet needs of average experimenter.

Regards
Dave Sharpe, TCBOR
Chesterfield, VA. USA

Tesla list wrote:

> 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
> >
> >
> >