SSAC PWM Transformer (SS Variac Update)

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

All

I've not been working on the IGBT SS Variac yet, but is in sight.
While
looking at electronics URL's at work today, I found these two papers.
One covers single phase PWM SS Transformer (read SS Variac with
duty cycle control), and one paper covers three phase voltage control.

VERY interesting and germane for those power electronics EE's out
there willing to take on the challenge.

  http://www.iee.uz.zgora.pl/English/publications/5%5B5%5DPESC02.pdf

Discusses single phase SS PWM AC transformers, and was disclosed at
the PESC 2002 (Power Electronics Specialists Conference) sponsored by
IEEE et al.  Deriving equations, possible circuit topologies etc. are
discussed.
Single quadrant (powering) and dual quadrant (bi-directional)
topologies are
discussed.  The single quadrant straight buck converter looks to me to
be the
most interesting, due to use of standard totem pole power devices with
copack
diodes, IGBT clocking frequencies were fixed arbitrarily at 5kHz, and
simple
low pass filtering for utility wave reconstitution to transformer
load.

  http://www.iee.uz.zgora.pl/English/publications/5%5B6%5Dspedam02.pdf

Covers three phase solid state AC PWM duty cycle voltage control for
the
real high power interests out there.  VERY interesting reading, and
maybe
another electromechanical bastion is about to fall...

Regards
Dave Sharpe, TCBOR
Chesterfield, VA. USA