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Re: Terry's DRSSTC - The Bridge...



Original poster: Terry Fritz <teslalist@xxxxxxxxxxxxxxxxxxxxxxx>

Hi Steve,

At 11:54 AM 12/11/2004, you wrote:
....

Terry,

My latest DRSSTC (the very tiny one) does not use a variac to control
power.  Basically my controller can vary pulse width down to basicaly
1uS or so, which is only enough for 1 RF cycle at most.  While its not
absolute zero output, it does only make about 1/16" sparks.  Anyway, i
just use a soft start (switch in a resistor on the AC line) to charge
the filter caps, then i switch out the resistor and its ready to play.
 I then control power and BPS from my little box made from an old
coffee can :-)  No variac needed.

Well that was easy!!! :-)))) The soft start resistor can also be used to quickly drain the buss caps too when you want to power down. Having a consistent buss voltage helps the gate drive power supplies and makes the IGBT crossover timing more stable.


Sort of a perfect solution there ;-))

Thanks!!

Terry