Re: SSTC bridge driver SNUBBER circuits

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

Original poster: dhmccauley-at-spacecatlighting-dot-com 

With all this talk about ringing on the gate . . . The first thing you need
to understand is, that if the ringing occurs well above the turn-on point of
the gate and is under
the maximum voltage rating of the gate, there is nothing else you need to
do.  Its only when the ringing has a large enough amplitude that it swings
into a region that
either bring the MOSFET out of saturation, or exceed the maximum ratings of
the gate, that a snubber circuit is necessary.

Dan

 > I've got the answer to the ringing problem.  SNUBBER circuit!  I use a 51
 > ohm 1/4 watt resistor in series with a 1 nF capacitor. I put this combo
 > across the gate transformer outputs and it gives a good response.   On my
 > plasmasonic board I'm running at 240 khz and the ringing was about 13Mhz.
 >
 > I hope this helps,
 >
 > Shaun Epp