Re: SSTC bridge driver SNUBBER circuits

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

Original poster: "gtyler" <gtyler-at-drummond-dot-org.za> 

On the surface that is true, but it is an indication that you don't have
tight control over what the gates are doing and that is undesirable.

George

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Sunday, February 01, 2004 6:17 AM
Subject: Re: SSTC bridge driver SNUBBER circuits


 > 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
 >
 >
 >