David
This makes sense, your insulating substrate
on most SI die is aluminum oxide and is
"generally" UL listed at 3kV or less to heatsink
if HS is grounded. Can guarantee local RF fields
especially in a SG system are higher then that, hence
smoked rectifiers. Glad you found root cause of problem...
On Monday, March 17, 2014, David Rieben <drieben@xxxxxxx> wrote:
> Hi all,
>
> For those of you who remember my "help please" thread, about my Green
> Monster Tesla coil suddenly seeming to have developed an appetite for the
> FWB rectifier for the ARSG motor, I think I have fixed the problem (keeping
> my fingers crossed). I tried mounting the FWB "brick" on a flat piece of
> cop-
> per for heat sinking WITHOUT grounding the external metal case of the
> brick.
> I also installed an extra corcom line filter upstream of the FWB and in-
> stalled a 20 amp button circuit breaker upstream of the RSG control
> variac, so as to not engulf it in flames in case of another FWB going
> dead short. I wheeled her out tonight and I ran her for a good minute
> or so without a hitch (it was smoking the FWB rectifiers within seconds
> before making the "corrections"). I was still a bit "gun shy" to really let
> her rock tonight but was able to determine that I had obviously cor-
> rected the rectifier eating problem. Thanks for the helpful suggestions to
> all who responded to my "plea".
>
> David Rieben
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--
Dave Sharpe, TCBOR/HEAS
Chesterfield, VA USA
Sharpe's Axiom of Murphy's Law
"Physics trumps opinion!"
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