Okay I did another mains test today just for sh*ts and gigs. I was able to run it on mains for a long time no problem, up to a 10amp fuse on mains and About 30% on dimmer. Fets finally got warm to the touch. Guessing from earlier tests, most likely around 80-90v. I then went up to 40% on dimmer and popped the fuse. So I put a 15amp fuse in, I ran 40-45% on dimmer for about 25 sec till it stopped. No loud noise at all, just stopped. I checked and found two fets fried, One high one low, Same switch. This was with a 74hc14. Found some surface mounts I had.
So If I ran well up to that point to you think its time for an IGBT test? Please let me know any doubts in your mind. It may be over current but I keep coming back to the fact that two are switching at the same time, sharing current. So max 400W a piece, 15amp*100V=1500W/4=375W a piece? So am I 750W of 800W total or am I 375W of 800W total?
I only stray away from making the switch just yet cuz I'm not getting the fets hot yet. If they can run in the 120*c range fine, I don't think I'm past the power threshold yet. So In your opinion, circuit or Fets? I mean this is practically the same circuit as the lonescience guys. So I feel if his circuit worked mine should, and that's what makes me stray back to Fets...UGH LOL
EDIT:
Okay I thought of something else here. This is a different failure then before/ever. earlier I popped two fets, high and low, but oppositely switching. So a high and low that where connected by source(high side) and drain(low side) on output rail. This time I popped a high and low but same switched(opposite output rail). This is cool because it's something different but it's also confusing. How does one low side fet fry(short) without the high side fet(oppositely switching) on the same output rail not fry? If you have a short from ground to output how does the next inline, switching positive to that same output, not short that one through the first fried fet? Causing that one to blow?
So I'm hella lost here. Can someone explain how this is possible? Only thing I could think of is maybe I didnt have one fet working so I was on a three fet bridge. Although if that where the case I should have three fried fets........