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Registered Member #1143
Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721
Hi everybody
I decided to make DRSSTC because sstc blows mosfets, and i dont want spend money for that.Is it posible to make drsstc, and don't have problems? if yes, what kind of scheme use ?
the probability of you having no problems is slim to none but a designe that has been used successfully over and over is Steav Ward's DRSSTC 3
also you will have to spend money to make the initial investment, costing you about $200-$500 to build a reliable and good looking one. If you can go with junkyard parts then reliability falls and you will be spending more in the long run but you could build it for less than $200.
Registered Member #146
Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
If you cant get a SSTC to work reliably, then you need to go and figure out what the problem is. Just moving on to a more advanced project isnt likely to work any better.
Registered Member #1143
Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721
Steve Ward wrote ...
If you cant get a SSTC to work reliably, then you need to go and figure out what the problem is. Just moving on to a more advanced project isnt likely to work any better.
sometimes my sstc runs wrey good, with no heating, but sometimes sstc blow mosfets, and i don't know whay, maybe overcurrnet but mosfets "can" runs on 44A
Registered Member #1127
Joined: Mon Nov 19 2007, 12:08AM
Location:
Posts: 139
I've never tried building a DRSSTC before...and it does look very cool. Hey, I wonder how one would increase the current draw from the mains and larger sparks --- is it simply getting a larger IGBT / primary capacitor??
Registered Member #1143
Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721
sory, i don't blow mosfets, whey just break, and make short circuit,(3 times they blows ) But whay they go off ? driving is very good, have GS protection (13V zeners), have overvoltage protection , and good heatsin...they are "eating" 3-4A, and 800W (220V AC) here is my sstc GDT connected direct to transistors, without 12 om rezistor, and with 20nF load, usually my mosfets is 2*4nF :)
Registered Member #95
Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
Linas wrote ...
sometimes my sstc runs wrey good, with no heating, but sometimes sstc blow mosfets, and i don't know whay, maybe overcurrnet
It's a matter of keeping in resonance, your fixed frequency oscillator can't keep in tune when you detune the coil (which happens all the time.) so the mosfets have to switch reactive current and die. Switch to a resonant driver.
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DRSSTC problems
but mosfets "can" runs on 44A 
)
