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Registered Member #1407
Joined: Fri Mar 21 2008, 07:09AM
Location:
Posts: 222
Well yesterday i was bored and decided to make a simple SSTC, composed of a 555, crappy IGBT from a tv and a quai resonant cap across primary.
i was actually pretty good it gave like 1cm arcs from 12volts in put. So now i was wondering if i could rectify mains and filter it for 320 volt and use an irfp450 or a good igbt for the switch
This is my main question should i use a GTD to isolate the oscillator form the 320v.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
If you are using 320 Vdc with a resonant primary capacitor I would expect 600V peak (or more) across the transistor so an IRFP450 with a 500V rating will likely fail.
Registered Member #989
Joined: Sat Sept 08 2007, 02:15AM
Location: São Paulo, Brazil
Posts: 476
yeah, use half-bridge or full-bridge of IRFP450/460 but only run from 127VAC Mains (150VDC-170VDC), or you can blow your mosfets if it wasnt tuned correct.
Registered Member #103
Joined: Thu Feb 09 2006, 08:16PM
Location: Derby, UK
Posts: 845
I say give it a whirl, the igbt or mosfet or whatever is going to blow up anyway, but that's part of the fun
As for GDT, probably a good idea, get winding dude - if nothing else it will block any asymetry in your drive waveform and probably save most of your oscillator when the lights go out.
Registered Member #1407
Joined: Fri Mar 21 2008, 07:09AM
Location:
Posts: 222
Sulaiman wrote ...
If you are using 320 Vdc with a resonant primary capacitor I would expect 600V peak (or more) across the transistor so an IRFP450 with a 500V rating will likely fail.
Ok thanks for advice, so maybe i find a way to get 200vdc, this will have much smaller peaks than 600v or not
Uzzors wrote ...
With high supply voltages such as mains you should use a different topology. Half or full bridges are the most common and sturdy.
ye but i guess a full bridge is a 'little' more complicated than a 555 with a mosfet, the whole point of this is it's simplicity
This in not a serious project people LoL, it was a little experimenting
how ever uzzors i am working on a full-bridge i am currently collecting parts for it and am going to start building in like 3.5 months on my long school holidays
and if you are wondering what schematic im going to follow it is going to be Steve Wards sstc-2
i know that you people build these Full-bridges in like 2 days but i guess i am not as experienced as you
Avalanche wrote ...
I say give it a whirl, the igbt or mosfet or whatever is going to blow up anyway, but that's part of the fun
As for GDT, probably a good idea, get winding dude - if nothing else it will block any asymetry in your drive waveform and probably save most of your oscillator when the lights go out.
Disclaimer - I've had a few ales
thanks alot for help, i knew i had to use a GDT but wasnt 100% sure
i just need to get an irfp450, in a few days ill go to parramatta to buy some as they are not availible at my local electronics store, first i'll try on 12 then on 24 then 50 then like 160 volts
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GDT Question
