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Registered Member #1397
Joined: Mon Mar 17 2008, 12:47PM
Location: Finland
Posts: 43
Hi all! Im new here and I`d like to know that can the HGTP20N60A4 IGBT replace with acceptable transistor?For an example this: 2SD2499, because of I dont know much about IGBT`s? Thanks!
Registered Member #1397
Joined: Mon Mar 17 2008, 12:47PM
Location: Finland
Posts: 43
Oh yes, Uzzors schematic looks cool but what is the "triangle" where is + and -? I think that it is comparator, is this good:LM393?Thanks! PS.Sorry for double posting!
Registered Member #158
Joined: Sun Feb 12 2006, 09:53PM
Location: Central Ohio
Posts: 282
This is possibly a silly question but is it possible to gang multiple boost converters in series? For example lets say your cap bank was two caps, 5000uF 450V each, in series. It seems most boost converters I've seen in my searches max around this. So is it possible if everything else was isolated (batteries, etc.) that the HV output of one can be tied to the ground of the other?
So far I've just been using mains for charging. The way I have it rigged right now that maxes out at around 700V. I'd like to be able to get 1kV, but what I really would like to do is to get some battery powered supplies working for portability. aahz's circuit seems fairly simple and cheap so I was probably going to try to make one like that first. Just not sure if the series gang will work. Another thing I was thinking is by use of a few relays to have the charger hooked up to one half the bank until its charged, then discconect from it and connect to the other half, of course that would take double the charge time.
Registered Member #158
Joined: Sun Feb 12 2006, 09:53PM
Location: Central Ohio
Posts: 282
The cap bank was just made up, my question was about ganging the boost converters, which I am still curious if that is possible. Yeah, I have banks larger than that, but also smaller, and I dont mind a long charge time too at least for a prototype. But the problem is V, since all my coilguns are of the induction type, the cap banks I have are in the 900V - 1000V range, and so far I have never yet charged them fully.
Registered Member #75
Joined: Thu Feb 09 2006, 09:30AM
Location: Montana, USA
Posts: 711
Tristan, both converters are referenced to ground, so you would need two independent (floating) power supplies to accomplish this feat. I think with the step-up ratio you are interested in, it would make a lot more sense to construct a flyback converter. There is a thread about one I made in the high voltage forum here The only difference to the boost converter really is that you have two separate windings on the inductor, so you get an additional voltage step up from the turns ratio. Simple and effective.
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12v to 450v+ Boost Converter
