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Registered Member #3960
Joined: Mon Jun 20 2011, 06:27AM
Location: Wuhan Hubei China
Posts: 33
Hello every one!:-D This is my new work I use two Flyback transformer output 3KW arc
---------------------------------------------
------------- 1:This is my Regulator a digital ammeter and an old-fashioned ammeter 2: transformer 3:Fullbridge board(use four G40N60A4 s) 4:and a system schematic ----------------------------------------
------------------- Arc
Registered Member #3960
Joined: Mon Jun 20 2011, 06:27AM
Location: Wuhan Hubei China
Posts: 33
Yes...this system work so well. Spend 1min G40N60A4 only 51°C~ And i think it can work in higher Bus voltage because you can see perfect Square wave in oscilloscope
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
how can you be sure your reallly putting out 3kW, flybacks due to thier air gap, the magnetic circuit is not easy to approximate.
If you cant measure the V and I simultaneously, im always skeptical as to output power claims based on merely heat rise after a short interval run time.
its still cool though, Its nice to see another having success without a ZVS/ZCS design.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Hi sir, nice work - can you show us what transformer are you actually using? It's hard to tell from your pictures.
IGBT's are pretty tough bastards as long as they are not let to overheat. I've ran a fullbridge of 30N60's up to about 25kVA with hard switching, for a while at 100kHz and they lived.
I think it was Steve Ward who initially spread the rumor of how horrible hard switching is compared to SLR topology. While it certainly is a benefit for capacitor charging, I'm not sure what it does when load are arcs - resonant frequency changes depending on arc length!
On the other hand, I think Steve mounted his igbt's with a single screw and sil pads. That might be the reason why they initially blew up.
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3KW flyback transformer CCPS{
