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Registered Member #99
Joined: Thu Feb 09 2006, 06:10PM
Location: florida, usa
Posts: 637
EastVoltResearch wrote ...
wrote ...
I have numerous 40n60IGBTs that have been "compramised" through priar failures. They test fine with a diode checker, as well as resistance check.I have heard a theory that while they may test fine, in operation they are doomed to fail.
Yes, this can be a problem. In my demonstration coils, if i blow even a single IGBT, i replace all four just to be safe.
Ive since put them into action in my new coil and they seem to be doing just fine....No problem making arcs and actually stay rather cool considering im running around 600khz freq...Ive also used a small MMC for drsstc operaftion as well and still no problems. One thing is that the old coils in which these IGBTs "brothers" blew were all at relatively low power and very few catastrophic deaths. Most were due to being out of tune and letting the power full blast with my large 10,000uF voltage doubler
Any ideas on a xmfr for measuring bridge waveforms?I know the usual method is a differential measurement, but i just broke my spare probe and dont feel like getting a new one just yet. Matt
Also, my sparks are no longer so puny...While the lenght hasnt increased, the intensity has. I raised the primary till i got racing sparks and then lowered a tad. Now they appear like a drsstc. Drsstc operation will likely put me at my stopping point soon, as i dont want sparks any longer than my secondary this time(no more 3 and 4 times the lenght madness ) Soon i will audio mod it. Ive got a DIP switch wired to change from interrupted, non interrupted, and audio. Can i simply feed in an audio signal and get results?Say from a crappy old mp3 player?
Registered Member #99
Joined: Thu Feb 09 2006, 06:10PM
Location: florida, usa
Posts: 637
Fianlly blew an IGBT!Wow what an explosion!I had the interruptor just pulsing it slowly with my large voltage doubler PSU(10,000uF capacitors)
I have a Q-WHat is an easy way to assure the PLL is locking correctly?Do i simply observe the waveform on the bridge output, in other words the primary while it is running via my scope?
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
If the sparks don't change size when you change the resonant frequency by bringing a hand (or grounded metal object) near the coil, then the PLL is probably working all right.
Registered Member #99
Joined: Thu Feb 09 2006, 06:10PM
Location: florida, usa
Posts: 637
Steve Conner wrote ...
If the sparks don't change size when you change the resonant frequency by bringing a hand (or grounded metal object) near the coil, then the PLL is probably working all right.
Yea i thought this would be the case...The sparks will shrink away until i adjust the PLL until the stay put...Just wanting to make sure.
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[moved] mini DRSSTC/Singing arc
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