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Registered Member #1951
Joined: Sun Feb 01 2009, 01:59PM
Location:
Posts: 105
hello evvery one. i have build steve's mini sstc. and i got some problem's. or atleast for sure one. so what i wanted to ask: the ucc..... ic's are getting really hot. what could be the reason? and what is the common amount of primary turns used on a tc?
Registered Member #289
Joined: Mon Mar 06 2006, 10:45AM
Location: Conroe, TX
Posts: 154
I'd say 3-10 turns is common. The lower the number of turns the higher the primary current and the longer the arcs, but the mosfets will also fail faster. Put a heat sink on your GDICs. If they are the DIP package you can use heat sink compound and just set a heat sink on top of them. If they are TO-220 it should be fairly obvious.
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Well, how hot are they? If it will burn you, something is wrong. Normally in my sstc's they get maybe a little warm, but not hot. Even when i ran 1.4mhz, and used a huge DC blocking cap and 12 turns on the GDT, they took awhile to get actually hot.
What value is your DC blocking capacitor? Are you *sure* everything is connected right? Don't leave any details out, something seemingly insignificant can be a big help.
Registered Member #1517
Joined: Wed Jun 04 2008, 06:55AM
Location: Chico CA
Posts: 304
I really hope this thread continues because I am currently experiencing the same thing with my coil. I currently have 10 turns and a .1uF ceramic blocking cap on the controller side of the GDT.
I was examining the output waveform on the o-scope, the bridge is currently empty... so no load on the output of the GDT. I noticed the chips were getting warm so I turned the controller off... I believe everything is hooked up correctly.
I am driving a full bridge of irfp460s at around 220khz and my UCCs are barely getting warm - you have some kind of problem. Have you checked the waveform on the gates of the FETs - the GDT might be saturating. Does the GDT runs warm/hot ?
Registered Member #1951
Joined: Sun Feb 01 2009, 01:59PM
Location:
Posts: 105
coillah wrote ...
I really hope this thread continues because I am currently experiencing the same thing with my coil. I currently have 10 turns and a .1uF ceramic blocking cap on the controller side of the GDT.
I was examining the output waveform on the o-scope, the bridge is currently empty... so no load on the output of the GDT. I noticed the chips were getting warm so I turned the controller off... I believe everything is hooked up correctly.
hmm
yes i have execlty that problem too, i was watching the wave form too on my osciloscoop. when i noticed that they got hot. so i shut evvry thing down.
arcstarter: dc blocking capacitor? the one in the gdt circuit at the driver side? that one is the valeu on the schematic. they got untouchable hot. (the ucc ic's)
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steve's mini sstc isseu heat with the ucc37... 22 and 21 ic's/ EDIT: A new problem arises.
