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After the Micro SSTC 1 i decided to build something bigger. So i decideded to use this circuit http://www.ctc-labs.de/html/micro_sstc_2.html . I was wondering is there anything that must be changed/added to the circuit. I saw a little error - the full wave rectifier on the 12v supply is connected wrong. Also i was wondereng should be there any snubber capacitor across the half bridge or this function is done by the two capacitor connected in series. Tommorow i will post some pics on my progress. Huben
**Update ** So i finshed the circuit board and hook it up to test it. The cd4046 is generating a square wave (without secondary and antena) about 600khz when the tuning pot is fully counte-clockwise. So hire is the question - when i turn the pot (10k one on the circuit) the frequency starts to change - aqtualy decrizes to about 450khz when the pot is fully clockwise. Is this normal, because i think that this shoud change the phase not the frequency ? The other problem is with my driver chips - the waveform that i get on the otput of the transformer is more like sinusoidal rather than square weve, but i hope that this will change with the tc4420s (now i was using ICL7667 witch are 2x1.5A each )
Hire some pictures, please comment any flows in my layout and excuse my english
Registered Member #105
Joined: Thu Feb 09 2006, 08:54PM
Location:
Posts: 408
Its nothing about you, and I would attempt to answer, but I've got no experience with PLL circuits- however, your circuit board design looks very nice for a protoboard!
I'd answer too, if I'd ever built an SSTC before! I've been working in a rather Luddite mode for the last few years as far as technology goes, so I haven't touched anything with IGBTs or big MOSFETs. Your driver does look luvverly, however! *grin*
Don't feel bad . . . no one's answered my OBIT filtering question either . . . *sniffle*
Thanks for the repplyes guys So todday i received the drive ICs (TC4420). I put them in and tried them. The traces on the scope didn't look very good at all . They are better from the ones with the ICL7667 but i don't think they will lork .
So hire are the traces. They are the gate - source signals. The top one is with 2 ICs (like on the schematic) and the bottom one is with 4 ICs (2 in paralel). The scope is set to 0.5 micro seconds/div and 10V/div. So what do you think about them ???
Registered Member #514
Joined: Sun Feb 11 2007, 12:27AM
Location: Somewhere in Pirkanmaa, Finland
Posts: 295
Those scope shots look fine. You could have a bit faster rise and fall times, though. Some beefier drivers should help with this. Won't probably be a problem tough.
The fets are IRF740 - half bridge. Shoud i use 4 or go with 2 drivers. I was concerned about the loses at this high speeds
Dalus - this is cd4046 generating in the moment without the antena (i will add it later when everything is set ) The frequency of the secondary is about 450khz so there will be not a big difference - i think .
Also when i use 2 drivers they get a bit warm - i suppose this is OK - wright ?
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SSTC questions
. They are better from the ones with the ICL7667 but i don't think they will lork 
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