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Registered Member #1875
Joined: Sun Dec 21 2008, 06:36PM
Location:
Posts: 635
So I was working on a capacitor charging power supply, based on the topology discussed at . I was thinking about testing the driver with a cw SSTC with a resonant capacitor in series with the primary. It prevents resonant rise but still makes life easier on the semiconductors, or so it would seem. Am I incorrect in that assumption? If so, why hasn't anyone done this?
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
If you look at the current waveform in a standard SSTC, you'll notice that the switching already takes place near zero current (depends on tuning/phase shift when using feedback).
Registered Member #289
Joined: Mon Mar 06 2006, 10:45AM
Location: Conroe, TX
Posts: 154
Your coil would still be a drsstc, you are simply turning the current off after the first half cycle. I have tried this approach before for both regular operation and audio modulation, neither produced great results...
Registered Member #1875
Joined: Sun Dec 21 2008, 06:36PM
Location:
Posts: 635
The secondary would be 50kHz, while the primary would be tuned to 100kHz in this mode of operation. The primary resonates naturally through the freewheel diodes but the driver prolongs current flow in one direction after the resonant circuit has emptied itself, preventing resonant voltage rise. That way you are running it at 50kHz but with 50% dead time.
At least that's how I think it works...
Dr. Kilovolt,
I don't understand how average SSTCs can be close to ZCS when there is so much more uncoupled inductance than mutual inductance in the primary circuit... The load should look almost completely reactive with such a loosely coupled system as an air-core transformer, shouldn't it?
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Soft Switching in non-DRSSTC SSTC
