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Full Bridge SSTC Staccato testing 120VAC
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This is still just a general testing phase of this Steve Ward DRSSTC-1 driver on a H-bridge before attempting to drive it at primary LC resonance.
The H-bridge is wired on a PCB with 12awg and solder jumpers. There are thick traces for the capacitors and a gang of protection for the IGBT's. The DC cap is temporary and will eventually need one that actually costs money. Another consideration is adding a PLL stage between the schmitt trigger and gate drivers.
The layout is not what I'd like in a final build but so far it actually seems to run without excessive ringing. The GDT is massive because I was lazy and couldn't fit the cable I had in a smaller core.
The overall output so far isn't a let down but running it unfiltered has some issues until reaching 120vac.
When running nearly any kind of interrupted arcs (except maybe 1khz at high on times) the logic supply doesn't draw more than a couple hundred milliamps or so at 20V input. It only starts working the 15v linear regulator hard in CW at bridge frequencies above 350khz or so.
While I think 120vac operation is still impressive in the various drive methods this bridge should be able to easily handle 400VDC or so even though the current pri/sec arrangement wouldn't. 240VAC would likely look really good staccato. The next phase of testing will be setting up a reliable CW mode which will likely push the limits of my 5A variac.
The H-bridge is wired on a PCB with 12awg and solder jumpers. There are thick traces for the capacitors and a gang of protection for the IGBT's. The DC cap is temporary and will eventually need one that actually costs money. Another consideration is adding a PLL stage between the schmitt trigger and gate drivers.
The layout is not what I'd like in a final build but so far it actually seems to run without excessive ringing. The GDT is massive because I was lazy and couldn't fit the cable I had in a smaller core.
The overall output so far isn't a let down but running it unfiltered has some issues until reaching 120vac.
When running nearly any kind of interrupted arcs (except maybe 1khz at high on times) the logic supply doesn't draw more than a couple hundred milliamps or so at 20V input. It only starts working the 15v linear regulator hard in CW at bridge frequencies above 350khz or so.
While I think 120vac operation is still impressive in the various drive methods this bridge should be able to easily handle 400VDC or so even though the current pri/sec arrangement wouldn't. 240VAC would likely look really good staccato. The next phase of testing will be setting up a reliable CW mode which will likely push the limits of my 5A variac.
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