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Re: Circuit Analysis: DRSSTC
Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>
Hi Greg,
At 09:37 AM 6/20/2006, you wrote:
Hi All,
Is their a primary circuit schematic and waveform set that defines
the quintessential DRSSTC?
Almost "any coil" with the "drive" as a say +- 300V square wave
synced to drive the primary current...
Searches of pupman archives seem to hint at resonant primary
switching, with relatively long (>>6 cycles) dwell times -- similiar
in nature to a resonant-mode converter.
DRSSTCs can "drive" as "long as they want" until a current limiter is
reached or the silicon spills all over the ceiling :o)))
I had originally thought that the DRSSTC uses a full-wave bridge, in
a hard switch-mode approach (square primary voltage waves, ramped
primary current waves, sinusoidal secondary V&I waves.)
There are half bridges too... Dan's DRSSTC III is a half bridge
drive... But they are all "hard driving" given their specific rail voltages...
I'm currently running a batch of simulations in Simplorer
(Ansoft...), and wanted to further characterize the relative
efficiencies and drawbacks of various primary switching topologies.
You just "drive it" ;-))) Being able to do drive the switch over at
the "zero current crossing" is a big deal. Most circuits do the
crossover significantly "late". The propagation delay between the
current transducer saying "go" and the IGBTs actually "doing
it"... Usually not a giant problem at all..
If you are doing "batches".... ScanTesla is probably "all done with
it" by now ;-)))
http://drsstc.com/~sisg/files/scantesla/scantesla762.zip
A "secret" later version with advance streamer modeling. But the
streamer constants are still in "flux":
http://drsstc.com/~sisg/files/SISG-coil/ScanTesla763/scantesla763.exe
http://drsstc.com/~sisg/files/SISG-coil/ScanTesla763/scantesla763.c
But "bleeding" edge there...
Cheers,
Terry
Best Regards,
Greg