Re: 10+MHz SSTC Gate Drive Circuit Finalized

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: Kchdlh-at-aol-dot-com 

Still more on this...

With 12 V or so of TX1 amplitude & with, say, 100 KHz operation, the E x T 
value for TX1, in my schematic, is 12 V x 5 us or 60.  Per DigiKey, Tamura 
makes a # SST-104 "triac trigger" transformer (DigiKey #MT 4304) that has 
an E x T of 90, with 1 mH of inductance.  That's what I'll plan on using, I 
think.

It seems as if getting a value of 90 with only 150 uH of inductance is 
unlikely.

I thank Dave Lewis for the suggestion; I'll try adding IRFP460A MOSFETs to 
my simulation, with appropriate d:g capacitances, & see what happens...

Bob Pease notwithstanding, this is so much better than tedious 
workbench-fussing!  I've had 60 years of that.  He's a first-class circuit 
designer but he's also an old curmudgeon and I say it as one who knows 
one.  I suspect he became disenchanted with computing about the time analog 
computers went obsolete.

KCH

In a message dated 9/23/03 5:52:42 PM Pacific Daylight Time, 
tesla-at-pupman-dot-com writes:
Original poster: Kchdlh-at-aol-dot-com

More about this...

Learning simulation as I go along, I've just downloaded some Zetex SPICE
models & put them into SIMetrix, then put ZTX649s & -749s into my
schematic.  I now get 100 ns rise & fall times between 10 and 4 V.  Also,
no output-voltage overlap above 1 V, not even at the start.  So much for
the old-timey 2N2222s and 2N2904s...

I also changed the frequency to 130 KHz (more closely matching my sec's
Fr)& the transformer coils' inductances to 150 uH (easier to make); plus, I
added 10 K pull-down resistors  for the loads.

Nice!

Ken Herrick
<mailto:kchdlh-at-juno-dot-com>kchdlh-at-juno-dot-com

P.S.  Juno still blocks pupman!!
In a message dated 9/22/03 6:37:24 PM Pacific Daylight Time,
tesla-at-pupman-dot-com writes:
Original poster: "K. C. Herrick" <kchdlh-at-juno-dot-com>

Dan (& all)-

I'll prevail on Terry once again to post this revision--I hope, final--to
my suggested SSTC driver;
<http://hot-streamer-dot-com/temp/ssdrvr-kch7.pdf>http://hot-streamer-dot-com/temp/ssdrvr-kch7.pdf.


[snipped]