Impedance change in SST Magnifier

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Original poster: "John Tomacic by way of Terry Fritz <twftesla-at-qwest-dot-net>" <tesla_ownz_u-at-hotmail-dot-com>


Hi everyone, Happy Holidays!!

I have a question about an observed impedance change in the operation of my 
soild state magnifier coil. While operating in CW and interrupt modes the 
impedance of the coil was constant at Fres for various power input levels 
below 3 Kwatts. I changed the drive transformer to increase the power to the 
magnifier coil to about 3.7 Kwatts based on the previously measured 
impedance.  Everything was as expected in CW operation, with the impedance 
constant as with lower power levels.  However, when running the coil in 
interrupt mode, at Fres, under certain conditions (ingterrupt duty cycle 
about 30%, frequency 107 Hz)the impedance of the magnifier dropped to less 
than half of what it was before, then slowly oscillated between the two 
values at about one to 3 hertz.  At this low impedance level the controller 
was pumping about 10 K watts peak into the magnifier, producing 24" arcs to 
a hand held aluminum rod (see picture attached).  Does anyone have an 
explanation as to what's happening, and has anyone else observed this?

http://hot-streamer-dot-com/temp/DSC00008m.jpg

John Tomacic