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[elgersmad]

This is changing the subject, but when I was member of Tesla Pupman, I wrote about this same circuit.  A Ph. D Student then went on to write paper on the subject of multiple resonant circuits.  At that time I was working on circuit harmonics, where the fundimental frequency was on the output, and each an octave up to the input.  So, the input was resonant at 1MHz, the next stage 500KHz, and the last 250KHz in order to utilize larger and larger cores effectively.  It works, and quite well.  Sometimes, it will do some strange things but, the average power doesn't really change at all.  It just allows you to better utilize larger powdered iron cores or ferrite cores.

The real difference is that you'll need to run your simulations for a much longer time frame, and it would require a computer or allot time to calculate average power with some of the circuits.  It tends to maintain a chaotic output.  With real components, you do want to have every other ground 180 degrees out of phase to achieve maximum power.  Ground, shouldn't be starved of free electrons, and hot electrons work better.  The only way to manage that is alternate ground stage per stage and the computer may or may not model that correctly.  An electron can heat up to 10s of thousands of degrees, and never really change the temperature of the material, and if anything recognized as a static potential lost in the conductor.  If you just alternate grounds stage per stage, and keep them 180 degrees out of phase, you'll have hot electrons.

[elgersmad]

Metglas VS Powdered Iron

If you want a resonant reactor, that will produce more energy than it uses, and last a decade in operation, use metglas.  The thermal properties of metglas allow it to operate at 150C, where most ferrites and iron powders can't even come close.  Powdered Iron, or Ferrite will most likely not last a whole year, whereas metglas will operate at 150C, where powdered iron and ferrite deteroirate rapidly at must 200C.  Ferrite is cheap, and good enough to prove that it will work but, it is far from ideal.  Amorphous metglas is in there for the job and lasting at least a decade in operation if you are extracting heat from the core.  If you're working with lighting, then there is no need to see the cores overheat or change in temperature more than 10 degrees C in operation.  If it does heat up beyond that, then use a larger core.

[elgersmad]

In this set of equations, do no square Pz² in the formula.  When I wrote it, it's just a reference to a power equation, and I was remembering that I had to reverse the square by finding the square root.  So, when you work the equation, Pz and Pz² should be the same and equal.  Do not actually square it.  Rw, does need to be squared before being subtracted.

I appologize for my unwritten mental note being stuck there.  It should look like the second set of equations.

[elgersmad]

Now, this equation should work better with the simulator, where T, is actually the time step.  It uses that to calculate angular frequency at the moment and convert it into the equivalent of 2*pi*f.  Which then takes frequency away from the AC source, and calculate it as rapidly as the load might change, expanding the merit of the model.

Stick with the 2*pi*f equation for now.  I keep trying to figure out how to convert di/dt to XL, or frequency.  di/dt, for any given moment is really the quarter frequency of a triangle wave.  Sine, is a different function.  But, the way the simulator steps, the adjustment would or could make it more accurate to a smaller time step.  I don't see this one working because, the time step doesn't directly translate to a frequency.

[elgersmad]

I sat down today to plot a graph of the Primary's Inductance in relation to the load on the secondary.  I did find that as I moved the potentiometer from 1 Meg to 0 Ohms, the inductance of the primary windings do change without question.  I also found that at about 70K Ohms, it has maxed out as if the secondary were open, and it didn't matter from there up.  At that point, I realized that LMax for LP_Variable is really required to keep the model accurate.  Where, LMin, is really the Leakage inductance, and LP_Variable, is usually defined as the Mutual Inductance.  So, the whole truth is that in using circuit simulations, the models that are typically used will not produce actual results due to the simple fact that the Primary's inductance will not change.  Most models do not support that event, which is typical and normal for the operaton of any transformer having either a step up or step down turn ratio.  In the circuit simulators, it has become obviouse too me that you cannot just flip the schematic model, but would require two for the same transformer.  One model used when the transformer is used as a step up, and another to be used when the same part is being used as a step down transformer.  LMax, is the stopping point in the inductance calculation based upon the formula/equation I provided.  Until I get a decade box, I won't be able to plot a primary inductance to load resistance plot to tell me if it's linear, which I believe is true, or a curved change.  I must check that.  When you design your spice model equaton, you have to remember to write the equation to stop at LMax, which is or should be a measured value of inductance.  The models should always be based upon measurements.  Then I'll link it to my computer, and preform a frequency sweep, and I wish I had a programmable Resistive Decade Box.