Re: Pushing the IGBT Envelop

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

Original poster: "Dr. Resonance" <resonance-at-jvlnet-dot-com> 


That's Greg's Advanced Lightning Facility (ALF).

Dr. Resonance

 >
 >  > Original poster: "Greg Leyh" <lod-at-pacbell-dot-net>
 >
 >  > Nice program!  I'll have to work with it some more to understand it
more
 >  > fully, though.
 >  > For some reason it took my inputted values and changed them?  I
probably
 >  > entered them
 >  > in the wrong spot.
 >
 > The program really has some unclear parts... When you choose one of the
 > two desigh buttons, what you have entered after pressing the "edit
 > elements" button is replaced.
 > The "lossy design" is the impedance matching idea using
 > a Butterworth filter. It optimizes the input impedance for a certain
 > amount of load. The "lossless design" is similar to the design of a
 > magnifier, with the operation mode defined by three integers k:l:m,
 > that are the ratio of the three frequencies that appear in the
 > waveforms. Note that both designs are almost identical if the load
 > is removed. The other parameters are for the built-in simulator, that
 > always works over the element values that appear when the "edit
 > elements"
 > button is pressed. The simulator assumes a linear resistive load, that
 > is on of off all the time, and leaves the driver operating all the
 > time (to be improved later).
 >
 >  > Have you studied primary drive scenarios that attempt to recover the
unused
 >  > energy from
 >  > the secondary?  I think this feature will be essential for the ALF.
I'm
 >  > presently designing
 >  > an energy recovery scheme into the 1:12 scale ALF prototype, and hope
to
 >  > test it soon.
 >
 > The lossless design ideally recovers all the energy, at least if some
 > of it is removed from the output capacitance at the instant when the
 > maximum voltage is reached. It would also recover most of the energy
 > left unused by a load connected to the output when the output voltage
 > is close to the maximum. But the driver would have to operate with
 > reverse
 > current for this, and be active for the full output "beat".
 >
 > What is ALF?
 >
 > Antonio Carlos M. de Queiroz
 >
 >
 >