Re: Trsstc - Not so good, apparently

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Antonio Carlos M. de Queiroz" <acmdq@xxxxxxxxxx>

Tesla list wrote:

> Original poster: "Bob (R.A.) Jones" <a1accounting@xxxxxxxxxxxxx>
> Hi Antonio,
> Nice job on the simulators. I discovered the zoom function on the plots but
> could not
> find a shift function. Is there one? Some color on the reference waveforms
> would be nice.

I made an update in the programs today.
There are pan functions with the keys u, d, <, >, a, and r.
Now the reference has colors too.
http://www.coe.ufrj.br/~acmq/programs

> In primary feedback, the drive has a habit of changing phase relative to the
> input current so it sucks out the power.

Primary current feedback is to prevent this. Something that can happen
in the trsstc case is that the first oscillation in the primary current
is not enough to change its polarity, and so with primary feedback the
driver operates at a too low frequency.

> How about a version with C1 in parallel with L1 and some R in Vin, for a
> tube type configuration.

A realistic system would have to model the tubes too. Not difficult, but
I would have to take a look at how.

> PS:  It probably does not make much design sense to consider an open circuit
> (oc) driver
> looking in to L ie number overflow. That may be why you needed the R when
> you oc the driver

Yes, but in principle the driver could be switched off (I know that the
construction of the driver would be somewhat weird for this) when the
primary current crosses zero. I wanted to know what would happen with
the voltage over the open driver (it grows above the normal level).
The numerical problem happens with the free-wheeling diodes too. Try to
increase the resistance of the open driver and see what happens (before
the program crashes).

Antonio Carlos M. de Queiroz