Bumping this to the top I had uploaded a couple of circuits yesterday. Can an LTspice subcircuit guru help me with passing a parameter, as below? relay_driver: can use this subcircuit for each of the

“Correcting” V1 to 311V peak / 220 V RMS, after a full minute of settling down, I measure: rb: RMS(v(b))=210.556 FROM 0 TO 0.02 rc: RMS(v(c))=219.988 FROM 0 TO 0.02 rd: RMS(v(d))=229.341 FROM 0 TO 0.0

:{) As long as the one working with the model understands that it’s not really 220VRMS, it works. In the end, it’s one constant to change, and it all works the same. I doubt even 1 Amp is used at 18V;

I’ll look at that, thanks! Switching primary taps will throw off the 18VAC winding, which adds complexity to analyzing the AC Stabilizer over-all design, but that’s the way Hasan’s (photo) design has

A wee bit, perhaps, but it’s a work in progress, and maybe a collaborative effort. RE: The measurements, I tried 0 compression, and the voltages changed by mV’s. There were markable fewer data points

I’m well aware of that, Andy! I set it at 220 so I could easily read the plot or in .meas, as if it were RMS. Ratiometrically, it really doesn’t matter, does it? Dave

I uploaded a couple of circuits, parts that may be useful in the AC Stabilizer design: TR1: a mostly successful basic simulation of the main autotransformer relay_driver: can use this subcircuit for e

Kerim, can you share that front end ACV range extender circuit? It sounds intriguing! Dave

I’ll update it tomorrow; getting late here. I got answers to most of my issues, so it may be a useful stating point. Dave

Loads were resistive, from the taps points to return.

I later extended the TRAN to over 1 second, then starting data at 1s. The currents definitely took 6-8 cycles to settle down, but voltages were essentially the same. “But there is zero coupling betwee

Ahh, unloaded, so (little to) no reflected impedance! In this simplified circuit, L2 is on top of L1, and is the 220V input, so the same current flows in L1. I tried loading the (buck, 210V) tap betwe

Same readings, within cursor positioning tolerance… Also extended the .tran until current transient decayed, around 60+ms. I plotted the currents in L1 and L2: Essentially identical , but + and – 6+am

.TRAN for 1010ms made no difference; same measurements at 1005m as at 5m

1: I know, but .meas at ½ cycle let me read the voltages easily. 2: I’ll try that; good suggestion!

Late night modelling certainly didn’t help! OK, replaced SQRT() with x**2 Tap-to-tap differences and voltages are slightly better. 18VAC winding is a bit worse, though. Still blows up with moderate lo

Please see my recent upload, Autotransformer.zip I need some tutorials regarding autotransformer modelling! I was intrigued by Hassan's AC Stabilizer and tried to model TR1 The model differed from my

The boost/buck question depends completely upon the taps of TR1. I believe there were 5 taps in the drawing, labelled A … E. If C was defined to be the 220VAC (Phase) input, then there would be two bo

Am autotransformer is modelled as several inductors in series, paying attention to the “start” marker. Once the inductors are lined up, write one “K” directive, to define the coupling among them; typi

There is nothing in the imaged circuit that cannot, in principle, be modelled in LTspice. The most obscure part is transformer TR1. The main winding (taps A … E) is most likely a specific, commercial