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Jeff, that is an interesting description and is new to me.? But the part that most puzzles me is this one: It seems that the polarity should matter.? I get it that the differential input voltage

Loads were resistive, from the taps points to return. Sent: Thursday, December 26, 2024 4:14 PM To: [email protected] Subject: EXTERNAL: Re: [LTspice] Autotransformer deep questions!

You are still struggling with a complicated transformer. Start with a simple winding with just one tap, with the mains supply across the whole winding, and no separate 'secondary' winding. When you

Don't even bother with the one that is physically impossible.? It doesn't matter if it simulates - it is wrong! Where are the loads connected? Andy

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

Several more things to note: It is never a good idea to simulate for only 1/2 of a cycle, or even 1 cycle - *especially* when inductors are involved!? A far better thing to do is to simulate for 10s

Dave, Start your sinewave source ( V1 ) at some phase angle. 10, 20 ... 90 degree should resolve the loading issue. With 10 degrees, I have a 10 ohm load at node F and a clear sinewave. Mike

The ideal fully differential amplifier is another description of a theoretical device called the nullor. A nullor has two ports: one port, has zero conductance, zero voltage across its terminals, and

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

Impedance of a 100mH inductor at 50Hz=31 ohms 220V into 31 ohms= about 7 amps

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 –

Use the cursor instead of MEAS statements, which are so easily wrongly-written.

.TRAN for 1010ms made no difference; same measurements at 1005m as at 5m Sent: Thursday, December 26, 2024 2:04 PM To: [email protected] Subject: EXTERNAL: Re: [LTspice] Autotransformer deep

1: I know, but .meas at ? cycle let me read the voltages easily. 2: I’ll try that; good suggestion! Sent: Thursday, December 26, 2024 2:04 PM To: [email protected] Subject: EXTERNAL: Re: [LTspice]

Inductance is proportional to N?, but voltage is proportional to N. You must redo your inductance calculation.

Two things I notice instantly: Primary voltage should be 311V. Voltages in SPICE are peak. You don't run a 50Hz transient for only 10ms.

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

Inductance is proportional to turns squared, not square root. Start with a simpler winding with one tap, and look at the directions of current flow. In an autotransformer, the 'secondary' current

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

LTspice has a few kinds of "ideal" models.? I used both kinds. If you used any "real" diode (one with a part number), there's chances of a few factors that could affect results. The ideal diode "D"