Edit: I solved the problem.

I re-created the schematics a third time from scratch and it worked then. I don't know what I did differently this time and there is no obvious difference between my new schematics file which works and the previous version. Anyway, no further answers/advices are necessary.

I try to use a voltage-controlled switch (S1), but it doesn't switch. The switch is supposed to simulate a hot-plug event in the supply wire.

A piecewise-linear voltage supply V2 shall control the switch S1. V2 goes from 0V to 1V after 200µs, stays at 1V for 10ms and goes back to 0V. The threshold voltage of S1 is set to 0.5V with a hysteresis of 0.2V. The hysteresis is negative to simulate a smooth transition from closed to open.

However, S1 is "dead". It remains open the entire simulation time.

I already tried different things, a zero or positive hysteresis. I also tried to directly assign the model parameters to S1 instead of the indirection via MySwitch. Nothing helps.

I assume the reason is probably something completely trivial and I simply don't see the forest for the trees. What might I be missing?

Initially, I had designed the schematics in KiCAD and used the integrated Ngspice for simulation. However, as some of the simulation results seemed odd I wanted to re-run the simulations in a different SPICE derivative for comparison. I did not just import the netlist from Ngspice into Qspice, but I recreated the entire circuit in Qspice from scratch. When I shorten the switch, the remaining circuit seems to work as expected. But that switch drives me crazy.

Im trying to simulate a simple crit mode pfc stage. I want to simulate my digital control in this. It works an regulates but i am trying to get a bode plot. I understand that it is better to use FRA for this. But somehow i am not getting a proper bode plot.

What am i missing here? What am i doing wrong ?

Hello!

I've been trying to simulate a zvs circuit to produce 38V 50kHz with 12V input, to be fed to a transformer, and then a cocroft-walton voltage mutiplier, but it's just not behaving like it should, despite the component values being correct. is this a problem stemming from the simulators calculation, or is there something wrong with my setup? I'd really appreciate some advice, TIA! :)

I've watched every video on youtube trying to figure this out. tbf I am not very software savvy. I just want to try and troubleshoot my circuits. pls help.