Please post the zipped *.asc file at Edaboard, or rename it to *.txt.
I'll do that tomorrow. I've been looking mostly at the capacitor charge waveforms.You should probe the MOSFET gate and drain waveforms and compare with the simulation results.
Can you measure what the input current/voltage is while the output is charging? Can you show some waveforms of the winding voltages?
The current limiting device does go into current limit as the filter caps charge. But once the system has started, the current draw should be below 400mA.You'll notice that on startup the current draw exceeds 0.5A, which might be causing your current limiting switch to trip. And that's not counting the quiescent current of the other circuitry (especially the 12V isolated supply). What happens if you remove some of the extra circuitry and just test the relevant parts that are in the simulation?
Just not possible because the MOSFET is clamping negative voltages. Suggests that the measurement results are somehow crappy. Or you have a bad circuit layout with huge parasitic inductances. In the latter case I won't be surprised about erratic behavior.10x probe, across the primary coil. Voltage goes from +40 to -40.
Now for a loaded transformer the peak current should be well higher. The current taken by the load, times the turns ratio.
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