Usually I've found some amount of DC resistance in the primary. This is from measuring a few power transformers using my ordinary multimeter.
It is a low ohm value therefore it does not hamper efficiency too much. I suppose it is built in by manufacturers as a precaution, so as to limit current draw to a reasonable level in all situations, ranging from no load attached to the secondary, to a shorted secondary.
By the way, since you want DC output, you might consider an alternate method, namely to send house voltage through a capacitor-action voltage multiplier.
Can I achieve 400v @ 400mA with cap multipliers?
Yes, the simplest arrangement uses 2 caps and 2 diodes. However you might want to construct gangs of capacitors since they have several hundred mA going back and forth through them, at 50 (or 60) times per second.
Can I achieve 400v @ 400mA with cap multipliers?
There's no single "discharge cap" in the shown schematic in #9.Also I changed the primary discharge cap which will dump energy into crossover inductor from that electrolytic to this far more reliable film cap.
Your project sounds similar to charging an experimental railgun. The capacitors need to be robust, to fulfill demanding specifications for volts and Amperes. It is common to build banks of capacitors in parallel.
When you first apply power, you'l get severe startup surge through diodes and capacitors. It's a good idea to examine railgun circuits, to see how they get past certain hurdles.
If you want to draw 15A from house voltage, stepping it up 2 or 3 times, then a simulation reveals that Farad values from 1000 to 10,000 uF might be suitable. Where my simulations show one capacitor, a real-life circuit ought to consist of a bank of several capacitors.
Asking too much to expect a screenshot of your simple circuit? It would also help to know that you posted a Ltspice schematic in the zip file.
A good chance to trip any MCB, if present in your distribution board.
Asking too much to expect a screenshot of your simple circuit?
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