This time I faced with another sort of problem. I've decided to install smaller capacitor to check if it has anything to do with efficiency, I was interested to get significant voltage increase on capacitor during charging cycle, and I've got it ;D

Energy goes from coil to a capacitor and in some cases, then energy oscillation is quite noticeable, it charges capacitor too much, voltage raises and does some bad stuff to LM7805 stabilizer, which powers comparator and logic gates. Couple milliseconds and they are on fire! Beautiful sight )

My board has an option to connect logic-power (typically 14V, to power up MOSFET driver) and power-power (typically 21V and more) independently, so, you may ask... Why I'm burning components instead of doing that? Simple - I have only one PSU now. There is another 0-200V/5A on the horizon, based on compensator, I would use it in future, probably.

Since last post I rescued control board couple times. Also I found, that overall inductance (as a capability of storing magnetic energy) is meaningful to efficiency, it just becomes a radio transmitter with small inductance (working onto 14 MHz frequencies)

Also, I wasn't able to get efficiency higher than 75-80% on steel cores even with amazing coil of an industrial-grade solenoids. I tried ferrite core and got nothing from that too, but as I told - there wasn't enough inductance, so it's probable, that on more complicated winding it would work well, since ferrite isn't as conductive as steel.

What I'm gonna do next? Well, it's an end of summer, I have no intention to skip this wonderful season, also I work onto another project, commercial one, so I have less time to work onto this one, sadly
However, I have an intention to make my work easier: in this month I want to find more efficient way to utilize magnetic field produced by an electromagnet, instead of making that hardcore pure-Fe production line, this would make technology more convenient to replicate, it is already convenient in all aspects, excluding electromagnet production, it's a nice target , )