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Hi Sven
I think (maybe) for your system, to fill capacitors all by themselves, and ONLY capactors. (stage one)
Then discharge ONLY capacitors to the load. (stage two)
This is similar to diode plug, but there is a difference because
what might go wrong, is during discharge, the capacitors have been disconnected from the inductors and diodes that filled them up....so there is a sudden moment when the load of the capacitors being filled has vanished..(vanished during the cap discharge to load moment) and this could cause many problems including "perhaps" reflection to primary from the very sudden change in impedance of the "load" of filling up capacitors.
So solution is to have two parallel cap and diode systems ( A and B) working filling up the caps during stage one, and so the caps A will always fill whenever caps B discharge and caps B always fill when caps A discharge.;....
Difference with diode plug then, (I think) is there will be some moments in time when BOTH caps A and B fill at the same time too....so this description is not exactly like the diode plug but rather, I would call it a
"parallel dual two-stage cap discharge output circuit"
So, there will changes of impedance to the impedance seen by system as the caps fill and discharge, but no so "severe" of changes....it will be the impedance of parallel caps A and B for some time, then there will be the impedance of filling just one cap A or just one cap B for the time chosen for whenever a cap A or a cap B discharges to a load....
Advantages of this are you are not "restricted" to only filling caps for that sinewave portion "allowed" such in diode plug, or for discharging only during that sinwave portion allowed....
Instead, such as if you have a farily high frequency system, you could for example be filling caps for lets say 10 cycles, or 100 cycles, then discharge just one of the caps A or B after those cycles to the load and discharge caps in alternating fashion and alternating polarity, if you choose, if you want AC output....
So it could be possible to have for an example, a 500hz system, but there is chosen to be a cap discharge output of 50hz and you could even have the cap discharges mock the normal grid sinewave too if you want...
One more thing, some caps are "storage" type capacitors, made simply to store joules of energy for some time, while there are more specialized capacitors made especially to be pulsed and certain frequencies, and to only store the energy for brief moments of time so maybe choice of capacitors will be very crucial to successful OU system, sorry I cannot recommend particular capactiors but look up and study "pulse-type capacitors".
ciao
Kone