I had a weird idea : cross-link the gates of the MOSFETs to the output of the others.
Falstad says it should oscillate freely !
By trickling some current during the cycle, the total energy increases and the peak reaches 27V for a 24V PSU. It's like a swing, the point is to kick at the right moment to go with the move, but just enough to compensate for the losses.
Yann Guidon / YGDES
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