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The "drivers" are evidently those little clusters of inverters
and discrete BJTs. I think this scheme is doomed, the optos
are slow and dissimilar (& not well controlled) delay / edge
rate, there are inverters placed in the gate legs of the
power FETs trying to make phase inversion but standard
inverters are too weak and too low-voltage.
If you really need isolation as shown, might look into
newer isolated gate driver chips. Or, a better isolation
in the digital domain followed by a full bridge driver IC
that does the proper phasing. Rather than making the
uC do an idiot's job creating phases that counteract
all of the hardware timing nonidealities, yet doing no
useful regulation at all. Is the point simply to say you
did a "digital power converter"? Because that's about
the only reason for a uC here.