Present Power Electronics Systems are built upon and resemble an INVERTED pyramid which is by definition unsustainable and ready to collapse at any moment. Why? At its bottom it has the buck converter as its foundation which than supports the next level single ended isolated converter like flyback and forward to culminate on the third level into bridge type converter with even more switching devices. Consequence: buck converter problems lead to collapse of the whole structure irrespective what switching devices are used.
The buck converter does have huge problems: device voltage stresses much higher than output regulated DC . . .
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