> Looking at smps + synchronous will quickly show you that  the term
> "synchronous rectifiier" is pertinent.


Speaking of synchronous rectifiers, they've been around for a LONG time.
In the 1950s, some vacuum tube car radios used synchronous rectifiers.
They used a "vibrator" to chop the car battery DC to AC. Another set of
contacts on the vibrator were connected to the secondary of the high
voltage transformer to select which end of the winding to use. The
secondary was switched in sync with the current in the primary.

Harold

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