Regenerative Load Circuit
This can regulate V1 or V2 regardless of which one is higher, depending on how the FET's are switched. It could also regulate current with appropriate feedback. And it can regulate irrespective of power flow direction. So, for example, V1 could be a battery. V2 could be the output from a buck or boost converter. The load current could be regulated.
I just kind of made up the inductor and capacitor values. Obviously it would depend on the application.



simulate this circuit &ndash; Schematic created using CircuitLab