As noted above, the DC to DC buck & boost configuration (CM3, FIG. 4B) utilizes only a half of the full bridge (with half of the rated H bridge capacity), and it provides only one of buck or boost functionality at any given time. The topology or functionality reconfiguration/adaptation can be accomplished via software reconfiguration, and it does not require hardware changes (that is, does not require physical position changes) to any of switches SW1-SW9 or SW14-W16 position.

The operations of each of these effective circuits 300.1, . . . , 300.6 for various conversion modes (A/D-C?A/D-C, buck or boost, voltage source or current source) will generally be apparent to persons skilled in the relevant arts, based on the circuit elements and wiring connections illustrated.

AC?AC Conversion Modes: It will be noted with respect to FIG. 4C, for AC←→AC conversion (conversion mode CM5, A-PS 300.5), two A-PS's 300.5 would be needed and cascaded back-to-back as (AC?DC?AC) with a common DC link. Similarly with respect to FIG. 4D, an AC?AC conversion mode could be established by using two A-PS's 300.6 cascaded back-to-back as (AC?DC?AC) with a common DC link.

Role of Inductors: The presence of inductor L2 and effective removal (short-circuiting) of inductor L1 supports current source conversion; the effective removal of L2 (that is, the short-circuiting or current blocking on L2) supports voltage source conversion (with or without L1 being an effective part of the circuit); and the effective presence of L1 limits the circuit to DC-to-DC only conversion.