2-level buck-boost DC-to-DC converters with virtual grounds

A conversion circuit comprising:

• a direct current (DC) link including a plurality of DC link rails;
• a first DC-to-DC converter comprising a first phase leg;
• a second DC-to-DC converter comprising a first phase leg;
• a first reactor connected between a first center terminal of the first phase leg of the first DC-to-DC converter and at least one energy storage module;
• and
• a second reactor connected between a first center terminal of the first phase leg of the second DC-to-DC converter and the at least one energy storage module,
• wherein the first reactor, the at least one energy storage module and the second reactor are connected in series between the first center terminal of the first phase leg of the first DC-to-DC converter and the first center terminal of the first phase leg of the second DC-to-DC converter such that the conversion circuit has a virtual ground.