Transformerless inverter with - a step-down converter with - an input side with two input connections (E1, E2), an output side with two output connections (A1, A2), and one main branch (1, 2) each between one of the input connections and one of the output connections, - a capacitor series connection on the input side with at least two capacitors (C1, C2) connected in series between the two main branches (1, 2) - a capacitor series connection on the output side with at least two capacitors (C3, C4) connected in series between the two main branches, - a diode series connection arranged between the capacitor series connection on the side of the input and of the output, the diode series connection having at least two diodes (D1, D2) connected in series between the two main branches, - a middle branch connecting without further connection to the side of the input and the output an intermediate node of the capacitor series connection on the input side with an intermediate node of the diode series connection and an intermediate node of the capacitor series connection on the output side, - one storage choke (L1, L2) each in both main branches between the diode series connection and the capacitor series connection on the output side, - at least one diode (D3, D4) connected in parallel with one of the capacitors (C3, C4) each of the capacitor series connection on the output side, - one switch (S1, S2) each that can be controlled in clocked manner in the two main branches between the capacitor series connection on the input side and the diode series connection, and - a control unit for controlling the switches in a switch control mode where it switches the two switches at different times and/or in different switch positions; and - a pole reverser/inverter bridge circuit coupled with the output connections of the step-down converter. - a step-down converter with - an input side with two input connections (E1, E2), an output side with two output connections (A1, A2), and one main branch (1, 2) each between one of the input connections and one of the output connections, - a capacitor series connection on the input side with at least two capacitors (C1, C2) connected in series between the two main branches (1, 2) - a capacitor series connection on the output side with at least two capacitors (C3, C4) connected in series between the two main branches, - a diode series connection arranged between the capacitor series connection on the side of the input and of the output, the diode series connection having at least two diodes (D1, D2) connected in series between the two main branches, - a middle branch connecting without further connection to the side of the input and the output an intermediate node of the capacitor series connection on the input side with an intermediate node of the diode series connection and an intermediate node of the capacitor series connection on the output side, - one storage choke (L1, L2) each in both main branches between the diode series connection and the capacitor series connection on the output side, - at least one diode (D3, D4) connected in parallel with one of the capacitors (C3, C4) each of the capacitor series connection on the output side, - one switch (S1, S2) each that can be controlled in clocked manner in the two main branches between the capacitor series connection on the input side and the diode series connection, and - a control unit for controlling the switches in a switch control mode where it switches the two switches at different times and/or in different switch positions; and - a pole reverser/inverter bridge circuit coupled with the output connections of the step-down converter. - an input side with two input connections (E1, E2), an output side with two output connections (A1, A2), and one main branch (1, 2) each between one of the input connections and one of the output connections, - a capacitor series connection on the input side with at least two capacitors (C1, C2) connected in series between the two main branches (1, 2) - a capacitor series connection on the output side with at least two capacitors (C3, C4) connected in series between the two main branches, - a diode series connection arranged between the capacitor series connection on the side of the input and of the output, the diode series connection having at least two diodes (D1, D2) connected in series between the two main branches, - a middle branch connecting without further connection to the side of the input and the output an intermediate node of the capacitor series connection on the input side with an intermediate node of the diode series connection and an intermediate node of the capacitor series connection on the output side, - one storage choke (L1, L2) each in both main branches between the diode series connection and the capacitor series connection on the output side, - at least one diode (D3, D4) connected in parallel with one of the capacitors (C3, C4) each of the capacitor series connection on the output side, - one switch (S1, S2) each that can be controlled in clocked manner in the two main branches between the capacitor series connection on the input side and the diode series connection, and - a control unit for controlling the switches in a switch control mode where it switches the two switches at different times and/or in different switch positions; and - a pole reverser/inverter bridge circuit coupled with the output connections of the step-down converter.