AC/DC converter stage for converter system with input series structure with improved common mode performance

A converter system with an input series structure comprising:

• at least one phase unit configured to receive an input AC voltage comprising at least two converter units that are electrically connected in series at the input of the converter system, wherein at least one converter unit of the at least two converter units comprises an AC/DC converter stage as a first converter stage, and the AC/DC-converter stage comprises:
• two input terminals configured to input an AC input voltage (Vin) to the AC/DC converter stage;
• at least a first circuit branch with at least two switches that are electrically connected in series at a first connection point, wherein a first input terminal of the two input terminals is electrically connected to the first connection point of the first circuit branch;
• at least one first electrical storage configured to provide a DC output voltage, the first electrical storage being electrically connected in parallel to the first circuit branch;
• and
• at least one controllable bidirectional switch electrically connected between the two input terminals.