Power converter and circuit arrangement with such a power converter

A circuit arrangement, comprising:

• an electrical energy source and/or an electrical energy sink;
• a power converter, including:
• a first half-bridge including a first high-side semiconductor switch and a first low-side semiconductor switch,
• a second half-bridge including a second high-side semiconductor switch and a second low-side semiconductor switch,
• a first center switch,
• a second center switch,
• a first intermediate circuit capacitor,
• a second intermediate circuit capacitor;
• and
• an evaluation unit,
• wherein:
• a series circuit including the first intermediate circuit capacitor and the second intermediate circuit capacitor is connected in parallel to the first half-bridge and to the second half-bridge and is configured to be supplied with an intermediate circuit voltage;
• a first terminal of the first center switch is connected between the first high-side semiconductor switch and the first low-side semiconductor switch and is configured to provide a signal representing a first phase of the power converter;
• a first terminal of the second center switch is connected between the second high-side semiconductor switch and the second low-side semiconductor switch and is configured to provide a signal representing a second phase of the power converter;
• a second terminal of the first center switch and a second terminal of the second center switch are connected and configured to provide a signal representing a third phase of the power converter;
• the evaluation unit is configured to:
• actuate the first high-side and the first low-side semiconductor switches of the first half-bridge, the second high-side and the second low-side semiconductor switches of the second half-bridge, the first center switch, and the second center switch, in accordance with a space vector modulation, to generate the signals for the first phase, the second phase, and the third phase, which are configured to operate a polyphase energy system, and
• adjust a voltage ratio between a voltage present at the first intermediate circuit capacitor and a voltage present at the second intermediate circuit capacitor as a function of a respective position of the space vector in order to expand a maximum voltage range of the first, second, and third phases;
• and
• a polyphase energy system;
• wherein:
• the electrical energy source and/or the polyphase energy system is configured to provide the power converter with a voltage to be converted, and
• the power converter is configured to:
• convert a DC voltage into a polyphase output signal in order to operate the polyphase energy system, and/or
• convert a polyphase signal of the electrical energy system into a DC voltage in order to provide the DC voltage to the energy sink.