Abstract: A converter arrangement connects to a DC source or load and to a plurality of AC terminals. Each converter arrangement includes a DC part with two capacitors arranged in parallel to the DC source or DC load and a neutral DC point between them. At least one AC leg is connected to a neutral AC point via an AC leg capacitor. A pre-charge unit is arranged at each leg of the AC terminal. The method includes opening a decoupling switch and all second AC switches; loading the pre-charge unit; sequentially closing each second AC switch; measuring at each closing step a voltage between each AC leg of the second converter arrangement; and determining the stuck AC switch of the second converter arrangement based on the measured voltage.

Abstract: An electric vehicle charging station includes: an electric power interface for receiving electrical power from an electric power source; a plurality of AC-DC-voltage converters electrically supplied by the electric power source, each AC-DC-voltage converter of the plurality of AC-DC-voltage converters having an AC-DC-power capability relating to a maximal possible AC-DC-power provided by the AC-DC-voltage converter; a plurality of DC-DC-voltage converters electrically supplied by the plurality of AC-DC-voltage converters over at least one DC-bus, each DC-DC-voltage converter of the plurality of DC-DC-voltage converters having a DC-DC-power capability relating a possible DC-DC-power provided by the DC-DC-voltage converter; a plurality of charging terminals for charging an electric vehicle, each DC-DC-voltage converter providing electric power to one charging terminal of the plurality of charging terminals; and a control device for scheduling the AC-DC-power of the plurality of AC-DC-voltage converters to the p