Charging station for electric energy storages of electric vehicles comprising : — an input circuit for connecting the charging station to an electrical power source ; — an output circuit for connecting the charging station via charging plugs to the electric energy storages of electric vehicles ; — an electrical direct current charging buffer with a positive terminal and a negative terminal configured to be charged by the electrical power source ; — a n-phase transformer for galvanic isolation of the input circuit from the output circuit with primary windings (L' 1 , L' 2 , L' 3 ) on the input circuit side and secondary windings (L" 1 , L" 2 , L" 3 ) on the output circuit side; — a sensor for sensing at least one of voltage or current consumed during charging the electrical operated vehicle providing a sensor signal that is indicative of the sensed voltage and/or current; — the output circuit being connected to a switching circuit ; — the switching circuit adapted for periodically connecting the positive terminal of the charging buffer and the negative terminal of the charging buffer to the primary windings (L' 1 , L' 2 , L' 3 ); and — control means for receiving the sensor signal and configured to control the switching circuit to provide a predetermined voltage and/or charging current, characterized in that the charging station further comprises a mode selector circut and a bridge rectifier (RD1, RD2, RD3, RD4), wherein the mode selector circuit is configured to receive a mode signal which is indicative whether the electric energy storage requires AC current or DC current and wherein the mode selector circuit in DC charging mode is configured to connect the bridge rectifier (RD 1 , RD 2 , RD 3 , RD 4 ) to the at least one secondary winding (L" 1 ) of the n-phase transformer and in AC charging mode is configured to disconnect the bridge rectifier (RD 1 , RD 2 , RD 3 , RD 4 ) from the at least one secondary winding (L" 1 ) of the n-phase transformer. — an input circuit for connecting the charging station to an electrical power source ; — an output circuit for connecting the charging station via charging plugs to the electric energy storages of electric vehicles ; — an electrical direct current charging buffer with a positive terminal and a negative terminal configured to be charged by the electrical power source ; — a n-phase transformer for galvanic isolation of the input circuit from the output circuit with primary windings (L' 1 , L' 2 , L' 3 ) on the input circuit side and secondary windings (L" 1 , L" 2 , L" 3 ) on the output circuit side; — a sensor for sensing at least one of voltage or current consumed during charging the electrical operated vehicle providing a sensor signal that is indicative of the sensed voltage and/or current; — the output circuit being connected to a switching circuit ; — the switching circuit adapted for periodically connecting the positive terminal of the charging buffer and the negative terminal of the charging buffer to the primary windings (L' 1 , L' 2 , L' 3 ); and — control means for receiving the sensor signal and configured to control the switching circuit to provide a predetermined voltage and/or charging current, <EOS>