A system for charging a battery of at least one electric vehicle, comprising: a plurality of central converters (40a-40d), each of the plurality of central converters (40a-40d) having an AC input electrically connectable to an external AC power supply, each of the plurality of central converters (40a-40d) having a DC output, and the DC outputs of the plurality of central converters (40a-40d) being serially connected; at least one switch, each of the switches (41a-41g) having a plurality of throw terminals (T1-T5) being respectively electrically connected to terminals of the DC outputs of the plurality of central converters (40a-40d), each of the switches (41a-41g) having two pole terminals (P1, P2), characterized in that each of the switches (41a-41g) having an actuator for switching between electrical connection of one of the pole terminals (P1, P2) and one of the plurality of throw terminals (T1-T5) and that of the one of the pole terminals (P1, P2) and another of the plurality of throw terminals (T1-T5) so as to selectively supplying a voltage at a central DC output between the two pole terminals (P1, P2) as a central DC voltage; at least one transformer, each of the transformers (42a-42g) having a primary winding circuit and a secondary winding circuit, and the primary winding circuit being electrically connected to the external AC power supply; at least one distributed converter for supplying at least one distributed DC voltage with a level below that of the central converter, each of the distributed converters (43a-43g) having an AC side electrically connected to the secondary winding circuit of the corresponding one of the transformers (42a-42g), each of the distributed converters (43a-43g) having a DC side electrically connected to the central DC output of the corresponding switch in series; and a first controller connected to the at least one switch, so that the actuator of electrical connection between the pole terminal and the plurality of throw terminals (T1-T5) of the respective one of the at least one switches (41a-41g) is controlled so as to supply a combination of the central DC voltage and the distributed DC voltage as a charging voltage for the battery of the corresponding electric vehicle. a plurality of central converters (40a-40d), each of the plurality of central converters (40a-40d) having an AC input electrically connectable to an external AC power supply, each of the plurality of central converters (40a-40d) having a DC output, and the DC outputs of the plurality of central converters (40a-40d) being serially connected; at least one switch, each of the switches (41a-41g) having a plurality of throw terminals (T1-T5) being respectively electrically connected to terminals of the DC outputs of the plurality of central converters (40a-40d), each of the switches (41a-41g) having two pole terminals (P1, P2), characterized in that each of the switches (41a-41g) having an actuator for switching between electrical connection of one of the pole terminals (P1, P2) and one of the plurality of throw terminals (T1-T5) and that of the one of the pole terminals (P1, P2) and another of the plurality of throw terminals (T1-T5) so as to selectively supplying a voltage at a central DC output between the two pole terminals (P1, P2) as a central DC voltage; at least one transformer, each of the transformers (42a-42g) having a primary winding circuit and a secondary winding circuit, and the primary winding circuit being electrically connected to the external AC power supply; at least one distributed converter for supplying at least one distributed DC voltage with a level below that of the central converter, each of the distributed converters (43a-43g) having an AC side electrically connected to the secondary winding circuit of the corresponding one of the transformers (42a-42g), each of the distributed converters (43a-43g) having a DC side electrically connected to the central DC output of the corresponding switch in series; and a first controller connected to the at least one switch, so that the actuator of electrical connection between the pole terminal and the plurality of throw terminals (T1-T5) of the respective one of the at least one switches (41a-41g) is controlled so as to supply a combination of the central DC voltage and the distributed DC voltage as a charging voltage for the battery of the corresponding electric vehicle.