The invention relates to a charging system for DC charging of the traction battery of an electrically powered motor vehicle, comprising a stationary charging station, which is connected to a three-phase AC voltage or a three-phase alternating current supply network, an AC/DC converter being provided for each of the three phases, characterised according to the invention in that the AC/DC converter for one of the three phases is designed as part of a portable module which can be removed from the charging station, which module is provided with a housing which can be separated from the charging station and in which further electronic components are provided which supplement this to provide an autonomous, single-phase charger.