Charging device for an electric car

The circuit has connection units (S1-S3) whose output sides are connected with each other in series or parallel to form an intermediate circuit. The connection units are connected with ports (L1-L3, N) of a supply network. Four valve paths (VP1-VP4) are provided in each connection unit. The valve paths are connected with the ports of the supply network, and comprise rectifying elements (D1-D4, T1-T4). The valve paths are switched parallel to each other or form a rectifier bridge e.g. full steered rectifier bridge or half steered rectifier bridge. An independent claim is also included for a method for controlling a connection of a power unit or a charging unit to an accumulator or a battery with a supply network.