Patent ID: 7893666

Claim:
A device for charging an electrical energy storage device using a charging current, the electrical energy storage device being connected, via a main current path, to an electrical power source, which provides a supply current, the device comprising: a switched voltage transformer device that: is situated in the main current path; is adapted for raising a first electric potential of the electrical energy storage device over an electrical supply potential of the electrical power source; has a switching element; is adapted for being deactivated during a precharging phase by disabling the switching element; and is adapted for being activated during a step-up transforming phase by switching the switching element; and an active current-limiting device that: is adapted for limiting the supply current to a predefined maximum current; is situated in the main current path upstream from the switched voltage transformer device; and has a controllable current source that is situated in the main current path and that is controlled by a control unit the supply current and regulating a current flow of the supply current through the controllable current source to the predefined maximum current.