Patent ID: 8350523

Claim:
A charging system comprising: a first conversion module; a second conversion module; an inductor connected between the second conversion module and a first node of an interface for an AC voltage; and an isolation module coupled between the first conversion module and the second conversion module, the isolation module providing galvanic isolation between the first conversion module and the second conversion module, wherein: the isolation module is configured for a plurality of operating modes, each operating mode of the plurality of operating modes corresponding to a respective turns ratio for the isolation module; the isolation module comprises: a first node coupled to the first conversion module; a second node coupled to the first conversion module; a first set of windings coupled between the first node and the second node; a second set of windings coupled between the first node and the second node, the first set of windings and the second set of windings being configured electrically in parallel; a third node coupled to the second conversion module; a fourth node coupled to the second conversion module; a fifth node; a third set of windings coupled between the third node and the fifth node; a fourth set of windings coupled between the fourth node and the fifth node; and a switching element coupled between the fifth node and a sixth node of the second conversion module, the isolation module having a first turns ratio corresponding to a first operating mode when the switching element is open and a second turns ratio corresponding to a second operating mode of the plurality of operating modes when the switching element is closed; the second conversion module comprises: a seventh node; a first set of switches coupled between the third node and the sixth node; a second set of switches coupled between the fourth node and the sixth node; a third set of switches coupled between the third node and the seventh node; and a fourth set of switches coupled between the fourth node and the seventh node; the inductor is connected between the seventh node and the first node of the interface; and a second node of the interface is coupled to the sixth node, the interface having the AC voltage between the first node of the interface and the second node of the interface.