Charging system with galvanic isolation and multiple operating modes

A method for charging a DC energy source from an AC energy source using a charging system configured for a plurality of operating modes, the charging system including an isolation module providing galvanic isolation between the DC energy source and the AC energy source, wherein each operating mode of the plurality of operating modes corresponds to a respective turns ratio for the isolation module, the DC energy source having a DC voltage and the AC energy source having an AC voltage, the method comprising:

• identifying a first operating mode of the plurality of operating modes based on the DC voltage and the AC voltage;
• configuring the isolation module for a first turns ratio associated with the first operating mode in response to identifying the first operating mode;
• and
• operating the charging system in accordance with the first operating mode.

A vehicle charging system comprising:

• a DC interface;
• an AC interface;
• a first conversion module coupled to the DC interface;
• a second conversion module coupled to the AC interface;
• an isolation module coupled between the first conversion module and the second conversion module, the isolation module comprising:
• a transformer;
• and
• a switching element coupled between the transformer and the second conversion module, wherein the transformer and the switching element are cooperatively configured to for a plurality of operating modes, each operating mode of the plurality of operating modes corresponding to a respective turns ratio of the transformer.