The present invention proposes a charging system circuit for charging an energy storage in a vehicle comprising a transformer having DC-isolated transformer outputs from each other, a first subsystem connected to one of the transformer outputs, Wherein each of the first subsystem and the second subsystem includes a rectifier connected upstream of the DC-DC converter, the DC-DC converter having a changeover unit on its input side or on its output side, logic unit. In particular, the first subsystem is coupled to the delta circuit in the transformer output, and the second subsystem is coupled to the star circuit in the transformer output.
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