Charging circuit for a vehicle-side electrical energy store

1. A charging circuit for a vehicle-side electrical energy store, the charging circuit comprising:

an alternating current terminal;

at least two smoothing capacitors;

a configuration device; and

a rectifier via which the alternating current terminal is connected to the configuration device;

wherein the configuration device connects the rectifier to the at least two smoothing capacitors, and is configured to connect the smoothing capacitors to one another in a first parallel arrangement and a second series arrangement;

wherein the alternating current terminal comprises a neutral conductor terminal connected via a diode circuit to the configuration device.

2. The charging circuit as claimed in claim 1 , wherein the diode circuit comprises a rectifier circuit with an alternating current side connected to the neutral conductor terminal and a direct current side connected to the configuration device.

3. The charging circuit as claimed in claim 1 , wherein:

the diode circuit comprises at least two diodes;

a first diode of the at least two diodes connects the neutral conductor terminal to one of the smoothing capacitors; and

a second diode connects the neutral conductor terminal to a different one of the smoothing capacitors.

4. The charging circuit as claimed in claim 1 , wherein the configuration device comprises:

a first switch with a closed position connecting the at least two smoothing capacitors to one another in parallel; and

a second switch with a closed position connecting the at least two smoothing capacitors to one another in series.

5. The charging circuit as claimed in claim 4 , wherein:

the configuration device comprises two first switches; and

the second switch is connected to the two first switches in a series circuit connected to different potentials of the rectifier; and

the two first switches are connected to one another within the series circuit via the second switch.

6. The charging circuit as claimed in claim 1 , further comprising an additional diode circuit connecting the neutral conductor terminal to different potentials of the rectifier.

7. The charging circuit as claimed in claim 1 , further comprising a control apparatus connected to the configuration device;

wherein the configuration device is fitted with switches; and

the control apparatus is designed to:

(i) in a parallel configuration state, close only the switch or switches of the configuration device via which the two smoothing capacitors are each connected between two different potentials of the rectifier; and

(ii) in a series configuration state, close only the switch or switches of the configuration device that connect the two smoothing capacitors in series.

8. The charging circuit as claimed in claim 7 , wherein the control apparatus is programmed to:

ascertain a single-phase and a polyphase occupancy state of the alternating current terminal;

ascertain a single-phase as well as a polyphase usage state of the rectifier; or

acquire a signal that indicates a single-phase or polyphase desired state of the charging circuit;

wherein the control apparatus connects the two smoothing capacitors to one another in a parallel configuration in the single-phase states and connects them to one another in a series configuration in the polyphase states.

9. The charging circuit as claimed in claim 1 , wherein further comprising a plurality of direct voltage converters, each comprising a clocked switching unit and an intermediate circuit capacitor;

wherein the intermediate circuit capacitor of a first of the plurality of direct voltage converters includes a first of the two smoothing capacitors; and

the intermediate circuit capacitor of a second of the plurality of direct voltage converters includes a second of the smoothing capacitors.

10. The charging circuit as claimed in claim 9 , wherein:

each of the plurality of direct voltage converters comprises terminals connected to a direct current terminal for connection of the energy store;

the terminals of each of the plurality of direct voltage converters are connected to one another in parallel.

11. The charging circuit as claimed in claim 1 , wherein:

the rectifier comprises a controllable rectifier with a controllable rectifier unit connected directly to the alternating current terminal; or

the rectifier comprises a power factor correction filter with a controllable rectifier unit connected via inductors to the alternating current terminal.