Patent ID: 12187144

DETAILED DESCRIPTION

FIG.1shows a schematic view of a block diagram of a charging device for charging an electric energy accumulator5according to one embodiment. The charging device can be powered by a single-phase or multi-phase AC electric voltage source3. For example, this can be a single or multi-phase connection to an electrical power system, for example a low-voltage system. The single-phase or multi-phase electrical power source3is initially connected to a filter means1. For example, this filter means1can eliminate or at least reduce interfering signals, in particular high-frequency interfering signals. For example, such interfering signals can be caused by the charging circuit4, which converts the single-phase or multi-phase AC voltage supplied by the AC electric voltage source3into a DC voltage to charge the electric energy accumulator5.

The charging device further comprises a switching means2, which can couple one or more electrical phases of the electric alternating voltage source3to the charging circuit4. If, for example, only a single-phase AC voltage is supplied by the AC electric voltage source3, the switching means2can only couple this one live phase to the charging circuit4. In this case, a live phase L1, L2, or L3can be provided on a plurality of phase connectors of a multi-phase charging circuit. If the charging circuit comprises a plurality of single-phase charging circuits (as explained below) the live phase can also be provided on a plurality of single-phase charging circuits in case of a single-phase power supply.

If an electric alternating voltage, for example a three-phase alternating voltage, is supplied from the electric alternating voltage source3to two or more phases, then the switching means2can couple all live phases to corresponding connections of the charging circuit4.

While in conventional charging devices the filter means is typically provided electrically between the switching means2and the charging circuit4, it is a special feature of this embodiment that the filter means1is provided between the electrical alternating voltage source3and the switching means2.

FIG.2shows a schematic block diagram of a charging device according to a further embodiment. The charging device according to the embodiment ofFIG.2largely corresponds to the previously described embodiment and differs in particular in that a separate charging circuit4-iis provided for each electrical phase.

FIG.3shows a schematic block diagram of a charging device according to a further embodiment. The charging device according to the embodiment ofFIG.3largely corresponds to the previously described embodiments and differs in particular in that a separate filter means2-iis provided for each electrical phase. In this case, in each of the individual filter means2-i, each of the filter components can be provided for an electrical phase.

FIG.4shows a schematic diagram of a schematic of a charging device for charging an electrical energy accumulator5according to one embodiment. The number of maximum three electrical phases L1, L2, and L3shown herein is merely for the purpose of better understanding and does not constitute a limitation of the present invention here or in the other exemplary embodiments. The charging device can optionally include other components in addition to the components shown herein, such as breakers or overcurrent/surge protection elements. These are not shown in the schematic diagram shown in this case, for ease of understanding.

Similar to the embodiments described above, a single-phase or multi-phase AC electric voltage can be provided from an AC electric voltage source3. This AC voltage can be supplied on an input connection11. In addition to the live phases L1, L2, and L3, a neutral conductor N and a protective conductor PE can also be connected to the input connection11. A filter means1is provided between the input connection11and the switching means2already described above. For example, this filter means1can eliminate or minimize interfering signals, in particular high frequency interfering signals, caused, for example, by the charging circuit4.

In the embodiment shown inFIG.4, the switching elements in switching means2can be used in order to couple the individual electrical phases L1, L2, and L3to corresponding connections12for connecting the charging circuit, respectively. Alternatively, in the event that a charging voltage is only provided on one phase, for example L1, this single-phase charging voltage can be provided on all phase connections of the charging circuit by corresponding switch positions in the switching means2. In the schematic diagram according toFIG.4, for example, the voltage of the first phase L1can also be additionally provided on the phase connections for L2and L3on the output connection12.

Furthermore, the switching means4can also comprise further switching elements for providing an electrical input connection voltage on a further phase L2or L3on the output connection side on a plurality of phase connections. For example, a single-phase electric voltage on phase L3can also be supplied to L1and/or L2, or an electric voltage on L2can additionally also be supplied to L1and/or L3,

The filter means1can comprise, for example, a serial circuit consisting of a first capacitor element C1, a first inductive component II, and a second capacitor element C2. The first and/or second capacitor element C1, C2can each comprise so-called Y capacitors and X capacitors. For example, the Y capacitors are each arranged between a phase L1, L2, L3and a reference potential PE. For example, the X capacitors Cx can be provided between two electrical phases L1, L2, L3. The inductive component II can have an appropriate inductance in each phase, for example. If the neutral conductor N is also optionally provided in the charging device, an inductance can also be provided in this neutral conductor N, if applicable.

If the filter means1comprises a plurality of capacitor elements C1, C2, then all of these capacitor elements can be of the same or at least similar design.

Between the filter means1and an output connection12, the switching means2is provided, which can couple the respective active phases with the charging circuit4. For example, an electrical or mechanical switching element S1, S2, S3can be provided for each electrical phase. Alternatively, it is also possible that at least one electrical phase L1is permanently connected to the corresponding phase connection of the output connection12, and only the further electrical phases L2, L3have switching elements S2, S3.

A charging circuit4can be provided on the output connection12, which, for example, converts the supplied single-phase or multi-phase AC electric voltage into a DC voltage that is suitable for recharging an electrical energy accumulator5.

FIG.5shows a schematic diagram of a schematic of a charging device for charging an electrical energy accumulator5according to a further embodiment. The embodiment shown inFIG.4largely corresponds to the embodiment described above and differs in particular from the embodiment described above in that, in the filter means1, a serial circuit is provided consisting of a first capacitor element C1, a first inductive filter element II, a second capacitor element C2, a second inductive filter element12, and a third capacitor element C3. Each of the capacitive and inductive elements C1, C2, C3and II,12can correspond to the elements already described above. Therefore, in this diagram, a detailed representation of the individual capacitors in the capacitor elements C1, C2, C3and the inductive elements II,12is omitted.

In addition, a voltage detector14can optionally also be provided, for example. For example, this voltage detector14can monitor the electrical voltage on the phase connections of the input connection11. If a significant electrical voltage, in particular an electrical voltage higher than a predetermined threshold value, is detected on one of the phase connections, then the switching means2can drive the corresponding switching element S1, S2, S3in order to connect the corresponding electrical phase L1, L2, L3to the respective phase connection of the output connection12. In this way, the circuit configuration can be automatically adjusted according to the voltage ratios applied at the input connection11.

The aforementioned charging device for charging an electrical energy accumulator5can in particular be used in order to charge a traction battery for a fully or at least semi-electrically driven vehicle.

In summary, the present invention relates to the connection of a charging circuit for charging an electrical energy accumulator device by means of a single-phase or multi-phase electrical alternating voltage. For this purpose, a filter means for suppressing interfering signals is provided at an input connection prior to a switchover between a single-phase and a multi-phase charging operation. In this way, the properties, in particular the capacitive properties of the filter means, are not affected by the circuit configuration in the switchover between single-phase and multi-phase charging.