Multi-distributor charging system

Abstract

The embodiment of the invention provides a charging system. The charging system includes a plurality of first distributors for charging a power storage device, and a plurality of voltage converters for connecting an AC power source to the plurality of distributors. The rated power of each first divider is higher than the rated power of each voltage converter, and the total rated power of the first dividers is higher than the total rated power of the voltage converters. The charging system further includes a plurality of busbars for connecting the first distributors to the voltage converter, where each first distributor has a dedicated first busbar connected to and extending from the first distributor, and each voltage converter has a dedicated second bus bar connected to and extending from the voltage converter, where at least some of the second bus bars are interconnected to form a third bus bar. The plurality of first busbars are permanently disconnected from and non-connectable to the plurality of second busbars.

Description

TECHNICAL FIELD

[0001] The present disclosure relates generally to the field of charging systems. More specifically, the present disclosure relates to a multi-distributor charging system. BACKGROUND

[0002] The number of electric vehicles is rapidly growing worldwide. With the growing number of electric vehicles, the demand for charging systems is also growing. Charging systems typically use AC / DC converters to convert the AC voltage provided by the power network into a DC voltage. The AC / DC converters are a component of the charging system and these AC / DC converters are an expensive part of the charging system.

[0003] In a charging system, the required charging power varies from vehicle to vehicle, especially due to different battery sizes and voltages, but also due to different state of charge SoC. In a system with N charging distributors, it is unlikely that all distributors are used at their full rated power at the same time. In Figure 1 A modular configurable charging system is illustrated in Fig. 1. The modular configurable charging system comprises M voltage converters 201a-201m and N N distributors 203a-203n, wherein the total rated power of the voltage converters 201a-201m is lower than the total rated power of the distributors 203a-203n. These modules are flexibly connectable to the distributors via a reconfiguration switch or matrix switch 202. Typically, to reach the full rated power of a distributor, several voltage converters need to be connected to the distributor. For example, if the power of a converter module is 100 KW and if the full rated power of a distributor module is 1 MW, then ten (10) voltage converters need to be connected to the distributor. Therefore, when the number of distributors grows, the number of converters that need to be connected to the distributors also grows.

[0004] To efficiently utilize the voltage converters, these voltage converters can be used for both fast charging FC and overnight charging ONC. FC is mainly needed during the day, with a peak around noon. ONC is mainly needed during the night, with a peak around 3 AM. Figure 2 A multi-distributor charging system 200 with FC distributors and ONC distributors is illustrated in Fig. 2. The voltage converters 201a-201m are flexibly connectable to both FC distributors 203a-203n and ONC distributors 204a-204n.

[0005] The reconfiguration switch 202 acts as a bridge between the voltage converters 201a-201m and the distributors 203a-203n. Further, the reconfiguration switch 202 corresponds to a number of bus bars from the voltage converters and a number of bus bars to the distributors. M N FC + N ​ONC a matrix of busbars. In a fully populated switch matrix, there is a switch at every crosspoint of the busbars, allowing to disconnect or connect a busbar.

[0006] A fully populated matrix switch provides the most flexibility, but it requires a large number of switches. In case the electric vehicle, EV, charging system belongs to IT protection class 3, both the positive DC (i.e. DC+) busbar and the negative DC (i.e. DC-) busbar require a switch. This doubles the number of switches compared to a charging system that is grounded with one busbar (e.g. the DC- busbar). Further, the cost of a switch in a facility can be significant. When there is a larger number of voltage converters 201a-201m, there is a larger number of busbars extending from these voltage converters 201a-201m. SUMMARY

[0007] It is therefore an object of the present disclosure to provide a charging system that seeks to alleviate, mitigate or eliminate all or at least some of the above-mentioned drawbacks of the currently known solutions.

[0008] This object and other objects are achieved by a charging system as defined in the appended claims. The term "exemplary" is to be understood in the context as used herein as an example, instance, or illustration.

[0009] According to a first aspect of the present disclosure, a charging system is provided. The charging system comprises a plurality of first distributors for charging electric power storage devices; and a plurality of voltage converters for connecting an AC power source to the plurality of distributors. The rated power of each first distributor is higher than the rated power of each voltage converter, and the total rated power of the first distributors is higher than the total rated power of the voltage converters. The charging system further comprises a plurality of busbars for connecting the first distributors to the voltage converters, wherein each first distributor has a dedicated first busbar connected to and extending from the first distributor, and each voltage converter has a dedicated second busbar connected to and extending from the voltage converter, wherein at least some of the second busbars are interconnected to form a third busbar, and wherein electrical switches are provided between the first busbars and the second busbars and between the first busbars and the third busbar to enable the first busbars to be connected and disconnected from the second busbars and to enable the first busbars to be connected and disconnected from the third busbar, wherein the electrical switches are arranged such that each first distributor is connectable to at least a certain number of voltage converters such that the first distributor will be able to deliver its rated power when connected to these voltage converters. The plurality of first busbars are permanently disconnected and non- connectable to the plurality of second busbars.

[0010] In some embodiments, each first distributor of a predetermined set of first distributors can be connectable to a respective set of dedicated voltage converters that, when connected to the distributor, will be able to deliver the rated power from the distributor, and wherein, for at least one first distributor, the remaining converters that do not belong to one of the sets of distributors dedicated converters have a total rated power lower than the rated power of the first distributor, the at least one first distributor being connectable to at least one voltage converter belonging to at least one of said dedicated sets through a connection between the first busbar and the second busbar or between the first busbar and the third busbar, to enable the delivery of the rated power from the first distributor when connected to any remaining voltage converter that does not belong to such dedicated set and to at least one voltage converter belonging to at least one of said dedicated sets.

[0011] In some embodiments, for said at least one first distributor, the remaining converters that do not belong to one of the sets of distributors dedicated converters have a total rated power lower than the rated electric power of the first distributor, the at least one first distributor being connectable to at least one voltage converter in each of said dedicated sets through a connection between the first busbar and the second busbar or between the first busbar and the third busbar, to enable the delivery of the rated power from the first distributor when connected to any remaining voltage converter that does not belong to such dedicated set and to at least one voltage converter belonging to at least one of said dedicated sets.

[0012] In some embodiments, for said at least one first distributor, the remaining converters that do not belong to one of the sets of distributors dedicated converters have a total rated power lower than the rated electric power of the first distributor, the at least one first distributor being connectable to at least one voltage converter in each of said dedicated sets through a connection between the first busbar and the second busbar or between the first busbar and the third busbar, to enable the delivery of the rated power from the first distributor when connected to any remaining voltage converter that does not belong to such dedicated set and to at least one voltage converter belonging to at least one of said dedicated sets.

[0013] In some embodiments, at least one first distributor is connectable to at least a number of voltage converters through a connection between the first busbar and the second busbar or between the first busbar and the third busbar to enable the delivery of its rated power when connected to these voltage converters, and said at least one first distributor is also connectable to at least one further voltage converter.

[0014] In some embodiments, each first distributor is connectable to at least a number of voltage converters through a connection between the first busbar and the second busbar or between the first busbar and the third busbar such that, when the first distributor is connected to these voltage converters, the first distributor will be able to deliver its rated power, and each first distributor is further connectable to at least one additional voltage converter.

[0015] In some embodiments, the charging system further comprises at least one second distributor having a rated power equal to or lower than the rated power of each voltage converter, wherein said second distributor has a dedicated first busbar connected to and extending from the second distributor, and wherein an electrical switch is provided between said first busbar of said second distributor and a second busbar to enable connection and disconnection of said first busbar to the second busbar, wherein said electrical switch is arranged such that the second distributor is connectable to at least one voltage converter, but not to all voltage converters, through a connection between the first busbar and the second busbar or between the first busbar and the third busbar.

[0016] In some embodiments, said at least one second distributor is connectable to at least one voltage converter in each of said dedicated groups of voltage converters through a connection between the first busbar and the second busbar or between the first busbar and the third busbar.

[0017] In some embodiments, the electrical power storage device is a battery of a vehicle.

[0018] The charging system preferably comprises a control unit configured to control the operation of the switches and configured to decide which converters to connect to which distributor. The control unit is provided with software configured to make said decision based on the order in which the distributors start operating for charging, the power required by the distributors in the respective operation, and the rated power of the distributors in the respective operation. Different priority considerations can be applied to enable simultaneous and efficient charging by using multiple or all of the distributors. The software of the control unit is configured to perform such priority considerations by controlling the individual switches of the charging system accordingly. BRIEF DESCRIPTION OF DRAWINGS

[0019] The foregoing will be apparent from the following more particular description of example embodiments, as illustrated in the accompanying drawings in which like reference numbers refer to like parts throughout the different drawings. The drawings are not necessarily to scale, emphasis instead being placed upon illustrating example embodiments.

[0020] Figure 1 An example charging system is illustrated;

[0021] Figure 2 FIG. illustrates an example charging system including a set of first distributors and a set of second distributors, according to some embodiments; Figure 3 FIG. illustrates an example topology of interconnecting multiple busbars, according to some embodiments; and FIG. 4 illustrates an example switch matrix for a multi-distributor charging system with a minimum number of electrical switches, according to some embodiments. DETAILED DESCRIPTION

[0022] Aspects of the present disclosure will be described more fully hereinafter with reference to the accompanying drawings. The disclosure may, however, be embodied in many different forms and should not be construed as limited to the aspects set forth herein. Like reference numerals in the drawings refer to like elements throughout.

[0023] The terminology used herein is for the purpose of describing particular aspects of the disclosure and is not intended to be limiting of the disclosure. It should be emphasized that the terms "comprises / comprising" when used in this specification, is taken to specify the presence of stated features, integers, steps or components, but does not preclude the presence or addition of one or more other features, integers, steps, components, or groups thereof. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0024] Aspects of the present disclosure will be described more fully hereinafter with reference to the accompanying drawings. The disclosure may, however, be embodied in many different forms and should not be construed as limited to the aspects set forth herein. Like reference numerals in the drawings refer to like elements throughout.

[0025] It should be understood that when the disclosure is described in terms of methods, the disclosure can also be embodied in one or more processors and one or more memories coupled to the one or more processors, wherein the one or more memories store one or more programs that, when executed by the one or more processors, perform the steps, services and functions disclosed herein.

[0026] In the following description of the example embodiments, like reference numbers refer to like or similar components.

[0027] Electric vehicles, EVs, require charging stations that handle different battery capacities and have enough space and energy capacity for multiple charging distributors to connect many EVs and charge them simultaneously. In Figure 2In particular, a multi-distributor charging system 200 is shown, within which the teachings of the present disclosure can be implemented. The multi-distributor charging system 200 includes a power grid that delivers high voltage in three phases. The power grid feeds a step-down transformer to reduce the three-phase voltage to a desired AC voltage, and the step-down transformer supplies power to a plurality of AC / DC voltage converters 201a-201m, which in turn supply their outputs to a plurality of first distributors 203a-203n and a plurality of second distributors 204a-204n. In some examples, the plurality of first distributors 203 includes fast chargers, and the plurality of second distributors includes overnight chargers. Finally, the first distributors 203a-203n and the second distributors 204a-204n provide connectors or charging cables 210a-210c and 220a-220c, respectively, for the first distributors 203a-203n and the second distributors 204a-204n to charge EVs.

[0028] The charging system 200 includes M voltage converters and N distributors, where the total rated power of the distributors is higher than the total rated power of the voltage converters. The voltage converters are flexibly connectable to the distributors via reconfiguration switches or matrix switches. The voltage converters are flexibly connectable to the distributors via reconfiguration switches or matrix switches. Typically, to reach the full rated power of the distributors, several voltage converters need to be connected to the distributors.

[0029] For example, if the power of a converter module is 100 KW, and if the full rated power of a distributor module is 1 MW, then ten (10) voltage converters need to be connected to the distributor, and there are more numbers of busbars extending from these voltage converters 201a-201m when there are more numbers of voltage converters 201a-201m.

[0030] According to embodiments of the present disclosure, to minimize the number of busbars, a charging system 200 is provided. The charging system 200 includes a plurality of first distributors 203a-203n for charging power storage devices and a plurality of voltage converters 201a-201m for connecting a power source to the plurality of first distributors 203a-203n. The rated power of each first distributor 203a-203n is higher than the rated power of the voltage converters 201a-201m, and the total rated power of the first distributors 203a-203n is higher than the total rated power of the voltage converters 201a-201m. The charging system 200 further includes a plurality of busbar strips for connecting the first distributors 203a-203n to the voltage converters 201a-201m, wherein each first distributor 203a has a dedicated first busbar strip connected to and extending from the first distributor 203a, and each voltage converter has a dedicated second busbar strip connected to and extending from the voltage converter. Electrical switches are provided between the first busbar strips and the second busbar strips and between the first busbar strips and third busbar strips to enable the first busbar strips to be connected and disconnected from the second busbar strips and the third busbar strips. The electrical switches are arranged such that each first distributor is connectable to at least a certain number of voltage converters such that when the first distributor is connected to the voltage converters, the first distributor will be able to deliver its rated power, and the plurality of first busbar strips are permanently disconnected from and not connectable to the plurality of second busbar strips.

[0031] In conjunction Figure 3 Various embodiments are described for minimizing the number of busbar strips.

[0032] Figure 3 An example topology of interconnecting a plurality of busbar strips is illustrated according to some embodiments.

[0033] In some embodiments, the number of busbar strips extending from the voltage converters 201a-201m is reduced. For example, one or more busbar strips extending from a voltage converter are interconnected to reduce the number of busbar strips.

[0034] The number of busbar strips is reduced based on a binary number system. For example, a 3-bit binary number 101 represents ‘5’ in a decimal number system. In general, a 3-bit binary number x 2 x 1 x 0 (the numbers x 2, x 1 and x 0) are equal to .

[0035] Furthermore, in general,N Bit binary number x N x N-1 … x 0 equals .

[0036] Therefore, using N A digit, which can be represented as 0 to 2. N -1. Therefore, using the proposed system, 2 N Each mother line can be connected in parallel to have 2 i The number of mother lines is reduced to a group. N Mother lines.

[0037] like Figure 3 The depicted configuration includes two sets of converters: set 1 with seven voltage converters and set 2 with seven voltage converters. Further, there are distributors 203a-203m serving as fast-charging distributors and distributors 204a-204m serving as nighttime distributors. Each first distributor has a dedicated first busbar connected to and extending from it. For example, distributor 203a has a first busbar 4.1, and similarly, distributor 203b has a first busbar 4.2, distributor 203c has a first busbar 4.3, and distributor 203d has a first busbar 4.3. Each first distributor 203a-203n can be connected to at least a number of voltage converters such that when the first distributor is connected to these voltage converters, it will be able to deliver its rated power.

[0038] Voltage converters 1 to 7 in group 1 have corresponding second buses 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, and 1.7. The seven voltage converters in group 2 have corresponding second buses 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, and 2.7. Therefore, each voltage converter has a dedicated bus (i.e., 1.1 to 1.7 in group 1 and 2.1 to 2.7 in group 2) connected to and extending from that voltage converter.

[0039] In some embodiments, at least some of the second busbars are interconnected to form a third busbar. In the example above, some of the second busbars (i.e., busbars 1.1 and 1.2, and 1.3 and 1.4, 1.5 and 1.6) are interconnected.

[0040] Second mother lines 1.1 to 1.4 are interconnected to form third mother line 5.2, and second mother lines 1.5 and 1.6 are interconnected to form third mother line 5.1, and second mother line 1.7 represents third mother line 5.0 because no interconnection is required. Therefore, at least some of the second mother lines are interconnected to form third mother lines, which reduces the number of mother lines, i.e., in this example, seven (7) mother lines 1.1 to 1.7 are reduced to three (3) mother lines.

[0041] Similarly, such as Figure 3 As shown, the dedicated second busbars 2.1 to 2.7 of the voltage converter in group 2 are interconnected to form a third busbar.

[0042] In some embodiments, an electrical switch is provided between the first busbar and the second busbar, and between the first busbar and the third busbar, so that the first busbar can be connected to and disconnected from the second busbar, and the first busbar can be connected to and disconnected from the third busbar.

[0043] like Figure 3 As depicted, an electrical switch is installed between the first parent lines 4.1, 4.2, 4.3, 4.4 and the second parent lines 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, and 3.7. An electrical switch is also installed between the first parent lines 4.1, 4.2, 4.3, 4.4 and the third parent lines 5.1, 5.2, and 5.3.

[0044] In some embodiments, the electrical switches disposed between the first busbar and the second busbar, and between the first busbar and the third busbar, represent matrix switches. Therefore, matrix switches are disposed between the third busbars 5.1, 5.2, and 5.3 and the first distributor buses 4.1, 4.2, 4.3, 4.4, and 4.5. Thus, each FC distributor busbar 203a-203n can be connected to a complete set of third buses 5.1, 5.2, and 5.3. FC distributor busbar 4.1 can be connected to a set of third buses 5.1, 5.2, and 5.3, and distributor busbar 4.2 can be connected to a set of third buses from group 2.

[0045] It should be noted that the number of third buses is less than the number of second buses (i.e., input buses) extending from the voltage converter. This reduces the size of the switching matrix between the third bus and the FC distributor bus compared to the size of the switching matrix between the second bus and the FC distributor bus.

[0046] In some embodiments, the plurality of first busbars are permanently disconnected from the plurality of second busbars and cannot be connected to the plurality of second busbars in order to reduce the size of the switch matrix.

[0047] Thus, it should be noted that the FC distributor bus 4.1 can be connected to a set of third bus bars 5.1, 5.2 and 5.3 and the distributor bus 4.2 can be connected to a set of third bus bars from group 2. Each additional FC distributor bus bar 4.3 and 4.4 can be connected to two complete third bus bar buses in group 1 and group 2.

[0048] In some embodiments, the second distributors 204a-204n (i.e. night-time charging distributors) can be connected to voltage converters, as shown in Figure 3 In the example shown in Figure 3 , the parallel connection of voltage converters with the second distributors 204a-204n is not necessary. In this case, the switch matrix can be filled, for example, in a diagonal manner, as shown in Figure 3 To reduce the number of buses, it is necessary to interconnect the second bus bars by means of switches (6) instead of providing permanent connections. If power is supplied to the distributors 204a-204n, the switches (6) must be opened. If power is supplied to the first distributors 203a-203n, the switches (6) must be closed.

[0049] Figure 3 The example shown can be applied to a plurality of voltage converters. For example, when it is necessary to connect up to 3 voltage converters in parallel to the second distributors 204a, a bus reduction (7') similar to the bus reduction (7) can be inserted before the switch matrix. The bus reduction (7') requires only two levels, instead of three, as in the bus reduction (7).

[0050] In another example, if it is necessary to connect up to 15 voltage converters in parallel to the first distributors 203a, a four-level (instead of three-level) bus reduction will be performed.

[0051] In another example, if the maximum number of voltage converters to be connected in parallel is not a power of 2, i.e. (2 n -1), the next higher power of 2 will be chosen to determine the number of levels of the bus reduction. For example, if it is necessary to connect up to 10 voltage converters in parallel, a four-level bus reduction is performed. For example, if the rated power of each FC distributor is known to be 1 MW, a power of each module of about 150 kW would be advantageous, as this results in the connection of 2 3 -1 = 7 voltage converters in parallel. A power of each module of 125 kW can not be optimal, as it requires the connection of 8 voltage converters and thus one more level.

[0052] After performing bus reduction, the number of electrical switches required to connect the first bus bar and the second bus bar can be minimized, enabling the first bus bar to be connected and disconnected from the second bus bar and the first bus bar to be connected and disconnected from the third bus bar.

[0053] FIG. 4 illustrates an example switch matrix with a minimum number of electrical switches for a multi-distributor charging system, according to some embodiments.

[0054] It is considered that the fast charging distributor 203a has a rated power of 1 MW, and the voltage converter 201 has a rated power of 67 kW. Therefore, 15 voltage converters will be connected in parallel to the FC distributor 203a to achieve full power. The charging system 200 includes 5 FC distributors, and the voltage converter 201 is installed to 3 FC distributors of the operating 5 FC distributors. Therefore, 45 voltage converters will be used to achieve 3 MW of power.

[0055] As depicted in FIG. 4, each group corresponds to 15 voltage converters. Without reducing the number of bus bars, each cell in the matrix corresponds to a column with 15 switches. This results in a total of 9 x 15 = 135 switches without reducing the number of bus bars. In the case of 3-level bus reduction, each cell of the matrix shown in FIG. 4 requires only 4 switches instead of 15, resulting in 9 x 4 = 36 switches.

[0056] In addition, 11 switches are used to reduce each of the voltage converter groups, resulting in a total of 9 x 4 + 3 x 11 = 69 switches. When compared to the total number of switches, which is 135, this is only 51%; that is, 49% of switches are saved.

[0057] Further, with 45 voltage converters, 45 ONC distributors can be charged. With a rated power of 67 kW per voltage converter, it takes 7.5 hours to fully charge a 500 kWh battery. If the number of ONC distributors does not exceed 22, the voltage converters can be connected in parallel in pairs of 134 kW. It should be noted that the number of switches for the FC without reduction is 9 x 7 = 63. The number of switches for the FC with reduction: 9 x 3 + 3 x 4 = 39, which is 62% of the number without reduction, that is, 38% is saved.

[0058] The charging system comprises a control unit configured to control operation of the switches and to decide which of the converters are to be connected to which of the distributors. The control unit is provided with software configured to make said decision based on the order in which the distributors start to operate for charging, the power required by the distributors in the respective operation, and the rated power of the distributors in the respective operation. Different priority considerations can be applied to enable simultaneous and efficient charging by simultaneously using multiple or all of the distributors. The software of the control unit is configured to perform such priority considerations by correspondingly controlling the individual switches of the charging system.

[0059] The foregoing description of specific embodiments will so fully reveal the general nature of the embodiments herein that others can easily modify and / or adjust such embodiments for various applications without departing from the general concept and thus, such modifications and adjustments should and are intended to be understood as falling within the equivalent of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, although the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the scope of the disclosure.

Claims

1. A charging system (200), comprising: - Multiple first distributors (203a-203n) for charging power storage devices, and - Multiple voltage converters (201a-201m) for connecting power to the multiple first distributors (203a-203m), wherein: - The rated power of each first distributor (203a-203n) is higher than the rated power of each voltage converter (201a-201m), and - The total rated power of the first distributors (203a-203n) is higher than the total rated power of the voltage converters (201a-201m), and wherein the charging system (200) further includes a plurality of bus lines for connecting the first distributors (203a-203n) to the voltage converters (201a-201m), wherein each first distributor (203a-203n) has a dedicated first bus line (4.1-4.4) connected to and extending from the first distributor, and each voltage converter has a dedicated first bus line (4.1-4.4) connected to and extending from the voltage converter. A dedicated second busbar, wherein at least some of the second busbars (1.1-1.7 and 2.1-2.7) are interconnected to form a third busbar (5.0, 5.1, and 5.2), and wherein electrical switches are provided between the first busbar (4.1-4.4) and the second busbars (1.1-1.7 and 2.1-2.7) and between the first busbar (4.1-4.4) and the third busbar (5.0, 5.1, and 5.2) to enable the first busbar to connect and disconnect from the second busbar and to connect and disconnect from the third busbar, wherein the electrical switches are configured such that: - Each first distributor (203a-203n) is capable of being connected to at least a number of voltage converters such that when the first distributor (203a) is connected to these voltage converters (201a-201m), the first distributor (203a) will be able to deliver its rated power, and wherein a plurality of first buses are permanently disconnected from a plurality of second buses (1.1-1.7 and 2.1-2.7) and cannot be connected to the plurality of second buses.

2. The charging system (200) according to claim 1, wherein, Each of a predetermined set of first distributors (203a-203j) is capable of being connected to a corresponding set of dedicated voltage converters (201a-201j), which, when connected to the distributor, will be able to deliver rated power from the distributor, and wherein, for at least one first distributor (203k-203n), the remaining converters (201k-201m) not belonging to one of the dedicated groups of the distributors in this set of distributors have a total rated power lower than the rated power of the first distributor 203a, the at least one first distributor (203k-203n) can be connected to at least one voltage converter belonging to at least one of the dedicated groups via the connection between the first bus (4.1-4.4) and the second bus (1.1-1.7 and 2.1-2.7) or the first bus (4.1-4.4) and the third bus (5.0, 5.1 and 5.2) so that the rated power can be delivered from the first distributor when the first distributor is connected to any remaining voltage converter (201) not belonging to such dedicated group and when connected to at least one voltage converter (201) in at least one of the dedicated groups.

3. The charging system (200) according to claim 2, wherein, For the at least one first distributor (203k-203n), the residual voltage converters (201k-201m) that do not belong to one of the dedicated groups of the distributors have a total rated power lower than that of the first distributor (203a). The at least one first distributor (203k-203n) can be connected to at least one voltage converter (201a-201j) in each of the dedicated groups through the connection between the first bus (4.1-4.4) and the second bus (1.1-1.7 and 2.1-2.7) or the first bus (4.1-4.4) and the third bus (5.0, 5.1 and 5.2) so that the rated power can be delivered from the first distributor when the first distributor (203a) is connected to any residual voltage converter (201a-201n) that does not belong to such a dedicated group and to at least one voltage converter (201) connected to at least one dedicated group in the dedicated group.

4. The charging system (200) according to claim 2 or 3, wherein, For the at least one first distributor (203k-203n), the remaining voltage converters (201a-201n) that do not belong to one of the dedicated groups of the distributors have a total rated power lower than that of the first distributor (203a). The at least one first distributor (203k-203n) can be connected to a certain number of voltage converters in each of the dedicated groups through a connection between the first bus (4.1-4.4) and the second bus (1.1-1.7 and 2.1-2.7) or between the first bus (4.1-4.4) and the third bus (5.0, 5.1 and 5.2) so that the rated power can be delivered from the first distributor when the first distributor 203a is connected to any remaining voltage converter that does not belong to such a dedicated group and to any voltage converter connected to any dedicated group in the dedicated group.

5. The charging system (200) according to any one of claims 1 to 4, wherein, At least one first distributor (203a-203n) is connected to at least a number of voltage converters (201) via a connection between a first busbar (4.1-4.4) and a second busbar (1.1-1.7 and 2.1-2.7) or between a first busbar (4.1-4.4) and a third busbar (5.0, 5.1 and 5.2) such that when the first distributor (203a) is connected to these voltage converters, the first distributor will be able to deliver its rated power, and the at least one first distributor is also able to be connected to at least one additional voltage converter.

6. The charging system (200) according to any one of claims 1 to 5, wherein, Each first distributor (203a-203n) can be connected to at least a number of voltage converters (201) via a connection between a first busbar (4.1-4.4) and a second busbar (1.1-1.7 and 2.1-2.7) or between a first busbar (4.1-4.4) and a third busbar (5.0, 5.1 and 5.2) such that when the first distributor is connected to these voltage converters (201), the first distributor (203a-203n) will be able to deliver its rated power, and each first distributor can also be connected to at least one additional voltage converter.

7. The charging system (200) according to any one of claims 1 to 6, comprising at least one second distributor (204a-204n), said at least one second distributor having a rated power equal to or lower than the rated power of each voltage converter, wherein, The second distributor (204a) has a dedicated first busbar (3.1-3.7) connected to and extending from the second distributor, and wherein an electrical switch is provided between the first busbar and the second busbar of the second distributor to enable the first busbar to be connected to and disconnected from the second busbar (204a), wherein the electrical switch is configured to enable the second distributor (204a) to be connected to at least one voltage converter (201) via the connection between the first busbar (3.1-3.7) and the second busbar (1.1-1.7 and 2.1-2.7) or between the first busbar (3.1-3.7) and the third busbar (5.0, 5.1 and 5.2), but not to all voltage converters (201).

8. The charging system (200) according to claim 7, wherein, The at least one second distributor (204a-204n) can be connected to at least one voltage converter in each of the dedicated groups having a voltage converter (201) via a connection between the first bus (3.1-3.7) and the second bus (1.1-1.7 and 2.1-2.7) or between the first bus (3.1-3.7) and the third bus (5.0, 5.1 and 5.2).

9. The charging system (200) according to any one of claims 1 to 8, wherein, The power storage device is the vehicle's battery.

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