Multi-dispenser charging system

Abstract

Embodiments of the present disclosure provide a charging system. The charging system comprises a plurality of first dispensers for charging electric power to an electric power storage device and a plurality voltage converters for connecting an AC power source to the plurality of dispensers. Each first dispenser has a rated power which is higher than the rated power of each voltage converter and the total rated power of the first dispensers is higher than the total rated power of the voltage converters. The charging system further comprises a plurality of bus bars for connecting the first dispensers to the voltage converters, wherein each first dispenser has a dedicated first bus bar connected to and extending from the first dispenser and each voltage converter has a dedicated second bus bar connected to and extending from the voltage converter, wherein at least some of the second bus bars are interconnected, such as to form third bus bars. A plurality of first bus bars is permanently disconnected from and not connectable to a plurality of second bus bars.

Description

[0001] MULTI-DISPENSER CHARGING SYSTEM

[0002] TECHNICAL FIELD

[0003] The present disclosure generally relates to the field of charging systems. More particularly, it relates to a multi-dispenser charging system.

[0004] BACKGROUND

[0005] The number of electric vehicles across the world is increasing rapidly. With the increase in number of electric vehicles, there is a growing demand for charging systems. The charging systems typically use AC / DC converter for converting an AC voltage provided by a power network to a DC voltage. The AC / DC converters are an integral part of the charging systems and these AC / DC converters are an expensive part of the charging systems.

[0006] In the charging systems, required charging power varies from one vehicle to another vehicle, in particular, due to different battery sizes and voltage, but also due to a different state of charge, SoC. In a system with N charging dispensers, it is unlikely that all dispensers are used at their full rated power at the same time. A modular, configurable charging system is illustrated in Figure 1. The modular configurable charging system comprises M equal voltage converters 201a-201m and N dispensers 203a-203n, where the total rated powerof the voltage converters 201a-201m is lower than that of the dispensers 203a-203n. The modules are flexibly connectable with the dispensers via a reconfiguration switch, or matrix switch 202. In general, to reach the full rated power of a dispenser, several voltage converters need to be connected to the dispenser. For example, if the power of a converter module is 100 KW and if the full rated power of dispenser module is 1 MW, then ten (10) voltage converters need to be connected to the dispenser. Thus, when the number of dispensers increase, the number of converters that need to be connected to the dispensers also increase.

[0007] In order to efficiently utilize the voltage converters, these voltage converters can be used both for fast charging, FC and overnight charging, ONC. The FC is required mainly during the day, peaking around noon. A multi-dispenser charging system 200 with FC dispensers and ONC dispensers is illustrated in FIG. 2. The voltage converters 201a-201m are flexibly connectable to both FC dispensers 203a-203n and ONC dispensers 204a-204n. The reconfiguration switch 202 acts as a bridge between the voltage converters 201a-201m and the dispensers 203a-203n. Further, the reconfiguration switch 202 corresponds to a matrix that includes M bus bars from the voltage converters and the NK+NONC bus bars to the dispensers. In a fully populated switching matrix, there is a switch at every cross-over of buses, allowing to either disconnect or connect the buses.

[0008] The fully populated matrix switch provides maximum flexibility, however it requires a large number of switches. In case of an electric vehicle, EV, charging system which are of the IT protection class 3, the switches are needed both for both the positive DC, i.e., DC+, and negative DC i.e., DC- bus. This doubles the number of switches as compared with the charging system where one bus, e.g., the DC- bus is grounded. Further, the cost of the switches in an installation may be substantial. When there are more number of voltage converters 201a-201m, there are more number of buses that extend from these voltage converters 201a-201m.

[0009] SUMMARY

[0010] It is therefore an object of the present disclosure to provide a charging system that seeks to mitigate, alleviate, or eliminate all or at least some of the above-discussed drawbacks of presently known solutions.

[0011] This and other objects are achieved by means of a charging system as defined in the appended claims. The term exemplary is in the present context to be understood as serving as an instance, example or illustration.

[0012] According to a first aspect of the present disclosure a charging system is provided. The charging system comprises a plurality of first dispensers for charging electric power to an electric power storage device and a plurality voltage converters for connecting an AC power source to the plurality of dispensers. Each first dispenser has a rated power which is higher than the rated power of each voltage converter and the total rated power of the first dispensers is higher than the total rated power of the voltage converters. The charging system further comprises a plurality of bus bars for connecting the first dispensers to the voltage converters, wherein each first dispenser has a dedicated first bus bar connected to and extending from the first dispenser and each voltage converter has a dedicated second bus bar connected to and extending from the voltage converter, wherein at least some of the second bus bars are interconnected, such as to form third bus bars, and wherein electrical switches are provided between first bus bars and second bus bars and between first bus bars and third bus bars for enabling connection and disconnection of a first bus bar to a second bus bar and of a first bus bar to a third bus bar, wherein said electric switches are provided such that: each first dispenser is connectable to at least so many voltage converters that, upon connection of the first dispenser to those voltage converters, the first dispenser will be able of delivering its rated power. A plurality of first bus bars is permanently disconnected from and not connectable to a plurality of second bus bars.

[0013] In some embodiments, each first dispenser of a predetermined group of first dispensers is connectable to a respective dedicated group of voltage converters that will enable delivery of rated power from that dispenser when connected to that dispenser, and wherein at least one first dispenser, for which the remaining converters not belonging to one of the groups dedicated to a dispenser of said group of dispensers have a total rated power which is lower than the rated power of that first dispenser, is connectable to at least one voltage converter belonging to at least one of said dedicated groups, through a connection between a first bus bar and a second bus bar or between a first bar and a third bus bar to enable delivery of the rated power from that first dispenser upon connection thereof to any remaining voltage converter not belonging to such a dedicated group and to at least one voltage converter of at least one of said dedicated groups.

[0014] In some embodiments, said at least one first dispenser, for which the remaining converters not belonging to one of the groups dedicated to a dispenser of said group of dispensers has a total rated power which is lower than the electric rated power of that first dispenser, is connectable to at least one voltage converter of each of said dedicated groups, through a connection between a first bus bar and a second bus bar or between a first bar and a third bus bar to enable delivery of the rated power from that first dispenser upon connection thereof to any remaining voltage converter not belonging to such a dedicated group and to at least one voltage converter of at least one of said dedicated groups.

[0015] In some embodiments, said at least one first dispenser, for which the remaining converters not belonging to one of the groups dedicated to a dispenser of said group of dispensers has a total rated power which is lower than the electric rated power of that first dispenser, is connectable to so many voltage converters of each of said dedicated groups, through a connection between a first bus bar (4.1-4.4) and a second bus bar (1.1- 1.7 and 2.1-2.7) or between a first bar (4.1-4.4) and a third bus bar (5.0, 5.1 and 5.2), that delivery of the rated power from that first dispenser upon connection thereof to any remaining voltage converter not belonging to such a dedicated group and to any voltage converter of any of said dedicated groups is enabled.

[0016] In some embodiments, at least one first dispenser is connectable to at least so many voltage converters that, through a connection between a first bus bar and a second bus bar or between a first bar and a third bus bar, upon connection of the first dispenser to those voltage converters, the first dispenser will be able of delivering its rated power, and that said at least one first dispenser is also connectable to at least one further voltageconverter.

[0017] In some embodiments, each first dispenser is connectable to at least so many voltage converters through a connection between a first bus bar and a second bus bar or between a first bar and a third bus bar, upon connection of the first dispenser to those voltage converters, the first dispenser will be able of delivering its rated power, and that each first dispenser is also connectable to at least one further voltage-converter.

[0018] In some embodiments, the charging system further comprising at least one second dispenser, which has a rated power which is equal to or lower than the rated power of each voltage converter, wherein said second dispenser has a dedicated first bus bar connected to and extending from the second dispenser, and wherein electrical switches are provided between said first bus bar of said second dispenser and second bus bars for enabling connection and disconnection of said first bus bar to a second bus bar, wherein said electric switches are provided such that the second dispenser is connectable to at least one voltage converter, through a connection between a first bus bar and a second bus bar or between a first bar and a third bus bar, but not to all voltage converters.

[0019] In some embodiments, said at least one second dispenser is connectable to at least one voltage converter of each of said dedicated groups of voltage converters, through a connection between a first bus bar and a second bus bar or between a first bar and a third bus bar..

[0020] In some embodiments, the electric power storage device is a battery of a vehicle.

[0021] The charging system preferably comprise a control unit which is configured to control the operation of the switches and which is configured to decide which converters that are to be connected to which dispenser. The control unit is provided with software configured to make said decision on basis of the order in which the dispensers are taken into operation for charging, the power that is required from the respective operating dispenser and the rated power of the respective operating dispenser. Different priority considerations may be applied in order to enable a simultaneous and yet efficient charging by use of many of or all of the dispensers. The software of the control unit is configured to execute such priority considerations by controlling the individual switches of the charging system accordingly.

[0022] BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The foregoing will be apparent from the following more particular description of the example embodiments, as illustrated in the accompanying drawings in which like reference characters refer to the same parts throughout the different views. The drawings are not necessarily to scale, emphasis instead being placed upon illustrating the example embodiments.

[0024] Figure 1 illustrates an example charging system;

[0025] Figure 2 illustrates an example charging system comprising a set of first dispensers and a set of second dispensers, according to some embodiments; Figure 3 illustrates an example topology of interconnecting multiple bus bars, according to some embodiments; and

[0026] Figure 4 illustrates an example switch matrix having minimal number of electrical switches for a multi-dispenser charging system, according to some embodiments.

[0027] DETAILED DESCRIPTION

[0028] Aspects of the present disclosure will be described more fully hereinafter with reference to the accompanying drawings. The apparatus and method disclosed herein can, however, be realized in many different forms and should not be construed as being limited to the aspects set forth herein. Like numbers in the drawings refer to like elements throughout.

[0029] The terminology used herein is for the purpose of describing particular aspects of the disclosure only, and is not intended to limit the invention. It should be emphasized that the term "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.

[0030] Embodiments of the present disclosure will be described and exemplified more fully hereinafter with reference to the accompanying drawings. The solutions disclosed herein can, however, be realized in many different forms and should not be construed as being limited to the embodiments set forth herein.

[0031] It will be appreciated that when the present disclosure is described in terms of a method, it may 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 perform the steps, services and functions disclosed herein when executed by the one or more processors.

[0032] In the following description of exemplary embodiments, the same reference numerals denote the same or similar components. Electric vehicles, EVs, require electric charging stations that handle different battery capacities and have sufficient space and energy capacity for multiple charge dispensers to simultaneously connect and charge numerous EVs. In FIG. 2, a multi-dispenser charging system 200 is shown within which the present teachings of the invention may be implemented. The multi-dispenser charging system 200 includes a power grid that delivers high voltage in three phases. The power grid feeds a step-down transformer to bring down 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 that in turn supply its output to a plurality of first dispensers 203a-203n and a plurality of second dispensers 204a-204n. In some examples, the plurality of first dispensers 203 include fast chargers and the plurality of second dispensers include overnight chargers. Finally, the first dispensers 203a- 203n and the second dispensers 204a-204n provide a connector or a charging cable 210a- 210c and 220a-220c respectively for the first dispensers 203a-203n and the second dispensers 204a-204n for charging the EV.

[0033] The charging system 200 comprises M voltage converters and TV dispensers, where the total rated power of the dispensers is higher than that of the voltage converters. The voltage converters are flexibly connectable with the dispensers via a reconfiguration switch, or a matrix switch. The voltage converters are flexibly connectable with the dispensers via a reconfiguration switch, or matrix switch. In general, to reach the full rated power of a dispenser, several voltage converters need to be connected to the dispenser.

[0034] For example, if the power of a converter module is 100 KW and if the full rated power of dispenser module is 1 MW, then ten (10) voltage converters need to be connected to the dispenser, when there are more number of voltage converters 201a-201m, there are more number of buses that extend from these voltage converters 201a-201m.

[0035] Therefore, to minimize the number of buses, according to the embodiments of the present disclosure, a charging system 200 is provided. The charging system 200 comprises a plurality of first dispensers 203a-203n for charging electric power to an electric power storage device and a plurality of voltage converters 201a-201m for connecting a power source to the plurality of first dispensers 203a-203n. Each first dispenser 203a-203n has a rated power which is higher than a rated power of the voltage converters 201a-201m and the total rated power of the first dispensers 203a-203n is higher than the total rated power of the voltage converters 201a-201m. The charging system 200 further comprises a plurality of bus bars for connecting the first dispensers 203a-203n to the voltage converters 201a-201m, wherein each first dispenser 203a has a dedicated first bus bar connected to and extending from the first dispenser 203a and each voltage converter has a dedicated second bus bar connected to and extending from the voltage converter. Electrical switches are provided between first bus bars and second bus bars and between first bus bars and third bus bars for enabling connection and disconnection of a first bus bar to a second bus bar and of a first bus bar to a third bus bar. The electric switches are provided such that each first dispenser is connectable to at least so many voltage converters that, upon connection of the first dispenser to those voltage converters, the first dispenser will be able of delivering its rated power and a plurality of first bus bars being permanently disconnected from and not connectable to a plurality of second bus bars.

[0036] Various embodiments for minimizing the number of bus bars are described in conjunction with figure 3.

[0037] Figure 3 illustrates an example topology of interconnecting multiple bus bars, according to some embodiments.

[0038] In some embodiments, the number of bus bars that extend from the voltage converters 201a-201m are reduced. For example, one or more bus bars extending from the voltage converters are interconnected to reduce the number of these bus bars.

[0039] The number of bus bars are reduced based on a binary system of numbers. For example, the 3-digit binary number 101, represents '5' in a decimal number system. In general, the 3- digit binary number %2%l%0 (with digits x2 , xl , and %0 ) equals y xi 2i. i=O

[0040] Furthermore, in general, the 7V-d igit binary number XNXN-I ... x0equals Hence, with N digits, the numbers can be expressed from 0 to 2N- 1. Thus, with the proposed system, 2,vbus bars can be reduced to N by parallel connecting groups of 2‘ bus bars.

[0041] As depicted in FIG. 3, there are two groups of converters in which group 1 has 7 voltage converters and group 2 has 7 voltage converters. Further, there are dispensers 203a-203m, which are fast charging dispensers, and dispensers 204a-204m which are over night dispensers. Each first dispenser has a dedicated first bus bar connected to and extending from the first dispenser. For example, the dispenser 203a has a first bus bar 4.1 and likewise the dispenser 203b has a first bus bar 4.2, the dispenser 203c has a first bus bar 4.3 and the dispenser 203d has a first bus bar 4.3. Each first dispenser 203a-203n is connectable to at least so many voltage converters that and upon connection of the first dispenser to those voltage converters, the first dispenser will be able of delivering its rated power.

[0042] The voltage converters 1 to 7 in the group 1 has respective second bus bars 1.1, 1.2, 1.3, 1.4, 1.5, 1.6 and 1.7. The 7 voltage converters in the group 2 has respective second bus bars

[0043] 2.1, 2.2, 2.3, 2.4, 2.5, 2.6 and 2.7. Thus, each voltage converter has a dedicated bus bar (i.e.., 1.1 to 1.7 in group 1 and 2.1 to 2.7 in group 2) connected to and extending from the voltage converter.

[0044] In some embodiments, at least some of the second bus bars are interconnected to form third bus bars. In the above example, some of the second bus bars i.e., the bus bars 1.1 and

[0045] 1.2, and 1.3, and 1.4, 1.5 and 1.6 are interconnected.

[0046] The second bus bars 1.1 to 1.4 are interconnected to form a third bus bar 5.2 and the second bus bars 1.5 and 1.6 are interconnected to form a third bus bar 5.1 and the second bus bar 1.7 represents a third bus bar 5.0 as no interconnection is necessary. Thus, at least some of the second bus bars are interconnected to form the third bus bars which reduces the number of bus bars, i.e., in this example, seven (7) bus bars 1.1 to 1.7 are reduced to three (3) bus bars.

[0047] Similarly, the dedicated second bus bars 2.1 to 2.7 of the voltage converters in the group 2 are interconnected to form the third bus bars as shown in FIG. 3. In some embodiments, electrical switches are provided between first bus bars and second bus bars and between first bus bars and third bus bars for enabling connection and disconnection of a first bus bar to a second bus bar and of a first bus bar to a third bus bar.

[0048] As depicted in FIG. 3, electrical switches are provided between the first bus bars 4.1, 4.2, 4.3, 4.4 and the second bus bars 3.1, 3.2, 3.3, 3.4, 3.5, 3.6 and 3.7. The electrical switches are also provided between the first bus bars 4.1, 4.2, 4.3, 4.4 and the third bus bars 5.1, 5.2 and 5.3.

[0049] In some embodiments, the electrical switches provided between the first bus bars and second bus bars and between first bus bars and third bus bars represents a matrix switch. Thus, the matrix switch is provided between the third bus bars 5.1, 5.2 and 5.3 and the first dispenser 203a-203n buses 4.1, 4.2, 4.3, 4.4 and 4.5. Therefore, each FC dispenser 203a- 203n bus is connectable to a complete group of third bus bars 5.1, 5.2 and 5.3. The FC dispenser bus 4.1 is connectable to a group of third bus bars 5.1, 5.2 and 5.3 and the dispenser bus 4.2 is connectable to a group of third bus bars from group 2.

[0050] It should be noted that the number of third bus bars is smaller than the number second bus bars extending from the voltage converters i.e., the inlet buses. This reduces the size of the switching matrix between the third bus bars and the FC dispenser bus bars as compared with the size of a switching matrix between the second bus bars and FC dispenser bus bars.

[0051] In some embodiments, a plurality of first bus bars is permanently disconnected from and not connectable to a plurality of second bus bars to reduce the size of a switching matrix.

[0052] Thus, it should be noted that The FC dispenser bus 4.1 is connectable to a group of third bus bars 5.1, 5.2 and 5.3 and the dispenser bus 4.2 is connectable to a group of third bus bars from group 2. Every additional FC dispenser bus bar 4.3 and 4.4 is connectable to both complete third bus bars buses from group 1 and group 2.

[0053] In some embodiments, the second dispensers 204a-204n i.e., overnight charging dispensers are connectable to the voltage converters as shown in FIG. 3. In the example of Figure 3, as parallel connection of voltage converters to the second dispensers 204a-204n is not necessary. In this scenario, the switch matrix can be populated for example diagonally as shown in Figure 3. For reducing the number of buses, it is necessary to interconnect the second bus bars by means of switches (6) rather than providing a permanent connection. If power is provided to the dispensers 204a-204n, the switches (6) must be opened. If power is provided to the first dispensers 203a-203n, the switches (6) must be closed.

[0054] The example shown in FIG. 3 can be made applicable to a number of voltage converters. For example, when up to 3 voltage converters need to be connected in parallel for a second dispenser 204a, a bus reduction (7') similar to bus reduction (7) may be inserted before the switching matrix. Bus reduction (7') would only need two levels rather than three levels like bus reduction (7).

[0055] In another example, if upto 15 voltage converters need to be parallel connected for a first dispenser 203a, a four level (rather than three level) bus reduction is to be performed.

[0056] In another example, If the maximum number of voltage converters that need to be parallel connected is not a power of 2 i.e., (2n- 1), then the next higher power of 2 is to be selected to determine the number of levels of the bus reduction. For example, if up to 10 voltage converters need to be connected in parallel, a four-level bus reduction is performed. For example, if it is knows that the rated power for each FC dispenser is 1 MW, a power of about 150 kW per module would be favourable, since it results in 23- 1 = 7 voltage converters are to be connected in parallel. 125 kW per module may be less optimal, since it requires 8 voltage converters to be connected, and hence one level more.

[0057] After bus reduction is performed, the number of electric switches that are required for connecting the first bus bars and second bus bars can be minimized, thereby enabling connection and disconnection of the first bus bar to the second bus bar and of the first bus bar to the third bus bar.

[0058] Figure 4 illustrates an example switch matrix having minimal number of electric switches for a multi-dispenser charging system, according to some embodiments.

[0059] Consider that a fast charging dispenser 203a has a rated power of 1 MW and a voltage converter 201 has a rated power of 67 kW. Thus, 15 voltage converters are to be connected in parallel with the FC dispenser 203a to achieve the full power. The charging system 200 includes 5 FC dispensers and the voltage converters 201 are installed to operated 3 FC dispensers out of the 5 FC dispensers. Thus, 3MW of power is to be achieved using 45 voltage converters.

[0060] As depicted in FIG. 4, each group corresponds to 15 voltage converters. Without reduction in number of bus bars, each cell in the matrix corresponds to a column of 15 switches. This results in a total of 9 x 15 = 135 switches without reduction in number of bus bars. In case of 3-level bus reduction, only 4 instead of 15 switches are needed for each cell of the matrix shown in Figure 4, resulting in 9 x 4 = 36 switches.

[0061] In addition, 11 switches are used for the reduction of each of the voltage converters groups, resulting in a total of 9 x 4 + 3 x 11 = 69. When compared to the total number of switches which is 135, this is only 51 %; i.e., 49 % of the switches are saved.

[0062] Further, with the 45 voltage converters, 45 ONC dispensers can be charged. With 67 kW of rated power for each of the voltage converter, it takes 7.5 h to fully charge a 500 kWh battery. If the number of ONC dispensers does not exceed 22, the voltage converters can be connected in parallel into pairs of 134 kW. It should be noted that the number of switches for FC without reduction is 9 x 7 = 63. The number of switches for FC with reduction: 9 x 3+ 3 x 4 = 39, which is 62 % of the number without reduction, i.e., 38 % are saved.

[0063] The charging system comprises a control unit which is configured to control the operation of the switches and which is configured to decide which converters that are to be connected to which dispenser. The control unit is provided with software configured to make said decision on basis of the order in which the dispensers are taken into operation for charging, the power that is required from the respective operating dispenser and the rated power of the respective operating dispenser. Different priority considerations may be applied in order to enable a simultaneous and yet efficient charging by use of many of or all of the dispensers at the same time. The software of the control unit is configured to execute such priority considerations by controlling the individual switches of the charging system accordingly.

[0064] The foregoing description of the specific embodiments will so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and / or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents 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, while 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

CLAIMS1. A charging system (200) comprising- a plurality of first dispensers (203a-203n) for charging electric power to an electric power storage device, and- a plurality voltage converters (201a-201m) for connecting a power source to the plurality of first dispensers (203a-203m), wherein: each first dispenser (203a-203n) has a rated power which is higher than the rated power of each voltage converter (201a-201m), and the total rated power of the first dispensers (203a-203n) is higher than the total rated power of the voltage converters (201a-201m), and wherein the charging system (200) further comprises a plurality of bus bars for connecting the first dispensers (203a-203n) to the voltage converters (201a-201m), wherein each first dispenser (203a-203n) has a dedicated first bus bar (4.1-4.4) connected to and extending from the first dispenser and each voltage converter has a dedicated second bus bar connected to and extending from the voltage converter, wherein at least some of the second bus bars (1.1-1.7 and 2.1-2.7) are interconnected, such as to form third bus bars (5.0, 5.1 and 5.2), and wherein electrical switches are provided between first bus bars (4.1-4.4) and second bus bars (1.1-1.7 and 2.1- 2.7) and between first bus bars (4.1-4.4) and third bus bars (5.0, 5.1 and 5.2) for enabling connection and disconnection of a first bus bar to a second bus bar and of a first bus bar to a third bus bar, wherein said electric switches are provided such that: each first dispenser (203a-203n) is connectable to at least so many voltage converters that, upon connection of the first dispenser (203a) to those voltage converters (201a-201m), the first dispenser (203a) will be able of delivering its rated power, and wherein a plurality of first bus bars is permanently disconnected from and not connectable to a plurality of second bus bars (1.1-1.7 and 2.1-2.7).

2. A charging system (200) according to claim 1, wherein each first dispenser (203a-respective dedicated group of voltage converters (201a-201j) that will enable delivery of rated power from that dispenser when connected to that dispenser, and wherein at least one first dispenser (203k-203n), for which the remaining converters (201k-201m) not belonging to one of the groups dedicated to a dispenser of said group of dispensers have a total rated power which is lower than the rated power of that first dispenser 203a, is connectable to at least one voltage converter belonging to at least one of said dedicated groups, through a connection between a first bus bar (4.1-4.4) and a second bus bar (1.1- 1.7 and 2.1-2.7) or between a first bar (4.1-4.4) and a third bus bar (5.0, 5.1 and 5.2), to enable delivery of the rated power from that first dispenser upon connection thereof to any remaining voltage converter (201) not belonging to such a dedicated group and to at least one voltage converter (201) of at least one of said dedicated groups.

3. A charging system (200) according to claim 2, wherein said at least one first dispenser (203k-203n), for which the remaining voltage converters (201k-201m) not belonging to one of the groups dedicated to a dispenser of said group of dispensers have a total rated power which is lower than the rated power of that first dispenser (203a), is connectable to at least one voltage converter (201a-201j) of each of said dedicated groups, through a connection between a first bus bar (4.1-4.4) and a second bus bar (1.1- 1.7 and 2.1-2.7) or between a first bar (4.1-4.4) and a third bus bar (5.0, 5.1 and 5.2), to enable delivery of the rated power from that first dispenser (203a) upon connection thereof to any remaining voltage converter (201a-201n) not belonging to such a dedicated group and to at least one voltage converter (201) of at least one of said dedicated groups.

4. A charging system (200) according to claim 2 or 3, wherein said at least one first dispenser (203k-203n), for which the remaining voltage converters (201a-201n) not belonging to one of the groups dedicated to a dispenser of said group of dispensers has a total rated power which is lower than the rated power of that first dispenser(203a), is connectable to so many voltage converters of each of said dedicated groups, through a connection between a first bus bar (4.1-4.4) and a second bus bar (1.1-1.7 and 2.1-2.7) or between a first bar (4.1-4.4) and a third bus bar (5.0, 5.1 and 5.2), that delivery of therated power from that first dispenser 203a upon connection thereof to any remaining voltage converter not belonging to such a dedicated group and to any voltage converter of any of said dedicated groups is enabled.

5. A charging system (200) according to any one of claims 1-4, wherein at least one first dispenser (203a-203n) is connectable to at least so many voltage converters (201), through a connection between a first bus bar (4.1-4.4) and a second bus bar (1.1-1.7 and2.1-2.7) or between a first bar (4.1-4.4) and a third bus bar (5.0, 5.1 and 5.2), that, upon connection of the first dispenser (203a) to those voltage converters, the first dispenser will be able of delivering its rated power, and that said at least one first dispenser is also connectable to at least one further voltage-converter.

6. A charging system (200) according to any one of claims 1-5, wherein each first dispenser (203a-203n) is connectable to at least so many voltage converters (201), through a connection between a first bus bar (4.1-4.4) and a second bus bar (1.1-1.7 and2.1-2.7) or between a first bar (4.1-4.4) and a third bus bar (5.0, 5.1 and 5.2), upon connection of the first dispenser to those voltage converters (201), the first dispenser (203a-203n) will be able of delivering its rated power, and that each first dispenser is also connectable to at least one further voltage converter.

7. A charging system (200) according to any one claims 1-6, comprising at least one second dispenser (204a-204n), which has a rated power which is equal to or lower than the rated power of each voltage converter, wherein said second dispenser (204a) has a dedicated first bus bar (3.1-3.7) connected to and extending from the second dispenser (204a), and wherein electrical switches are provided between said first bus bar of said second dispenser and second bus bars for enabling connection and disconnection of said first bus bar to a second bus bar (204a), wherein said electric switches are provided such that the second dispenser (204a) is connectable to at least one voltage converter (201), through a connection between a first bus bar (3.1-3.7) and a second bus bar (1.1-1.7 and2.1-2.7) or between a first bar (3.1-3.7) and a third bus bar (5.0, 5.1 and 5.2), but not to all voltage converters (201).

8. A charging system (200) according to claim 7 , wherein said at least one second dispenser (204a-204n) is connectable to at least one voltage converter of each of said dedicated groups of voltage converters (201), through a connection between a first bus bar (3.1-3.7) and a second bus bar (1.1-1.7 and 2.1-2.7) or between a first bar (3.1-3.7) and a third bus bar (5.0, 5.1 and 5.2).

9. A charging system (200) according to any one of claims 1-8, wherein the electric power storage device is a battery of a vehicle.

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