LU102237B1 - Method for determining the wiring and function of power converters of a charging station for charging electric vehicles - Google Patents

Abstract

The present invention relates to a method for determining the power-side wiring and function of power converters of a charging station and a charging station for carrying out the method. The charging station includes several power converters, each with a communication port and a communication bus with an independent power supply. A power converter obtains electrical energy - from a supply network for charging an intermediate store or an electric vehicle battery or - from an intermediate store or upstream power converter for charging an electric vehicle battery. After the power converters have been connected to the communication bus, the outputs of all power converters are switched off, the input voltages of all power converters are measured and reported back to the communication bus in order to identify power converters connected to a supply current network. In the course of a cycle run through for each power converter, a first voltage is applied to the outputs of all power converters, a second voltage is applied to the output of exactly one selected power converter, the input and output voltages of all power converters are measured, reported back to the communication bus and, based on the measured voltages, the power-side wiring and function of the selected power converter determined.

Description

The present invention relates to a method for determining the wiring, in particular the wiring on the power side, and the function of power converters in a charging column for charging electric vehicles, and a corresponding charging column.

A charging station on which this method is based, in particular in the ready-to-operate state, comprises a plurality of power converters, each of which has an input, an output, a protective diode at the output and a separate communication connection, and a communication bus with a voltage supply that is independent of a voltage supply for the power converter. A respective power converter of the plurality of power converters is either - connected electrically to a power supply network on the input side and obtains electrical energy from this for charging an electrical energy storage device that can be electrically coupled on the output side, or - connected electrically to a power supply network on the input side and obtains electrical energy from this for charging an electrical energy storage device that can be electrically coupled on the output side The battery of an electric vehicle that can be connected to the charging station or - is electrically connected on the input side to an upstream power converter of the plurality of power converters and can be electrically coupled to an electrical energy store and draws electrical energy from the upstream power converter and, in the electrically coupled state, electrical energy from the electrical energy store for charging an output side electrically connectable battery of an electric vehicle that can be connected to the charging station.

In order to keep the charging times for charging batteries of electric vehicles at charging stations as short as possible, it is desirable for the charging stations to provide the greatest possible output power. This can be made possible by a charging station with a large number of charging modules, in which the outputs of a number of charging modules are connected in parallel, as is shown in FIG. 1 by way of example.

The individual charging modules, which each have at least one power converter, can communicate with one another and share the network power made available by a feed current network among themselves. In order to increase the output power of the charging station, especially in the case of insufficient mains power for a quick charging process, temporary storage devices are used to temporarily store the energy provided from the power supply network, e.g. in the form of accumulators or rechargeable batteries. If the battery is not being charged at the charging station of an electric vehicle, the buffer store is recharged with electrical energy from the power supply network via the mains connection.

Such intermediate storage can also be charged by solar charging modules. In the context of the present invention, a solar charging module is understood to mean a charging module which has at least one power converter and generates electrical energy from a photovoltaic system which is electrically connected to the charging module. The terms “on the input side” and “primary side” and the terms “on the output side” and “secondary side” are used synonymously in the context of the application.

The German patent application DE 10 2020 113 907.1 filed by the applicant for the Hicsiger application on May 25, 2020 discloses a modular charging station for charging a battery of an electric vehicle with direct current, which, in addition to a large number of technically identical charging modules, each has a certain number of electrically have separate self-sufficient charging units or power converters, a plurality of electrical energy storage devices, i.e. temporary storage devices. The modular character of the charging station is reflected in the fact that the charging station has several sub-strings that are electrically separate from one another, with a single sub-string having a charging unit or a power converter, an electrically connectable electrical energy store and a charging module. The individual sub-strings are brought together on the secondary side by connecting the outputs of several charging units or power converters in parallel, which means that the sum of the electrical energy that is stored in the individual electrically connected electrical energy stores of the sub-strings can be made available at the same time and the output power of the charging station is increased .

Such a charging station, as described in the introduction and disclosed, for example, in DE 10 2020 113 907.1, comprises a large number of individual components. In particular, DE 10 2020 113 907.1 provides a large number of charging modules, each with a plurality of power converters, expediently at least one solar charging module with at least one power converter and a number of intermediate storage devices. As a result, the high-performance wiring of the individual components in such a charging station is quite complex. Depending on how the individual power converters of the charging station are wired on the power side, they perform different tasks within the charging station. For example, a power converter can draw electrical energy from a supply current network, for example an AC network or a photovoltaic system, in order to charge either a battery of an electric vehicle or a electrical energy storage device, i.e. an intermediate storage device. However, a power converter can also obtain electrical energy from an electrical energy store or intermediate store in order to charge a battery of an electric vehicle.

Based on a charging station, as described above and in particular as disclosed in DE 10 2020 113 907.1, it is therefore an object of the invention to provide a method for determining the wiring, in particular the power-side wiring, and the function of the individual components, in particular the To develop power converters, this charging station, which is as easy and inexpensive to develop and easy to run by the operator.

The solution of the invention is a subject matter with the features of the independent claim | played back. Advantageous refinements and further developments are the subject matter of the further features of the dependent claims. Accordingly, the solution according to the invention relates to a method for determining the power-side wiring and the function of power converters of a charging station for electrically charging electric vehicles, the charging station having the following features. The charging station has, in particular in the operational state, - a plurality of power converters, each with an input, an output, a protective diode at the output and a separate communication port and

- a communication bus with a power supply independent of a power supply for the power converters. A respective power converter of the plurality of power converters is either - electrically connected to a power supply network on the input side and generates electrical energy from this for charging an electrical energy store that can be electrically coupled at the output side, or - electrically connected to a power supply network on the input side and generates electrical energy from this for charging an electrical energy storage device on the output side connectable battery of an electric vehicle that can be connected to the charging station or - is electrically connected on the input side to an upstream power converter of the plurality of power converters and can be electrically connected to an electrical energy storage device and draws electrical energy from the upstream power converter for charging an output side that can be electrically connected to a battery of an electric vehicle that can be connected to the charging station in the electrically coupled state, electrical energy from the electrical energy store.

The method is characterized in that the power-side wiring and function is determined for each of the plurality of power converters by applying a voltage to the output of a respectively selected power converter, which voltage differs from each of the outputs of the other power converters, measurement the voltages present at the respective inputs and outputs of the power converters and feedback of the measured voltages via the respective communication connections of the power converters to the communication bus.

In particular, the charging station method according to the invention comprises the following steps for implementation on this charging station, based on those described above: a) connecting the power converters via their respective communication connections to the communication bus, b) switching off the respective outputs of the power converters,

=) Grounding of input voltages present at the respective inputs of the power converters and back ripples of the gomessonen input voltages via the respective communication connection connections of the power converters to the Xommanikationstus, $ di determination of the Leishmgowandiers electrically connected to cin NYNINCSITINTIINEE using the EE nS spans measured in step €} , 0) Connection of the first voltage to the respective outputs of the power converters, 19 fi Selecting exactly one power converter from the series of solvent converters and connecting a second voltage, which is different from the first voltage, to the output of the selected power converter, 5} measuring voltages present at the respective inputs and outputs of the power converters and feedback of the measured. Voltages via the respective communication connections of the power converter to the communication house, to determine the circuit-related wiring and the fan facts of the selected power converter based on the voltages measured in step g}, 11 running through the steps où to hi for each of the plurality of 28 Loists.

First of all, in the erfischogagenution method according to step a}, all power converters of the charging station are connected electrically to the communication bus via their respective communication connections. Since the communication bus has voltage memometers that are independent of a voltage supply for the power converters, the respective power converters can then also communicate with one another and, in particular, measured ones Feedback voltage values at the caxvranncation house and send them via the core communication ass, no voltage data at the inputs of the respective power converters 3} After the communication between the power converters via the communication bus has been ensured, the outputs of all power converters are switched off according to step bY and then according to step 0) the input voltages of the individual power converters are measured. The measured input voltages are transmitted via the respective communication ports of the power converters reported back to the communication bus.

As a result, according to step d), it can be recognized which power converters are electrically connected to a feed current network on the input side or on the primary side. An input voltage is to be measured at the inputs of power converters which are electrically connected to a supply current network on the primary side. Based on the measured value of an input voltage, its type can also preferably be determined, i.e. cs it can be determined whether DC voltage or AC voltage is present and consequently whether the power supply network is a DC or AC network. In addition, the respective supply current sources or the type of supply current network can also be determined on the basis of the measured input voltages. On the other hand, there is no input voltage at the inputs of power converters, which on the primary side are not coupled to a supply current network but, for example, to an upstream power converter, since the outputs of all power converters, and thus also the power converters connected upstream of these power converters, are switched off.

For example, the input voltages measured in step c) can be output on an output device electrically connected to the communication bus on the charging station and then evaluated according to step d) of the method by an operator of the charging station. Alternatively or additionally, the input voltages measured in step c) can also be transmitted to a control unit which is electrically connected to the communication bus and which then carries out an evaluation of the measured input voltages in accordance with step d).

After the power converters electrically connected to a supply current network on the primary side have been identified, according to step e) a first voltage, which is also referred to as low level (or also low level) in the context of the present invention, is applied to the outputs of all power converters.

In the next step f), exactly one power converter of the charging station is selected, and a second voltage is applied to its output. The selection of the appropriate power converter can be done manually by the operator, for example via a control panel, a switch, push button, button 0.4., or automatically. This second voltage, which is also referred to as high level (or also high level) within the scope of the invention, can thus advantageously be clearly and unambiguously distinguished from the first voltage, the low level, also with the aid of inexpensive and simple measurement technology. In particular, it is provided here that the first voltage is always lower than the second voltage. For example, the first voltage or the low level can be in the range from 200 V to 350 V and the second voltage or the high level can be in the range from 350 V to 600 V. However, a hysteresc can also be installed, so that the first voltage can be increased to the second voltage or switched from the low level to the high level to a value of the second voltage or the high level in the range of, for example, 350 V to 600 V , in particular of about 400 V, and reducing the second voltage to the first voltage or switching from the high level to the low level to a value of the first voltage or the low level in the range of, for example, 200 V to 350 V, in particular of about 300 V.

This is followed in step g) by measuring the voltages present at the inputs and outputs of all power converters. The power converter at whose output the second voltage or the high level is present is clearly distinguishable from the power converters whose outputs, however, do not second voltage or the high level is present. The measured voltages are reported back to the communication bus via the respective communication connections of the power converters.

Based on these measured voltage values, the power-side wiring and the function of the selected power converter in the charging station are determined according to step h). If the selected power converter is electrically connected to one or more power converters on the output side or secondary side, then the second voltage or the high level is also present at the inputs of the power converters connected downstream of the selected power converter.

The function of these downstream power converters in the charging station is thus also determined. The measured voltages can be output, for example, on an output device electrically connected to the communication bus and analyzed by an operator of the charging station who carries out the method according to the invention.

This output device can be e.g. any digital display, a switch system or a system of optical elements, e.g.

lamp, scin.

The output facility is for each individual

Power converter at least clearly indicates whether at its input or

Output dic first voltage or the second voltage is present.

This can be done either by displaying specific voltage values or, for example, using correspondingly distinguishable optical elements for the first and second voltage.

As an alternative to this or in addition to this, the measured values reported back to the communication bus

Voltages are transmitted to a control unit that is electrically connected to the communication bus, which then determines the power-side wiring and the function of the selected power converter in the charging station.

In step i) of the method i) according to the invention, steps €) to h) are carried out for each individual power converter, i.e. the first voltage is again applied to the outputs of all power converters and the second voltage is then applied to the output of exactly one power converter etc. The order in which the individual power converters are selected in step f) is irrelevant for the method according to the invention, but all power converters should run through steps e) to h) once.

The method according to the invention therefore makes it possible to determine the wiring, in particular the power-side wiring, and the function of the power converters, and preferably also the electrical energy stores, without great technical effort and in a simple manner. The communication of the individual power converters of the charging station via the communication bus is reduced the complexity of the communication structure, the wiring effort and the need for connection terminals compared to a hierarchical communication structure.

In a hierarchical communication structure, a charging module for charging at least one electrical energy store has a number of so-called point-to-point communication connections, to which the downstream energy store and power converter are each directly electrically connected.

The electrically connectable electrical energy stores, which are expediently galvanically isolated from one another, can be included in the charging station. However, the charging station can also be electrically coupled to electrical energy stores, for example, only later. In this way, the operator of the charging station can himself select electrical energy storage as temporary storage according to the technical character of the vehicle battery to be charged with the charging station and electrically couple it to the charging station. As a result, the electrical energy storage devices are not a mandatory part of the charging station.

A further development of the invention provides for the step of detecting defective power converters and short-circuited power converters based on the voltages measured at the respective inputs and outputs of the power converters and, in the event of a detected defective or short-circuited power converter, outputting a corresponding error message at the charging station. For example, defective or short-circuited power converters can be detected as soon as the first voltage, i.e. the low level, is applied to the outputs of the power converters by measuring the voltages present at the inputs and outputs of the respective power converters immediately after the first voltage is applied, at the latest but in step g) defective or short-circuited power converters are detected based on the measured voltages at the respective inputs and outputs of the power converters. An error message can be output, for example, on a digital display or a screen of the charging station, but also by means of a switch or any optical display element, e.g. a red lamp on the corresponding power converter.

In particular, it is provided that with the power converters of the charging station electrically coupled electrical energy storage via a

Communication connection of the respective clektrische energy storage device are electrically connected to the communication bus, preferably in step a} of the method according to the invention, and that in step g) the voltage applied to the respective electrical energy storage devices is also measured and this respectively measured voltage is reported back to the communication bus. Even if the electrical energy stores are not electrically coupled to individual power converters, the voltages present at the electrical energy stores can still be measured, preferably by a measuring device of the electrical energy stores, and reported back to the communication bus.

In addition to the aforementioned steps of connecting the electrical energy storage device to the communication bus, the method according to the invention can also include the steps of electrically coupling at least one electrical energy storage device to individual power converters of the plurality of power converters and identifying which individual power converters of the plurality of power converters are connected to an electrical Energy stores are electrically coupled, in particular by running through steps e) to h) for each of the plurality of power converters. Electrical coupling of the electrical energy stores with individual power converters takes place after step a) and before step g) of the method according to the invention. Recognition that an electrical energy store is electrically coupled to individual power converters can be achieved in particular by identifying this electrical energy store as an electrical energy store via the communication bus, for example using an identifier or using an article number. By running through steps e) to h) and measuring the voltage present at the respective electrical energy stores in step g), it can be determined which power converters are electrically coupled to an electrical energy store. If an electrical energy store is electrically coupled, for example, to an upstream power converter, at the output of which the second voltage is applied, then the voltage measured at the input of the electrical energy store will correspond to the second voltage. The position of the power converters in the communication bus can also provide information as to whether a power converter is electrically coupled to an electrical energy store. In a further development of the method according to the invention, the step of assigning a unique identifier to each individual one of the plurality of power converters and assigning a unique identifier to each individual electrical energy store can also be provided. This means that each individual power converter and each individual electrical energy store can be distinguished and identified.

If the electrical energy storage devices are connected to the communication bus and the voltage present at the respective electrical energy storage devices is also measured in step g), the method according to the invention can also include the step of detecting defective electrical energy storage devices and short-circuited energy storage devices, e.g voltages present and outputs of the power converters and/or in particular based on the measured voltage present at the respective electrical energy stores and in the case of a detected defective energy spoke and "short-circuited" energy store include the step of outputting a corresponding error message at the charging station. An error message can be output, for example, on a digital display or a screen on the charging station, but also by means of a switch or any optical display element, e.g. a red light. The electrical energy stores can detect, in particular by means of a self-test, whether they are defective or short-circuited, and forward the result of this self-test to the communication bus. In a further development, the method according to the invention can also include the step of transmitting the measured input voltages in step c) and the measured voltages in step g) to a control unit of the charging station that is electrically connected to the communication bus in order to carry out steps d) and h) and/or include the step of outputting the determined power-side wiring and function of all power converters of the charging station, preferably by displaying at least one optical element on the charging station that is electrically connected to the communication bus.

Such a control unit receives the voltage values measured in steps c) and g) and uses these measured voltage values to determine according to the

Steps d) and h) the power converters electrically connected to a supply current network on the input side or on the primary side, as well as the wiring on the power side and the function of the power converter selected in step f).

In addition, the control unit can, for example, commands and commands via the

Send communication bus to each power converter.

For example, the control unit can arrange for the first voltage to be applied and the second voltage to be applied to the respective outputs of the corresponding power converters.

The control unit can thus assume the function of a central control of the process, but it cannot initiate the process autonomously

The process is always initiated by a human.

After initiation by a human, however, the method can run automatically.

For example, the method can be carried out automatically when the voltage on the communication bus is switched on.

Each individual power converter of the charging station preferably has its own controller, with the controller of a single power converter assuming a master function and corresponding to the control unit described above, while the respective controllers of the other power converters assume a slave function.

In combination or as an alternative to this, the determined power-side wiring and function of all power converters of the charging station can be output.

This output is preferably in the form of a display by means of at least one optical element, which is electrically connected to the communication bus, on the charging station.

For example, an output can be displayed on a screen. If a control unit is provided, the output of the power-side data determined is output

Wiring and function of all power converters preferably by displays on an optical display element, in particular a screen, which is electrically connected to the control unit via the communication bus, on the charging station.

An output of the determined power-side wiring can also be on a

website or on a smartphone, both as an alternative to and in addition to an output using an optical element on the charging station.

In addition, the present invention includes a charging station for the electrical charging of electric vehicles, in particular for carrying out a method according to one of the embodiments described above.

The charging station has - a plurality of power converters, each with an input, an output, a protective diode at the output and a separate communication connection, - a communication bus with a voltage supply that is independent of a power supply for the power converter, and - a control unit electrically connected to the communication bus, a respective The power converter of the plurality of power converters is electrically connected via its communication connection to the communication bus and either - on the input side electrically connected to a power supply network for charging an output side electrically coupleable electrical energy store with electrical energy from the power supply network or - on the input side electrically connected to a power supply network for charging an electrical power supply on the output side connectable battery of an electric vehicle that can be connected to the charging station with electrical energy from the supply current network or - input tig is electrically connected to an upstream power converter of the plurality of power converters and can be electrically coupled to an electrical energy store for charging a battery that can be electrically coupled on the output side of an electric vehicle that can be connected to the charging station with electrical energy from the upstream power converter and, in the electrically coupled state, with electrical energy from the electrical energy store .

The control unit is set up and designed to set voltages in a targeted manner at the respective outputs of the individual power converters via the communication bus in accordance with the method described above according to one of the described embodiments and based on the measured voltages present at the respective inputs and outputs of the individual power converters and via the

To determine the voltages provided for the communication bus, the wiring on the power side and the function of the individual power converters.

Further advantages, features and application possibilities of the present invention become clear from the following description of embodiments thereof and the associated figures. It shows: Figure 1: an interconnection of charging modules in a charging station according to the prior art, Figure 2: an exemplary interconnection of charging modules, a solar charging module and electric energy storage of a charging station according to the invention, Figure 3: a schematic overview of various functions of the power converters in a charging station according to the invention, in particular the charging station according to Figure 2, Figure 4: the effect of step b) of the method according to the invention on the interconnection according to Figure 2, Figure 5: the effect of step e) of the method according to the invention on the interconnection according to Figure 2, Figure 6 : the effect of step f) of the method according to the invention on the interconnection according to FIG. 2;

FIG. 1 shows a schematic overview of an interconnection of charging modules 1°, 2°, . . . , N' of a charging station 7' for charging electric vehicles according to the prior art. The charging station 7° shown comprises a large number of N charging modules 1°,

2*, . . . , N°, each of which has three power converters 11', 2i', 'are electrically connected to two phases of a three-phase AC network 8a on the primary side in FIG. 1 and connected in parallel on the secondary side. Such an interconnection of the charging modules 1', 2°, . The individual charging modules 1*, 2', ..., N' can communicate with each other and share the available network power among themselves. The interconnection of the charging modules 1°, 2', ..., N° is already predefined in FIG.

FIG. 2 shows a schematic overview of an exemplary connection of five charging modules 1, 2, 3, 4, 5, a solar charging module 6 and of electrical energy stores 9a that can be electrically coupled to the charging modules 2, 3, 4, 5 and the solar charging module 6 , 9b, 9c of a charging station 7 according to the invention, on which the method according to the invention is based. The connection represents a further development of the charging station disclosed in German patent application DE 10 2020 113 907.1.

The charging station 7 has a plurality of power converters li, 2i, 31, 4i, 51, 6a, where i=a, b, c in Figures 2-6. Each individual power converter li, 2i, 31, 41, 51, 6a has an input |, an output O, a protective diode at the output, which is not shown in the figures for reasons of clarity, and a separate communication connection 11, as in Figure 6 shown as an example. The charging station also includes a communication bus 12, as shown by way of example in FIG. 6, with a voltage supply that is independent of a voltage supply for the power converters 11, 2i, 31, 4i, Si, 6a. A respective power converter li, 2i, 31, 41, 51, 6a of the plurality of power converters li, 2i, 3i, 41, 5i, 6a is either - electrically connected to a power supply network 8a, 8b, 8c on the input side and obtains electrical energy from this for Charging an electrical energy store 9a, 9b, 9c that can be electrically coupled on the output side or - electrically connected to a power supply network 8a, 8b, 8c on the input side and obtains electrical energy from this for charging a battery that can be electrically coupled on the output side of an electric vehicle that can be connected to the charging station 7 or - Cingangsscitig with cinem upstream power converters 2a, 2b, 2c, 6a of the plurality of power converters li, 21, 3i, 4i, Si, 6a are electrically connected and can be electrically coupled to a clectic energy store 9a, 9b, 9c and can be used to charge a battery that can be electrically coupled on the output side Ladesäulc 7 connectable Flektrofahrzeugs electrical energy from the upstream Leis Device converter 2a, 2b, 2c, 6a and in the electrically coupled state, electrical energy from the clektrische Encrgiespeicher 9a, 9b, 9c.

Depending on how the individual power converters 11, 21, 31, 4i, 5i, 6a are wired in terms of power, they thus fulfill different tasks within the charging station 7, as shown in FIG.

The charging station 7 shown in FIG. 2 comprises a multiplicity of, for example, five charging modules 1, 2, 3, 4, 5, each of which, for example, has three power converters 11, 2i, 31, 4i, Si with 1=|, 2, 3. In further embodiments, the charging station 7 can comprise one of five different plurality of charging modules. In an embodiment that is not shown, the charging modules 1, 2, 3, 4, 5 can also each have a different number of power converters and more or fewer than three power converters. The individual power converters li, 2i, 3i, 4i, 51 in FIG be identical or structurally identical or not be structurally identical. To ensure that currents cannot be fed back from the output of a charging module 1, 2, 3, 4, 5, each individual power converter li, 2i, 3i, 4i, 5i has a protective diode at its output, but dic is included in the figures for reasons of clarity Figures is not shown. In addition, the charging station 7 shown in FIG. 2 also includes, by way of example, a solar charging module 6 that is electrically connected on the primary side to a supply current network in the form of a photovoltaic system 8b, with a power converter 6a and a plurality! of, in Figure 2 by way of example three, electrical energy stores 9a, 9b, 9c. According to the invention, the number of energy stores that can be electrically coupled to the individual power converters of the charging station 7 is not fixed at three, and the solar charging module 6 can also include more than one power converter 6a in a further embodiment that is not shown.

The charging station 7 has a modular structure and is subdivided into four sub-strings that are electrically separate from one another.

The first strand of the charging station 7 comprises a first charging module | with three power converters 1a, 1b, 1c, each of which is connected on the primary side to a supply current network, namely, for example, to two phases of a three-phase one

AC network or

Three-phase network 8a, are electrically connected and from this electrical energy for charging a battery that can be electrically coupled on the secondary side of a Flektrofahrzcugs that can be connected to the charging station 7.

The second branch of the charging station 7 has a first power converter 2a of a second

Charging module 2 of the charging station 7, an electrically connectable first electrical energy storage device 9a and a third charging module 3 of the charging station 7.

The first power converter 2a is electrically connected on the primary side to two phases of the three-phase AC network 8a, and draws electrical energy from this for charging the first electrical system, which can be electrically coupled on the downstream side

Energy store 9a and is also electrically connected to the third charging module 3 on the secondary side.

The third charging module 3 contains electrical energy from the upstream first power converter 2a and, in the electrically coupled state, electrical energy from the first electrical energy store 9a for charging a battery that can be electrically coupled on the secondary side of a battery that can be connected to the charging station 7

electric vehicle.

The third sub-string has a complementary structure to the second sub-string and includes a second power converter 2b of the second charging module 2 of the charging station 7, which is electrically connected on the primary side to two phases of the three-phase network 8a, a second electrical energy store 9b that can be electrically coupled, and a fourth charging module 4 of the charging station 7 for charging a battery that can be electrically coupled on the secondary side of an electric vehicle that can be connected to the charging station 7 .

In addition to a third power converter 2c of the second charging module 2 of the charging station 7, which is electrically connected to two phases of the three-phase network 8a on the primary side, the fourth sub-string also includes a solar charging module 6 with, for example, a power converter 6a, which is connected to a power converter on the primary side

Photovoltaic system 8b is electrically connected.

The third power converter 2c and the power converter 6a of the solar charging module 6 are connected in parallel on the secondary side, can be electrically coupled to a third electrical energy store 9c and electrically connected to a fifth charging module 5 of the charging station 7 for charging a battery of an electric vehicle that can be connected to the charging station 7, which battery can be electrically coupled on the secondary side.

In the electrically coupled state of the third electrical energy store 9c, it can be charged both via the third power converter 2c of the second charging module 2 with electrical energy from the three-phase network 8a and via the power converter 6a of the solar charging module 6 with electrical energy from the

Photovoltaic system 8b are charged and the fifth charging module 5 provide the stored electrical energy.

All four sub-strings of the charging station 7 are brought together on the secondary side by the outputs O of the power converters 3a, 3b, 3c, 4a, 4b, 4c, 5a, 5b, 5c of the third, fourth and fifth charging module 3, 4, 5 being connected in parallel and a | Charging connection 10 of the charging column 7 is supplied.

Figure 3 shows an exemplary schematic overview of the various

Functions of the individual charging modules 1, 2, 3, 4, 5 and the solar charging module 6 of a charging station 7 according to the invention, in particular according to FIG in Figure 3, only the upper and lower supply line shown in Figure 2 for feeding electrical energy into the

Charging connection 10 of the charging station 7 are shown symbolically.

On the left side of FIG. 3, two supply current networks are shown as an example, specifically a direct current network 8c (DC network connection point) and a three-phase alternating current network 8a (AC network connection point) with the phases L1, L2, L3.

About exactly one corresponding network connection (network connection point), symbolized by the

Identification “1” in Figure 3 is a loading module | and a power converter 2c of a charging module are electrically connected to these feed current networks and thus obtain electrical energy via the mains connection of at least one of the feed current networks, which serve as a feed current source.

The direction in which electrical energy is fed in is always illustrated in FIG. 3 by the direction of the arrow shown in each case, with the diamond symbol standing for the starting point or for the respective energy source.

The loading module | corresponds in the example of FIG. 2 to the first charging module 1 of the charging station 7 and stands symbolically for any number of charging modules of this type, which is expressed in FIG. 3 with the label “1..**. The charging module 1 has the function of charging the battery of an electric vehicle that can be connected to a charging connection 10 of the charging station 7 and is therefore referred to in FIG. 3 as the “car charger”. The power converter 2c is in Figure 3 according to the label "1..*" also symbolic for any number of power converters and corresponds in the example of Figure 2 to one of the power converters 2a, 2b, 2c of the second charging module 2 of the charging station 7. The power converter 2c is referred to as a “battery charger” in FIG. 3, since it has the function of feeding electrical energy into exactly one intermediate store or electrical energy store 9c, generally referred to as “battery” in FIG.

The fact that electrical energy is to be fed in from a power converter 2c into exactly one electrical energy storage device 9c in accordance with the arrow direction shown in FIG. 3 is symbolically illustrated in FIG. In addition, the electrical energy store 9c can be charged with energy from a photovoltaic system as a spcise power source, for example via a solar input, referred to in Figure 3 as "DC/DC Solarcintrag®, with the symbol "0..1" in Figure 3 for the number 0 or | stands. The solar input in FIG. 3 can be designed in particular as a solar charging module 6 electrically connected to a photovoltaic system with a power converter 6a, as shown in FIG. The electrical energy storage device 9c referred to as "battery" in Figure 3 can thus be charged by the power converter 2c and/or via the solar input and the stored electrical energy can be transferred to a charging module 5 in Figure 3, which is referred to in Figure 3 as a "buffered car charger “ is referred to, make available. In the example in FIG. 2, the charging modules 3, 4, 5 each assume the function of the “buffered car charger”. Like the charging module I, this “buffered car charger” has the function of feeding electrical energy into exactly one charging connection 10 of the charging station 7 in order to charge the battery of an electric vehicle that can be connected to the charging connection 10 . In contrast to the “car charger or charging module I”, the “buffered car charger” or the charging module 5, on the other hand, draws electrical energy from the electrical energy store 9c and not from a power supply network. Electrical energy from the “car charger” or charging module 1 and from the “buffered car charger” or charging module 5 can thus be made available to the charging connection 10 of the charging station 7 at the same time.

Based on the interconnection of the individual components of the charging station 7 shown as an example in Figure 2, the method according to the invention for determining the power-side wiring and the function of the power converters li, Zi, 3i, 41, 51, 6a, and preferably also the electrical

Energy storage 9a, 9b, 9c, the charging station 7 described in more detail using appropriate explanations.

Overall, the method is characterized in that for each of the

A plurality of power converters (li, 21, 31, 4i, Si, 6a) whose power-side wiring and function is determined by applying a voltage to the output (0) of a respectively selected power converter (11, 21, 31, 41, 51, 6a) which differs from each on the output (O) of the other power converters (li, 2i, 3i, 4i, 5i, 6a), measuring the at the respective inputs (I) and outputs (0)

the voltages present in the power converters (li, Zi, 3i, 4i, 5i, 6a) and feedback of the measured voltages via the respective communication connections (11) of the power converters (li, 2i, 3i, 4i, Si, 6a) to the communication bus (12) . Appropriately, this at the beginning of the process in a step a) the individual

Power converters li, 2i, 3i, 4i, 5i, 6a of the charging station 7 are electrically connected to the communication bus of the charging station 7 via their respective communication port.

The electrically connectable electrical energy stores 9a, 9b, 9c preferably also each have a communication connection and are electrically connected to the communication bus via this connection.

The communication bus has a voltage supply that is independent of a voltage supply for the power converters 11, 2i, 3i, 41, 51, 6a.

The individual power converters li, 2i, 3i, 4i, 5i, 6a can therefore also communicate with one another and, in particular, send measured voltage values via the communication bus when there is no voltage at the inputs I of the respective power converters 1i, 2i, 3i, 4i, Si, 6a applied.

For reasons of clarity, the respective communication connections 11 of the power converters 11, 2i, 3i, 4i, 5i, 6a and the electrical energy stores 9a, 9b, 9c and the communication bus 12 are shown in FIG. 6 merely as an example.

Each individual power converter 11, 2i, 3i, 41, Si, 6a of the charging station 7 and each individual electrically connectable electrical energy store 9a, 9b, 9c is preferably assigned a unique identifier, for example an address. In this case, the individual power converters 11, 21, 3i, 4i, 5i, 6a and electrical energy stores 9a, 9b, 9c that can be electrically coupled can identify one another via the communication bus by means of their identifier. FIG. 4 shows the effect of step b) of the method according to the invention on the interconnection shown in FIG. 2. In step b) of the method according to the invention, the respective outputs O of the power converters 11, 21, 31, 4i, Si, 6a are switched off. Consequently, there is no voltage at the outputs O of the power converters li, 2i, 31, 41, 5i, 6a, which is to be understood within the scope of the invention that the voltage present at the corresponding outputs O is expediently OV, but in particular less than 100 V is. As the legend of FIG. 4 indicates, the interconnection connected to the individual outputs O of the respective power converters 14, 2i, 3i, 4i, Si, 6a is shown with a dotted line. The respective power converters 1a, 1b, 1c, 2a, 2b, 2c of the charging modules } and 2 are each electrically connected to two phases of a three-phase network 8a, so that an alternating voltage (AC) is present at their inputs I, which is indicated in Figures 4-6 by a very bold solid line is symbolized. In addition, the power converter 6a of the solar charging module 6 is electrically connected to a photovoltaic system 8b. Consequently, a direct current (DC) voltage is present at the input I of the power converter 6a, indicated as “low” in FIGS. 4-6 and lying in a first voltage range.

Based on the wiring sketch according to FIG. 4, in step c) of the method according to the invention, the voltages present at the respective inputs I of the power converters li, 2i, 3i, 41, 51, 6a are measured an AC voltage present is measured at the inputs I of the power converters 1a, 1b, 1c, 2a, 2b, 2c, while a DC voltage present is measured at the input I of the power converter 6a. In contrast, no voltage present is measured at the inputs I of the power converters 3a, 3b, 3c, 4a, 4b, 4c, 5a, 5b, 5c. In addition, the input voltages measured in step c) are transmitted via the respective communication connections of the power converters li,

2i, 3i, 4i, Si, 6a reported back to the communication bus.

In the subsequent step d) of the method according to the invention, the measured input voltages are used to determine which of the power converters Hi, 2i, 3i, 41, Si, 6a are each electrically connected to a supply current network 8a, 8b, 8c.

Since no voltage was measured at the inputs I of the power converters 3a, 3b, 3c, 4a, 4b, 4c, 5a, 5b, 5c, it is concluded that these are not electrically connected to a power supply network 8a, 8b, 8c.

The power converters 1a, 1b, 1c, 2a, 2b, 2c, on the other hand, have to because of the | measured AC voltages to a power supply network 8a, 8b, 8c, in particular to a

AC power 8a, be connected clektrisch.

Likewise, the power converter 6a must be electrically connected to a power supply network 8a, 8b, 8c, in particular to a direct current network 8b, 8c, since a direct voltage was measured at its input I.

Thus, in step d), in particular, the type of input voltage applied in each case, i.e.

AC voltage or

DC voltage, and preferably also the respective power supply source or the power supply network based on the input voltages measured in step c), i.e. in addition to AC or

Direct voltage (AC/DC), also the specific voltage value, can be determined. Since the voltages in three-phase networks are standardized in every country, the AC voltage values measured at the inputs I der

Power converters 1a, 1b, 1c, 2a, 2b, 2c can be concluded as to whether these power converters 1a, 1b, 1c, 2a, 2b, 2c are electrically connected to a three-phase network 8a on the primary side.

For example, the nominal value of the star voltage, i.e. the voltage between the neutral conductor and any external conductor, in the low-voltage networks in Europe is always 230 V and the effective value of the line-to-line

Voltage, i.e. the voltage between two external conductors or

phases, always 400 V.

Furthermore, for example, an additional measurement of the impedance can indicate that the power supply network 8a, 8b, 8c or the DC network 8c is a photovoltaic system 8b.

In addition, for example by measuring the zero crossing of three power converters of a charging module via dic

Phase difference can be determined to which phases L1, L2, L3 these power converters are each electrically connected to an AC network.

Figure 5 shows the effect of step c) of the method according to the invention on the interconnection shown in Figure 2. According to step e), a first voltage is applied to the outputs O of all power converters 11, 2i, 3i, 4i, 51, 6a, i.e. on A first voltage is present at the outputs O of the individual power converters 13, 21, 31, 4i, 51, 6a, which is referred to below as “low level” (or also low level). In FIG. 5, the presence of this first voltage at the outputs O of the power converters 11, 2i, 31, 4i, Si, 6a is identified by a thin solid line. According to the legend of FIG. 5, the first voltage is labeled “DC low” and consequently corresponds to a low DC voltage, which can be between 200 V and 350 V in particular. In order to check whether there are defective or short-circuited power converters among the power converters 1i, 2i, 3i, 4i, 5i, after this step of applying the first voltage to the outputs O of the power converters li, 2i, 3i, 4i, 5i , 6a the voltage present at the respective outputs O can be measured. If no voltage is measured at one of the outputs O instead of the first voltage, the corresponding power converter must be defective or short-circuited. If a defective or short-circuited power converter is detected, a corresponding error message is preferably output at the charging station 7.

FIG. 6 shows the effect of step f) of the method according to the invention on the interconnection shown in FIG. In this step, exactly one power converter from the plurality of power converters li, 21, 31, 41, 51, 6a is first selected. Exactly one power converter can be selected from the plurality of power converters 1i, 21, 3i, 4i, 5i, 6a manually by the Operator or automatic.

For example, the operator can use a button, a switch, a control panel, etc. select one of the power converters li, 2i, 3i, 4i, si, 6a or the selection is made, for example, via an automatic random routine. In addition, in step f) a second voltage is applied to the output O of this selected power converter, for example the power converter 6a of the solar charging module 6 according to FIG.

Since the power converter 6a and the power converter 2c are connected in parallel on the secondary side, this second voltage is equally present at the outputs O of the power converters 6a and 2c. The second voltage is distinguishable from the first voltage, even when using cheaper and simpler

Measuring technology. As can be seen from the legend of FIGS. 4-6, the second voltage present at the outputs O of the power converters 6a and 2c, designated "DC high", is marked with a bold solid line. The second voltage corresponds to a higher DC voltage than the first voltage, which can be between 350 V and 600 V in particular.

In the subsequent step g} of the method according to the invention, the voltages present at the respective inputs I and outputs O of the power converters 11, 2i, 31, 4i, 5i, 6a are measured based on the wiring sketch according to FIG.

The measured voltages are reported back to the communication bus 12 via the respective communication connections 11 of the power converters 11, 2i, 3i, 4i, 5i, 6a. In addition, the measured voltages can be output on an output device 15 which is shown in FIG. 6 and is electrically connected to the communication bus 12 . In FIG. 6, the output device 15 is, for example, a digital display on a screen, but in a further embodiment it can also be a switch system or a system of optical elements, e.g. lamps. The output device 15 according to FIG. 6 shows the specific voltage values measured in step g), but also the input voltages measured in step c). Thus, an operator of the charging station 7 can evaluate the measured voltages displayed by the output device 15 by looking at the measured voltages Figure 6 of the power converter 6a determined. For example, it is found in FIG. 6 that the second voltage is present both at the output O of the selected power converter 6a and at the output O of the power converter 2c. Accordingly, the power converters 6a and 2c must be connected in parallel on their secondary side. In addition, it is established that the second voltage is present at the inputs I of the power converters 5a, 5b, 5c of the charging module 5 in each case. The power converters 6a and 2c must therefore be electrically connected on the secondary side to the inputs I of the power converters 5a, 5b, Sc, i.e. upstream of the power converters 5a, 5b, 5c. Furthermore, the power converters 5a, 5b, 5b must on their

primary scite connected in parallel scin. It was already established in step c) of the method according to the invention that, among other things, the power converters 2c and 6a are connected on their primary side to a feed current network 8a, 8b, 8c. Based on the concrete measured value of the input voltage present at the inputs I of the power converters 2¢ and 6a, it can be recognized both in step c) and in step h) that the power converter 2c is connected on the primary side to a three-phase AC network 8a and the power converter 6a is connected to the primary side a direct current network, in particular to a photovoltaic system 8b, is electrically connected. That is, the power converters 2c and 6a can be distinguished from one another in that they are electrically connected primarily to different supply current sources or power supply systems.

The voltages measured in step h} can, if not already done in step ¢), also be used to identify whether there are defective or short-circuited power converters among the individual power converters 11, 2i, 31, 4i, 51, 6a. If an existing voltage is measured at one of the outputs O instead of the first voltage or the second voltage, which is significantly lower than the first voltage, in particular lower than 100 V, the power converter with this corresponding output O must be defective or short-circuited. In this case, a corresponding error message is preferably output at the charging station 7 .

In order to determine the power-side wiring and the function of each individual power converter li, 2i, 3i, 41, 51, 6a in the charging station 7, according to step i) of the method according to the invention, steps e) to h) are carried out for each of the plurality of power converters 11, Zi, 31, 4i, 51, 6a run through.

If, for example, after the first voltage, i.e. "DC low", is applied to the outputs O of the power converter (step e)) again, the power converter 2a is selected and the second voltage, i.e. "DC high", is applied to its output O (step f }), the second voltage is measured in step g) at the output O of the power converter 2a and at the inputs I of the power converters 3a, 3b, 3c of the charging module 3 (not shown in the figures). Based on these measurement results it can be determined in step h) that the

Power converter 2a must be electrically connected on the primary side to cin as a three-phase AC power supply system 8a and must be electrically connected on the secondary side to the inputs I of the power converters 3a, 3b, 3c. In addition, the power converters 3a, 3b, 3c must be connected in parallel on the primary side.

As shown in Figure 6 by way of example, the electrical energy stores 9a, 9b, 9c that can be electrically coupled to the power converters 2i, 31, 41, Si, 6a of the charging station 7 can be connected to the communications bus 12 be connected electrically. Furthermore, in step g) the voltage present at the respective electrical energy stores 9a, 9b, 9c can be measured and the respectively measured voltage can be reported back to the communication bus 12. Even if the electrical energy stores 9a, 9b, 9¢ are not electrically coupled to individual power converters 11, 21, 31, 41, 51, 6a, the voltages present at the electrical energy stores 9a, 9b, 9c can be measured, preferably by a measuring device the electrical energy store 9a, 9b, 9c, and reported back to the communication bus 12. In FIGS. 2 and 4-6, the electrical energy stores 9a, 9b, 9c are always shown not electrically coupled to individual power converters 2i, 3i, 4i, Si, 6a. However, in addition to connecting the electrical energy stores 9a, 9b, 9c to the communication bus 12, at least one electrical energy store 9a, 9b, 9c can be electrically coupled to individual power converters of the plurality of power converters 1i, 2i, 3i, 4i, 5i, 6a . Furthermore, it can be recognized which individual power converters of the plurality of power converters 11, 2i, 31, 4i, Si, 6a are electrically coupled to an electrical energy store 9a, 9b, 9c. For example, an electrical energy store 9a, 9b, 9c, which is electrically coupled to individual power converters 2i, 3i, 4i, 5i, 6a, can be identified as an electrical energy store 9a, 9b, 9c via the communication bus 12. In particular, provision can be made for a unique identifier to be assigned to each individual electrical energy store 9a, 9b, 9c and also to each individual one of the plurality of power converters 11, 2i, 3i, 4i, 5i, 6a. Thus, the individual power converters li, 2i, 3i, 4i, 5i, 6a and the individual electric

Energy stores 9a, 9b, 9c voncinander distinguishable and each identifiable. In particular, by going through steps €) to h) and measuring the voltage present at the respective electrical energy stores 9a, 9b, 9c in step g}, it can be determined which power converters 2i, 3i, 41, 5i, 6a have an electrical energy store 9a, 9b, 9c are electrically coupled, if an electrical energy store 9a, 9b, 9c is electrically coupled, for example, to an upstream power converter 2a, 2b, 2c, 6a, at the output of which the second voltage is applied, then the voltage at the input of the electrical Energy store 9a, 9b, 9b measured voltage correspond to the second voltage, which is greater than the internal voltage of the corresponding electrical energy store 9a, 9b, 9c and which is also distinguishable from the internal voltage of the elckttischen Encrgiespichers 9a, 9b, 9c, Cin connecting the electrical Energy storage 9a, 9b, 9c to the communication bus 12 and in step g) also a measurement of the respective If the voltage present in the electrical energy stores 9a, 9b, 9c is defective, defective electrical energy stores and short-circuited energy stores can also be detected, e.g. based on the measured voltages present at the respective inputs and outputs of the power converters and/or in particular based on the voltages present on the respective electrical energy stores 9a, 9b, 9c applied measured voltage can be detected. If a defective energy store or a “short-circuited” energy store is detected, a corresponding error message can be output at the charging station 7 . An error message can be output, for example, on a digital display or a screen, but also by means of a switch or an optical display element, for example a small red lamp. The electrical energy stores 9a, 9b, 9c can, in particular, use a self-test to identify whether they are defective or short-circuited and forward the result of this self-test to the communication bus 12.

As can be seen from Figure 6, for example, the input voltages measured in step c) and those measured in step g) at the inputs I and outputs O of the power converters li, 2i, 3i, 4i, 5i, 6a and preferably also at the electrical energy stores 9a, 9b, 9c measured voltages applied to one of the

Communication bus 12 electrically connected control unit 13 of the charging station 7 for performing steps d) and h) transmitted. On the basis of the measured voltage values received, the control unit 13 determines the power converters that are primarily electrically connected to a supply current network, as well as the power-side wiring and the function of the power converter selected in step f}. In addition, the control unit 13 can, for example, send commands and commands via the communication bus 12 to the individual power converters 11, 21, 31, 4i, 5i, 6a. For example, the control unit 13 can set specific voltages or order the application of the first voltage and the application of the second voltage to the respective outputs O of the corresponding power converters 11, 21, 31, 4i, 5i, 6a. The control unit 13 can thus assume the function of a central control of the method, but it cannot initiate the method autonomously. The process is always initiated by a human, but the process can then run automatically. As shown by way of example in Figure 6, each individual power converter li, 21, 31, 4i, 51, 6a of the charging station 7 has its own controller 14. The controller 14 of a single power converter, in Figure 6 the power converter 2a, assumes the master function and corresponds to the control unit 13 described above, while the respective controllers 14 of the other power converters li, 2b, 2c, 31, 40, 51, 6a assume a slave function. However, there are also other versions of a control unit 13 for carrying out steps d} and h) possible.

In combination with or as an alternative to the control unit 13 described above, the determined power-side wiring and function of all power converters 11, 2i, 3i, 4i, 51, 6a of the charging station 7 can be output. This output is preferably in the form of a display by means of at least one optical element which is electrically connected to the communication bus 12 on the charging station. For example, an output can take place on a screen. If a control unit 13 is provided, the output of the determined power-side wiring and function of all power converters 1i, 2i, 3i, 4i, 5i, 6a preferably takes the form of displays on an optical display element, in particular a screen, that is electrically connected to the control unit 13 via the communication bus 12 , at the charging station 7.

FIG. 7 shows the sequence of the method according to the invention for determining the power-side wiring and function of the charging modules in the charging station in the form of a flow chart and summarizes the essential method steps. The method according to the invention is first started by a person, in particular an operator of the charging station, which is symbolized by the black circle in FIG. 7, at the top. Starting can be done, for example, by pressing a start button, also via a control panel, or by actuating a switch. First, after steps a) to c) have been completed, according to step d), the power converters connected to a power grid are determined. A first voltage (“low” or “low*) is then applied to the outputs of all power converters (step c)). Then exactly one power converter or one output of a power converter is selected in order to apply a second voltage (“high” or “high”) to this selected output (step f)). The voltages present at the inputs and outputs of all power converters are then measured or read out (step g)) in order to determine the power-side wiring and function of the selected power converter in the charging station (step h), not explicitly shown in Figure 7). The first voltage (“low”) is then applied again to the output of the selected power converter, which is equivalent to processing step e) again.

As the arrow indicates starting from the latter step towards the step of selecting an output or a power converter, steps f) to g) or h) are executed again. When steps e) to h) have been carried out for each individual power converter of the charging station, the method according to the invention ends, since the power-side wiring and function of all power converters of the charging station have then been determined.

List of reference symbols 1, 2, 3, 4, 5, 1*, 2', N° charging module 11, Zi, 3i, 4i, Si, 11', 21*, Ni* power converter of a charging module 6 solar charging module ba power converter of the solar Charging module 7 charging column 8a three-phase AC network 8b photovoltaic system 8c DC network 9a, 9b, 9c clectic energy storage 10 charging connection 1 communication connection 12 communication bus 13 control device 14 control of a power converter 15 output device I input of a power converter O output of a power converter LI, L2, L3 phases of a three-phase AC network 0 starting point or energy source for feeding in electrical energy 1..* any number 1 to N

0..1 0 or 1

Claims (11)

patent claims 1. Method for determining the wiring, in particular the power-side wiring and the function of power converters (li, 21, 31, 41, 51, 6a) of a charging station (7) for electrically charging electric vehicles, the charging station (7), in particular in the operational state, - a plurality of power converters (11, 21, 31, 4i, 51, 6a) each having an input (1), an output (0), a protective diode at the output and a separate communication port (11) and - a communication bus (12) having a voltage supply that is independent of a voltage supply for the power converters (li, 2i, 31, 4i, 5i, 6a), wherein a respective power converter (li, 21, 31, 4i, 51, 6a) of the plurality of power converters (11 , 2i, 31, 41, 51, 6a) either - is electrically connected at the input to a power supply network (8a, 8b, 8c) and from this receives electrical energy for charging an electrical energy store (9a, 9b, 9c) which can be coupled electrically on the output side or - is electrically connected on the input side to a power supply network (8a, 8b, 8c) and draws electrical energy from this for charging a battery, which can be electrically coupled on the output side, of an electric vehicle which can be connected to the charging station (7), or - on the input side, with an upstream power converter (2a, 2b, 2c, 6a) of the plurality of power converters (11, 21, 31, 41, 51, 6a) and can be electrically coupled to an electrical energy store (9a, 9b, 9c) and for charging a battery that can be electrically coupled on the output side of a battery on the charging station (7) connectable electric vehicle draws electrical energy from the upstream power converter (2a, 2b, 2c, 6a) and, in the electrically coupled state, electrical energy from the electrical energy store (9a, 9b, 9c), characterized in that for each of the plurality of Power converters (li, 2i, 3i, 4i, Si, 6a), the power-side wiring and function is determined, and e.g was by applying a voltage to the output (O) of a respectively selected power converter (li, 2i, 3i, 4i, 5i, 6a), which from each to the output (O) of the other power converters (11, 2i, 3i, 41 , 51, 6a), measuring the voltages present at the respective inputs (I) and outputs (0) of the power converters (li, 2i, 3i, 41, 5i, 6a) and reporting back the measured voltages via the respective communication connections (11) the power converter (li, 2i, 3i, 4i, 5i, 6a) to the communication bus (12). 2. The method according to claim 1, with the steps: a) connecting the power converters (11, 21, 31, 4i, 5i, 6a) via their respective communication connections (11) to the communication bus (12), b) switching off the respective outputs ( 0) the power converter (11, Zi, 31, 4i, Si, 6a), c) measuring the input voltages present at the respective inputs (I) of the power converter (11, 21, 31, 4i, 5i, 6a) and reporting back the measured Input voltages via the respective communication connections (11) of the power converters (li, 21, 31, 41, 51, 6a) to the communication bus (12), d) determining the power converters ( 1a, 1b, 1c, 2a, 2b, 2c, 6a) based on the input voltages measured in step c), e) applying a first voltage to the respective outputs (O) of the power converters (li, 21, 31, 41, 5i, 6a ), f) selecting exactly one power converter (11, 2i, 31, 41, 51, 6a) from the plurality of power s converter (li, 2i, 31, 4i, 51, 6a) and applying a second voltage, which can be distinguished from the first voltage, to the output (O) of the selected power converter (li, 21, 31, 41, 51, 6a) , g) Measuring the voltages present at the respective inputs (T) and outputs (0) of the power converters (11, 21, 31, 41, 5i, 6a) and reporting back the measured voltages via the respective communication connections (11) of the power converters (li , 21, 31, 41, Si, 6a) to the communication bus (12), h) determining the power-side wiring and the function of the selected power converter (li, 21, 3i, 41, 51, 6a) based on the measured in step g). voltages, 1) performing steps e) to h) for each one of the plurality of power converters (li, 2i, 3i, 4i, 5i, 6a). 3. The method according to claim 2, characterized by the step of detecting defective power converters and short-circuited power converters using measured values present at the respective inputs (I) and outputs (0) of the power converters (li, 21, 31, 4i, 5i, 6a). Voltages and, if a defective or short-circuited power converter is detected, a corresponding error message is output at the charging station (7). 4. The method according to claim 2 or 3, characterized by dic steps of connecting the with the power converters (li, 21, 31, 4i, 51, 6a) of the charging station (7) electrically coupleable electrical energy storage (9a, 9b, 9c) via a Communication connection (11) of the respective electrical energy store (9a, 9b, 9c) to the communication bus (12) and in step g) also measuring the voltage present at the respective electrical energy store (9a, 9b, 9c) and reporting back the respectively measured Voltage to the communication bus (12). 5. The method according to claim 4, characterized by the steps of electrically coupling at least one electrical energy store (9a, 9b, 9c) to individual power converters (2i, 3i, 4i, Si, 6a) of the plurality of power converters (li, 21, 31 , 41, 5i, 6a) and recognizing which individual power converters (2i, 3i, 4i, 5i, 6a) of the plurality of power converters (li, 2i, 3i, 41, 51, 6a) have an electrical energy store (9a, 9b , 9c) are electrically coupled, in particular by running through steps e) to h) for each one of the plurality of power converters (li, 2i, 3i, 41, 51, 6a). 6. The method according to claim 4 or 5, characterized by the step - of detecting defective electrical energy storage devices and short-circuited energy storage devices based on the respective inputs (I) and outputs (O) of the power converters (li, 2i, 3i, 4i, Si, 6a) the measured voltages present and/or the measured voltage present at the respective electrical energy stores (9a, 9b, 9c) and/or by means of a self-test, and - in the event that a defective energy spoke and "short-circuited" energy store is detected, a corresponding error message is output the charging station (7). 7. The method according to any one of the preceding claims 2 to 6, characterized in that the selection of exactly one power converter (li, 2i, 3i, 4i, Si, 6a) from the plurality of power converters (li, 2i, 3i, 4i, Si, 6a) in step f) manually by the operator or automatically. 8. The method according to any one of the preceding claims 2 to 7, characterized in that in step d) also a determination of the type of input voltage present, preferably also cin determination of respective supply current sources based on the input voltages measured in step c). 9, Method according to cinem of the preceding claims 2 to 8, characterized by the step of outputting the voltages measured in step g) on an output device (15) which is electrically connected to the communication bus (12). 10. The method according to any one of the preceding claims 2 to 9, characterized by the step of transmitting the measured input voltages in step c) and the measured voltages in step g) to a communication bus (12) electrically connected control unit (13) of the charging station for Carrying out steps d) and h) and/or the step of outputting the determined power-side wiring and function of all power converters (li, 2i, 3i, 4i, 5i, 6a) of the charging station (7), preferably by displaying at least one on the Communication bus (12) electrically connected optical element to the charging station (7). 10. The method according to any one of the preceding claims 2 to 10, characterized by the step of assigning a unique identifier to each one of the plurality of power converters (11, 2i, 31, 41, Si, 6a) and assigning a unique identifier to each one electrical energy store (9a, 9b, 90). 11. Charging station (7) for electrically charging electric vehicles, in particular for carrying out a method according to one of the preceding claims, wherein the charging station (7) - a plurality of power converters (11, 2i, 3i, 41, 51, 6a) each having an input (I), an output (0), a protective diode at the output and a separate communication port (11), - a communication bus (12) with a voltage supply that is independent of a voltage supply for the power converters (li, 21, 31, 41, 51, 6a) and a control unit (13) that is electrically connected to the communication bus (12), where a respective power converter (li, 21, 31, 41, Si, 6a) of the plurality of power converters (11, 21, 31, 41, Si, 6a) via its communication port (11) is electrically connected to the communication bus (12) and either - on the input side to a power supply network (8a, 8b, 8c) is electrically connected for charging an output-side electrically coupleable electronic energy storage device (9a, 9b, 9c) with electrical energy from the power supply network (Ba, 8b, 8c) or - connected electrically to a power supply network (8a, 8b, 8c) on the input side is for charging a battery that can be electrically coupled on the output side of an electric vehicle that can be connected to the charging station with electrical energy from the supply current network (8a, 8b, 8c) or - on the input side with an upstream power converter (2a, 2b, 2¢, 6a) of the plurality of power converters (li , 21, 3i, 41, 51, 6a) is electrically connected and can be electrically coupled to an electrical energy store (9a, 9b, 9c) for charging a battery that can be electrically coupled on the output side of an electric vehicle that can be connected to the charging station (7) with electrical energy from the upstream vehicle Power converter (2a, 2b, 2c, 6a) and in the electrically coupled state with electrical energy from the electrical energy store (9a, 9b, 9c), wherein the control unit (13) is set up and designed to the respective outputs (0) of individual power converters (11, 21, 31, 41, 51, 6a) via the communication bus (12) according to the method in any of claims 1-11 in a targeted manner ments and based on the respective inputs (I) and outputs (O) of the individual power converters (11, 2i, 3i, 4i, 5i, 6a) present measured and made available via the communication bus (12). To determine voltages in the power-related wiring and function of the individual power converters (li, 21, 31, 4i, Si, 6a).