Loading arrangement, method and control device for operating the loading arrangement

Abstract

The charging arrangement (CA) includes a charging port (CP), a battery port (ACCP) and a vehicle-side charging device (OBC). The charging device (OBC) is configured to convert an alternating voltage applied to the AC terminal into a first system DC voltage and to provide the first system DC voltage at the DC terminal, and to convert a charging DC voltage applied to the AC terminal into the first system DC voltage and to provide the first system DC voltage at the DC terminal. Furthermore, the charging arrangement includes a load terminal (LP) configured for electrical connection to at least one high-voltage load (HV-AUX) of the vehicle and connected to a DC terminal of the charging device. The charging arrangement also includes a connection arrangement with electrical connection paths (L1, ..., L8) and controllable disconnect devices (IS1, ..., IS6) for establishing and interrupting the respective electrical connections of the connection paths (L1, ..., L8) to provide a set of operating modes for the charging arrangement (CA).

Description

[0001] The invention relates to a charging arrangement for an electrically powered vehicle, preferably a battery electric vehicle (BEV). The invention further relates to a method and a control device for operating the charging arrangement. It also relates to a charging system with such a charging arrangement, a computer program, and a computer-readable medium.

[0002] Unidirectional and bidirectional charging devices for battery electric vehicles are widely known from the prior art and are conventionally referred to as on-board chargers (OBCs). Such charging devices in the form of on-board chargers (OBCs) for electric vehicles ensure that the vehicle's electrical energy storage system, or battery, for example in the form of a high-voltage energy storage system or a high-voltage battery, is charged and discharged safely and efficiently.

[0003] The North American Charging Standard (NACS), currently standardized as SAE J3400 and also known as the Tesla charging standard, is a charging connector system for battery electric vehicles (BEVs) developed by Tesla, Inc. The charging connector system was released for use by other manufacturers in November 2022.

[0004] The NACS charging port system supports both AC and DC charging. AC charging is typically used for slower overnight charging, while DC charging is used for fast charging.

[0005] Most electric cars are still designed for a system voltage of 400 volts. After several manufacturers of premium passenger vehicles began using a system voltage of 800 volts, other manufacturers are now also offering vehicles with this system voltage.

[0006] In order to make optimal use of the charging infrastructure, it is necessary that 800V vehicles can be charged with 800V via the NACS charging input.

[0007] One task to be solved is to provide a charging arrangement for a vehicle and a method for operating the charging arrangement that enables the vehicle to be charged with a variety of different charging voltages in a cost-effective and / or high-voltage safe manner and / or with increased comfort for the vehicle user.

[0008] The problem is solved by the features of the independent patent claims. Advantageous embodiments are characterized in the dependent claims.

[0009] According to a first aspect, the aforementioned task is solved by a charging arrangement for the battery of an electrically powered vehicle. The charging arrangement has a charging port configured to connect the charging arrangement to an external charging device (SE). Furthermore, the charging arrangement has a battery port configured to connect the charging arrangement to the battery and which can be connected directly to the vehicle's battery, in particular without the need for intermediate battery contactors or accumulator contactors. Depending on the safety concept, however, fuses may be installed between the battery port and the battery.

[0010] The charging arrangement comprises a vehicle-side charging device with an AC voltage connection and a DC voltage connection. The charging device is designed to convert the AC voltage applied to the AC voltage connection into a DC voltage and make it available at the DC voltage connection.

[0011] The charging device is preferably configured to convert alternating voltages with different amplitudes and / or different frequencies into the desired direct voltage. In particular, the charging device is configured to convert a first alternating voltage and a second alternating voltage into a first system direct voltage.

[0012] The charging device is further designed to convert a DC charging voltage applied to the AC voltage connection into the first system DC voltage and to provide the first system DC voltage at the DC voltage connection.

[0013] The charging arrangement further includes a load connection designed to connect the charging arrangement to at least one high-voltage load of the vehicle, in particular a high-voltage auxiliary power unit of the vehicle. The charging connection is connected to the DC terminal of the charging device.

[0014] The charging arrangement comprises a connection arrangement including electrical connection paths with controllable disconnect devices. The controllable disconnect devices serve to establish and break the electrical connections of the respective connection paths to provide a set of predefined operating modes for the charging arrangement. The set includes at least one second operating mode.

[0015] The charging arrangement is designed, in the second operating mode, to provide a second DC charging voltage, equal to a second system DC voltage (for example, 400V), at the battery terminal for charging the battery and at the AC terminal of the charging device, while keeping the load terminal free from being supplied with the second system DC voltage. Furthermore, the charging arrangement is designed to provide the first system DC voltage at the load terminal via the charging device. In this case, the second system DC voltage is lower than the first system DC voltage.

[0016] The accumulator preferably has a first system DC voltage. That is, the accumulator is configured to provide a supply voltage in a charged state that is equal to or approximately equal to the first system DC voltage, and the accumulator is configured to be charged with a charging voltage that is equal to or approximately equal to the first system DC voltage.

[0017] The vehicle's battery preferably comprises several battery modules that can be connected in series and / or parallel. In particular, the battery is switchable and, depending on the switching configuration, can be charged with either the first system DC voltage or the second system DC voltage.

[0018] For a vehicle that is operated with the first system DC voltage in normal driving operation, in particular an 800V BEV, the charging arrangement has the advantage that during DC charging with the second system DC voltage, in particular with 400V, the high-voltage loads, in particular the high-voltage auxiliary units, such as an electric heater, an air conditioning compressor or a high-voltage-to-low-voltage DC converter, can continue to be operated with or supplied with the first system DC voltage.

[0019] In at least one advantageous embodiment according to the first aspect, the set of operating modes further comprises a first and / or a third and / or a fourth operating mode. In the first operating mode, the charging arrangement is configured to provide a first DC charging voltage, equal to the first system voltage (for example, 800 V), at the accumulator terminal for charging the accumulator and at the load terminal for operating the at least one high-voltage load. In the third operating mode, the charging arrangement is further configured to convert an AC voltage provided at the charging terminal into the first system DC voltage by means of the charging device and to provide the first system DC voltage at the accumulator terminal for charging the accumulator and at the load terminal for operating the at least one high-voltage load.

[0020] In at least one advantageous embodiment according to the first aspect, the set of operating modes includes a fourth operating mode, and the charging arrangement is configured to provide, in the fourth operating mode, a second DC charging voltage, equal to the second system DC voltage, at the AC voltage terminal of the charging device and to keep the load terminal free from being supplied with the second system DC voltage, and to provide the first system DC voltage at the load terminal and the accumulator terminal by means of the charging device. This has the advantage that, if the accumulator is not switchable, the accumulator can be charged via the charging device, which converts the second system DC voltage into the first system DC voltage. The charging device can, in particular, It can be used as an emergency charger with lower charging power (approx. 10 to 25 kW) to prevent the vehicle from breaking down when the battery has a very low charge level and the nearest suitable (800 V) DC charging station is far from the vehicle's current location.

[0021] In at least one advantageous embodiment according to the first aspect, the charging device comprises a power converter with an input and an output. The input of the power converter is electrically connected to the AC terminal of the charging device, and the power converter is configured to convert an AC voltage applied to its input into a DC voltage and provide it at its output. The power converter is thus configured to operate as a rectifier. Furthermore, the charging device comprises a DC-DC converter. The DC-DC converter has a primary converter terminal that is electrically connected to the output of the power converter and a secondary converter terminal that is electrically connected to the DC terminal of the charging device.The DC-DC converter is designed to perform a DC-DC conversion between the primary converter side and the secondary converter side.

[0022] The charging device is thus designed, particularly in the second operating mode and / or the fourth operating mode, to provide the second system DC voltage at the primary converter side of the DC voltage converter and to convert the second system voltage provided at the primary converter side into the first system DC voltage and to provide the first system DC voltage at the secondary converter side.

[0023] In at least one advantageous embodiment, the primary converter side is galvanically isolated from the secondary converter side.

[0024] Advantageously, this allows the insulated charging device, which can be used in particular as a 400V / 800V DC booster for the 800V auxiliary units during 400V DC charging, to easily separate the AC side from the DC side, meeting the specified high-voltage safety requirements of relevant standards, e.g., ISO / FDIS 5474-3, section 6.2.2.302.

[0025] In at least one advantageous embodiment according to the first aspect, the connection arrangement comprises: - a first connection path between a first charging point of the charging port and a first connection node, wherein a controllable first disconnecting device is arranged in the first connection path, - a second connection path between a second charging point of the charging port and a second connection node, wherein a controllable second disconnecting device is arranged in the second connection path, - a third connection path between a first load connection point of the load connection and the first connection node, wherein a controllable third disconnecting device is arranged in the third connection path - a fourth connection path between a second load connection point of the load connection and the second connection node, wherein a controllable fourth disconnecting device is arranged in the fourth connection path, - a fifth connection path between the first charging connection point and a first connection point of the AC voltage connection of the charging device, - a sixth connection path between the second charging terminal and a second connection point of the AC voltage connection of the charging device, - a seventh connection path between the first connection node and a first accumulator connection point of the accumulator connection, - an eighth connection path between the second connection node and a second accumulator connection point of the accumulator connection.

[0026] In particular, the seventh connection path connects the first connection node directly to the first accumulator connection point via an electrical conductor, and the eighth connection path connects the second connection node directly to the second accumulator connection point via an electrical conductor.

[0027] In at least one advantageous embodiment according to the first aspect, the fifth connection path has a fifth isolating device and the sixth connection path has a sixth isolating device. This makes it possible to disconnect / isolate a primary side of the charging device during a charging process with the first system DC voltage, thus keeping the costs for isolation low or eliminating the need for additional effort for 1000V DC isolation.

[0028] According to a second and third aspect, the problem is solved by a method and a corresponding control device for a charging arrangement as described in the first aspect. The control device receives a first measurement signal or first measurement data, preferably from a voltage sensor, which is / are representative of a voltage applied to the charging terminal. Depending on the first measurement signal or the first measurement data, the control device selects an operating mode for the charging arrangement from the set of operating modes and controls the charging arrangement according to the selected operating mode.

[0029] In at least one advantageous embodiment according to the second and third aspects, a change in the accumulator configuration, in particular a switching of the accumulator, is initiated depending on received and / or stored accumulator configuration information. Preferably, in the second operating mode, a switching of the accumulator is initiated so that it can be charged with the second system DC voltage. In particular, the switching can cause the accumulator modules of the accumulator to be connected in parallel.

[0030] In at least one advantageous embodiment according to the second and third aspects, one operating mode is additionally selected depending on received and / or stored accumulator configuration information. In particular, the control device can decide, depending on the accumulator configuration information, whether to select the second operating mode or the fourth operating mode.

[0031] In at least one advantageous embodiment, in the third operating mode, an overvoltage diagnostic threshold for the charging device is determined or adjusted depending on the amplitude of the detected alternating voltage. Preferably, the charging device is designed such that the overvoltage diagnostic threshold of the charging device is adjustable within a predetermined range, for example between 200 V and 320 V, and in particular between 260 V and 305 V.

[0032] In at least one advantageous embodiment according to the second and third aspects, the first operating mode comprises controlling the separating devices such that the first separating device, the second separating device, the third separating device, and the fourth separating device are each in a closed state, and the fifth and sixth separating devices are in an open state. The second operating mode comprises controlling the separating devices such that the third and fourth separating devices are in an open state, and the first, second, fifth, and sixth separating devices are in a closed state.The third operating mode includes controlling the separating devices so that the third separating device, the fourth separating device, the fifth separating device and the sixth separating device are in a closed state, and the first separating device and the second separating device are in an open state.

[0033] In at least one advantageous embodiment according to the second and third aspects, the fourth operating mode comprises controlling the separating devices such that the first separating device and the second separating device are in an open state, and the third separating device, the fourth separating device, the fifth separating device and the sixth separating device are in a closed state.

[0034] Advantageous designs according to the first aspect also apply to the second and third aspects.

[0035] The task is solved according to a fourth aspect by a charging system that includes a charging arrangement according to the first aspect and a control device according to the third aspect.

[0036] Advantageous designs according to the first and third aspects also apply to the fourth aspect.

[0037] The task is solved according to a fifth aspect by a vehicle electrical system that includes a charging system according to the fourth aspect and an accumulator connected to the accumulator port of the charging arrangement.

[0038] The task is solved according to a sixth aspect by a computer program comprising instructions which, when executed by a control computer for a loading arrangement according to the first aspect, cause the control computer to execute the procedure according to the second aspect. Advantageous embodiments according to the first and second aspects also apply to the sixth aspect.

[0039] For the purposes of this document, the mention of such a computer program is synonymous with the term program element and / or software module and / or computer program product containing instructions for controlling the control computer in order to coordinate the operation of the system or method in a suitable manner in order to achieve the effects associated with the method according to the invention.

[0040] The control computer has a processor and program memory. Alternatively, the program memory can be assigned to the control computer. The processor can be a central processing unit (CPU). The processor can be a general-purpose processor, a microprocessor, a microcontroller, or a digital signal processor (DSP).

[0041] The task is solved according to a seventh aspect by a computer-readable medium comprising instructions which, when the program is executed by a control computer for a loading arrangement according to the first aspect, cause the control computer to execute the procedure according to the second aspect. Advantageous embodiments according to the first and second aspects also apply to the seventh aspect.

[0042] The computer program can be stored on a computer-readable storage medium (CD-ROM, DVD, Blu-ray Disc, removable drive, volatile or non-volatile memory, in particular random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), and / or flash memory). The storage medium can be memory integrated into the processor, memory located outside the processor on a circuit board, or portable storage. The memory is configured to store associated program instructions and related data.

[0043] Exemplary embodiments of the invention are explained in more detail below with reference to the schematic drawings. The description of the items mentioned here is not limited to the individual specific embodiments. Features of different exemplary embodiments can be combined with one another—where technically feasible—to form further exemplary embodiments. For example, variations or modifications described with regard to one of the exemplary embodiments may also be applicable to other exemplary embodiments, unless otherwise stated. Fig. Figure 1 shows an exemplary block diagram of an embodiment of a loading arrangement and Fig. Figure 2 shows an example flowchart for a program to operate the loading arrangement.

[0044] In the figures, the same reference symbols are used for elements with essentially the same function; however, these elements do not have to be identical in every detail.

[0045] In embodiments described herein or shown in the drawings, any direct electrical connection or coupling, i.e., any connection or coupling without any additional intervening elements, may also be implemented by an indirect connection or coupling, i.e., a connection or coupling with one or more intervening elements, or vice versa, as long as the general purpose of the connection or coupling, for example, the transmission of a certain type of signal or the transmission of a certain type of information, is essentially maintained.

[0046] Fig. Figure 1 shows an exemplary block diagram of an embodiment of a charging arrangement CA for a vehicle, as well as an external charging device SE connected to the charging arrangement CA and an accumulator HV-ACC connected to the charging arrangement CA. The accumulator HV-ACC is preferably a high-voltage accumulator. The accumulator HV-ACC is configured to supply a high-voltage vehicle electrical system with a first system DC voltage, in particular with an 800 V DC voltage, and to be charged with the first system DC voltage.

[0047] An electric vehicle is preferably a purely battery-powered vehicle (Battery Electric Vehicle, BEV) that uses an electric motor as its sole source of propulsion. The term "electric vehicle" here refers not only to motor vehicles but to all electrically powered vehicles, such as industrial trucks or forklifts.

[0048] The HV-ACC battery can comprise multiple battery modules that can be connected in series and / or parallel. The HV-ACC battery can be configured, particularly when the battery modules are connected in series, to supply the high-voltage vehicle electrical system with the first DC system voltage and to be charged with the first DC system voltage. Furthermore, the HV-ACC battery can be configured, particularly when the battery modules are connected in parallel, to be charged with a second DC system voltage (for example, a 400V DC voltage).

[0049] The switchable HV-ACC accumulator makes it possible to do without a powerful 400V to 800V DC booster, e.g. with 150 kW.

[0050] An external charging device (SE) is, for example, an external vehicle charging station or charging column. Alternatively, an external charging device (SE) can be a mobile energy source, such as another electric vehicle.

[0051] The external charging device SE is designed to supply current to the electric vehicle. In particular, the external charging device SE is designed to provide at least one AC charging mode and / or at least one DC charging mode. In AC charging mode, the external charging device SE provides an alternating current which is converted into a corresponding DC charging current by the electric vehicle's charging device OBC, also known as the on-board charger (OBC).

[0052] In at least one DC charging mode, the external charging device SE provides a direct current. In this DC charging mode, the external charging device SE is specifically designed to set and maintain charging parameters, particularly charging current and voltage, as required or desired for charging the connected vehicle. The corresponding external charging device SE is then responsible for maintaining these charging parameters.

[0053] The external charging device SE is, for example, designed to perform AC charging and / or DC charging in accordance with the North American Charging Standard (SAE J3400). This means that the external charging device SE is designed to meet the general physical, electrical, functional, safety, and performance requirements of the North American Charging Standard (SAE J3400) for conductive energy transfer to the electric vehicle using a hand-connected plug, and to transmit either DC or single-phase AC using two live contacts.

[0054] The charging arrangement CA comprises a charging port CP, a battery port, and a load port LP. Furthermore, the charging arrangement CA includes a vehicle-side charging device OBC and a connection assembly.

[0055] The charging arrangement CA is specifically designed to charge the HV-ACC battery of the electric vehicle via a NACS charging connection system. The charging connection CP preferably includes a charging socket according to NACS. The charging connection CP is thus configured for connection to a single-phase AC power source and for connection to a DC power source in order to charge the HV-ACC battery via the connected external power source (charging device).

[0056] The vehicle-side charging device OBC is configured to convert an alternating voltage applied to an AC voltage connection of the charging device OBC into a first system DC voltage and to provide the first system DC voltage at a DC voltage connection of the charging device OBC. Furthermore, the charging device OBC is configured to convert a charging DC voltage applied to the AC voltage connection into the first system DC voltage and to provide the first system DC voltage at the DC voltage connection.

[0057] The OBC charging device can have a primary and a secondary side. In this case, the primary side of the OBC charging device is electrically connected to the CP charging terminal. The secondary side of the OBC charging device can be electrically connected to the HV-ACC battery. As explained in more detail below, the primary and secondary sides of the OBC charging device are galvanically isolated from each other by a DC-DC converter, thus ensuring electrical isolation between the two sides.

[0058] The charging device OBC, for example, comprises a power converter having an input side and an output side, the input side of the power converter being electrically connected to the AC voltage terminal of the charging device OBC. The power converter is configured to convert an AC voltage applied to its input side into a DC voltage and provide it at its output side. The power converter 16, for example, includes a power factor correction circuit (PFC circuit).

[0059] Furthermore, the charging device OBC comprises, for example, a DC-DC converter with a primary converter side that is electrically connected to the output side of the power converter and a secondary converter side that is electrically connected to the DC side of the charging device OBC. The DC-DC converter is configured to perform a DC-DC conversion between the primary and secondary converter sides. The DC-DC converter is electrically connected to the power converter, particularly to its output side, preferably via an intermediate circuit with one or more intermediate circuit capacitors. The DC-DC converter is, for example, designed to be insulated. That is, the primary converter side is galvanically isolated from the secondary converter side.

[0060] The connection arrangement comprises a plurality of electrical connection paths L1, ..., L8 to provide a set of operating modes, each of which has a controllable isolating device IS1, ..., IS6, wherein the respective isolating devices IS1, ..., IS6 are configured to establish and break the electrically conductive connection of the respective connection path L1, ..., L8.

[0061] The charging port CP of the charging arrangement CA comprises a first charging port CP1 and a second charging port CP2. The battery port has a first battery port ACC1 and a second battery port ACC2. The AC port of the charging device OBC comprises a first AC port AC1 and a second AC port AC2. The DC port of the charging device OBC comprises a first DC port DC1 and a second DC port DC2.

[0062] The connection arrangement has a first connection path L1, which is arranged between the first charging point CP1 of the charging port CP and a first connection node VK1, and a second connection path L2, which is arranged between the second charging point CP2 of the charging port CP and a second connection node VK2.

[0063] In the first connection path L1, a controllable first disconnect device IS1 is arranged, and in the second connection path L2, a controllable second disconnect device IS2 is arranged. The first and second disconnect devices IS1 and IS2, for example, form the DC charging contactors of the charging arrangement CA, which are closed when the charging arrangement CA is connected to an external DC charging source. This allows the charging terminal CP to be connected to the battery HV-ACC on all poles and to be disconnected from the battery HV-ACC on all poles.

[0064] The connection arrangement comprises a third connection path L3, which is arranged between the first DC voltage connection point DC1 of the charging device OBC or a first load connection point LP1 and the first connection node VK1, and a fourth connection path L4, which is arranged between the second DC voltage connection point DC2 of the charging device OBC or a second load connection point LP2 and the second connection node VK2. A controllable third disconnect device IS3 is arranged in the third connection path L3, and a controllable fourth disconnect device IS4 is arranged in the fourth connection path L4.

[0065] The third and fourth disconnect devices, IS3 and IS4, are, for example, the battery contactors. These contactors serve to disconnect / connect, in particular to disconnect / connect all poles of the HV-ACC battery from / to the high-voltage loads HV-AUX, especially the high-voltage auxiliary units, of the vehicle. This makes it possible to disconnect the HV-ACC battery all poles from the load terminal LP and the DC terminal of the charging device OBC, and thus from at least one high-voltage load HV-AUX and from the charging device OBC.

[0066] The charging arrangement CA includes a fifth connection path L5, which is arranged between the first charging terminal CP1 and the first terminal AC1 of the AC terminal of the charging device OBC, and a sixth connection path L6, which is arranged between the second charging terminal CP2 and the second terminal AC2 of the AC terminal of the charging device OBC.

[0067] Preferably, the fifth connection path L5 comprises a fifth isolating device IS5 and the sixth connection path L6 comprises a sixth isolating device IS6 in order to meet specified insulation and high-voltage safety requirements. The fifth isolating device IS5 and the sixth isolating device IS6 are, for example, each configured as a relay.

[0068] Furthermore, the charging arrangement CA has a seventh connection path L7, which is located between the first connection node VK1 and the first accumulator connection point ACC1, and an eighth connection path L8, which is located between the second connection node VK2 and the second accumulator connection point ACC2.

[0069] The CA loading arrangement is controlled, for example, by means of a control device (not shown in Fig. 1) operated. The charging arrangement CA and the control device thus form a charging system.

[0070] The control device is specifically configured to receive a first measurement signal representative of a voltage applied to the charging port CP. Alternatively, the control device can be configured to receive first measurement data representative of a voltage applied to the charging port CP. The measurement signal or data can be provided by a voltage sensor.

[0071] The control device is designed, for example, to determine an amplitude and a voltage waveform of the charging voltage depending on the first measurement signal or the first measurement data, and to detect whether a first system DC voltage or a second system DC voltage or a first AC voltage or a second AC voltage is present at the charging terminal CP.

[0072] The control device is configured to select an operating mode for the charging arrangement CA from a set of predefined operating modes, depending on the first measurement signal or the first measurement data, and to control the charging arrangement CA according to the selected operating mode. In particular, the control device is configured to directly or indirectly control the disconnecting devices IS1, ..., IS6 of the connection arrangement according to the selected operating mode.

[0073] The control device is optionally designed to additionally select the operating mode and / or initiate a change in the accumulator configuration depending on received and / or stored accumulator configuration information.

[0074] The charging arrangement CA is configured, for example, to provide a first system DC voltage, such as a DC voltage of 800 V, supplied by an external charging device SE, to the battery terminal for charging the battery, and the first system DC voltage to the load terminal LP for operating at least one high-voltage load, in the first operating mode. The first operating mode is selected when the charging arrangement CA is connected to an external charging device SE that provides a DC charging voltage corresponding to the vehicle's first system DC voltage. The first system DC voltage is thus present at the charging terminal CP. In this case, the battery modules of the HV-ACC battery are preferably connected in series so that the HV-ACC battery can be charged with the first system DC voltage.

[0075] The charging arrangement CA is further configured to provide a second DC system voltage, e.g., a DC voltage of 400 V, supplied by an external charging device SE, to the battery terminal for charging the HV-ACC battery, while keeping the load terminal LP free from being supplied with the second DC system voltage. Additionally, the first DC system voltage is supplied to the load terminal LP by means of the charging device OBC. The second operating mode is selected when the charging arrangement CA is connected to an external charging device SE that provides a DC charging voltage corresponding to a second DC system voltage of the vehicle, e.g., 400 V DC. The second DC system voltage, which is lower than the first DC system voltage, is thus present at the charging terminal CP.The battery modules of the HV-ACC battery are, or preferably are, connected in parallel in this case, so that the HV-ACC battery can be charged with the second system DC voltage. In the second operating mode, the high-voltage auxiliary units or the high-voltage loads HV-AUX, which are connected to the load terminal LP, are supplied by the connected charging station via the charging device OBC, which provides the first system DC voltage, and the HV-ACC battery is charged with the second system DC voltage.

[0076] The charging arrangement CA is further configured, in the third operating mode, to convert an AC voltage supplied by a stationary charging device SE into the first system DC voltage and to make it available at the battery terminal for charging the battery HV-ACC and at the load node for operating at least one high-voltage load. In the third operating mode, the supply voltage required to power the high-voltage loads HV-AUX connected to the load terminal LP, which is equal to the first system DC voltage, is provided via the boost function of the charging device OBC. The charging device OBC is configured to convert a first AC voltage applied to its input, for example, a 240 V AC voltage, into the first system DC voltage and to make it available at its output.Furthermore, the charging device is designed to convert a second AC voltage applied to its input, for example a 270 V AC voltage, into the first system DC voltage and make it available at its output. The high-voltage auxiliary units or the high-voltage loads HV-AUX, which are connected to the load terminal LP, and the battery HV-ACC are supplied or charged by the connected charging station via the charging device OBC, which provides the first system DC voltage.

[0077] The control device includes, for example, a control computer which provides, in particular, the control signals for driver circuits of the isolating devices IS1, ..., IS6 and the charging device OBC and, for example, for the accumulator HV-ACC.

[0078] Fig. Figure 2 shows an example flowchart for a program that is executed by the control computer of the loading arrangement CA.

[0079] The program is started in step S01. In step S01, for example, the program variables are initialized.

[0080] The program is started, for example, when a charging port (CPD) on the vehicle is opened and / or it detects that a charging plug is inserted. The opening of the charging port (CPD) and / or the insertion of the charging plug can be signaled to the control computer by a charging port controller (CPC), for example.

[0081] In step S03, for example, the first measurement data is read in and evaluated.

[0082] In step S05, an operating mode is selected from the set of operating modes.

[0083] For example, if it is detected that the charging port CP is connected to an external charging device that provides an initial system DC voltage, the first operating mode is selected for controlling the charging arrangement CA.

[0084] If step S05 detects that the charging port CP is connected to an external charging device that provides a second system DC voltage, the program continues in step S07b.

[0085] If step S05 detects that the charging port CP is connected to an external charging device that provides an initial AC voltage, the third operating mode is selected for controlling the charging arrangement CA.

[0086] If the first operating mode is selected in step S05, a current accumulator configuration is verified in step S07a. For example, depending on the received and / or stored accumulator configuration information, it is checked whether the HV-ACC accumulator is configured to be charged with the first system DC voltage, e.g., 800V. The switching state of the switches used to change the HV-ACC accumulator (parallel / series operation) is also checked. If it is detected that the accumulator modules are connected in parallel, a switch to a series connection is performed or initiated.

[0087] In step S09a, the third isolating device IS3 and the fourth isolating device IS4 are controlled such that they are in a closed state. Preferably, the high-voltage DC network is pre-charged.

[0088] In step S11a, preferably the fifth separating device IS5 and the sixth separating device IS6 are controlled such that they have an open state.

[0089] In step S13a, the first separating device IS1 and the second separating device IS2 are controlled in such a way that they have a closed state.

[0090] If, however, step S05 detects that the charging port CP is connected to a vehicle charging station providing the second system DC voltage, step S07b verifies the battery configuration. For example, depending on received and / or stored battery configuration information, it is checked whether the HV-ACC battery is configured to be charged with the second system DC voltage, e.g., 400V. If it is detected that the HV-ACC battery can be charged with the second system DC voltage (i.e., switchable to parallel operation), the second operating mode is selected; otherwise, the fourth operating mode is selected. If the second operating mode is selected, a switchover of the battery modules to a parallel connection may be performed or initiated, depending on the current battery configuration. If the second operating mode is selected in step S07b, the third isolating device IS3 and the fourth isolating device IS4 are controlled in step S09b so that they are in an open state. In step S11b, the fifth isolating device IS5 and the sixth isolating device IS6 are controlled so that they are in a closed state, and in step S13b, the first isolating device IS1 and the second isolating device IS2 are controlled so that they are in a closed state.

[0091] If the fourth operating mode is selected in step S07b, the third isolating device IS3 and the fourth isolating device IS4 are controlled in step S09c so that they are in a closed state. In step S11c, the fifth isolating device IS5 and the sixth isolating device IS6 are controlled so that they are in a closed state. In step S13c, the first isolating device IS1 and the second isolating device IS2 are controlled so that they are in an open state.

[0092] If the third operating mode is selected in step S05, step S07d checks whether the detected AC voltage corresponds to a first AC voltage, for example, 240 V AC, or a second AC voltage, for example, 277 V AC. If the second AC voltage is detected, the overvoltage diagnostic threshold of the charging device (OBC) is preferably adjusted. The overvoltage diagnostic threshold is, for example, 1.1 times the charging AC voltage. If the first AC voltage is detected, the overvoltage diagnostic threshold is set to, for example, 240 V AC * 1.1 = 264 V AC. If, on the other hand, the second AC voltage is detected, the overvoltage diagnostic threshold is set to, for example, 277 V AC * 1.1 = 304.7 V AC.

[0093] In step S09d, the third separating device IS3 and the fourth separating device IS4 are controlled in such a way that they have a closed state.

[0094] Preferably, the high-voltage direct current network is pre-charged.

[0095] In step S11d, the fifth separating device IS5 and the sixth separating device IS6 are controlled in such a way that they have a closed state.

[0096] In step S13c, the first separating device IS1 and the second separating device IS2 are controlled in such a way that they have an open state.

[0097] In step S15, for example, if the HV-ACC accumulator is charged or the charging of the HV-ACC accumulator is aborted for any reason, the program is terminated and the disconnect devices IS1, ..., IS6 of the charging arrangement CA are moved to a predetermined switching position. Reference symbol list AC1, AC2 first and second AC voltage connection point of the charging device ACC1, ACC2 first and second accumulator connection point CA loading arrangement CP charging port CP1, CP2 first and second charging point CPC charging port controller CPD charging flap DC1, DC2 first and second DC voltage connection point of the charging device HV second high-voltage potential HV+ first high-voltage potential HV-ACC accumulator HV-AUX High-voltage load IS1, ..., IS6 controllable disconnect device L1, L2 first and second connection path L3, L4 third and fourth connecting path L5, L6 fifth and sixth connecting path L7, L8 seventh and eighth connection path LP load connection LP1, LP2 first and second load connection point OBC charging device S01, ..., S15 Program steps SE Energy source VK1, VK2 first and second connection node

Claims

[1] Charging arrangement (CA) for an accumulator (HV-ACC) of an electrically powered vehicle, wherein the charging arrangement (CA) comprises: - a charging port (CP) - a rechargeable battery connection (ACCP) - a vehicle-side charging device (OBC) with an AC voltage connection and a DC voltage connection, wherein the charging device (OBC) is designed, - -to convert an alternating voltage applied to the AC voltage terminal into a first system DC voltage and to provide the first system DC voltage at the DC voltage terminal and - - to convert a charging DC voltage applied to the AC voltage connection into the first system DC voltage and to provide the first system DC voltage at the DC voltage connection, - a load connection (LP) that is set up for electrical connection to at least one high-voltage load (HV-AUX) of the vehicle and that is connected to the DC connection of the charging device (OBC), - a connection arrangement comprising electrical connection paths (L1, ..., L8) with controllable disconnecting devices (IS1, ..., IS6) for establishing and interrupting respective electrical connections of the connection paths (L1, ..., L8) to provide a set of operating modes for the charging arrangement (CA), wherein the set includes a second operating mode and the charging arrangement (CA) is configured in the second operating mode to provide a second DC charging voltage, equal to a second DC system voltage, at the accumulator terminal (ACCP) for charging the accumulator (HV-ACC) and at the AC terminal of the charging device (OBC), and to keep the load terminal (LP) free from being supplied with the second DC system voltage, and by means of the charging device (OBC) to provide the first DC system voltage at the load terminal (LP), wherein the first DC system voltage is greater than the second DC system voltage. [2] Charging arrangement (CA) according to claim 1, wherein the set of operating modes further comprises a first operating mode and / or a third operating mode and / or a fourth operating mode and the charging arrangement (CA) is configured, - in the first operating mode, to provide a first DC charging voltage, equal to the first system voltage, at the battery terminal (ACCP) for charging the battery (HV-ACC) and at the load terminal (LP) for operating at least one high-voltage load (HV-AUX), - in the third operating mode, to convert an alternating voltage provided at the charging port (CP) into the first system DC voltage by means of the charging device (OBC) and to provide the first system DC voltage at the accumulator port (ACCP) for charging the accumulator (HV-ACC) and at the load port (LP) for operating at least one high-voltage load (HV-AUX), - in the fourth operating mode, to provide a second DC charging voltage, equal to the second system DC voltage, at the AC voltage terminal of the charging device (OBC) and to provide the first system DC voltage at the load terminal (LP) and the accumulator terminal (ACCP) via the charging device (OBC). [3] Charging arrangement (CA) according to claim 1 or 2, wherein the charging device (OBC) comprises: - a power converter having an input side and an output side, wherein the input side of the power converter is electrically connected to the AC voltage connection of the on-board charger (OBC) and the power converter is configured to convert an AC voltage applied to its input side into a DC voltage and to provide it at its output side, and - a DC-DC converter comprising a primary converter side electrically connected to the output side of the converter and a secondary converter side electrically connected to the DC side of the on-board charger (OBC), wherein the DC-DC converter is configured to perform a DC-DC conversion between the primary converter side and the secondary converter side. [4] Charging arrangement (CA) according to claim 3, wherein the primary converter side is galvanically isolated from the secondary converter side. [5] Charging arrangement (CA) according to any of the preceding claims, wherein the connection arrangement comprises: - a first connection path (L1) between a first charging connection point (CP1) of the charging connection (CP) and a first connection node (VK1), wherein a controllable first disconnecting device (IS1) is arranged in the first connection path (L1), - a second connection path (L2) between a second charging point (CP2) of the charging point (CP) and a second connection node (VK2), wherein a controllable second disconnecting device (IS2) is arranged in the second connection path (L2), - a third connection path (L3) between a first DC connection point (DC1) of the charging device (OBC) and the first connection node (VK1), wherein a controllable third disconnecting device (IS3) is arranged in the third connection path (L3), - a fourth connection path (L4) between a second DC terminal (DC2) of the charging device (OBC) and the second connection node (VK2), wherein a controllable fourth disconnect device (IS4) is arranged in the fourth connection path (L4), - a fifth connection path (L5) between the first charging terminal (CP1) and a first connection point (AC1) of the AC terminal of the charging device (OBC), - a sixth connection path (L6) between the second charging terminal (CP2) and a second terminal (AC2) of the AC terminal of the charging device (OBC), - a seventh connection path (L7) between the first connection node (VK1) and a first accumulator connection point (ACC1) of the accumulator connection (ACCP), - an eighth connection path (L8) between the second connection node (VK2) and a second accumulator connection point (ACC2) of the accumulator connection (ACCP). [6] Charging arrangement (CA) according to claim 5, wherein a fifth controllable disconnect device (IS5) is arranged in the fifth connection path (L5) and a controllable sixth disconnect device (IS6) is arranged in the sixth connection path (L6). [7] Method for operating a charging arrangement (CA) according to any one of claims 1 to 6, wherein the method comprises the following steps: - Receiving an initial measurement signal or initial measurement data that is / are representative of a voltage applied to the charging port (CP), - depending on the first measurement signal or the first measurement data, selection of an operating mode for the charging arrangement (CA) from the set of operating modes, - Controlling the charging arrangement (CA) according to the selected operating mode. [8] Method according to claim 7, wherein, depending on a received and / or stored accumulator configuration information, an operating mode is selected and / or a change in the accumulator configuration is initiated. [9] Method according to claim 7 or 8, wherein - the first operating mode includes controlling the isolating devices (IS1, ..., IS6) so that the first isolating device (IS1), the second isolating device (IS2), the third isolating device (IS3) and the fourth isolating device (IS4) each have a closed state and the fifth isolating device (IS5) and the sixth isolating device (IS6) each have an open state, - the second operating mode includes controlling the isolating devices (IS1, ..., IS6) so that the third isolating device (IS3) and the fourth isolating device (IS4) are each in an open state, and the first isolating device (IS1), the second isolating device (IS2), the fifth isolating device (IS5) and the sixth isolating device (IS6) are each in a closed state, - the third operating mode includes controlling the isolating devices (IS1, ..., IS6) so that the third isolating device (IS3), the fourth isolating device (IS4), the fifth isolating device (IS5) and the sixth isolating device (IS6) each have a closed state, and the first isolating device (IS1) and the second isolating device (IS2) each have an open state. [10] Method according to one of claims 7 to 9, wherein in the third operating mode an overvoltage diagnostic threshold for the charging device (OBC) is determined depending on an amplitude of the detected alternating voltage. [11] Control device for a charging arrangement (CA) according to any one of claims 1 to 6, which is configured to perform the method according to any one of claims 7 to 10. [12] Charging system for an accumulator (HV-ACC) of an electrically powered vehicle, wherein the charging system comprises a charging arrangement (CA) according to any one of claims 1 to 6 and a control device according to claim 11. [13] Computer program comprising instructions which, when the program is executed by a control computer for a loading arrangement (CA) according to any one of claims 1 to 6, cause the control computer to execute the method according to any one of claims 7 to 10. [14] Computer-readable medium comprising instructions which, when executed by a control computer for a charging arrangement (CA) according to any one of claims 1 to 6, cause the control computer to execute the method according to any one of claims 7 to 10.

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