Charging device and method of operating the charging device

Abstract

A charging device for a vehicle, the charging device (500) including an input terminal unit (100) for connecting a single-phase or three-phase AC voltage on the input side, a PFC stage (200) for providing a DC voltage to an intermediate terminal (300), and a two-pole AC voltage terminal (400) for providing an AC voltage.

Description

Technical Field

[0001] The present invention relates to a charging device and a method for operating the charging device. Furthermore, the present invention relates to a power train including the charging device, a vehicle including the power train, as well as a computer program and a machine-readable memory medium.

Background Art

[0002] For example, within a vehicle equipped with an electric drive unit, a charging device in an electric vehicle or a hybrid vehicle is used to recharge a battery, preferably a storage battery or a traction battery, from an electrical energy source, preferably an external alternating current source or a public alternating current network. For this purpose, the charging device converts the sinusoidal alternating current of the external energy source into a direct current. In the case of single-phase alternating current, the power pulsates at twice the frequency of the alternating current.

[0003] The charging device preferably has two-stage power electronics. The first stage, the so-called power factor correction stage, the PFC stage, converts the sinusoidal input voltage from the alternating voltage network into a direct voltage. The second stage consists of a direct voltage converter or a DC / DC converter, which ensures galvanic insulation by means of a transformer and adapts the voltage level. Preferably, the output voltage and / or the output current are adjusted for battery charging by means of an electrical circuit and a regulator. An intermediate circuit capacitor for buffering the power pulsation at twice the frequency of the alternating current of the energy source is arranged between both stages. This intermediate circuit is typically realized by at least one electrolytic capacitor. This topology makes it possible to maintain a substantially sinusoidal input current on the network side to meet the network-side standards, to provide galvanic insulation between the network and the vehicle to meet safety requirements, and to provide a constant output direct current on the battery side to minimize the load on the battery during the charging operation.

[0004] In vehicles equipped with an electric drive unit, the battery is further coupled to an inverter to supply energy to the electric drive machinery. A DC voltage converter is connected in parallel to this inverter to supply energy to the vehicle's low-voltage network or onboard network for use with control equipment. It is known that inverters connected to the onboard network are used to generate AC voltage to supply energy to AC voltage outlets within the vehicle. These AC voltage outlets are provided to operate household consumer appliances within the vehicle. Examples of household consumer appliances include media players, computers, mobile device chargers, iceboxes, or coffee makers. [Overview of the project] [Problems that the invention aims to solve]

[0005] As a result, many voltage converters within a vehicle are difficult to implement and require a lot of space. Therefore, there is a need for a simple, compact, and efficient solution to provide the required voltages. [Means for solving the problem]

[0006] A charging device for vehicles, A charging device is provided, which includes a preferably three-phase input terminal unit for connecting single-phase to three-phase AC voltages at the input side, a PFC stage for providing a DC voltage to the intermediate terminals, and a two-pole AC voltage terminal for providing an AC voltage. The PFC stage includes first, second, and third half-bridges. The first, second, and third half-bridges each include a series circuit with a high-side switch and a low-side switch. The intermediate taps between the high-side and low-side switches of the half-bridges can each be coupled to the first, second, and third input terminals of the preferably three-phase input terminal unit, respectively, via first, second, and third choke coils, respectively, via first, second, and third connecting conductors, respectively. Thus, the intermediate tap of the first half-bridge can be coupled to the first input terminal via the first choke coil and a first connecting conductor. Thus, the intermediate tap of the second half-bridge can be coupled to the second input terminal via the second choke coil and a second connecting conductor. Therefore, the center tap of the third half-bridge can be coupled to the third input terminal via a third choke coil and a third connecting conductor. These half-bridges are connected in parallel, and their ends are coupled to the two-pole center terminals. The high-side switch is coupled to the positive center terminal of the two-pole center terminals, and the low-side switch is coupled to the negative center terminal. This charging device includes a fourth half-bridge connected in parallel to the first, second, and third half-bridges. The fourth half-bridge includes a high-side switch and a low-side switch, and the center tap between the high-side and low-side switches of the fourth half-bridge is switchably coupled to the second AC voltage terminal of the two-pole AC voltage terminals via a sixth switching element. The fourth switching element, preferably a fourth switching contact, is provided and is adapted to establish coupling between the third half-bridge and the first AC voltage terminal of the two-pole AC voltage terminals via a third choke coil or coupling between the third half-bridge and the third connecting conductor to the third input terminal via a third choke coil.It is further advantageous that a fourth switching element can be used to disconnect the third connecting conductor from the PFC stage and therefore from the first and second capacitors. This preferably ensures that the third connecting conductor is coupled to the PFC stage only after the first and second capacitors have been charged. Therefore, it is preferable that the starting current when the third connecting conductor is connected is blocked. It is also preferable to eliminate the pre-charge resistance between the third input terminal and the third connecting conductor.

[0007] When the two AC voltage terminals are operating, it is preferable that the electrical energy applied to the intermediate terminals is supplied to the two AC voltage terminals. The electrical energy at the intermediate terminals is preferably supplied from an external energy source or infrastructure or EVSE (electric vehicle power supply system) via the input terminal unit and PFC stage, or from a battery connected to the charging equipment, preferably the vehicle's traction battery, via a bidirectional DC / DC converter connected to the intermediate terminals.

[0008] To provide two AC voltage terminals capable of providing an adjustable AC voltage, a fourth half-bridge is added to the PFC stage of the charging device, the center tap of this fourth half-bridge leading to a second AC voltage terminal. The first AC voltage terminal is coupled to the center tap of the third half-bridge of the PFC stage via a third choke coil of the PFC stage. It is advantageous to provide a circuit for the charging device that enables the provision of an adjustable AC voltage to the two AC voltage terminals. The provision of the AC voltage may occur during the charging process for charging the battery by the charging device. It is preferable that the DC voltage at the center terminals is converted to a desired AC voltage by the third and fourth half-bridges. It is also preferable that the charging device can influence the voltage and current at the consuming device connected to the two AC voltage terminals even during the battery charging process. It is preferable that overloading of external energy sources can be prevented by the proper opening of the high-side and low-side switches of the third and fourth half-bridges and the subsequent switching off of the connected consuming device. In the event of a short circuit, it is preferable that the charging equipment and / or connected consuming equipment be protected by an overcurrent shutdown.

[0009] The external energy source is preferably a public low-voltage network, preferably a single-phase, two-phase, or three-phase AC voltage network. This is preferably a 120 or 240-volt single-phase AC voltage network in North America or Japan. This is preferably a 230-volt three-phase AC voltage network in China or Europe. For the charging operation of the charging equipment, the charging equipment is coupled to or connected to a corresponding AC voltage network. The battery being charged is preferably a storage battery or traction battery, and its energy is used to operate the vehicle's electric powertrain. The rectifier circuit is preferably a rectifier for converting AC current to DC current. The high-side or low-side switch of the semiconductor bridge is preferably a power semiconductor switch including an intrinsic diode, preferably an IGBT or MOSFET based on Si, SiC, or GaN technology. For example, the expression coupling of a center tap and a connecting conductor preferably means the connection, contact, or coupling of components by a conductive wire or galvanic connection. The terms interruption, prevention, disconnection, or blocking of current flow mean separation of conductive wires or couplings. The term connection is preferably used synonymously with electrical coupling, and switchable coupling means that the electrical coupling is preferably establishable or separable by a switch or switching element. The term placement is preferably used to define the location of an electrical component, preferably a switch or switching element, within a circuit topology, which includes electrical coupling with adjacent electrical components.

[0010] In another configuration, the input terminal unit includes a neutral terminal. The first to fourth half-bridges are connected in parallel to a series circuit of first and second diodes. The first and second diodes are connected in reverse to prevent, interrupt, or block current flow from the positive center terminal to the negative center terminal and to allow current flow from the negative center terminal to the positive center terminal. The center tap between the first and second diodes is coupled to the neutral terminal via the neutral wire. These half-bridges are connected in parallel to a series circuit of first and second capacitors. A fifth switching element is also provided, which is adapted to couple a second choke coil, coupled on one hand to the second half-bridge, to the neutral wire, or to a second connecting conductor and a second input terminal.

[0011] A fifth switching element, preferably a fifth switching contact, is positioned between the second choke coil and the second connecting conductor. Therefore, depending on the open / closed state, the second choke coil is coupled to the neutral wire, or to the second connecting conductor and the second input terminal. It is advantageous in the input terminal unit to provide the possibility of supplying AC voltages to the first input terminal and the neutral wire terminal. Preferably, the DC voltage at the intermediate terminal is converted to a desired AC voltage by the first and second half-bridges and supplied as AC voltage to the first input terminal and the neutral wire terminal. The electrical energy at the intermediate terminal is preferably supplied from a battery connected to a charging device, preferably a vehicle traction battery, via a bidirectional DC / DC converter connected to the intermediate terminal.

[0012] In another embodiment of the present invention, the second connecting wire is divided into a first portion and a second portion. A second switching element is provided, which is positioned between the first portion and the second portion of the second connecting wire, and is adapted to guide a charging current from a second input terminal through the first and second portions of the second connecting wire to a second choke coil, or to guide a charging current from the first connecting wire through the second portion of the second connecting wire to a second choke coil.

[0013] A second switching element, preferably a second switching contact, is positioned between a first portion of the second connecting conductor and a second portion of the second connecting conductor. Therefore, depending on the open / closed state of the second switching element, the charging current is either led from the second input terminal through the first and second portions of the second connecting conductor to the second choke coil, or from the first connecting conductor through the second portion of the second connecting conductor to the second choke coil. It is advantageous to provide the possibility of partially branching the single-phase charging current flowing along the first connecting conductor and leading it through the second portion of the second connecting conductor to the second choke coil and the second half-bridge. This allows for a reduction in the load on the first choke coil and the first half-bridge, preferably when a single-phase charging current is present. The single-phase charging current is preferably generated when a single-phase AC voltage is connected to the input terminal. It is further advantageous that the first portion of the second connecting conductor can be isolated from the PFC stage and therefore from the first and second capacitors using the second switching element. This preferably means that the first portion of the second connecting wire is coupled to the PFC stage only after the first and second capacitors have been charged. Therefore, it is preferable that the starting current when the first portion of the second connecting wire is connected is prevented. It is preferable that the precharge resistance between the second input terminal and the first portion of the second connecting wire be eliminated. Based on the configuration of the second switching element as the second switching contact, it is preferable that a short circuit between the first connecting wire and the first portion of the second connecting wire is prevented. A short circuit between the first input terminal and the second input terminal may occur due to a poorly controlled simple switching element, and it is preferable that the second switching contact can reliably eliminate this error during control.

[0014] In another embodiment, a first switching element is provided, adapted to allow or interrupt current flow between a first input terminal and a first connecting conductor or a first choke coil of a PFC stage.

[0015] The first switching element is positioned between the first connecting wire and the first input terminal. Therefore, depending on the open / closed state, current flow or charging current from the first input terminal towards the first choke coil of the PFC stage is enabled or prevented. It is advantageous to have the possibility of interrupting or switching on the charging current through the first connecting wire. Preferably, a thermistor or NTC resistor used to limit the starting current is connected in parallel to the first switching element. The starting current preferably flows from the first input terminal through the PFC stage to the first and / or second capacitors. At low temperatures, the thermistor's resistance is high, which is preferable to reduce the starting current. After power-on, the thermistor heats up due to the current flow, losing its high initial resistance. To reduce thermistor loss, it is preferable to close the first switching element so that the thermistor is bypassed when the first and / or second capacitors are substantially charged.

[0016] In another embodiment, a third switching element is provided, adapted to enable or interrupt the charging current between the third input terminal and the third connecting conductor or the third choke coil of the PFC stage.

[0017] A third switching element is positioned between a third connecting wire and a third input terminal. Therefore, depending on the open / closed state, current flow or charging current from the third input terminal towards the third choke coil of the PFC stage is enabled or prevented. Preferably, when a three-phase charging current is present, it is advantageous to have the possibility of interrupting or switching on the charging current through the third connecting wire. Preferably, a thermistor or NTC resistor used to limit the starting current is connected in parallel to the third switching element. Preferably, the starting current flows from the third input terminal through the PFC stage to the first and / or second capacitors. At low temperatures, the thermistor's resistance is high, which is preferable to reduce the starting current. After power-on, the thermistor heats up due to the current flow, losing its high initial resistance. To reduce thermistor loss, it is preferable to close the third switching element so that the thermistor is bypassed when the first and / or second capacitors are substantially charged.

[0018] In another configuration, a seventh switching element is positioned between the center taps of the first and second diodes and between the center taps of the first and second capacitors. The seventh switching element is connected between the center taps of the first and second diodes and between the center taps of the first and second capacitors. Thus, depending on the open / closed state, current flow between the center taps of the series diode circuits and the series capacitor circuits is enabled or prevented. Preferably, when a two-phase or three-phase charging current is present, it is advantageous to have the possibility of interrupting or switching on the current flow between the center taps of the first and second diodes and between the center taps of the first and second capacitors. The seventh switching element is preferably closed to operate the charging equipment with an asymmetric load. An asymmetric load exists in the case of operation in a two-phase network, or in the case of an asymmetric load in operation in a three-phase network, i.e., in the case of two-phase or three-phase AC voltages. In these cases, the resulting current flows along the neutral line through the closed seventh switching element. In the case of a symmetric load, the AC voltages on the first, second, and third connecting conductors are of the same magnitude, and the phase difference between the AC voltages is 120 degrees each. In this case, the sum of the phase currents and the resulting current on the neutral wire are zero. In the case of an asymmetric load, the AC voltages on the first, second, and third connecting conductors are not all the same magnitude, and / or the phase difference between the AC voltages is not 120 degrees. In this case, the sum of the phase currents and the resulting current are not zero. When the switching element is closed, it is preferable to allow current flow to the neutral wire terminal through the neutral wire for this sum of currents.

[0019] In another embodiment, in order to provide electrical energy to two AC voltage terminals, the DC voltages provided to the positive and negative intermediate terminals are at least partially provided as AC voltages to the first and second AC voltage terminals, a fourth switching element establishes coupling from the center tap of the third half-bridge to the first AC voltage terminal via the third choke coil, and a sixth switching element establishes coupling from the center tap of the fourth half-bridge to the second AC voltage terminal.

[0020] It is advantageous that the fourth and sixth switching elements are connected to enable the provision of an adjustable AC voltage at the two-pole AC voltage terminals. The DC voltage at the intermediate terminal is converted to a desired AC voltage by the third and fourth half-bridges, preferably by filtering with a third choke coil and a fourth capacitor between the first and second AC voltage terminals. Thus, the third and fourth half-bridges act like inverters to generate a preferably single-phase AC voltage from the DC voltage at the two-pole AC voltage terminals.

[0021] In another form, to provide electrical energy to the intermediate terminal, - The AC voltage supplied to the input terminal unit is supplied to the positive and negative intermediate terminals as at least partially DC voltages via the PFC stage, the charging current is led to the intermediate terminals via the PFC stage through at least the first and second connecting conductors, or at least the second portion of the second connecting conductor, and preferably the entire charging current is returned via the neutral wire. - A bidirectional DC voltage converter connected to the intermediate terminals and a battery, preferably a traction battery, on the side, provides a DC voltage to the positive and negative intermediate terminals, for which the bidirectional DC voltage converter converts the battery voltage into a DC voltage to be provided to the positive and negative intermediate terminals.

[0022] It is advantageous to provide a topology that enables the provision of a DC voltage at the intermediate terminal, the energy for which can be provided either by an external energy source or by a battery, preferably an in-vehicle battery.

[0023] In one form, the charging device is adapted in the input terminal unit to provide an alternating voltage to the first input terminal and the neutral terminal, and in order to provide electrical energy to the first input terminal and the neutral terminal, the DC voltage provided to the positive intermediate terminal and the negative intermediate terminal is at least partially provided as an alternating voltage to the first input terminal and the neutral terminal, and the current is conducted between the positive intermediate terminal and the first input terminal through the first choke coil, and the current is conducted between the negative intermediate terminal and the neutral terminal through the second choke coil.

[0024] It is advantageous that a topology is provided that enables the provision of an alternating voltage at the first input terminal and the neutral terminal, and the energy therefor is provided by a battery, preferably a battery in a vehicle.

[0025] Furthermore, the present invention relates to a power train of a vehicle equipped with a charging device as described above, especially including a traction battery, an inverter, and / or an electric machine. It is advantageous that a power train of an electric vehicle equipped with a charging device having a simplified circuit topology is provided.

[0026] Furthermore, the present invention relates to a vehicle equipped with a power train as described above. It is advantageous that a vehicle equipped with a charging device having a simplified circuit topology is provided.

[0027] Furthermore, the present invention relates to a method of operating a charging device as introduced above, which has steps of controlling the fourth and sixth switching elements and the high-side and low-side switches of the third and fourth half-bridges in order to provide electrical energy to the two-pole alternating voltage terminal.

[0028] Control of the switches of the third and fourth half-bridges and the closing of the fourth and sixth switching elements converts the DC voltage applied to the intermediate terminals into an AC voltage, which is then applied to the two AC voltage terminals. It is advantageous to provide a method that enables the provision of an adjustable AC voltage at the two AC voltage terminals.

[0029] Furthermore, the present invention relates to a computer program that includes instructions causing a computer to perform the aforementioned method when the computer executes the program. Furthermore, the present invention relates to a computer-readable memory medium that includes instructions causing a computer to perform the aforementioned method during execution by a computer.

[0030] It is self-evident that the features, characteristics, and advantages of charging equipment are applicable to or relevant to methods or powertrains and vehicles, and vice versa. Further features and advantages of embodiments of the present invention will become apparent from the following description relating to the accompanying drawings.

[0031] The present invention will be explained in more detail below with reference to several figures. [Brief explanation of the drawing]

[0032] [Figure 1] This is a schematic diagram of one known embodiment of a circuit topology for charging devices, based on current technology. [Figure 2] This is a schematic diagram of a first embodiment of a circuit topology for a charging device. [Figure 3] This is a schematic diagram illustrating the current or energy flow in a first operating mode of a circuit topology for a charging device. [Figure 4] This is a schematic diagram illustrating an exemplary current or energy flow in a second operating mode of a circuit topology for a charging device. [Figure 5] This is a schematic diagram illustrating the current or energy flow in a third operating mode of a circuit topology for a charging device. [Figure 6] This is a schematic diagram of a vehicle equipped with a powertrain that includes charging equipment. [Figure 7] This is a flowchart that provides a general overview of how the charging device works. [Modes for carrying out the invention]

[0033] Figure 1 shows a charging device 500, preferably for a vehicle. The charging device 500 includes an input terminal unit 100 for connecting single-phase to three-phase AC voltages at the input side, and a PFC stage 200 for providing a DC voltage to an intermediate terminal 300. The PFC stage 200 of the charging device 500 includes a first half-bridge 210, a second half-bridge 220, and a third half-bridge 230. The first, second, and third half-bridges 210, 220, and 230 each include a series circuit with high-side switches 211, 213, and 215 and low-side switches 212, 214, and 216. The center taps between the high-side and low-side switches of the half-bridges can be coupled, respectively, to the first, second, and third input terminals L1, L2, and L3 of the input terminal unit 100 via the first, second, and third connecting wires 110, 120, and 130, respectively, through the first, second, and third choke coils 202, 204, and 206. Therefore, the center tap of the first half-bridge 210 can be coupled to the first input terminal L1 via the first choke coil 202 and the first connecting wire 110. Therefore, the center tap of the second half-bridge 220 can be coupled to the second input terminal L2 via the second choke coil 204 and the second connecting wire 120. Therefore, the center tap of the third half-bridge 230 can be coupled to the third input terminal L3 via the third choke coil 206 and the third connecting wire 130. These half-bridges 210, 220, and 230 are connected in parallel. Their ends are coupled to a two-pole intermediate terminal 300. The high-side switch is coupled to the positive intermediate terminal 310, and the low-side switch is coupled to the negative intermediate terminal 320. Preferably, a DC voltage converter 450 is connected to the intermediate terminal 300. Preferably, the DC voltage at the intermediate terminal 300 applied to the input side of the DC voltage converter 450 is converted to a charging voltage for charging a battery 470, preferably a traction battery or high-voltage battery, which can be connected to the output side of the DC voltage converter 450.Preferably, a further DC voltage converter 460, preferably a step-down converter, is connected in parallel with battery 470 to convert the charging voltage to a low voltage for charging a low-voltage battery 462 and supplying it to the vehicle's onboard network for use with the vehicle's control equipment. The low-voltage battery 462, and preferably further low-voltage consumer equipment (not shown), are also connected to the vehicle's onboard network. Preferably, the further DC voltage converter 460 is a bidirectional DC voltage converter. That is, preferably, the further DC voltage converter 460 can be used to precharge a high-voltage intermediate circuit before battery 470 is connected to the charging equipment 500. The high-voltage intermediate circuit is adjacent to the DC voltage converter 450 on the output side. Preferably, an inverter 480 is connected to the onboard network to convert the low voltage to AC voltage for supplying household consumer equipment. The household consumer equipment is preferably supplied with AC voltage, which varies depending on the region and is about 120 volts or 230-240 volts. For this reason, AC voltage consuming equipment can be connected to the first terminal electrode 482 and the second terminal electrode 484.

[0034] Starting with the charging device 500 based on Figure 1, the charging device 500 according to the present invention based on Figure 2 includes two AC voltage terminals 400. To provide an AC voltage to the AC voltage terminal 400, the charging device 500 includes a fourth half-bridge 240, which is connected in parallel to the first, second, and third half-bridges 210, 220, and 230, and is equipped with a high-side switch 217 and a low-side switch 218, the middle tap between the high-side and low-side switches of the fourth half-bridge 240 being switchably coupled to the second AC voltage terminal 420 of the two-pole AC voltage terminal 400 via a sixth switching element S6, and a fourth switching element S4 is provided, which is adapted to establish coupling between the third half-bridge 230 and the first AC voltage terminal 410 via a third choke coil 206, or coupling between the third half-bridge 230 and the third connecting conductor 130 to the third input terminal L3 via the third choke coil 206. Preferably, two AC voltage terminals are adapted for supplying power to household appliances during operation. Preferably, AC voltage is supplied to household appliances, and this AC voltage varies depending on the region, but is approximately 120 volts or 230-240 volts.

[0035] Preferably, the input terminal unit 100 further includes a neutral wire terminal N1. A series circuit of a first diode D1 and a second diode D2 is connected in parallel to the half-bridges 210, 220, 230, and 240. The first and second diodes D1 and D2 are connected in reverse to prevent current flow from the positive intermediate terminal 310 to the negative intermediate terminal 320 and to allow current flow from the negative intermediate terminal 320 to the positive intermediate terminal 310. The center taps between the first and second diodes D1 and D2 are coupled to the neutral wire terminal N1 via the neutral wire 140. A series circuit of a first capacitor C1 and a second capacitor C2 is connected in parallel to these half-bridges 210, 220, 230, and 240. A fifth switching element S5 is provided, which is adapted to connect a second choke coil 204, coupled on one side to the second half-bridge 220, to the neutral wire 140, or to the second connecting conductor 120 and the second input terminal L2.

[0036] Preferably, the second connecting conductor 120 is divided into a first portion 120_1 and a second portion 120_2. For this purpose, a second switching element S2 is provided, which is positioned between the first portion 120_1 and the second portion 120_2 of the second connecting conductor. The second switching element S2 is adapted to guide the charging current from the second input terminal L2 to the second choke coil 204 via the first and second portions 120_1 and 120_2 of the second connecting conductor, or to guide the charging current from the first connecting conductor 110 to the second choke coil 204 via the second portion 120_2 of the second connecting conductor.

[0037] Preferably, a first switching element S1 is provided, which is adapted to enable or interrupt the current flow between the first input terminal L1 and the first connecting conductor 110.

[0038] Preferably, a third switching element S3 is provided, which is adapted to enable or interrupt the charging current between the third input terminal L3 and the third connecting conductor 130.

[0039] It is preferable that precharge resistors, preferably switchable resistors, thermistors, or NTC resistors, are connected in parallel to the first switching element S1 and the third switching element S3 in order to attenuate and limit the inrush current when an AC voltage is connected to the input terminal unit 100 before the first and third switching elements S1 and S3 are closed.

[0040] It is preferable that the seventh switching element S7 is positioned between the center taps of the first and second diodes D1 and D2 and the center taps of the first and second capacitors C1 and C2.

[0041] Preferably, current sensors (A) are placed in the first, second, and third choke coils 202, 204, and 206, respectively, to determine the current passing through each choke coil 202, 204, and 206. Preferably, the high-side switch, low-side switch, and switching elements are controlled to implement a desired operating mode depending on the determined current. Preferably, voltage sensors (V) are placed between the first, second, and third connecting conductors 110, 120, and 130 and the neutral wire 140, respectively, to determine the voltage. Preferably, voltage sensors (V) are also placed between the positive and negative intermediate terminals 310 and 320, and between the intermediate taps between the first and second capacitors C1 and C2 and the negative intermediate terminal 320, respectively. Preferably, the high-side switch, low-side switch, and switching elements are controlled to implement a desired operating mode depending on the determined voltage. Preferably, the negative intermediate terminal 320 is coupled to ground GND AC. Preferably, GND AC is the internal potential.

[0042] It is preferable that the switching element is provided as a semiconductor switch component (IGBT or MOSFET based on Si, SiC, or GaN), or as a contactor or relay.

[0043] Figure 3 shows a schematic diagram of an exemplary current flow or energy flow in a first operating mode of the circuit topology for the charging device 500. To provide electrical energy to the two AC voltage terminals 400, it is preferable that the DC voltages supplied to the positive and negative intermediate terminals 310 and 320 are at least partially supplied as AC voltages to the first AC voltage terminal 410 and the second AC voltage terminal 420. For this purpose, it is preferable that a fourth switching element S4 establishes coupling from the center tap of the third half-bridge 230 to the first AC voltage terminal 410 via the third choke coil 206, and a sixth switching element S6 establishes coupling from the center tap of the fourth half-bridge 240 to the second AC voltage terminal 420. Therefore, as shown in Figure 3, current paths are created from the positive intermediate terminal 310 through the third half-bridge 230 and the third choke coil 206, through the fourth switching element S4, preferably through a filter 404, preferably an EMC filter, to the first AC voltage terminal 410, and from the second AC voltage terminal 420, through a closed switching element S6, through the fourth half-bridge 240, to the negative intermediate terminal 320. Preferably, a fourth capacitor C4 between the first AC voltage terminal 410 and the second AC voltage terminal 420 is auxiliary to filter the supplied AC voltage. In summary, it is made possible to supply electrical energy to the two-pole AC voltage terminal 400. This two-pole AC voltage terminal 400 is preferably supplied inside or outside the vehicle, preferably by an outlet, to a connected, preferably household, consumer appliance 402. The electrical energy at the intermediate terminal 300 can be supplied from an energy source connected to the input terminal in single-phase to three-phase configuration, and / or preferably from a battery 470 connected via a DC voltage converter 450. For this purpose, the DC voltage converter 450 is configured as a bidirectional DC voltage converter. This DC voltage converter 450 converts the DC voltage of the battery 470 into a desired DC voltage at the intermediate terminal 300.

[0044] Figure 4 shows a schematic diagram of an exemplary current flow or energy flow in a second operating mode of the circuit topology for the charging device. To provide electrical energy to the intermediate terminal 300, it is preferable that the AC voltage supplied to the input terminal unit 100 is supplied to the positive intermediate terminal 310 and the negative intermediate terminal 320 as at least partially DC voltage via the PFC stage 200. It is preferable that the charging current is led to the intermediate terminal 300 via the PFC stage 200 through at least the first connecting conductor 110 and the second connecting conductor 120, or at least the second portion 120_2 of the second connecting conductor. It is preferable that the entire charging current is filtered through the first and second capacitors C1 and C2 and returned to the neutral terminal N1 via the diode D2 and the neutral wire 140. It is preferable that the three-phase AC current of the three-phase AC voltage source connected to the input terminal unit is led to the intermediate terminal via the first, second, and third choke coils 202, 204, and 206 by all three connecting conductors 110, 120, and 130 when the first and third switching elements S1 and S3 are closed. It is preferable that the three-phase AC current of the three-phase AC voltage source connected to the input terminal unit is led to the intermediate terminal via the first and second choke coils 202 and 204 by the first and second connecting conductors 110 and 120 when the first switching element S1 is closed and the third switching element S3 is open. Based on this resulting asymmetric load of the charging device 500, it is preferable that the coupling between the center tap of the series circuit of the first and second capacitors C1 and C2 and the center tap of the series circuit of the first and second diodes D1 and D2 is closed using the switching element S7. The closed switching element S7 allows an alternative path for the charging current, or the resulting current, to return along the neutral wire 140. Preferably, the single-phase AC current of the single-phase AC voltage source connected to the input terminal unit is led to the intermediate terminals via the first, second, and third choke coils 202, 204, 206 by all three connecting conductors 110, 120, 130 in the case of closed first and third switching elements S1, S3, by a bridge 150, galvanic connection between the first, second, and third input terminals L1, L2, L3.Preferably, the single-phase AC current of a single-phase AC voltage source connected to the input terminal unit is guided to the intermediate terminals via first and second choke coils 202 and 204 by a bridge 150, galvanic connection between the first, second, and third input terminals L1, L2, L3, via first and second connecting conductors 110 and 120 in the case of a closed first switching element S1 and an open third switching element S3. The bridge 150 is preferably used in charging equipment 500 used in regions around the world where infrastructure and public current networks provide only single-phase AC voltage sources as external AC voltage sources. Preferably, the single-phase AC current of a single-phase AC voltage source connected to the first input terminal L1 of the input terminal unit 100 is guided to the intermediate terminals via first and second choke coils 202 and 204 by a second switching element S2, via first connecting conductors 110 and a second portion 120_2 of the second connecting conductor in the case of a closed first switching element S1. In summary, various possibilities are introduced for supplying electrical energy to the intermediate terminal 300. These various possibilities correspond to the current paths during charging operations in which energy from an external energy source connected to the input terminal 100 is transmitted to the intermediate terminal 300. It is preferable that the second operating mode be performed independently. In the case of the possibility of the second operating mode with the switching element S3 open, it is preferable that the first operating mode, the supply of electrical energy at the two-pole AC voltage terminal 400, is performed simultaneously.

[0045] Figure 5 shows a schematic diagram of an exemplary current or energy flow in a third operating mode of the circuit topology for a charging device. It is preferable that the DC voltages supplied to the positive intermediate terminal 310 and the negative intermediate terminal 320 are supplied to the first input terminal L1 and the neutral terminal N1 as AC voltages, at least partially, to provide electrical energy to the first input terminal L1 and the neutral terminal N1. It is preferable that current is guided between the positive intermediate terminal 310 and the first input terminal L1 via the first half-bridge 210 and the first choke coil 202. For this purpose, it is preferable that the first switching element S1 is closed. Current between the negative intermediate terminal 320 and the neutral terminal N1 is guided via the second half-bridge 220 and the second choke coil 204, and a fifth switching element S5 enables current flow from the second choke coil 204 to the neutral terminal N1 via the neutral wire 140. Preferably, a third capacitor C3 between the first connecting conductor 110 and the neutral conductor 140 auxiliaryly filters the provided AC voltage. Preferably, the provided AC voltage is specified for supplying household appliances. Household appliances are preferably supplied with AC voltage, which varies depending on the region and is about 120 volts or 230-240 volts. In summary, electrical energy at the first input terminal L1 and the neutral conductor terminal N1 enables the provision of an adjustable AC voltage. This electrical energy is preferably supplied outside the vehicle, preferably by an outlet, to supply further connected, preferably household, appliances. For this purpose, the electrical energy at the intermediate terminal 300 is preferably supplied from the side of a battery 470 connected via a DC voltage converter 450. For this purpose, the DC voltage converter 450 is configured as a bidirectional DC voltage converter. Preferably, the third operating mode is performed alone or simultaneously with the first operating mode.

[0046] Figure 6 shows a schematic diagram of a vehicle 700 equipped with a powertrain 600 with charging equipment 500. The vehicle 700 is represented here only exemplary with four wheels, and the present invention can be similarly used in any vehicle with any number of wheels on land, water, and in the air. The exemplary powertrain 600 includes at least one charging equipment 500. The powertrain preferably further includes a battery 470, an inverter 472, and / or an electromechanical unit 474.

[0047] Figure 7 shows a schematic flowchart of the operation method 800 of the charging device 500. Method 800 starts in step 805. In step 810, the high-side and low-side switches of the fourth and sixth switching elements S4, S6 and the third and fourth half-bridges 210, 220, 230, 240 are controlled to supply electrical energy to the two-pole AC voltage terminals 400. Method ends in step 815.

Claims

1. A charging device for vehicles, The charging device (500) includes an input terminal unit (100) for connecting a single-phase or three-phase AC voltage on the input side, a PFC stage (200) for providing a DC voltage to an intermediate terminal (300), and a two-pole AC voltage terminal (400) for providing an AC voltage. The PFC stage (200) includes a first (210), a second (220), and a third (230) half-bridge. The first, second, and third half-bridges (210, 220, 230) each include a series circuit with high-side switches (211, 213, 215) and low-side switches (212, 214, 216), and the intermediate taps between the high-side switches and low-side switches of the half-bridges can each be coupled to the first, second, and third input terminals (L1, L2, L3) of the input terminal unit (100) via first, second, and third connecting wires (110, 120, 130) via first, second, and third choke coils (202, 204, 206), respectively. The half-bridges (210, 220, 230) are connected in parallel, and their ends are coupled to the two-pole intermediate terminal (300), with the high-side switch coupled to the positive intermediate terminal (310) and the low-side switch coupled to the negative intermediate terminal (320). The charging device includes a fourth half-bridge (240), the fourth half-bridge (240) being connected in parallel to the first, second, and third half-bridges (210, 220, 230), and comprising a high-side switch (217) and a low-side switch (218), wherein the middle tap between the high-side switch and the low-side switch of the fourth half-bridge (240) is switchably coupled to the second AC voltage terminal (420) of the two-pole AC voltage terminal (400) via a sixth switching element (S6), A fourth switching element (S4) is provided, which is adapted to establish coupling between the third half-bridge (230) via the third choke coil (206) and the first AC voltage terminal (410) of the two AC voltage terminals (400), or coupling between the third half-bridge (230) via the third choke coil (206) and the third connecting conductor (130) to the third input terminal (L3). charging equipment.

2. The input terminal unit (100) further includes a neutral wire terminal (N1), The first, second, and third half-bridges (210, 220, 230) are connected in parallel to a series circuit of a first (D1) and a second (D2) diode, and the first and second diodes (D1, D2) are connected such that a voltage is applied in the reverse direction, blocking current flow from the positive intermediate terminal (310) to the negative intermediate terminal (320) and allowing current flow from the negative intermediate terminal (320) to the positive intermediate terminal (310), and the intermediate tap between the first and second diodes (D1, D2) is coupled to the neutral terminal (N1) via the neutral wire (140). The first, second, and third half-bridges (210, 220, 230) are connected in parallel to a series circuit consisting of a first (C1) capacitor and a second (C2) capacitor. A fifth switching element (S5) is provided, and the fifth switching element (S5) is adapted to connect the second choke coil (204), which is coupled on one side to the second half-bridge (220), to the neutral wire (140) and the second connecting conductor (120) toward the second input terminal (L2). The charging device according to claim 1.

3. The second connecting conductor (120) is divided into a first portion (120_1) and a second portion (120_2), A second switching element (S2) is provided, which is positioned between the first portion (120_1) and the second portion (120_2) of the second connecting conductor, and is adapted to guide a charging current from the second input terminal (L2) to the second choke coil (204) via the first and second portions (120_1, 120_2) of the second connecting conductor, or to guide a charging current from the first connecting conductor (110) to the second choke coil (204) via the second portion (120_2) of the second connecting conductor. The charging device according to claim 2.

4. The charging device according to claim 1, further comprising a first switching element (S1) adapted for enabling or interrupting current flow between the first input terminal (L1) and the first connecting conductor (110).

5. The charging device according to claim 2, further comprising a third switching element (S3) adapted for enabling or interrupting the charging current between the third input terminal (L3) and the third connecting conductor (130).

6. The charging device according to claim 2, wherein a seventh switching element (S7) is disposed between the center tap between the first and second diodes (D1, D2) and the center tap between the first and second capacitors (C1, C2).

7. In order to provide electrical energy to the two AC voltage terminals (400), the DC voltage provided to the positive intermediate terminal (310) and the negative intermediate terminal (320) is at least partially provided to the first AC voltage terminal (410) and the second AC voltage terminal (420) as an AC voltage. The fourth switching element (S4) establishes a coupling from the center tap of the third half-bridge (230) to the first AC voltage terminal (410) via the third choke coil (206), and the sixth switching element (S6) establishes a coupling from the center tap of the fourth half-bridge (240) to the second AC voltage terminal (420). The charging device according to claim 1.

8. In order to provide electrical energy to the intermediate terminal (300), - The AC voltage supplied to the input terminal unit (100) is supplied to the positive intermediate terminal (310) and the negative intermediate terminal (320) at least partially as a DC voltage via the PFC stage (200), the charging current is led to the intermediate terminal (300) via the PFC stage (200) through at least the first connecting conductor (110) and the second connecting conductor (120), or at least the second portion (120_2) of the second connecting conductor, and the entire charging current is returned via the neutral wire (140), or - A DC voltage supplied from the side of the bidirectional DC voltage converter (450) connected to the intermediate terminal (300) and the battery (470) connected thereto is supplied to the positive intermediate terminal (310) and the negative intermediate terminal (320), for which the bidirectional DC voltage converter (450) converts the voltage of the battery (470) into a DC voltage to be supplied to the positive intermediate terminal (310) and the negative intermediate terminal (320). The charging device according to claim 3.

9. The charging device (500) is adapted to provide AC voltage to the first input terminal (L1) and the neutral wire terminal (N1) in the input terminal unit (100). In order to provide electrical energy to the first input terminal (L1) and the neutral terminal (N1), the DC voltage provided to the positive intermediate terminal (310) and the negative intermediate terminal (320) is provided to the first input terminal (L1) and the neutral terminal (420) at least partially as an AC voltage. Current is guided between the positive intermediate terminal (310) and the first input terminal (L1) via the first choke coil (202), and current is guided between the negative intermediate terminal (320) and the neutral wire terminal (N1) via the second choke coil (204). The charging device according to claim 2.

10. A powertrain (600) of a vehicle (700) equipped with the charging device (500) described in claim 1.

11. A vehicle (700) equipped with the powertrain (600) according to claim 10.

12. A method for operating a charging device (800) according to claim 1, The step (810) of controlling the high-side and low-side switches of the fourth and sixth switching elements (S4) and (S6) and the third and fourth half-bridges (230, 240) in order to provide electrical energy to the two AC voltage terminals (400), Method of operation (800).

13. A computer program that includes an instruction causing the computer to execute the method (800) described in claim 12 when the computer executes the program.

14. A computer-readable memory medium that includes an instruction causing the computer to execute the method (800) described in claim 12 when executed by the computer.

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