Abstract: Various embodiments include a charging circuit for a vehicle-side electrical energy store comprising: an alternating current terminal; at least two smoothing capacitors; a configuration device; and a rectifier via which the alternating current terminal is connected to the configuration device. The configuration device connects the rectifier to the at least two smoothing capacitors and is configured to connect the smoothing capacitors to one another in a first parallel arrangement and a second series arrangement. The alternating current terminal comprises a neutral conductor terminal connected via a diode circuit to the configuration device.

Abstract: A configurable DC-DC converter circuit has first and second DC voltage connections. The first DC voltage connection connected to a plurality of galvanically isolating DC-DC converters via a configuration circuit that has first and second switches, between which a changeover switch connects the first and second switches to one another via a diode device and connects the first and second switches to one another via a resistor. The DC-DC converters connected to the first and second switches. In the first changeover switch position, the first and the second switch are closed in a first configuration position and connect the DC-DC converters in parallel with one another. If the changeover switch is in the first switching position, the first and second switches, in a second configuration position in which the first and the second switches are open, the DC-DC converters are connected in series with one another via the diode device.

Abstract: A vehicle electrical system is equipped with an energy store, a DC charging terminal and an AC charging terminal. The vehicle electrical system also has a power low-pass filter. The power low-pass filter connects a first section of the vehicle electrical system to a second section of the vehicle electrical system. The DC charging terminal is provided in the second section. The AC charging terminal is provided in the first section.

Abstract: A vehicle on-board electrical system is equipped with a DC voltage charging connection, a non-configurable accumulator, a galvanically isolating DC-DC voltage converter, and an electrical drive. The accumulator is connected to a first side of the DC-DC voltage converter via a switchable connection circuit to which a DC voltage charging connection is connected. The accumulator is connected to the electrical drive and a second side of the DC-DC voltage converter via a drive switch. The connection circuit has a direct connection switch that connects the accumulator to the first side of the DC-DC voltage converter in a switchable manner. The DC voltage charging connection is connected to the direct connection switch via a charging connection switch of the connection circuit.

Abstract: A motor vehicle on-board power system with a power converter, windings, an electric machine and a delta switch group is described. The electric machine is connected to the power converter, wherein a DC external connection is provided. The delta switch group connects the windings in a delta configuration. At least one switch of the delta switch group also connects at least one alternating current connection of the power converter to the DC external connection. A configuration controller actuates the delta switch group and has, on the one hand, the function of actuating the delta switch group in the closed state or open state within a driving state, according to a configuration specification. When energy is transmitted via the DC external connection, at least one switch of the delta switch group is actuated by the configuration controller according to a closed switching state. In addition, an associated method is described.

Abstract: A vehicle on-board electrical system having an AC voltage charging connection, a rechargeable traction battery, which is designed as a high-voltage rechargeable battery, and a power factor correction filter. The power factor correction filter connects the AC voltage charging connection directly to the rechargeable traction battery. The operating voltage range of the rechargeable traction battery is within the output voltage range of the power factor correction filter.

Abstract: An alternating current (AC) charging device for a motor vehicle may include: a neutral conductor; a phase conductor; a rectifier; a smoothing capacitor electrically connected to the rectifier; a mains connection; a precharge circuit arranged between the mains connection and the smoothing capacitor, the precharge circuit precharging the smoothing capacitor; and a second phase conductor electrically connected to the phase conductor by a cross-connection line. The neutral conductor and the phase conductor are connected to the rectifier. The precharge circuit is disposed in the neutral conductor.

Abstract: An alternating voltage charging device for a vehicle is equipped with a rectifier, a battery terminal, and at least one first DC link capacitor, which is provided between the rectifier and the battery terminal. The charging device includes a switch device, which connects at least one second DC link capacitor to the at least one first DC link capacitor. The switch device interconnects the DC link capacitors in parallel in a first switching state and in series in a second switching state. There is also described a method to be carried out by the charging device.

Abstract: An AC charging device for a motor vehicle has a neutral conductor, at least one phase conductor, and at least one rectifier. The neutral conductor and the at least one phase conductor are connected to the rectifier, to which at least one smoothing capacitor is also connected. The AC charging device has a precharge circuit arranged between a mains connection and the at least one smoothing capacitor. The precharge circuit is designed to precharge the at least one smoothing capacitor. The precharge circuit has at least one transistor.

Abstract: An AC charging device for a motor vehicle has a neutral conductor, at least one phase conductor, and at least one rectifier. The neutral conductor and the phase conductor are connected to the rectifier and the rectifier is furthermore electrically connected to at least one smoothing capacitor. The AC charging device includes a precharge circuit arranged between a mains connection of the AC charging device and the smoothing capacitor. The precharge circuit is designed to precharge the smoothing capacitor. The phase conductor, in a connection section, is connected to at least one further phase conductor of the AC charging device by way of a cross-connection line, which has a cross-connection switch for disconnecting the phase conductor and the further phase conductor. The precharge circuit is arranged between a mains connection of a first phase conductor of the phase conductors and the connection section.

Abstract: Various embodiments of the teachings herein include a vehicle-side charging apparatus comprising: an AC voltage connection; a rectifier connected to the AC voltage connection; a first DC/DC converter and a second DC/DC converter; and a DC voltage connection. Each DC/DC converter includes a intermediate circuit capacitor and a switch unit. The rectifier is connected to the DC voltage connection via the DC/DC converters. There is a switch connecting the DC/DC converters in a switchable manner. In a first switching state the respective intermediate circuit capacitors and the respective switch units of the DC/DC converters are connected in parallel with one another and in a second switching state in series with one another. There is a third DC/DC converter connecting the rectifier to the DC voltage connection.

Abstract: Various embodiments include a charging circuit for a vehicle-side electrical energy store comprising: an alternating current terminal; at least two smoothing capacitors; a configuration device; and a rectifier via which the alternating current terminal is connected to the configuration device. The configuration device connects the rectifier to the at least two smoothing capacitors and is configured to connect the smoothing capacitors to one another in a first parallel arrangement and a second series arrangement. The alternating current terminal comprises a neutral conductor terminal connected via a diode circuit to the configuration device.

Abstract: A vehicle electrical system is equipped with an energy store, a DC charging terminal and an AC charging terminal. The vehicle electrical system also has a power low-pass filter. The power low-pass filter connects a first section of the vehicle electrical system to a second section of the vehicle electrical system. The DC charging terminal is provided in the second section. The AC charging terminal is provided in the first section.

Abstract: A storage-battery charging device for a motor vehicle is configured to be arranged in the motor vehicle. The storage-battery charging device includes a first stage with a power factor correction filter, and a second stage with an inverter. The first stage is electrically connected to the second stage through an intermediate node, the intermediate node being directly electrically connected to a feed-in connection point for direct voltage. The feed-in connection point is designed for direct electrical coupling to a high-voltage vehicle electrical system of the motor vehicle.

Abstract: An on-board vehicle electrical system is provided with a rechargeable battery, an AC voltage connection and a DC voltage connection. The DC voltage connection is connected directly to the rechargeable battery via a connection point. The AC voltage connection is connected to the rechargeable battery via a rectifier and a first switch via the connection point. The rectifier is connected to the rechargeable battery via a DC-isolating DC/DC converter and a second switch. The second switch is connected to the rechargeable battery via the connection point. There is at least one consumer on-board electrical system branch, which includes a Cy capacitance and which is connected to the rechargeable battery via the second switch.

Abstract: Various embodiments of the teachings herein include a charging circuit for a vehicle-side electrical energy store comprising: an alternating current terminal; at least two smoothing capacitors; a configuration device; and a rectifier connecting the alternating current terminal to the configuration device. The configuration device connects the rectifier to the smoothing capacitors, and the configuration device is programmed to connect the smoothing capacitors to one another in a first parallel connection and a second series connection. The alternating current terminal comprises a neutral conductor terminal connected to the configuration device via a diode circuit. The configuration device comprises a first switch connecting the smoothing capacitors to one another in parallel when closed. The configuration device comprises a diode connecting the smoothing capacitors to one another in series when closed.

Abstract: A method and a vehicle electrical system having an inverter, an electrical energy store, an electrical machine and an AC transmission terminal. The inverter has first and second sides and is configured to transmit power between these sides. Two output terminals of the inverter are connected or connectable to the energy store on the first side of the inverter. At least two phase current terminals of the inverter are connected or connectable to the electrical machine on the second side of the inverter. At least one of the charging inputs of the vehicle electrical system is connectable to a respective inner motor phase of the electrical machine by a switching device controlled by a controller. The vehicle electrical system initially charges the electrical energy store with a first voltage, and then charges the electrical energy store with a second voltage, which second voltage is higher than the first voltage.

Abstract: A vehicle-side charging circuit includes an AC-voltage interface, a rectifier connected thereto and at least one first and one second DC-to-DC converter. The DC-to-DC converters are electrically isolating, and each have at least one intermediate circuit capacitor and at least one switch unit. The charging circuit also includes an on-board electrical system connection. The rectifier is connected to the on-board electrical system connection by way of the DC-to-DC converters. The charging circuit has a switch device which connects the DC-to-DC converters so as to be switchable between one another. In a first switching state, the switching device connects the two intermediate circuit capacitors and the switching units of the DC-to-DC converters in parallel and, in a second switching state, connects the intermediate circuit capacitors and the switch units in series.

Abstract: A vehicle electrical system having an electrical energy store, a direct voltage converter and a direct current transmission connection is described. The direct current transmission connection is connected to the energy store via the direct voltage converter. The vehicle electrical system also has a bypass switch which connects the electrical energy store in a switchable fashion to the direct voltage transmission connection. In addition, a method, a charging system, a charging station and a further vehicle electrical system are described.

Abstract: An alternating voltage charging device for a vehicle is equipped with a rectifier, a battery terminal, and at least one first DC link capacitor, which is provided between the rectifier and the battery terminal. The charging device includes a switch device, which connects at least one second DC link capacitor to the at least one first DC link capacitor. The switch device interconnects the DC link capacitors in parallel in a first switching state and in series in a second switching state. There is also described a method to be carried out by the charging device.