Abstract: A supplementary charging device for an AC wallbox includes a housing, a first port for coupling to a charging port of a vehicle, the first port including an AC port and a DC port, a second port for coupling to an AC output of the AC wallbox via an AC charging cable, an at least unidirectionally formed DC/AC converter, and a control device arranged in the housing, the control device to couple the second port to the AC port of the first port, to couple the AC port of the at least unidirectionally formed DC/AC converter to the second port and to couple the DC port of the at least unidirectionally formed DC/AC converter to the DC port of the first port in a first operating mode, such that power coupled-in via the DC port of the DC/AC converter is provided at the second port.

Abstract: A motor vehicle includes an electric traction energy storage, at least two DC voltage converters, and a contact device for electrically contacting a vehicle-external energy source. The at least two DC voltage converters are each connected in series at a first side. The contact device is connected to the first sides of the DC voltage converters. The traction energy storage is connected to second sides of the DC voltage converters.

Abstract: A charging system for an electrical home energy storage feeding a home alternating current supply network, which is connected across an AC-DC converter to the home alternating current supply network, comprises a coupling device for the direct charging of the home energy storage from at least one electrical motor vehicle energy accumulator of a motor vehicle, the motor vehicle having a bidirectional onboard charging device with at least one motor vehicle connection device, wherein the coupling device comprises: a coupling connection device designed for connection to the motor vehicle connection device, and a converter device for converting the electric power put out from the motor vehicle through the motor vehicle connection device into charging power for the home energy storage.

Abstract: A motor vehicle includes an electric traction energy storage, at least two DC voltage converters, and a contact device for electrically contacting a vehicle-external energy source. The at least two DC voltage converters are each connected in series at a first side. The contact device is connected to the first sides of the DC voltage converters. The traction energy storage is connected to second sides of the DC voltage converters.

Abstract: An energy supply device for providing electrical energy to a motor vehicle comprises an energy supply unit arranged in a housing. It is thereby provided that the energy supply unit is electrically connected on the one hand to an energy source and on the other hand to a transmission device designed to establish a safety extra-low voltage connection to the motor vehicle, and the energy supply unit can be controlled by means of a control unit to provide the energy for the motor vehicle, wherein the control unit is provided and designed to control a further energy supply unit said further energy supply unit can be arranged separately from the energy supply unit in the housing and can be electrically connected on the one hand to the energy source and on the other hand to the motor vehicle. A method for operating an energy supply device, a method for manufacturing energy supply devices and an energy supply arrangement are also provided.

Abstract: A charging device for a motor vehicle with a high-voltage battery, wherein the charging device includes a supply unit that is designed to supply a transmission voltage (UT), and a connecting apparatus that is designed to connect the supply unit to the motor vehicle to charge the high-voltage battery, wherein the transmission voltage is a contact-safe transmission voltage (UT). The motor vehicle includes a converter unit that converts a contact-safe transmission voltage (UT) to a high-voltage charging voltage (UHV) for charging the high-voltage battery. When a charging arrangement formed from the charging device and the motor vehicle is operated, the connecting apparatus is automatically connected to the connector device and the contact-safe transmission voltage (UT) is converted to the high-voltage charging voltage (UHV) in order to charge the high-voltage battery.

Abstract: A charging device for a motor vehicle with a high-voltage battery, wherein the charging device includes a supply unit that is designed to supply a transmission voltage (UT), and a connecting apparatus that is designed to connect the supply unit to the motor vehicle to charge the high-voltage battery, wherein the transmission voltage is a contact-safe transmission voltage (UT). The motor vehicle includes a converter unit that converts a contact-safe transmission voltage (UT) to a high-voltage charging voltage (UHV) for charging the high-voltage battery. When a charging arrangement formed from the charging device and the motor vehicle is operated, the connecting apparatus is automatically connected to the connector device and the contact-safe transmission voltage (UT) is converted to the high-voltage charging voltage (UHV) in order to charge the high-voltage battery.