Abstract: An electrical system for operating an AC electric motor in conjunction with a DC electrical energy storage and a DC electrical energy source is presented. It includes a multi-phase inverter or set of inverters, wherein multiple AC phases of the inverter or inverters are coupled to the motor, and separate DC connections of the inverter or inverters are coupled to the DC electrical energy source and the DC electrical energy storage.

Abstract: A method for operating a high-voltage on-board power system of a motor vehicle is proposed, in which the following steps are carried out: (a) generating a coupling signal for coupling a fuel cell of the vehicle to the on-board power system; (b) carrying out steps c) to f) depending on the coupling signal; (c) activating the fuel cell depending on the coupling signal; (d) determining a current operating voltage of the fuel cell; (e) adjusting an operating voltage of the high-voltage on-board power system decoupled from the fuel cell to the operating voltage of the fuel cell; and (f) coupling the fuel cell to the high-voltage on-board power system.

Abstract: An intermediate circuit adaptation device for a vehicle. The intermediate circuit adaptation device includes a DC intermediate circuit with at least two phases and a control unit. The control unit is configured to change the intermediate circuit voltage and/or the number of phases of the intermediate circuit on the basis of the current operating point.

Abstract: An electrical system for operating an AC electric motor in conjunction with a DC electrical energy storage and a DC electrical energy source is presented. It includes a multi-phase inverter or set of inverters, wherein multiple AC phases of the inverter or inverters are coupled to the motor, and separate DC connections of the inverter or inverters are coupled to the DC electrical energy source and the DC electrical energy storage.

Abstract: A method for operating a high-voltage on-board power system of a motor vehicle is proposed, in which the following steps are carried out: (a) generating a coupling signal for coupling a fuel cell of the vehicle to the on-board power system; (b) carrying out steps c) to f) depending on the coupling signal; (c) activating the fuel cell depending on the coupling signal; (d) determining a current operating voltage of the fuel cell; (e) adjusting an operating voltage of the high-voltage on-board power system decoupled from the fuel cell to the operating voltage of the fuel cell; and (f) coupling the fuel cell to the high-voltage on-board power system.

Abstract: An intermediate circuit adaptation device for a vehicle. The intermediate circuit adaptation device includes a DC intermediate circuit with at least two phases and a control unit. The control unit is configured to change the intermediate circuit voltage and/or the number of phases of the intermediate circuit on the basis of the current operating point.

Abstract: An electrical system for a vehicle which can be electrically driven includes a high-voltage DC system and a low-voltage DC system. A DC/DC converter is, or can be, electrically connected to the high-voltage DC system at one end and to the low-voltage DC system at the other end. An AC line passage is, or can be, electrically connected to a first DC/AC converter. The first DC/AC converter is, or can be, electrically connected to the high-voltage DC system at one end and to an AC drive device of the vehicle by way of the AC line passage at the other end. There is also included a DC energy source, in particular a fuel cell device for example. A second DC/AC converter is, or can be, electrically connected to the DC energy source at one end and to the AC line passage at the other end.

Abstract: An electrical system for a vehicle which can be electrically driven includes a high-voltage DC system and a low-voltage DC system. A DC/DC converter is, or can be, electrically connected to the high-voltage DC system at one end and to the low-voltage DC system at the other end. An AC line passage is, or can be, electrically connected to a first DC/AC converter. The first DC/AC converter is, or can be, electrically connected to the high-voltage DC system at one end and to an AC drive device of the vehicle by way of the AC line passage at the other end. There is also included a DC energy source, in particular a fuel cell device for example. A second DC/AC converter is, or can be, electrically connected to the DC energy source at one end and to the AC line passage at the other end.