Abstract: The invention relates to a method (200) for operating a switched-mode power supply unit (120), comprising capturing (210) at least one operating parameter of the switched-mode power supply unit (120), determining (220), using the at least one operating parameter, a variable of the switched-mode power supply unit (120), said variable being dependent on an output power, comparing (230) the variable dependent on the output power with a power threshold value, and carrying out a measure (240), which more particularly comprises lowering the output power of the switched-mode power supply unit (120), if the determined output power exceeds the power threshold. Further proposed is a voltage supply device (100) designed to carry out such a method (200).

Abstract: An inverter for an electric machine as well as a method for operating an inverter for an electric machine. In this context, the inverter has at least one output stage unit for producing a connection between the electric machine and a power supply network, a control unit for controlling the at least one output stage unit, a supply unit independent of the power supply network for the power supply of the output stage unit(s), at least one emergency operation control assigned to the output stage unit(s) for controlling the output stage unit(s) in the fault case, as well as at least one emergency operation supply assigned to the output stage unit(s) for generating a power supply for the output stage unit(s) from the power supply network in the fault case.

Abstract: An inverter for an electric machine, and a method for operating the inverter, has at least one output stage unit for producing a connection between the electric machine and a power supply network, a control unit for controlling the output stage unit, a supply unit independent of the power supply network for power supply of the output stage unit, at least one emergency operation control assigned to the output stage unit for controlling the output stage unit such that switching elements are switched into a short circuit operation, at least one emergency operation supply assigned to the output stage unit for generating a power supply from the power supply network, and a coordination control, which activates or deactivates the emergency operation control as a function of a status signal of the independent supply unit and a standby signal of the control unit.

Abstract: An inverter for an electric machine, and a method for operating the inverter, has at least one output stage unit for producing a connection between the electric machine and a power supply network, a control unit for controlling the output stage unit, a supply unit independent of the power supply network for power supply of the output stage unit, at least one emergency operation control assigned to the output stage unit for controlling the output stage unit such that switching elements are switched into a short circuit operation, at least one emergency operation supply assigned to the output stage unit for generating a power supply from the power supply network, and a coordination control, which activates or deactivates the emergency operation control as a function of a status signal of the independent supply unit and a standby signal of the control unit.

Abstract: An inverter for an electric machine as well as a method for operating an inverter for an electric machine. In this context, the inverter has at least one output stage unit for producing a connection between the electric machine and a power supply network, a control unit for controlling the at least one output stage unit, a supply unit independent of the power supply network for the power supply of the output stage unit(s), at least one emergency operation control assigned to the output stage unit(s) for controlling the output stage unit(s) in the fault case, as well as at least one emergency operation supply assigned to the output stage unit(s) for generating a power supply for the output stage unit(s) from the power supply network in the fault case.