System and method for operating a system

A system, comprising:

• a rectifier adapted to be supplied from an electrical AC-voltage supply network;
• an inverter having an AC-voltage side connection adapted to feed an electric motor;
• and
• a DC/DC converter connected to an energy accumulator;
• wherein a DC-voltage side connection of the inverter is connected to a DC-voltage side connection of the rectifier, a first DC-voltage side connection of the DC/DC converter connected to the DC-voltage side connection of the rectifier, the DC-voltage side connection of the inverter and the first DC-voltage side connection of the DC/DC converter being switched in parallel;
• wherein signal electronics of the DC/DC converter includes a controller unit adapted to control power absorbed from the AC-voltage supply network, via the rectifier, to a setpoint value in that a controller determines a setpoint value for a charging current as a controlled-variable signal based on a characteristic of a difference between the power absorbed by the rectifier from the AC-voltage supply network and a setpoint value, an acquired charging current of the energy accumulator is controlled to the setpoint value for charging current in that control signals having a corresponding pulse pattern are generated for semiconductor switches of the DC/DC converter;
• and
• wherein a precontrol path and/or a path for a feedforward injection of a disturbance variable is provided at the controller, so that power delivered and/or absorbed by the electric motor via the inverter is effective as a precontrol signal and/or a disturbance variable.

A method for operating a system that includes a rectifier adapted to be supplied from an electrical AC-voltage supply network, an inverter adapted to feed an electric motor, and a DC/DC converter connected to an energy accumulator, a DC-voltage side connection of the inverter being connected to a DC-voltage side connection of the rectifier, the electric motor being supplied from an AC-voltage side connection of the inverter, a first DC-voltage side connection of the DC/DC converter connected to the DC-voltage side connection of the rectifier, the DC-voltage side connection of the inverter and the first DC-voltage side connection of the DC/DC converter being switched in parallel, signal electronics of the DC/DC converter including a controller unit, comprising:

• controlling, to a setpoint value, power absorbed from the AC-voltage supply network, via the rectifier, in that a controller determines a setpoint value for a charging current as a controlled-variable signal based on a characteristic of a difference between the power absorbed by the rectifier from the AC-voltage supply network and a setpoint value;
• and
• controlling an acquired charging current of the energy accumulator to the setpoint value for the charging current in that control signals having a corresponding pulse pattern are generated for semiconductor switches of the DC/DC converter;
• wherein a precontrol path and/or a path for a feedforward injection of a disturbance variable is provided at the controller so that power that is output and/or absorbed by the electric motor via the inverter is effective as a precontrol signal and/or a disturbance variable.

A system, comprising:

• a rectifier adapted to be supplied from an electrical AC-voltage supply network;
• an inverter including an AC-voltage side connection adapted to feed an electric motor;
• and
• a DC/DC converter connected to an energy accumulator;
• wherein a DC-voltage side connection of the inverter is connected to a DC-voltage side connection of the rectifier, a first DC-voltage side connection of the DC/DC converter connected to a DC-voltage side connection of the rectifier, the DC-voltage side connection of the inverter and the first DC-voltage side connection of the DC/DC converter being switched in parallel;
• wherein:
• (a) the DC/DC converter has a first housing in which a current acquisition device is arranged, the current acquisition device adapted to acquire (i) a current and/or network phase currents flowing into the rectifier at the AC-voltage side connection of the rectifier or (ii) a current emerging from the rectifier at the DC-voltage side connection of the rectifier, the current acquisition device adapted to forward an acquired value to signal electronics arranged in the housing of the DC/DC converter, the signal electronics adapted to generate control signals for semiconductor switches of the DC/DC converter;
• and
• (b) signal electronics of the DC/DC converter includes a controller unit adapted to control power absorbed from the AC-voltage supply network, via the rectifier, to a setpoint value in that a controller determines a setpoint value for a charging current as a controlled-variable signal based on a characteristic of a difference between the power absorbed by the rectifier from the AC-voltage supply network and a setpoint value, an acquired charging current of the energy accumulator is controlled to the setpoint value for charging current in that control signals having a corresponding pulse pattern are generated for semiconductor switches of the DC/DC converter, and a precontrol path and/or a path for a feedforward injection of a disturbance variable is provided at the controller, so that power delivered and/or absorbed by the electric motor via the inverter is effective as a precontrol signal and/or a disturbance variable.