Bayerische Motoren Werke Aktiengesellschaft

Michael Reiter

Hubert Herrmann

Christoph Sudan

A control method and a switching device are provided for a separately excited synchronous machine as a drive in a hybrid or electric vehicle. The switching device converts and/or distributes electrical energy within the vehicle, in particular the hybrid or electric vehicle, wherein an asymmetric full bridge is provided, in the bridge branch of which a rotor of an SSM is arranged. Switches are provided in the asymmetric full bridge in order to provide a pulse width modulation corresponding to a desired motor rotational speed and power of the SSM. The device is characterized in that it has a short-circuit branch extending in parallel with the bridge branch of the asymmetric full bridge, by which short-circuit branch the rotor of the SSM is able to be short-circuited.

Control method and switching device

An actuation circuit for an inverter includes a direct voltage converter to convert direct current at a first voltage into direct current at an intermediate circuit voltage, and a driver unit that generates inverter control signals, based on direct current at the intermediate circuit voltage, to switch elements of the inverter. The actuation circuit also includes a discharge unit supplied with direct current at the intermediate circuit voltage, where the discharge unit switches, in response to a discharge control signal, a discharge resistor in parallel to an output of the direct voltage converter, and a control unit that is supplied with direct current at the intermediate circuit voltage. The control unit is configured to generate, for the discharging of the back-up capacitor, a discharge control signal that causes the discharge unit to switch the discharge resistor in parallel to the output of the direct voltage converter.

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Augsburg, Germany

Michael Reiter