Control method and switching device

A device provided as a switching device in a vehicle having a high-voltage intermediate circuit with high-voltage components for converting and/or distributing electrical energy within the vehicle, comprising:

• an asymmetric full bridge, in a bridge branch of which a rotor of an SSM is arranged;
• switches 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;
• and
• a short-circuit branch running parallel to the bridge branch of the asymmetric full bridge, by which the rotor of the SSM is capable being short-circuited, the short-circuit branch including a diode and a transistor arranged in series, wherein the transistor is always switched on except when the rotor is rapidly de-energized,
• wherein the switches are switched synchronously.