CPC H02P 27/08 (2013.01) [B60L 3/003 (2013.01); B60L 3/0046 (2013.01); B60L 3/04 (2013.01)] | 17 Claims |
1. A multiphase voltage transformer for an electrical supply network for supplying an electrical machine with electrical energy from an electrical energy storage system, the electrical supply network comprises the multiphase voltage transformer, an output current converter connected downstream of the multiphase voltage transformer and an intermediate circuit connected between the multiphase voltage transformer and the output current converter, the multiphase voltage transformer comprising:
a circuit arrangement having a plurality of parallel-connected voltage transformer units at an input end, each of said transformer units having an inductance and two semiconductor switches, and a controller for actuating the semiconductor switches,
the controller being configured to actuate the semiconductor switches units in an intermediate circuit discharging operation such that the intermediate circuit voltage of the intermediate circuit is powered down in less than two seconds into a voltage range lower than 60 V DC.
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