Schaeffler Technologies Ag & Co .kg

Huan Fu

Vincent Leonhardt

Jürgen Tipper

Eduard Enderle

A method is provided for testing switch signals of an inverter of an electric machine of a drive system of a motor vehicle. The electric machine is controlled via a pulse-width modulation generated by a control unit using a target duty cycle and a triangular-waveform voltage sequence. An actual duty cycle of a current pulse-width modulation is continuously ascertained from the switch signals and compared with the target duty cycle of the control unit.

Method for testing switch signals of an inverter of an electric machine controlled via a pulse-width modulation

A circuit for discharging an energy store of a drive system includes a power electronics unit in an on-board electrical system and a single-phase DC/DC converter connected upstream of the drive system. The converter includes a first capacitor, a coil connected downstream of the first capacitor, a first switch, a second switch connected downstream of the coil, and a second capacitor connected downstream of the second switch. The first switch is for a first current circuit including the first capacitor and the coil, and the second switch is for a second current circuit including the first capacitor, the second capacitor, and the coil. During a discharge process, the first switch and the second switch are designed to be switched in an alternating manner and differently relative to each other such that either the first current circuit or the second current circuit is closed to actively discharge the energy store.

Circuit for discharging an energy store of a drive system

A multiphase voltage transformer for an electrical supply network for supplying an electrical machine with electrical energy from an electrical energy storage system. This electrical supply network includes the multiphase voltage transformer, an output current converter connected downstream of this transformer and an intermediate circuit connected between the transformer and the output current converter. The transformer includes a circuit arrangement having parallel-connected voltage transformer units at the input end, each of these units having an inductance and two semiconductor switch units and a control unit for actuating the semiconductor switch units. The control unit is configured so as to actuate the semiconductor switch units in an intermediate circuit discharging operation such that it powers down the intermediate circuit voltage of the intermediate circuit in less than a second into the low voltage range. A corresponding electrical supply network, an energy supply system having network and a method are provided.

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Rastatt, Germany

Huan Fu