Patent ID: 8912738
Filing Date: 2014-12-16
Classification: B60L,H02J,H02P,Y02T

Abstract:
1. A drive system, comprising: an electromotor; an inverter; and an energy store; wherein the electromotor is suppliable from the inverter and the inverter is suppliable from the energy store; wherein the electromotor is arranged as three-phase AC motor in a star connection; wherein a star point of the electromotor is suppliable with current from a rectifier, which is suppliable from a secondary winding; and wherein the secondary winding suppliable from a primary winding, which is inductively coupled to the secondary winding; wherein if a first critical value of a voltage at the star point is exceeded, a charge current is discharged directly from the rectifier to the energy store with the aid of a diode, the first critical value corresponding to a charging voltage for the energy store; wherein if the first critical value of the voltage at the star point is undershot, the charge current is routed from the rectifier to the energy store via at least one stator winding and the inverter, the inverter and stator windings being operable as a boost chopper; and wherein if a second critical value which is greater than the first critical value is exceeded, a switch is closed, via which current is shunted from the star point to a lower potential, to protect the energy store from overcharging.