Patent ID: 9573475
Date: 2017-02-21
CPC Classifications: B60K,B60L,F02N,Y02T,Y10S

Claim:
1. A drive unit comprising: a power converter, which is connectable to a working machine, comprising an intermediate circuit, which is coupleable firstly to a first inverter and secondly to a second inverter, wherein the first inverter is designed to be connectable to a motor on an AC voltage side of the first inverter and is connected to the intermediate circuit on a DC voltage side of the first inverter, and wherein the second inverter is connected to the intermediate circuit on a DC voltage side of the second inverter and is connectable to the working machine on an AC voltage side of the second inverter, and wherein the second inverter is designed to drive the working machine in such a way that the working machine is operable either as a motor or as a generator; a link to at least one energy storage; a switching unit connected to the power converter, wherein the switching unit is operable in a first operating mode or second operating mode, wherein in the first operating mode the switching unit is designed to couple the power converter to the at least one energy storage in order to enable an energy flow from the at least one energy storage via the switching unit to the intermediate circuit of the power converter and wherein in the second operating mode the switching unit is designed to disconnect the power converter from the at least one energy storage; wherein the drive unit comprises an energy storage charging unit, which is connectable to the power converter to provide energy to the energy storage, wherein the charging of the energy storage by the energy charging unit is carried out, if the switching unit is in its second operating mode, and wherein the switching unit is designed to couple the power converter to a supply network terminal in order to enable an energy flow from the intermediate circuit of the power converter via the switching unit toward the supply network terminal.