Patent ID: 7064460

Claim:
A method for balancing a three-point DC voltage intermediate circuit, in which a converter circuit, which is connected to a first capacitor (C 1 ) and to a second capacitor (C 2 ) in the three-point DC voltage intermediate circuit, influences the electrical power flow in the three-point DC voltage intermediate circuit, and in which an intermediate circuit voltage mean value ({overscore (U DC )}) is formed from a first intermediate circuit voltage (U DC1 ), which is present across the first capacitor (C 1 ), and from a second intermediate circuit voltage (U DC2 ), which is present across the second capacitor (C 2 ), wherein the intermediate circuit voltage mean value ({overscore (U DC )}) is monitored for a threshold value (U DCS ) which can be predetermined, in that, if the threshold value (U DCS ) is exceeded, the first capacitor (C 1 ) is connected by means of the converter circuit to an energy store, and the energy store is then connected by means of the converter circuit to the second capacitor (C 2 ), and in that if the threshold value (U DCS ) is undershot, the second capacitor (C 2 ) is connected to the energy store by means of the converter circuit, and the energy store is then connected to the first capacitor (C 1 ) by means of the converter circuit.