Converter having a DC voltage intermediate circuit for supplying a rotating-field machine

摘要

In the case of the converter according to the invention, the DC voltage intermediate circuit (2) is connected to the mains (R, Y, B) via an uncontrolled rectifier (1). An invertor (7) is connected in parallel with the rectifier (1) for energy feedback, which invertor (7) is connected to the mains via an autotransformer (8). In order to reduce the outlay for the invertor (1) and in order to improve the efficiency, the connecting lead between the rectifier (1) and the DC voltage intermediate circuit (2) is to be interrupted, using a switch (6a, 6b), during energy feedback when the rotating-field machine is being operated as a generator. IMAGE