Abstract: A method and apparatus for protecting a high-performance power converter. The high-performance power converter comprises a mains power converter, which converts an alternating voltage from a mains power supply into a direct voltage and supplies the direct voltage to an intermediate direct voltage circuit. The intermediate direct voltage circuit is equipped with an intermediate circuit capacitor, and includes a second power converter which converts the direct voltage from the intermediate direct voltage circuit into an alternating voltage, whereby each of the mains power converter and the second power converter is set up as a bridge circuit and each contains a number of IGBTs (Insulated Gate Bipolar Transistors) arranged in pairs in bridge arms.

Abstract: A power converter circuit arrangement having a plurality of parallel power converters or power converter arms is specified, in which an effective uniform distribution of current can be achieved in a simple manner. This is achieved by virtue of the fact that balancing inductors which are arranged between two adjacent power converters comprise at least one ring core, and that the load connections of two adjacent power converters or power converter arms are looped through the ring cores from different sides and are brought together to a common load current connection of all of the parallel power converters or power converter arms.