| 摘要 |
A method in conjunction with output chokes of an inverter, a phase output of the inverter being configured to be composed of two or more parallel branches, each of which comprises an upper and a lower power semiconductor component at the output, the upper one of which being coupled to a positive voltage of a direct voltage intermediate circuit and the lower to a negative voltage, the components being in series, an output of each branch being composed of a point between the components. The output choke comprises branch-specific single-phase chokes, first ends of coils of which chokes are coupled to the outputs of the branches and second ends together to form the phase output of the inverter, the method comprising the steps of predetermining a voltage limit and a time limit to be used for indicating a fault situation, determining control information on the power semiconductor components of the branches, determining a collector voltage of the power semiconductor components of the branches in those power semiconductor components that have been conveyed to a conductive state, detecting a fault situation in the power semiconductor component the collector voltage of a power semiconductor component coupled in series therewith exceeds the predetermined voltage limit for a period of time longer than the predetermined time limit. |
