Patent ID: 7417394

Claim:
An arrangement in a power output stage for testing the power output stage, said power output stage having at least three half-bridges, each of said half-bridges comprising a series circuit including an upper semiconductor switch and a lower semiconductor switch connected at a junction point forming an output, said power output stage further comprising means for applying an operating voltage to each of said at least three half-bridges and windings of an at least three phase motor connected to respective outputs of said at least three half-bridges, said arrangement comprising a control device connected to each of said upper and lower semiconductor switches and running a program, said control device arranged and dimensioned for switching one or a plurality of said upper and lower semiconductor switches to an on state according to a switching state defined by the program, said control device further connected to said outputs and arranged and dimensioned for testing whether the voltages at the respective outputs lie within predetermined tolerance ranges for the switching state, said arrangement further comprising further switches for interrupting feeds to said windings.