| 摘要 |
For each phase (80, 180,280) of a controller (11 ), semiconductor switches comprise a high side switch (81, 181, 281 ) and a low side switch (82, 182, 282). A direct current voltage bus (64, 66) provides electrical energy to the semiconductor switches (81, 82.181.182.281,282). A measuring circuit (32,34) is adapted to measure the collector-emitter voltage or drain-source voltage for each semiconductor switch of the controller (11). A data processor (10) determines that a short circuit in a particular semiconductor switch is present if the measured collector-emitter voltage or measured source-drain voltage for the particular semiconductor switch is lower than a minimum threshold and if an observed current associated with the particular semiconductor switch has an opposite polarity from a normal operational polarity. |
