| 摘要 |
There is provided an electric power converter configured to reduce the possibility that a processor unit (11) will make an erroneous determination that an abnormality is caused in a power module (12). The processor unit (11) executes detection of an overheating predicted state that is a stage prior to overheating of the IGBTs (32a to 32f), a short circuit predicted state that is a stage prior to a short circuit in the arms (31u, 31v, 31w), and a voltage drop predicted state that is a stage prior to a drop in a control voltage (Vcb) to be supplied to a driver circuit (22). When none of these predicted states is detected, a determination that an abnormality is not caused in the power module (12) based on a latch signal (S_lat) is made by the processor unit (11). When an overheating predicted state is detected, the processor unit (11) lowers the duty ratio of a motor control signal (S_mc). When a short circuit predicted state is detected, the processor unit (11) prolongs the dead time in which the upper IGBT (32a to 32c) and the lower IGBT (32d to 32f) are both maintained in the off-state. |
