A control circuit for an electric power converter includes an abnormality determiner, a voltage determiner and an abnormality-handling controller. The abnormality determiner determines whether an abnormality has occurred in at least one of the electric power converter and a multi-phase rotating electric machine. The voltage determiner determines whether a line-to-line voltage between phase windings of the rotating electric machine is higher than a voltage of a DC power source. The abnormality-handling controller performs, when it is determined by the abnormality determiner that an abnormality has occurred and it is determined by the voltage determiner that the line-to-line voltage is higher than the voltage of the DC power source, an all-phase short circuit control of turning on all of switches of one of an upper-arm switch group and a lower-arm switch group and turning off all of switches of the other of the upper-arm switch group and the lower-arm switch group.