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1. A control circuit for a power converter applicable to a system in which a power storage unit and a rotary electric machine including multiphase windings are provided, and the power converter includes multiphase switch modules, each of the switch modules including a pair of an upper-arm switch and a lower-arm switch, the upper-arm switch and the lower-arm switch of each phase switch module being electrically connected to a corresponding one of the multiphase windings, the control circuit comprising: a switching instruction generator configured to generate switching instructions for the respective upper- and lower-arm switches for drive control of the rotary electric machine, each switching instruction instructing turn-on or turn-off of the corresponding switch; a switch driver configured to perform a drive operation that turns on or off the respective upper- and lower-arm switches based on the respective switching instructions; a failure determiner configured to determine whether there is a failure in the system; a fail-safe controller configured to perform, in response to determination that there is a failure in the system, a short-circuit control routine that: turns on predetermined turn-on arm switches; and turns off predetermined turn-off arm switches, the turn-on arm switches being one of (i) the upper-arm switches and (ii) the lower-arm switches, the turn-off arm switches being the other of (i) the upper-arm switches and (ii) the lower-arm switches; and an on determiner configured to: detect a drive state of each turn-on arm switch upon determination that the turn-on is instructed for the corresponding turn-on arm switch by the switching instruction generator; and determine, based on the drive state of each turn-on arm switch, whether the turn-on arm switches are switchable to be on in preparation for the short-circuit control routine performed by a short-circuit controller.
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