ELECTRIC VEHICLE POWER SUPPLY SYSTEM, CONTROL METHOD THEREOF, AND ELECTRIC VEHICLE

A charger (200) converting electric power from an external power supply (260) into charging power for a power storage device (110) converts AC power on a power line (ACL 1, ACL 2) into charging power for an auxiliary battery (180). A CHR (240) connects or disconnects a path between the charger (200) and the power storage device (110). A DC/DC converter (230) converts DC power on a power line (PL2) connected to a smoothing capacitor (C2) into charging power for the auxiliary battery (180) and outputs the power onto a power line (PL3). An ECU (300) discharges the smoothing capacitor (C1, C2) even if the voltage (Vo) on the power line (PL2) is lower than a determination voltage by causing the DC/DC converter (230) to operate to charge the auxiliary battery (180) in a discharging mode where the CHR (240) is set OFF.