A method for controlling an electrified vehicle having a traction battery electrically coupled to an electric machine, a synchronous DC/DC voltage converter, and a plurality of switches configured to selectively connect external charging terminals to the voltage converter, the traction battery, and external load terminals, the method comprising, by a vehicle controller, based on nominal voltage of the traction battery relative to DC voltage detected at the external charging terminals and a predetermined DC voltage selectively delivered to the external load terminals:
- controlling the plurality of switches to selectively connect the external charging terminals, the voltage converter, and the external load terminals;
- and
- controlling whether the voltage converter operates to increase or decrease voltage based on which one or more of the voltage converter, the external charging terminals, the external load terminals, and the traction battery are connected by the plurality of switches.