Dc fast-charging bidirectional converter utilizing delta motor and inverter

A method of operating an electrical system, the method comprising:

• providing an energy storage device defining a first positive terminal and a first negative terminal and having a first voltage therebetween, a traction motor having a plurality of machine windings in a delta configuration and defining a first winding node, a second winding node, and a third winding node, an inverter including a plurality of pairs of semiconductor switches, and an external power source defining a second positive terminal and a second negative terminal and having a second voltage therebetween;
• applying, by each pair of semiconductor switches of the plurality of pairs of semiconductor switches, an alternating current (AC) power to a corresponding one of the first winding node, the second winding node, and the third winding node, and using direct current (DC) power from the energy storage device;
• selectively conducting, by a mode control switch, current directly between the second positive terminal of the external power source and a given winding node of the first winding node, the second winding node, and the third winding node for operating the electrical system in a power converter mode for transferring power between the energy storage device and the external power source;
• and
• selectively blocking, by the mode control switch, current between the second positive terminal of the external power source and the given winding node for operating the traction motor in a torque producing mode.