Constant current fast charging of electric vehicles via dc grid using dual inverter drive

A device adapted to provide both drive and charging functionality from a DC power source, the device comprising:

• an electric motor in open stator winding configuration;
• a first inverter circuit including a first traction inverter and a first battery coupled to the electric motor and to a DC front-end circuit;
• a second inverter circuit including a second traction inverter and a second battery coupled to the electric motor and the DC front-end circuit, the DC front-end circuit coupled to the DC power source and the first inverter circuit and the second inverter circuit;
• a first connection between the negative terminal of the second battery and the DC front-end circuit;
• a second connection between the positive terminal of the first battery and the DC front-end circuit;
• the first battery and the second battery exchanging power with the DC power source;
• the DC front-end circuit including at least one switching device configured to control a charging input provided to at least one of the first and the second batteries, the at least one switching device controllable in conjunction with switches in at least one of the first inverter circuit and the second inverter circuit.