System for charging battery for vehicle using motor driving system

A battery charging system for charging a battery connected to a motor having a plurality of windings respectively corresponding to a plurality of phases, the battery charging system comprising:

• a first inverter including a plurality of first switching elements and having a DC terminal connected to the battery and an AC terminal connected to a first terminal of the plurality of windings;
• a second inverter including a plurality of second switching elements and having a DC terminal selectively short-circuited/opened with the DC terminal of the first inverter and an AC terminal connected to a second terminal of the plurality of windings;
• a first charging power application switch including a first end connected to a high potential terminal of the DC terminal of the second inverter and a second end to which a high potential of a DC charging voltage applied;
• a second charging power application switch including a first end connected to a low potential terminal of the DC terminal of the second inverter and a second terminal to which a low potential of the DC charging voltage applied;
• a third charging power application switch including a first end connected to the DC terminal of the first inverter and a second end connected to the DC terminal of the second inverter;
• and
• a controller, in a charging mode for charging the battery, configured to control an open/short-circuit state of the first to third charging power application switches, the plurality of first switching elements, and the plurality of second switching elements based on a level of the DC charging voltage applied to the DC terminal of the second inverter and a level of a voltage of the battery.