System of increasing temperature of battery for vehicle

A system of increasing a temperature of a battery for a vehicle, the system comprising:

• an on-board charger including a capacitor and a bidirectional direct current (DC) converter having first input/output terminals connected to the capacitor and second input/output terminals connected to a battery and configured to perform a bidirectional power transfer between the first input/output terminals and the second input/output terminals;
• and
• a controller configured to:
• drive, when temperature rising of the battery is required, the bidirectional DC converter such that a direction of a power transfer is alternated, and
• supply an alternating current (AC) current having a predetermined frequency to the battery,
• wherein the bidirectional DC converter includes:
• a transformer;
• a first switching circuit connected between the first input/output terminals and a primary winding of the transformer and including a plurality of switching elements;
• and
• a second switching circuit connected between the second input/output terminals and a secondary winding of the transformer and including a plurality of switching elements.