Oil pressure supply system of automatic transmission

An oil pressure supply system of an automatic transmission, the system comprising:

• a mechanical oil pump configured to pump oil that is stored in an oil pan utilizing high oil pressure and to discharge oil pressure to a line pressure path, wherein the mechanical oil pump is driven by an engine;
• a line regulator valve configured to stably control the oil pressure that is supplied through the line pressure path and to supply the oil pressure to a first path;
• a torque converter control valve configured to control the oil pressure that is supplied through the first path and to supply the oil pressure to a second path and a third path;
• a torque converter lockup clutch control valve configured to:
• supply the oil pressure supplied through the second path to lock-up clutch operating chamber and lock-up clutch non-operating chamber of a torque converter through a fourth path and a fifth path;
• and
• supply the oil pressure supplied through the third path to a cooling/lubricating unit through a sixth path;
• an electric oil pump configured to pump the oil stored in the oil pan by the high oil pressure and to discharge the oil pressure to a seventh path when necessary;
• a switch valve configured to open and close the oil pressure supplied to an eighth path, wherein the switch valve is disposed on the seventh path;
• and
• a flow control valve configured to control a portion of the oil pressure supplied to the eighth path and to supply the portion of the oil pressure to the cooling/lubricating unit through a ninth path,
• wherein the seventh path is connected with the line pressure path through a first check valve,
• wherein the eighth path is connected with the second path through a second check valve, and
• wherein the sixth path is merged with the second path and the sixth path is connected with the ninth path through a third check valve.