Patent ID: 8610468

Claim:
A power interface circuit of a contact integrated circuit (IC) card reader, comprising: a power control unit configured to invert, amplify and output a power control signal supplied from the outside; a switching diode unit configured to output a control signal for controlling on and off operations of a ground terminal transistor in a complementary transistor unit in response to the output power control signal output from the power control unit; the complementary transistor unit in which complementary transistors transfer a power supply terminal voltage to a power output unit or mute a card power supply terminal of the power output unit to a ground voltage level while operating inversely to each other in response to the output power control signal directly input from the power control unit and the control signal input through the switching diode unit; and the power output unit configured to output a voltage input through the complementary transistor unit to a card power supply terminal of an IC card or maintain the card power supply terminal at the ground voltage level in response to operation of the complementary transistor unit.