AC-DC converter

An alternating current to direct current (AC-DC), comprising:

• a rectifying unit configured to rectify an AC voltage that is being input;
• a boost converter unit connected to the rectifying unit and provided with a single inductor, a first switch, and a second switch formed thereto;
• a smoothing unit configured to smooth the voltage passing through the boost converter unit;
• and
• a control unit configured to control an ON/OFF control signal of the first switch and the second switch and control an ON/OFF of the first switch and the second switch such that the boost converter unit is operated as a power factor correction circuit or as an inrush current limiting circuit,
• wherein the control unit comprises:
• a power factor control block to generate an ON/OFF control signal of the first switch and the second switch such that the boost converter unit performs a power factor controlling mode that operates as the power factor correction circuit;
• an inrush current control block to generate an ON/OFF control signal of the first switch and the second switch such that the boost converter unit performs an inrush current controlling mode that operates as the inrush current limiting circuit;
• and
• a multiplexer to select one of the control signal generated through the power factor control block and the control signal generated through the inrush current control block, and to transmit the selected signal to the first switch and the second switch.