Power transforming apparatus and air conditioner including the same

A power transforming apparatus for supplying power to a motor having a magnetic bearing, the apparatus comprising:

• an inverter;
• a converter configured to, in an initial operation, receive alternating-current (AC) power;
• and
• an auxiliary circuit that is configured to perform initial charging by rectifying the AC power to a second power and that is configured to supply the rectified second power to an inverter controller and a magnetic bearing controller,
• wherein the inverter controller is configured to output a driving signal to the inverter using the second power and control the inverter to supply a rectified direct-current (DC) voltage to the converter,
• wherein the converter is configured to, during a normal operation, (i) stop supplying the second power to the inverter controller and (ii) control the rectified DC voltage to be supplied to the inverter controller and the magnetic bearing controller, and
• wherein the converter is configured to, based on a power failure being detected by the converter, output a control signal such that the second power from the auxiliary circuit is supplied to the inverter controller and the magnetic bearing controller.