Abstract: Disclosed herein is a complex circuit for charging and low-voltage conversion for an electric vehicle. The complex circuit is provided with a power factor correction converter including a first inductor, a transformer, a first switching unit connected to primary-side terminals of the transformer, a second switching unit connected to secondary-side terminals of the transformer, and a first capacitor, in which the complex circuit is operated in a charging mode for generating a high voltage power source and a low-voltage conversion mode for generating a low voltage power source in accordance with operations of the first switching unit and the second switching in the power factor correction converter.