A power switching circuit includes a transformer, a rectifying unit, a first switching unit, a second switching unit and a feedback unit. The transformer includes a central-tapped terminal. The transformer is configured to output a first power signal. The rectifying unit is coupled to the transformer. The rectifying unit receives the first power signal and outputs a second power signal to a load. The first switching unit is coupled to the central-tapped terminal of the transformer. The second switching unit is coupled to the rectifying unit and the first switching unit. The feedback unit is configured to receive the second power signal and control the first switching unit and the second switching unit.