Patent ID: 7881076
Filing Date: 2011-02-01
Classification: H02M,Y02B

Abstract:
1. A buck-boost PFC converter comprising: an inductor having a first winding and a second winding, and the first and second winding having a first terminal and a second terminal, respectively; a first transistor coupled to a positive-power rail and the first terminal of the first winding of the inductor, wherein a sine wave signal is provided to the positive-power rail; a second transistor coupled to the second terminal of the first winding of the inductor and a negative-power rail; a first diode connected from the second terminal of the first winding of the inductor to an output of the buck-boost PFC converter; a second diode connected from the first terminal of the first winding of the inductor to the negative-power rail; and a control circuit generating a first signal and a second signal coupled to control the first transistor and the second transistor respectively; wherein the first signal is utilized to turn on the first transistor for conducting the positive-power rail to the inductor, and the second signal is utilized to turn on the second transistor for conducting the inductor to the negative-power rail.