Output voltage ripple suppression scheme of single-stage full-bridge PFC converter basic on auxiliary winding

Because of the special circuit structure of the single-stage full-bridge power factor corrector, there is large output voltage ripple which is double industrial frequency. The output characteristic of the corrector has been influenced. As a conventional method, increasing the output capacitor could reduce the ripple, while the dynamic response is reduced. A novel output-voltage-ripple suppression scheme is proposed in the auxiliary winding single stage full-bridge PFC converter in this paper, which made output voltage ripple lower. Compared with the conventional method, the proposed scheme can solve the problem without influence the dynamic response. The input current of clamp capacitor and the output current of the auxiliary winding have been designed; the control circuit and the constrained conditions of the key parameters have been designed. As the theoretic and experimental proved, output voltage ripple is suppressed by this scheme and the key parameters is validity.