Small signal analysis and controller design of a half-bridge single-stage power converter

In this paper, a half-bridge single-stage power converter is used as a fundamental study object. The half-bridge single-stage power converter proposed in this thesis has inherent gift of high power factor correction (PFC) even when the PFC inductor operates in discontinuous conduction mode (DCM). It is revealed that if the proposed converter is operating in DCM, it not only inherently has high power factor but also avoids the bulk capacitor from high voltage stress at light loads. Having decided the operating mode of the converter, the statespace averaged model is used to drive the DC operating point and the small signal model. Then each component of the proposed converter is designed to satisfy the specifications. The output voltage is ensured by Simulink simulations. Finally, experimental results are used to verify the accuracy of small-signal model wherein the voltage feedback controller is designed to regulate output voltage. The experimental results show good confirm with the analysis and designs.