Abstract
Switch-mode rectifier (SMR) has been gradually employed as a front-end stage of various power electronic equipments. And the buck-boost SMR possesses many distinguished features and specific applications. Thus this thesis is mainly concerned with the development of a buck-boost SMR and its dynamic control. First, the fundamentals of power factor correction issues and control approaches are reviewed, and some commonly referred standards are surveyed. Then the overview of practical issues for SMRs is made, including the classifications and comparative features of possible SMR circuits and control schemes. Particularly, the circuit configurations, features and applications of various types of buck-boost SMRs are explored. As generally recognized, the proper rating determination for power converter circuit components is very important to yield the circuit with cost-effective and robust operation. In this thesis, the component rating derivation and assessment of an ideal SMR are first made. Then the derivation is modified to accurately estimate the component ratings of an actual buck-boost SMR considering the switching frequency ripples. According to the derived results, the constituted components of the studied SMR are designed. Some simulated results using ElectroMagnetic Transients Program (EMTP) and measured results are provided to confirm the correctness of the derived formulas and to demonstrate the performance of the established SMR. As to the dynamic control, in both of the current and voltage control schemes, the proportional-plus-integral (PI) feedback controller is first properly designed according to its control requirements. Then it is augmented with a simple robust control scheme to increase the robustness against the system uncertainties, the parameter and operating condition changes and the disturbances. In performing the robust controller design, its key parameters are determined taking into account the compromise between the control performance, the effects of contaminated noises and the nonlinear behaviors. Validity of the proposed control approach and the performance of the developed SMR are confirmed by some simulation and experimental results.