Research On Digital Controlled S~2PFC Converter Based On DSP

The subject does research on DSP based Single-Phase Single-Stage Corrected Converter based. To meet the requirements of larger power capacity, more strict limits of harmonic distortion and lower cost, based on detailed and specific analysis of interrelated technology of PFC, a single-stage isolate full-bridge PFC (S2PFC) converter is introduced and is successfully developed. Compared with the traditional two-stage PFC solution, the adopted topology is a preferable candidate for application with characteristic of higher power level, high power factor and isolation. Moreover, higher power density and higher characteristic of cost effective are achieved.In this dissertation, present situation and significance of the topologies control algorithm, and the sample algorithms of the digital control PFC are summarized. The dissertation gives analysis and comparison of the recent developments and principles of various control strategies in digital control PFC. Based on average current mode, the dissertation introduce the design and implementation of a fully digital controlled single-phase full-bridge power factor correction with fast response. The control-loop is realized using digital control and the S2PFC can tend to unity power factor, low current harmonics and high transfer efficiency.The double close-loop framework is applied in the PFC controlling circuit and the PI algorithm is adopted as system's control algorithm. The PFC digital control theory is introduced. The system's small-signal model is established based on the research of control algorithm. On the basis of the establishment of the small-signal model, it specific gives the design of PI regulator for the double-loop system, and simulation results show the correctness and the feasibility of the design.Based on the theory analysis, the DSP control programs is developed. The software is consisted of a main program and a interrupt subprogram, which contains some modules to realize independent functions, such as initialization module, PI algorithm module, sampling algorithm module and interrupt module, etc. Connected by the main program, these modules realize an integrated system. It is easier to manage and upgrade when the program frame like this is adopted.Finally, according to the simulation results and the experiment results, all design theories are proved to be realizable. Meanwhile, summarize is made for this dissertation and the orientation for this item was proposed at the end of this dissertation.