A study of hybrid control algorithms for buck-boost converter based on fixed switching frequency

摘要: Buck-boost converter is a typical hybrid dynamic system including both discrete and continuous subsystems which may be modeled by simple formal model named automaton. Based on the automaton model, this paper proposes new control algorithm of buck-boost converter, can simultaneously work in CCM DCM operations. Using algorithm, design simplified to selection transition guards between different operation statuses. Unlike other algorithms, switching frequency at steady state does not vary with disturbances load input voltage entire process. The simulation results show that has advantages fast response high stable precision, further extended power electronic converters.