Modeling and Designing of Buck Converters Based on Voltage Mode Control

Based on the time-variant and the nonlinear characteristics of DC-DC Buck Converter, the chapter analyzes the converter’s operation mode and its working principle. The small signal mathematical model of Buck DC-DC converter operated in the continuous conduction is established by the use of the state-space averaging method, and the closed-loop control system of voltage mode control with the model is built as well. The waveforms of simulations of typical Buck converter circuit model and state-space averaging mathematic model are compared with the MATLAB software and simulation results fitting the theoretical analysis shows the validity of the proposed modeling method. The simulation result of the closed control system of voltage mode control shows that the system is stable. The method to determine the parameters of DC-DC converter is also presented in the chapter.