Study on the dynamical characteristic for voltage-feedback BUCK converter in CCM

Voltage-feedback BUCK converter, namely VCBUCK, which is the dominant component of SMPS system, have rich dynamical characteristic. For revealing internal relation between stability and system circuit parameters, VCBUCK in CCM was studied in details. According to practical closed-loop control logic, the general simulation model of difference or indifference in balance was set up by using the exact state equations in CCM. And the general discrete mathematical model was deduced by stroboscopic maps. Through varying parameters, nonlinearity characteristic was simulated and analyzed by numerical method. Through the experiments the result shows VCBUCK is sensitive to input voltage, filter capacitor, inductive storage and error amplifying coefficients, while it is not sensitive to error integral coefficients and load. The research results could serve guidance for circuit parameters selection in VCBUCK converter application.