Stability analysis and AC modeling of high-efficiency BUCK/BOOST converter

A linear model of voltage-controlled BUCK/BOOST converter in CCM mode is built by means of inductor-voltage averaging approximation and capacitor-current averaging approximation according to working conditions. It is shown that the closed-loop control-to-output characteristics coincide with the results derived by the state-space averaging method. Dynamic characteristic of the system is simulated by using MATLAB in order to design the compensation network. The simulated results exhibit good agreement with those by HSPICE and experiment results, indicating the validity of the model and compensation network.