Non-linear current-mode control for boost power converters: a dynamic backstepping approach

摘要

A control scheme for boost power converters based on current-mode control is given. The proposed methodology relies on the design of two feedback loops. An outer loop for steady state error compensation using a proportional-integral action and a non-linear inner loop for current tracking. A dynamic backstepping controller with a well-defined region of attraction, ensuring asymptotic stability via a Lyapunov function, is achieved. The closed-loop system performance is evaluated through experimental results for a 130 W boost power converter with the controller implemented in a dSPACE platform, where precise regulation, tracking and robust behaviour with respect to large unknown load variations are proven successful.