Adaptive state-feedback control for bridgeless boost power factor correction

Abstract

This paper presents an adaptive state-feedback controller for a bridgeless boost power factor correction (PFC) converter. The controller features a compact structure with minimal tuning effort and low computational demand, making it suitable for real-time digital and industrial applications. The adaptation mechanism is derived from the Lyapunov stability theorem, ensuring global asymptotic stability and robustness against parameter uncertainties and unmodeled dis- turbances. The current control of PFC is designed using a simplified state-space model in which the inductor current is treated as the system state. This model-based approach enables accurate current tracking without steady-state error while maintaining fast dynamic response. The discrete-time controller was implemented on a low-cost STM32 microcontroller to verify its practicality. Experimental results demonstrate that the adaptive Lyapunov-based controller achieves nearly unity power factor and low total harmonic distortion, confirming its effectiveness and suitability for single-phase PFC applications.