Abstract: The boost converter suffers the low convergence speed and chattering phenomenon in the scheme with sliding mode variable structure control. A double power reaching law-based sliding mode hysteresis control strategy is proposed. To achieve the current tracking control, a sliding surface is defined based on the estimated tracking current error. By considering the unmodeled dynamics and the unknown disturbances, the adaptive state observer is established. The adaptation laws are designed based on the Lyapunov function and the adaptive duty ratio is calculated. A double power reaching law is proposed, which can set the parameter selection standard according to the different features of system approaching process and purposefully adjust the dynamic response quality. A sliding mode hysteresis controller is designed, which aims at reducing chattering phenomenon caused by the sign function. Simulation results show that the dynamic response performance and robustness of current control are improved effectively.

Key words: double power reaching law, sliding-mode control, adaptive state observer, hysteresis controller, boost converter