Mitigating the Problem of Inrush Current in a Digital Sliding Mode Controlled Boost Converter Taking into Account Load and Inductor Nonlinearities and Propagation Delay in the Feedback Loop

摘要

Switching converters may exhibit unsuitable inrush current and an unacceptable transient response during startup. This phenomenon is mainly due to saturation of the duty cycle at the initial switching cycle and is more pronounced with nonlinear loads and reactive components and in the presence of unavoidable delays in the feedback. This paper proposes solutions to mitigate such problems in a digitally sliding-mode controlled dc-dc boost converter loaded with a constant power load and taking into account nonlinearities in the inductor. Numerical simulations from a detailed switched model validate the proposed approach and experimental measurements verify the mathematical analysis and the numerical simulation showing a good agreement.