A Double-Integral Sliding Mode-Based Hybrid Control for a Single-Input-Multiple-Output Buck Converter

A hybrid single-input-multiple-output (SIMO) buck converter is recently proposed for high-voltage-step-down and transformerless dc-dc applications. By far, no closed-loop control scheme has been designed for the SIMO buck converter in achieving output current and output voltage control. This article bridges the research gap by proposing a double-integral sliding mode-based hybrid control (DISMHC) to accurately regulate the output current and output voltage of the SIMO buck converter. The DISMHC comprises a double-integral sliding mode control for the first module of the converter and multiple linear control for the remaining modules. Both simulation and experimental results validate that the DISMHC can be implemented in inexpensive digital controllers to regulate the SIMO buck converter with negligible steady-state errors and superior dynamic performance than a proportional-integral-based hybrid control. This, thereby, protects the loads and constituting components of the SIMO buck converter from undesirable overshoots/undershoots and settling time.