PWM-Based Double Integral Sliding Mode Control for Current Control Loop of DC-DC Boost Converter Pokkrong Vongkoon a,1 , Jirawut Benjanarasut b , and Pisit Liutanakul b a Division of Instrumentation and Automation Engineering Technology, Faculty of Engineering and Technology, King Mongkut’s University of Technology North Bangkok, Thailand b Department of Electrical and Computer Engineering, Faculty of Engineering, King Mongkut’s University of Technology North Bangkok, Thailand Abstract. The use of dc-dc boost converters is common for increasing output volt- age and supplying power. These converters, being time-varying nonlinear circuits, encounter uncertainties in load and variations in input voltage and current over a wide range. Nonlinear sliding mode control (SMC) has emerged as a promising strategy, offering advantages in terms of stability and robustness against parameter and load fluctuations. To address switching frequency variations in conventional hysteresis-based SMC, the indirect SMC or pulse-width modulation (PWM)-based SMC has been adopted. However, the adoption of PWM-based SMC raised con- cerns regarding steady-state error in power converters. Despite incorporating the in- tegral of the state variable into the sliding surface of PWM-based SMC, the steady- state error still exists. Focusing on the current control loop of a dc-dc boost con- verter with the goal of reducing steady-state error, this study proposes double inte- gral sliding mode control (DISMC), which employs a sliding surface that includes the double integral term of the current error. Simulation and experimental results demonstrate that the proposed approach effectively mitigates the steady-state error of the inductor current. Keywords. sliding mode control (SMC), double integral SMC (DISMC), pulse width modulation (PWM), boost converter, current control 1. Introduction Power electronic converters have become integral to everyday life and various industrial applications, including LED lighting systems, battery energy storage systems, and pho- tovoltaic systems [1–3]. In cases where there is a low-level input voltage source, like a battery, a dc-dc boost converter is typically utilized to increase the output voltage and power the load. For a dc bus system with a battery, it is crucial to pay attention to the performance of the current control loop because charging and discharging current signif- 1 Corresponding Author: Division of Instrumentation and Automation Engineering Technology, Faculty of Engineering and Technology, King Mongkut’s University of Technology North Bangkok, Rayong province, Thailand; E-mail: pokkrong.v@eat.kmutnb.ac.th Power, Energy and Electrical Engineering M. Deng (Ed.) © 2024 The Authors. This article is published online with Open Access by IOS Press and distributed under the terms of the Creative Commons Attribution Non-Commercial License 4.0 (CC BY-NC 4.0). doi:10.3233/ATDE240361 614