Sliding Mode Control of Two-Switch Buck Boost Non-Isolated On-Board Battery Charger

This paper presents the application of sliding mode control for a two-switch buck-boost (TSBB) non isolated on-board battery charger operating over a wide range of output voltages. A two-loop control scheme with PI in the outer loop and reduced order SMC in the inner loop is used to achieve the control objectives of tight output voltage regulation, high power factor and robustness of the control scheme. The complexity in the design and implementation of SMC was reduced by using Hankel model reduction method. Simulation was carried out on PSIM and MATLAB software to obtain comparative analysis of PI-SMC and PI-PI control Scheme. The PI-SMC showed good dynamic response and robust performance over PI-PI control scheme.