Controller Design for Low-Input Voltage Switching Converters having Non-minimum Phase Characteristics

This paper presents the design of feedback loop control for the switching converter having non-minimum phase characteristics. As an example, low-input voltage high frequency boost converter operating in continuous conduction mode having a right-half plane zero is considered as a plant. A frequency response based controller is usually not suggested for the non-minimum phase plants. In order to facilitate the control engineers and designers being well accustomed to the classical control techniques, feedback loop using the classical control theory is introduced to get better dynamic response. Additional phase lag of 90 degrees acquainted by RHP-zero perplexes the loop compensation. Issues of designing the controller are highlighted in a comprehensive way. Simulation results using the MATLAB/Simulink environment are presented to get insight into compensated system.