Analysis and Design of PI-Lead Compensator for DC-DC Boost Converter

Abstract

This paper presents an algorithm for compensator design to regulate the output voltage of an ideal DC-DC boost converter. The DC-DC boost converter is one of the power interfacing systems that find popularity in numerous applications like green energy harvesting, telecommunication system, electric vehicles, switched-mode power supplies (SMPS), etc. These demanding applications of DC-DC converters in the engineering domain need a steady and well-regulated dc voltage source by mitigating the perturbation either on the input or load side. The transfer function of the boost converter inherently has a zero on the right–half-side of the s-plane, thereby making it a non-minimum phase system (NMPS). This NMPS behavior puts a limit on the bandwidth while designing the compensator. This paper makes use of the proportional-integral lead (PI-Lead) compensator to regulate the output voltage of an ideal DC-DC boost converter. The main objective of this analysis is to attain the required phase margin (PM) at a specified gain cross-over frequency (GCF) by proper tuning of the compensator parameter. Moreover, comparative stability analysis of PI-Lead compensator has been conducted with type-II compensator. The simulation results show that the PI-Lead compensator has improved the transient and steady-state behavior of the converter in the presence of broad variations in the source voltage and load current.