A robust dynamic controller design of synchrous buck converter for extreme loaded condition [articol]

Abstract

Buck converters are the powering unit for consumer and medical electronics systems however they will have considerable switching and power losses. The power losses occurring on diodes in such converter can be avoided by designing Synchronous Buck Converter (SBC). In this proposed work two types of controller namely dual loop and Dynamic Evolution (DE) control is designed for SBC. Dual loop control has very faster response with very good set point tracking for normal load variations. But for drastic load variations or extreme load conditions; the controller performance of dual loop controller degrades. SBC with DE control however provides robust performance for drastic load variations. This robust performance measures are compared with Simulink as well as hardware results. In this paper, the drastic load changes are designed in hardware circuit using a programmable switch to create a load variation environment and the SBC with proposed DE controller is tested for robustness in this environment. The efficiency of proposed controller has been found to be greater than any conventional converter with satisfied performance measures.