Switched-inductor semi-quadratic buck converter

Abstract

A switched-inductor semi-quadratic buck converter is a modification of two-switch semi-quadratic fifth-order buck converter which belongs to the minimum-phase family. An L — switching structure is combined with the semi-quadratic buck converter in order to get high voltage conversion ratio. Moreover, it gives more bucking than the semi-quadratic buck converter. The superiority of the proposed converter is mainly based on less energy stored in the inductors. The current stress in the switching elements is less, which results in lower conduction losses. Salient performance features like voltage bucking, switching stress, inductor current etc. of proposed converter is compared with that of a semi-quadratic buck converter. In this work, simulations of both the buck topologies are presented and these are done using MATLAB/Simulink software. A prototype of 5W, 20 kHz switched-inductor semi-quadratic buck converter is designed, analysed and implemented using PIC16F877A.