Generalized Circuit Averaging Technique for Two Switch DC-DC Converters

TL;DR

This paper introduces a generalized circuit averaging method for two-switch DC-DC converters like Cuk and SEPIC, enabling simplified analysis and simulation of their frequency response and behavior in different conduction modes.

Contribution

It develops a unified averaging technique applicable to two-switch converters, providing analytical models and simulation tools for their dynamic behavior.

Findings

Derived equations for frequency response of Cuk and SEPIC converters.

Validated models through LTSpice simulations in CCM and DCM.

Generalized approach applicable to various two-switch power converters.

Abstract

Cuk and SEPIC are some of the important DC-DC converters used for charging batteries. In this paper, a generalized circuit averaging technique is employed for Cuk and SEPIC converters. The derived equations are used to obtain the frequency response of open loop transfer function. The ratio of perturbed output voltage to duty cycle ($G_{vd}$) is simulated using LTSpice software package. The derived averaged models of the converters aids in faster and simpler simulation. The behavior of the converters in CCM and DCM was also simulated. The derived expressions can be generalized to power converters with two switches.