Modeling of a SEPIC converter operating in discontinuous conduction mode

Eng, Vuthchhay; Bunlaksananusorn, Chanin

doi:10.1109/ECTICON.2009.5136983

Modeling of a SEPIC converter operating in discontinuous conduction mode

Author(s)

Eng, Vuthchhay

Bunlaksananusorn, Chanin

Date Issued

October 22, 2009

Type

Conference Paper

DOI

10.1109/ECTICON.2009.5136983

Abstract

A SEPIC (Single-Ended Primary Inductor Converter) DC-DC converter is capable of operating in either step-up or step-down mode and widely used in battery-operated equipment. There are two possible modes of operation in the SEPIC converter: Continuous Conduction Mode (CCM) and Discontinuous Conduction Mode (DCM). This paper presents modeling of a SEPIC converter operating in DCM using the State-Space Averaging (SSA) technique. The modeling leads to a small-signal linear model of the converter, from which the transfer functions used for feedback control design can be determined. It is found that the derived model is a reduced-order model, which can accurately predict the converter's characteristics up to one-tenth of the switching frequency. ©2009 IEEE.

Citation

2009 6th International Conference on Electrical Engineering Electronics Computer Telecommunications and Information Technology Ecti Con 2009, 1, 140-143, 2009