Practical switch based state-space modeling of DC-DC converters with all parasitics

Author

Rim, Chun T. ; Joung, Gyu B. ; Cho, Gyu H.

Author_Institution

Korea Adv. Inst. of Sci. & Technol., Seoul, South Korea

Volume

6

Issue

4

fYear

1991

fDate

10/1/1991 12:00:00 AM

Firstpage

611

Lastpage

617

Abstract

All parasitics such as switch conduction voltages, conduction resistances, switching times, and ESRs of capacitors are counted in a proposed DC-DC power convertor state-space modeling based method on nonideal switching functions. An equivalent simplified model is derived from the complex circuit with parasitics. The modeling procedure is shown for the buck-boost converter as the general converter among the buck, boost, and buck-boost converters. The pole frequency, DC voltage gain, and efficiency are analyzed and verified by experiments that show good agreement with theory. The procedures for determining the gain margin of the controller, the turn ratio of an isolation transformer, the optimum duty factor, and the switching frequency are given for an example flyback converter

Keywords

equivalent circuits; power convertors; state-space methods; switching; DC voltage gain; DC/DC power convertors; boost; buck; buck-boost; capacitors; conduction resistances; conduction voltages; duty factor; efficiency; gain margin; isolation transformer; parasitics; pole frequency; state-space modeling; switching times; turn ratio; Capacitors; DC-DC power converters; Frequency conversion; Performance gain; Switches; Switching circuits; Switching converters; Switching frequency; Switching systems; Voltage;

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/63.97759

Filename

97759