A circuit-oriented geometrical approach in predicting subharmonic oscillation of dc-dc converters with voltage-mode control

Author

Lin Cheng ; Wing-Hung Ki

Author_Institution

Dept. of Electron. & Comput. Eng., Hong Kong Univ. of Sci. & Technol., Hong Kong, China

fYear

2014

fDate

1-5 June 2014

Firstpage

962

Lastpage

965

Abstract

This paper presents a circuit-oriented geometrical approach in predicting subharmonic oscillation of DC-DC converters with voltage-mode control. It is based on straightforward graphical analysis of the operation of the converter without using sophisticated mathematical tools. The critical condition of subharmonic oscillation of the buck converter is derived, which is shown to be related to the slope of the output of the compensator V_ea at the trip point rather than the amplitude of the ripple voltage of V_ea. The proposed analysis is verified for converters with a proportional or a Type-III compensator.

Keywords

DC-DC power convertors; power conversion harmonics; voltage control; DC-DC converter; Type-III compensator; buck converter; circuit oriented geometrical approach; graphical analysis; proportional compensator; subharmonic oscillation prediction; voltage mode control; Capacitors; Chaos; Inductors; Mathematical model; Oscillators; Switches; Voltage control;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems (ISCAS), 2014 IEEE International Symposium on

Conference_Location

Melbourne VIC

Print_ISBN

978-1-4799-3431-7

Type

conf

DOI

10.1109/ISCAS.2014.6865297

Filename

6865297