Charge control: modeling, analysis, and design

Author

Tang, Wei ; Lee, Fred C. ; Ridley, Raymond B. ; Cohen, Isaac

Author_Institution

Bradley Dept. of Electr. Eng., Virginia Polytech. Inst. & State Univ., Blacksburg, VA, USA

Volume

8

Issue

4

fYear

1993

fDate

10/1/1993 12:00:00 AM

Firstpage

396

Lastpage

403

Abstract

There are many ways to use the inductor current of a PWM converter as part of its feedback control mechanism. A simple and widely used method is peak current-mode control which uses the instantaneous inductor current as part of the control signals. Charge control is a special type of current-mode control. It uses the integration of the on-time inductor current as the feedback control signal. The characteristics of charge control are studied. A complete small-signal analysis is performed for the control scheme. Subharmonic oscillation similar to that of peak current-mode control is found, and the relationship between subharmonic oscillation and the line/load condition of charge control is defined. Based on the analysis, design guidelines which guarantee the stability of the control system under given line and load ranges are proposed. The small-signal model was confirmed experimentally

Keywords

electric current control; feedback; inductors; power convertors; pulse width modulation; PWM converter; feedback control mechanism; feedback control signal; inductor current; instantaneous inductor current; line/load condition; on-time inductor current; peak current-mode control; small-signal analysis; subharmonic oscillation; Buck converters; Control systems; Guidelines; Inductors; Performance analysis; Pulse width modulation converters; Stability analysis; Steady-state; Switches; Voltage control;

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/63.261009

Filename

261009