The multi-frequency small-signal model for buck and multiphase interleaving buck converters

Author

Qiu, Yang ; Xu, Ming ; Yao, Kaiwei ; Sun, Juanjuan ; Lee, Fred C.

Author_Institution

Center for Power Electron., Virginia Polytech. Inst. & State Univ., Blacksburg, VA, USA

Volume

1

fYear

2005

fDate

6-10 March 2005

Firstpage

392

Abstract

This paper introduces a multi-frequency small-signal model for buck and multiphase interleaving buck converters. Including the influences from the sideband-frequency components generated by the pulse-width modulation (PWM), this model is applicable beyond half of the switching frequency. In voltage-mode-controlled buck converters, the proposed model predicts the measured phase delay, while the conventional average model fails to explain this phenomenon. With this new model, frequency-domain characteristics are clearly explained for buck and multiphase buck converters. Furthermore, the aliasing effect at half of the switching frequency is examined. Simulation and experimental results are presented to verify the proposed multi-frequency model.

Keywords

PWM power convertors; frequency-domain analysis; phase measurement; switching convertors; voltage control; PWM; multifrequency small-signal model; multiphase interleaving buck converters; phase delay measurement; pulse-width modulation; sideband-frequency components; switching frequency; voltage-mode-controlled buck converters; Buck converters; Delay; Interleaved codes; Phase measurement; Predictive models; Pulse generation; Pulse width modulation; Space vector pulse width modulation; Switching frequency; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Applied Power Electronics Conference and Exposition, 2005. APEC 2005. Twentieth Annual IEEE

Print_ISBN

0-7803-8975-1

Type

conf

DOI

10.1109/APEC.2005.1452961

Filename

1452961