A High-Frequency Model for a PCM Buck Converter

Author

Shen Xu ; Fei Li ; Yunpeng Yao ; Shengli Lu ; Weifeng Sun

Author_Institution

Nat. ASIC Syst. Eng. Res. Center, Southeast Univ., Nanjing, China

Volume

30

Issue

4

fYear

2015

fDate

Apr-15

Firstpage

2304

Lastpage

2312

Abstract

In order to analyze the high-frequency behaviors of the peak current mode (PCM) Buck converter, a small-signal multifrequency model is proposed. The multifrequency model explains the influences from the sideband frequency components generated by the nonlinear PWM comparator. It can effectively reflect some features which cannot be shown by the conventional average model, such as the phase delay. In addition, based on the proposed model, the sample-hold effect is also introduced and analyzed in this paper. Through the derivation and validation of the new model, frequency characteristics of the PCM Buck converter can be well understood, especially in the high-frequency region.

Keywords

current-mode circuits; power convertors; sample and hold circuits; PCM buck converter; frequency characteristics; high-frequency behaviors; high-frequency model; nonlinear PWM comparator; peak current mode buck converter; phase delay; sample-hold effect; sideband frequency components; small-signal multifrequency model; Amplitude modulation; Bandwidth; Inductors; Phase change materials; Pulse width modulation; Switching frequency; Transfer functions; Multifrequency model; Small-signal mode; peak current mode (PCM); sample-hold effect;

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/TPEL.2014.2325412

Filename

6819856