Investigation on the Ripple Voltage and the Stability of SR Buck Converters With High Output Current and Low Output Voltage

被引：16

作者：

Jinno, Masahito ^{[1
]}

Chen, Po-Yuan ^{[1
]}

Lai, Yu-Chun ^{[1
]}

Harada, Koosuke ^{[2
]}

机构：

[1] I Shou Univ, Dept Elect Engn, Dashu Township 840, Kaohsiung, Taiwan

[2] Sojo Univ, Energy Elect Lab, Kumamoto 860, Japan

来源：

IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS | 2010年 / 57卷 / 03期

关键词：

Ripple ratio; stability; synchronous rectifier (SR); voltage regulator; ACTIVE-CLAMP; VRM; CONDUCTION;

D O I：

10.1109/TIE.2009.2029510

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

0812 ;

摘要：

Synchronous rectifiers (SRs) composed of MOSFETs have recently been employed to replace the conventional rectifiers with diodes. SRs are widely used in switched-mode power supplies with low output voltage and high output current for efficiency improvement. Owing to the high-efficiency characteristic, it is adequate to use an SR buck converter in a voltage regulator for powering a central processing unit. Normally, such SR buck converter must operate at fairly high switching frequency for miniaturizing a whole circuit and achieving a fast response. However, at the conditions of low output voltage, high output current, and high switching frequency, the influence of parasitic elements to circuit operation will become extremely obvious. Therefore, the design considerations concerning the ripple voltage and the stability of such SR converters should be carefully investigated and clarified. By establishing the equivalent circuit and using a state-space averaged method, the ripple ratio of output voltage and the static and dynamic characteristics of the SR buck converter with nonnegligible parasitic elements are obtained. Thus, the design criteria concerning the output ripple voltage and the stability are clarified.

引用

页码：1008 / 1016

页数：9

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