Synchronous Buck Converter With Output Impedance Correction Circuit

被引：22

作者：

Svikovic, Vladimir ^{[1
]}

Oliver, Jesus A. ^{[1
]}

Alou, Pedro ^{[1
]}

Garcia, Oscar ^{[1
]}

Cobos, Jose A. ^{[1
]}

机构：

[1] Univ Politecn Madrid, Ctr Elect Ind, E-28006 Madrid, Spain

来源：

IEEE TRANSACTIONS ON POWER ELECTRONICS | 2013年 / 28卷 / 07期

关键词：

Additional energy path; output impedance; synchronous buck converter; virtual output capacitor; DC-DC CONVERTER; TRANSIENT-RESPONSE IMPROVEMENT; AUXILIARY CIRCUIT; CAPACITOR CURRENT; PERFORMANCE; FILTER;

D O I：

10.1109/TPEL.2012.2227066

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

This study is related to the improvement of the output impedance of the buck converter by means of introducing an additional power path that virtually increases the output capacitance during transients. It is well known that in voltage regulation module applications, with wide load steps, voltage overshoots and undershoots may lead to undesired performance of the load. To solve this problem, high-bandwidth high-switching-frequency power converters can be applied to reduce the transient time or a big output capacitor can be applied to reduce the output impedance. The first solution can degrade the efficiency by increasing switching losses of the MOSFETS, and the second solution is penalizing the cost and size of the output filter. The output impedance correction circuit, as presented here, is used to inject or extract a current n-1 times larger than the output capacitor current, thus virtually increasing n times the value of the output capacitance during the transients. This feature allows the usage of a low-frequency buck converter with smaller capacitor but satisfying the dynamic requirements.

引用

页码：3415 / 3427

页数：13

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