A Current-Driving Synchronous Rectifier for an LLC Resonant Converter With Voltage-Doubler Rectifier Structure

被引：78

作者：

Zhang, Junming ^{[1
]}

Liao, Jiawen ^{[2
]}

Wang, Jianfeng ^{[1
]}

Qian, Zhaoming ^{[1
]}

机构：

[1] Zhejiang Univ, Coll Elect Engn, Hangzhou 310027, Peoples R China

[2] Chongqing Elect Power Corp, Elect Power Res Inst, Chongqing 400000, Peoples R China

来源：

IEEE TRANSACTIONS ON POWER ELECTRONICS | 2012年 / 27卷 / 04期

关键词：

Current driving; LLC resonant converter; synchronous rectifier (SR); voltage doubler; SCHEME;

D O I：

10.1109/TPEL.2011.2167520

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 paper proposes a current-driving scheme for a synchronous rectifier (SR) in an LLC resonant converter with a voltage-doubler rectifier. In the proposed scheme, only one current transformer (CT) with one secondary winding is used to drive two SRs in the voltage-doubler rectifier. Also, the sensed current from the CT can be fed to the output with an energy-recovery circuit. Compared to the conventional center-tapped rectifier, the CT count for the SR drive circuit is reduced, which saves both cost and space. Although the current rating of the SR in the voltage-doubler rectifier is doubled, the voltage rating is well reduced and a lower voltage rating device with lower ON-state resistance can be used to compensate the increased current rating. Furthermore, the SR voltage stress is well clamped to the output voltage under any condition which improves the reliability of the circuit. A prototype with 16 V/5.6 A output was built to verify the theoretical analysis.

引用

页码：1894 / 1904

页数：11

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