A soft-switching post-regulator for multi-outputs dual forward DC/DC converter with tight output voltage regulation

被引:23
作者
Su, Bin [1 ,2 ]
Wen, Huiqing [3 ]
Zhang, Junming [2 ]
Lu, Zhengyu [2 ]
机构
[1] State Grid Corp China, Hangzhou Elect Power Bur, Hangzhou 310012, Zhejiang, Peoples R China
[2] Zhejiang Univ, Dept Elect Engn, Hangzhou 310027, Zhejiang, Peoples R China
[3] Xian Jiaotong Liverpool Univ, Dept Elect & Elect Engn, Suzhou 215123, Peoples R China
关键词
SECONDARY-SIDE CONTROL; DC-DC CONVERTER; CROSS-REGULATION;
D O I
10.1049/iet-pel.2012.0516
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
An improved soft-switching post-regulator topology for multi-outputs dual forward DC/DC converter is presented. A delay-trailing modulation method is proposed. ZVSZCS on/zero-current-switching off conditions can be realised on both the primary MOSFETs and the secondary rectifying diodes. Excellent decoupling among different outputs and tight output voltage regulation are achieved. The efficiency is improved due to single power-conversion stage and share in the primary components. The operating principle and main feature of this improved topology are analysed. Key design issue including zero-voltage-switching operation, maximum duty ratio of the primary side MOSFETs and parameter determination for the primary magnetising inductor and the secondary additional redistribution capacitor are discussed. Finally, an experimental prototype with two outputs (300-400 V input, 48 V, 6.5 A and 24 V, 11 A outputs) is built to verify the theoretical analysis. The measured efficiency at normal operation input voltage (400 V) is improved by about 0.5-2%, and the measured efficiency under light loads is improved by more than 2%.
引用
收藏
页码:1069 / 1077
页数:9
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