上海交通大学学报

上海交通大学学报

• •    

双变压器型串联谐振变换器全范围软开关设计（网络首发）

  

  1. 1. 常熟理工学院电气与自动化工程学院；2. 澳门科技大学创新工程学院；3. 东南大学电气工程学院

Dual-transformer Series Resonant Converter with Full Range ZVS Operation

  1. (1. School of Electrical Engineering and Automation, Changshu Institute of Technology, Suzhou 215000, Jiangsu, China; 2. Faculty of Innovation Engineering, Macau University of Science and Technology, Macau 999078, China; 3. School of Electrical Engineering, Southeast University, Nanjing 210000, China)

PDF (PC)

29

摘要： 为了解决双有源桥变换器(DAB)回流功率过大，轻载下失去零电压开关(ZVS)运行的问题，提出双变压器型串联谐振变换器(DTSRC)。该变换器采用双变压器结构，变压器两端所受电压应力减小。通过设计高频变压器变比系数k，DTSRC在轻载下能够保证开关管实现ZVS运行，减小了变换器开关损耗。同时，采用最小电流轨迹(MCT)控制策略，二次侧实现同步整流，消除了回流功率，减小了变换器导通损耗。实验表明：DTSRC的开关管在全范围下满足ZVS运行，整体运行效率超过90%。

关键词: 串联谐振变换器, 零电压开关, 最小电流, 开关损耗, 导通损耗

Abstract: A dual-transformer series resonant converter (DTSRC) is presented to enhance operating efficiency and widen soft-switching ranges. The dual-transformer structure is employed on the proposed converter, which can significantly reduce voltage stress across the transformers. Additionally, ZVS operation under light-load conditions is achieved and switching loss is minimized by designing the turns ratio coefficient k. To eliminate backflow power and reduce conduction loss, a minimum current trajectory (MCT) control strategy is implemented for DTSRC. Thus, synchronous rectification is realized on the secondary side, which makes the converter always operate with minimum current. Experimental results demonstrate that ZVS of all active switches is achieved during full power ranges. The operating efficiency of DTSRC is greatly improved.

Key words: series resonant converter, zero voltage switching, minimum current, switching loss, conduction loss

中图分类号: