An Improved Zero-Voltage Switching Inverter Using Two Coupled Magnetics in One Resonant Pole

被引:101
作者
Yu, Wensong [1 ,2 ]
Lai, Jih-Sheng [1 ,2 ]
Park, Sung-Yeul [1 ,2 ]
机构
[1] Virginia Polytech Inst & State Univ, Bradley Dept Elect & Comp Engn, Blacksburg, VA 24061 USA
[2] Virginia Polytech Inst & State Univ, Future Energy Elect Ctr, Blacksburg, VA 24061 USA
基金
美国国家科学基金会;
关键词
Coupled magnetics; inverter; load adaptability; zero-current switching (ZCS); zero-voltage switching (ZVS);
D O I
10.1109/TPEL.2009.2030197
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
A novel soft-switching inverter using two small coupled magnetics in one resonant pole is proposed to ensure the main switches operating at zero-voltage switching from zero load to full load and the auxiliary switches at zero-current switching with load adaptability and small current stress. Since independent coupled magnetics structure avoids the unwanted magnetizing current freewheeling loop, the size of the coupled magnetics can be minimized with low magnetizing inductance, and the saturable inductor can be eliminated. Detailed circuit operation is described, and voltage-second balance condition of the magnetics is expressed mathematically. A 4-kW hardware prototype has been designed, fabricated, and tested to verify the validity of the novel circuit and the improved performance of the proposed soft-switching inverter. Experimental results show an excellent agreement with analytical results. Since the measured efficiency from 20% to 100% load consistently shows above 97.8% and peaks at 98.2%, the proposed inverter is very attractive for high-efficiency applications where energy saving is a major concern.
引用
收藏
页码:952 / 961
页数:10
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