A Parallel Hybrid Soft Switching Converter with Low Circulating Current Losses and a Low Current Ripple

被引:1
作者
Lin, Bor-Ren [1 ]
Chen, Jia-Sheng [1 ]
机构
[1] Natl Yunlin Univ Sci & Technol, Dept Elect Engn, Yunlin, Taiwan
关键词
Hybrid converter; Phase-shift PWM; Soft switching; Three-level converter; DC-DC CONVERTER; 3-LEVEL CONVERTER; ZERO-VOLTAGE; DC/DC CONVERTER; LOAD RANGE; ZVS; DESIGN;
D O I
10.6113/JPE.2015.15.6.1429
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 new parallel hybrid soft switching converter with low circulating current losses during the freewheeling state and a low output current ripple is presented in this paper. Two circuit modules are connected in parallel using the interleaved pulse-width modulation scheme to provide more power to the output load and to reduce the output current ripple. Each circuit module includes a three-level converter and a half-bridge converter sharing the same lagging-leg switches. A resonant capacitor is adopted on the primary side of the three-level converter to reduce the circulating current to zero in the freewheeling state. Thus, the high circulating current loss in conventional three-level converters is alleviated. A half-bridge converter is adopted to extend the ZVS range. Therefore, the lagging-leg switches can be turned on under zero voltage switching from light load to full load conditions. The secondary windings of the two converters are connected in series so that the rectified voltage is positive instead of zero during the freewheeling interval. Hence, the output inductance of the three-level converter can be reduced. The circuit configuration, operation principles and circuit characteristics are presented in detail. Experiments based on a 1920W prototype are provided to verify the effectiveness of the proposed converter.
引用
收藏
页码:1429 / 1437
页数:9
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