一种高增益软开关直流变换器的分析与设计
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Analysis and Design of High-gain Soft-switching DC/DC Converter
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Project supported by National Natural Science Foundation of China(51577019)

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    摘要:

    在无需变压器隔离的光伏并网发电系统中,在光伏电池和并网逆变器之间须采用非隔离DC/DC变换器完成高增益变换。为此,提出了一种高增益软开关直流变换器,在相同电压增益条件下,其相对于传统升压变换器具有占空比更低、开关损耗更小、电压应力更低的优势。在分析变换器工作原理的基础上,对其性能进行了详细分析,最后搭建了一台48 V输入、380 V输出、额定功率为250 W的试验样机,实测最高效率为92.48%,实验结果验证了理论分析的正确性。

    Abstract:

    In a transformer-less photovoltaic(PV) grid-connected power generation system, the transformation with a high voltage gain is realized by means of a non-isolated DC/DC converter between the PV cell and the grid-connected converter. In this context, a high-gain soft-switching DC/DC converter is proposed in this paper. Compared with the conventional Boost converter, this converter has advantages of a lower duty cycle, a smaller switching loss, and a lower voltage stress under the same voltage gain condition. Based on the analysis of the operating principle for the proposed converter, its performance is analyzed in detail. Finally, a 250 W prototype with 48 V input and 380 V output was built, and its highest measured efficiency was about 92.48%. Experimental results verified the correctness of the theoretical analysis.

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胡宇婷,谌思,罗全明.一种高增益软开关直流变换器的分析与设计[J].电源学报,2022,20(2):17-25

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  • 收稿日期:2019-10-24
  • 最后修改日期:2020-01-06
  • 录用日期:2020-01-06
  • 在线发布日期: 2022-04-15