一种高增益软开关直流变换器的分析与设计  

Analysis and Design of High-gain Soft-switching DC/DC Converter

作　　者：胡宇婷 谌思 罗全明[1] HU Yuting;CHEN Si;LUO Quanming(State Key Laboratory of Power Transmission Equipment&System Security and New Technology(Chongqing University),Chongqing 400044,China)

机构地区：[1]输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆400044

出　　处：《电源学报》2022年第2期17-25,共9页Journal of Power Supply

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。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.

关 键 词：高增益 倍压单元 软开关 升压变换器 

分 类 号：TM46[电气工程—电器]