三开关双Boost高增益DC/DC变换器研究  

Research on three-switch dual Boost high-gain DC/DC converter

作　　者：刘郑心 杜玖玉[1] 于渤洋 LIU Zhengxin;DU Jiuyu;YU Boyang(State Key Laboratory of Automotive Safety and Energy,Tsinghua University,Beijing 100084,China;School of Electrical and Electronic Engineering,Harbin University of Science and Technology,Harbin Heilongjiang 150080,China)

机构地区：[1]清华大学汽车安全与节能国家重点实验室,北京100084 [2]哈尔滨理工大学电气与电子工程学院,黑龙江哈尔滨150080

出　　处：《电源技术》2021年第8期1082-1086,共5页Chinese Journal of Power Sources

基　　金：国家重点研发计划项目(2018YFB0106300)。

摘　　要：燃料电池、光伏发电及电动汽车高电压等级充电系统等应用场合需要高升压比DC/DC变换器,常见的非隔离DC/DC变换器的升压比较低,难以满足实际需求。针对这一问题,提出了一种三开关双Boost高增益DC/DC变换器的拓扑结构,具有结构简单、功率密度高的特点。在分析该变换器工作原理的基础上,利用状态空间平均法建立了变换器小信号模型,并设计了双闭环PI控制器。实验结果表明,所提DC/DC变换器升压比可达到8以上,适合宽输入电压范围和高增益的要求。在系统效率方面,与传统Boost变换器相比,所提出的三开关双Boost结构DC/DC变换器最高效率可达到95.18%,且在相同实验条件下,效率变化范围远小于传统Boost变换器。在双闭环PI控制系统下,该DC/DC变换器具有较好的鲁棒性。Fuel cells,photovoltaic power generation and high voltage charging system of electric vehicles need high boost ratio DC/DC converter.The common non isolated DC/DC converter has low boost,which is difficult to meet the actual demand.According to this problem,this paper proposes a three-switch dual Boost high-gain DC/DC converter with a simple structure and high power density.On the basis of analyzing the operating principle of the proposed converter,a small signal model of the converter is established by the state-space averaging method,and a double closed-loop PI controller is designed.The experimental results show that the proposed DC/DC converter can achieve a boost ratio of more than 8,which is suitable for a wide input voltage range and high gain requirements.In terms of system efficiency,the proposed DC/DC converter with three-switch double Boost structure achieves a maximum efficiency of 95.18%compared to the traditional Boost converter,and the efficiency range is much smaller than that of the traditional Boost converter under the same experimental conditions.In the double closed-loop PI control system,the proposed DC/DC converter has good robustness.

关 键 词：DC/DC变换器 高增益 三开关 鲁棒性 

分 类 号：TM571[电气工程—电器]