基于开关流图法Cuk型DC/DC变换器小信号建模  

Small signal modeling on DC/DC Cuk converter with switching flow graph method

作　　者：宋久旭[1] 杨可 刘红霞 李克艰[1] SONG Jiuxu;YANG Ke;LIU Hongxia;LI Kejian(Shaanxi Key Laboratory of Measurement and Control Technology for Oil and Gas Wells,Xi’an Shiyou University,Xi’an Shaanxi 710065,China;Xi’an Microelectronics Technology Institute,Xi’an Shaanxi 710054,China)

机构地区：[1]西安石油大学陕西省油气井测控技术重点实验室,陕西西安710065 [2]西安微电子技术研究所,陕西西安710054

出　　处：《太赫兹科学与电子信息学报》2023年第5期689-695,共7页Journal of Terahertz Science and Electronic Information Technology

基　　金：陕西省重点研发计划项目(2022GY-135);西安石油大学研究生创新与实践能力培养资助项目(0310-312201801)。

摘　　要：Cuk变换器具有输入与输出电流纹波低、能量双向流动等优点,在新能源发电和直流微网中具有良好的应用前景。在分析变换器工作原理的基础上,分别建立导通和截止状态的开关流图;引入以乘法器描述的开关支路模型,推导变换器在整个开关周期的开关流图;对开关支路施加扰动,提取变换器的小信号模型,并应用梅森公式计算变换器的传递函数。采用PSIM软件对变换器小信号模型进行仿真,结果证明了模型的正确性,本文方法对高阶开关变换器建模具有较高的参考价值。Due to the advantages of low ripples in input and output current,and bidirectional energy flowing for the Cuk converter,it shows good application prospects both in new energy generation and DC micro-grid.Based on the analysis of the converter's working principle,the turn-on and turn-off switching flow graphs are established respectively.Then,the switching branch models realized with multipliers to derive the switching flow graph in the whole switching period.Finally,the small signal model of the converter is obtained by imposing disturbance on the switching branches,and the transfer functions of the Cuk converter are calculated with Mason's gain formula.The correctness of the proposed model is proved by simulation results of the AC analysis on the converter,which is implemented with Power Simulation(PSIM)software.The modeling method in this paper has a high reference value for investigations on high order DC/DC converters'modeling.

关 键 词：开关流图法 CUK变换器 小信号模型 仿真验证 

分 类 号：TN712[电子电信—电路与系统]