推挽正激变换器的建模与控制研究  

Research of Modeling and Control on Push-Pull Forward Converter

作　　者：李美芳[1] 牟宪民[1] 

机构地区：[1]大连理工大学,辽宁大连116023

出　　处：《电测与仪表》2013年第6期104-108,共5页Electrical Measurement & Instrumentation

摘　　要：本文给出了可用于隔离型逆变器前级DC/DC环节的方案—推挽正激变换器,通过研究隔离式DC/DC变换器的基本原理,在低频、小信号、小纹波条件下,利用状态空间平均法建立小信号模型。然后采用MATLAB软件进行辅助分析,设计了补偿电路,在此基础上搭建了推挽正激变换器的电压型闭环控制系统。最后进行了仿真和实验验证,实验结果表明所设计系统(样机)具有良好的动态性能和稳定性,进而验证了数学模型的正确性,采用控制策略的合理性以及设计方案的可行性。This paper presents a push-pull forward converter,which can be used for the pre-isolated inverter and has some superiority in low voltage and high current situation.According to the principle of isolated DC/DC converter,small signal math model of PPF converter is established by using state-space averaging method under the assumption conditions of low-frequency,small signal and small ripple wave.Then the MATLAB software is used to carry through the assistant analysis,and design the control parameters and automatic closed control system based on the theoretical analysis.Finally,the simulation and experimental results show that the system（prototype）has perfect dynamic and static character,which verifies the validity of the mathematical model and the feasibility of the control strategy.

关 键 词：高频逆变 推挽正激 小信号分析 SG3525 

分 类 号：TM46[电气工程—电器]