文档介绍：南京航空航天大学
硕士学位论文
Buck-Boost变换器的研究
姓名:李宇
申请学位级别:硕士
专业:电机与电器
指导教师:王慧贞
20060201
南京航空航天大学硕士学位论文
摘要
一种新的高可靠性飞机专用电源系统,需要研制一种大功率宽电压输入范
围的DC/DC变换器电源。在充分考虑不同DC/DC变换器拓扑特点的基础上,本
文选用了Buck-Boost作为系统的主电路拓扑。
本文介绍了Buck-Boost电路的工作原理,建立了非理想Buck-Boost平均法的
模型,对整个电路进行了单电压闭环参数设计的研究,实现了控制理论中零极
点补偿法在电力电子中的应用,建立了闭环小信号模型,总结了设计校正网络
的步骤和具体方法。在利用MATLAB设计出校正网络的传递函数后,又在电路
上验证了校正网络参数选择的正确性。接着,本文给出了540W
27-270VDC/28VDC变换器的设计过程,并进行了损耗分析。
为了使系统能够在宽电压输入范围内稳定正常工作,本文实现了提出的变
传递函数系统校正方法在电力电子闭环参数设计中的应用,并与闭环参数设计
方法进行了比较,指出了该方法的优点,并通过仿真和实验验证了该方法的正
确性。
关键字:Buck-Boost,DC/DC变换器,闭环设计,宽电压输入范围,非理想数学
模型

i
Buck-Boost 变换器的研究
ABSTRACT
DC/DC converter with high power and wide range input voltage was required for
more reliable special aero-power systems. parison of characteristics for
different DC/DC topologies, Buck-Boost converter was selected as main topology of
the power system.
The working principle of Buck-Boost is first introduced, and averaging model of
non-ideal Buck-Boost converter is established. The design details for voltage loop
were given and zero-pensation method from classic control theory was
applied to the filed of power electronics. Thus, small-signal model of closed-loop was
established, with detailed design guidelines for work. Base on the
above-mentioned analysis and also with the help of MATLAB simulation, transfer
function of the work was designed. Then experimental results verify
correctness of work’s parameters. Besides, the design procedure and power
loss analysis were given for a Buck-Boost converter of 540kW 27-270VDC/28VDC.
By using the correction approach of vary-transfer function for designing
parameter of closed-loop in the area of power electronics, the system could work
reliably under wide range input voltage conditions. Compared with the design method
of closed-loop parameter, the advantages of the correction approach of vary-transfer
function were highlighted and testified