【作者】 艾国昌；

【导师】 吕振；

【作者基本信息】 辽宁工程技术大学 ， 电力电子与电力传动， 2009， 硕士

【摘要】 双向DC/DC变换器,可以在需要能量双向流动的场合代替两个并联的单向DC/DC变换器,可以减小设备体积和重量,降低成本。符合当今电源系统小型化,低成本,高频化和高效化的发展趋势。本文首先阐述了双向DC/DC变换器的概念、原理,并结合其应用场合描述其具体工作方式,接着针对直流不间断电源的要求设计了一种正向推挽升压,反向全桥降压的拓扑结构,可以实现软开关。当处于正向工作模式时,随着低压侧开关管交替导通,高压侧的串联谐振实现电流过零,这时低压侧的电流几乎为零,从而实现了软开关;当处于反向工作模式时,在相移全桥的基础上在输出续流回路中引入了辅助电感,通过续流时产生感应电动势使原边电流复位,从而实现零电流关断。并应用Pspice仿真软件对电路原理分析进行仿真验证。本文还研究了针对该拓扑结构的带预测修正的参数模糊自适应PID控制方法,并对控制效果进行了仿真验证。参数模糊自适应PID可以使PID控制参数针对当前输出信号的变化进行在线调整,通过对下一周期输出值的修正预测能够补偿控制器的滞后时延,该预测值考虑当前的不确定环境因素可以提高预测精度。最后以TI公司的TMS320LF2407DSP为控制芯片,进行了软件设计。实验样机输出的稳定波形验证了本文的双向DC/DC变换器的可行性。更多还原

【Abstract】 Bi-directional DC/DC Converter can be used to replace two parallel DC/DC converter in the situation which need two-way flow of energy,so it can reduce the size and weight of equipment, and lower the costs. It is in the line with the trend that present power source is needed miniaturization, low-cost, high-frequency-based and efficient.At first, the conception and principle of the Bi-directional DC/DC converter are presented,and its work in definite applications is explained. A novel topological structure of Bi-directional DC/DC Converter is designed, which is used in uninterruptible power supply system. When it is working in the mode of positive direction, converter voltage by transformer series resonant implementation of current zero, and the current of low voltage side reduce to almost zero, then achieve soft switches; When it is working in reverse mode, a auxiliary inductance is added to output proper path, during the follow current period, the auxiliary inductor brings induction electromotive force to reset primary current, so achieve soft switches.And then the theories were tested by Pspice simulation software.This article also studied the revised forecast and fuzzy adaptive parameters of PID control methods, and simulated by simulink to test effect of control. Fuzzy adaptive PID can adjust the parameters of PID timely for the current output signal changes. The output in the next cycle will be predicted and amended so it can compensate the lag time, the predicted values considered uncertain environmental factors so its predictive can be improved. Finally , TMS320LF2407DSP of TI company was used for chip of circuit, and the software design was carried out.更多还原