研究磁变阻尼器性能优化问题,分析了负载为磁流变阻尼器的 Buck 变换器的动态工作过程,为系统实现减振效果,给出了不另加滤波电感的原冈.基于三端 PWM 开关模型法,建立了电流驱动器的小信号平均模型,列出了占空比对输出电压、电感电流的传递函数.根据峰值电流模式下 Buck 变换器的工作原理,分别分析了电流内环和电压外环.同时设计了斜坡补偿电路和电压补偿网络.根据变换器工作原理,在 Saber 中建立了峰值电流模式下 Buck 变换器模型,并进行了仿真研究,仿真结果表明了建模设计方法的正确性性和可行性,这将为磁流变阻尼器电流驱动器设计提供了新思路和方法,也将缩减了电流驱动器电路设计的开发周期.%The operating processes of the Buck converter with Magneto-theological(MR) damper as its load was rnanalyzed, and the reason for omitting the filter inductor was given. Based on the three-terminal PWM switch model rnmethod, the small-signal model of the current driver was built, and then the transfer functions of duty cycle to output rnvoltage and inductor current were listed. Baaed on the operation principle of Buck convener with peak current mode, rnthe characteristics of current inner loop and voltage loop were analyzed, at the same time, the slope compensation cirrncuit and voltage compensation network were designed. Based on the operation principal of Uc3842, the model of Buck rnconvener with peak current mode was built in Saber, and then the simulation was studied. The result of simulation rnshows the effectiveness and feasibility of modeling design method. So this modeling design method will provide new rnapproach for designing current driver for MR dampers, and reduce the development cycle of current driver design.
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