IC693MDL733RR 电机相电流由一个传感器(分流电阻)测量,并流经一个抗混叠滤波器,供应给Σ-Δ ADC。然后,1位数据流输入两个sinc滤波器,一个针对P控制器调谐,另一个针对I控制器调谐。为简明起见,图8省去了Clark和Park变换。然而,电流控制是在一个旋转dq框架中完成。
为了评估电流反馈分为两条路径的影响,我们对该闭环执行了稳定性分析。对于传统的Z域分析,sinc滤波器会带来问题。它会引入一个延迟,对于任何实际抽取率,该延迟小于一个采样周期。例如,若系统以fsw = 10 kHz的速率运行,滤波器延迟将短于100 μs。从控制环路方面看,sinc模块是一个小数延迟滤波器。为了模拟小数延迟,将sinc滤波器近似看作一个全通滤波器。在为奈奎斯特频率一半的较低频率时,该近似处理,但在更高的频率,其与理想滤波器有一些偏差。然而,这里的目的是了解双反馈如何影响环路稳定性,就此而言,该近似是合适的。
IC693MDL733RR作为对比,显示了反馈路径(无双反馈)中仅使用一个sinc滤波器时的闭环幅度响应。开关频率fsw为10kHz,奈奎斯特频率设置为5 kHz。在这些系统参数下,对于0 μs至80 μs的sinc滤波器群延迟,绘制闭环响应曲线。注意,群延迟与抽取率直接相关。同预期一样,低抽取率和群延迟对闭环稳定性的影响很小,但随着延迟增加,系统阻尼变得越来越小。
IC693MDL733RR
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