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Superbuck电路的稳定性分析

, PP. 480-487

Keywords: Superbuck,双电感型Buck,阻尼回路,电源控制器

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Abstract:

Superbuck变换器具有输入输出电流连续的特点,属于高阶变换器拓扑。当主电路参数选择不当的时候会引起变换器小信号模型中存在右半平面(RHP)零点,从而增加控制系统设计的难度。本文采用增加阻尼回路的方法,针对Superbuck电路拓扑提出了一种消除其模型中右半平面零点的阻尼参数设计方法,以此提高变换器的稳定性。本文分析了Superbuck电路的小信号模型,给出了变换器模型避免RHP零点时主电路参数匹配的条件。由于占空比过大时,参数的匹配条件难以满足。为此本文通过计算变换器加入阻尼回路之后的小信号模型,得到了在主电路参数确定情况下消除RHP零点的参数设计方法,从而降低了变换器内部谐振,放宽了参数设计的约束条件,由此简化了控制器设计,提高变换器的稳定性。本文通过模型计算和实验伯德图测定表明了理论分析的正确性。

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