Boost变换器负调电压建模分析

摘要 以电容电压作为输出反馈的Boost变换器是一个非最小相位系统，非最小相位反应引起的负调严重的影响系统的暂态性能及稳态性能。研究引起负调与变换器参数之间的关系对Boost变换器优化设计是一个关键问题。本文根据Boost变换器小信号数学模型推导给出非最小相位系统的负调电压表达式，指出衡量负调电压的两个指标：负调电压大小和负调电压峰值时间。根据负调电压表达式分析了输入电压、储能电感、占空比、占空比变化量、负载、滤波电容等参数对负调电压的影响。研究结果表明：输入电压和占空比变化量仅影响负调电压大小；储能电感、占空比、负载、滤波电容不仅影响负调的大小，同时影响负调的峰值时间。研究所得结论为Boost变换器的参数优化设计以及减小负调电压提高系统暂态性能及稳态性能提供了理论依据。仿真和实验结果验证了理论分析的正确性。

Analysis of key parameters for Boost converter negative voltage

Abstract: Taking the capacitor voltage as the Boost converter output feedback is a non-minimum phase system, The non-minimum phase responded causes negative accent serious influence system transition condition performance and stable state performance. Study on the relationship between negative and cause the converter parameters optimization design of Boost converter is a key problem. According the negative voltage regulating expression of the Boost converter small signal model is deduced for non-minimum phase system. It is pointed out that the two indicators to measure the negative voltage, Negative voltage and negative tone peak voltage. According the expression of negative adjustable voltage of input voltage, inductor, duty ratio, the influence of duty ratio variation, load, filter capacitance on negative voltage. The research results show that: The input voltage and the duty ratio variation affects only the negative voltage size, The energy storage inductor, duty ratio, load, filter capacitor affects not only the negative regulation size, at the same time effect on peak time negative tone, Research conclusions for the parameter optimization design of Boost converters and decrease the negative voltage and provides a theoretical basis to improve the system transient performance and steady state performance, The simulation and experimental results verify the correctness of the theory analysis.