摘要
在考虑采样保持器的作用下,建立了数字控制Buck变换器系统的z域模型,由此揭示了系统发生低频分岔现象的原因.根据系统特征值的变化趋势,预测了该数字控制变换器失稳时分岔点的位置和类型,同时,推导出系统发生低频振荡的频率以及振幅,即系统波动方程.最后,通过PSpice电路仿真实验验证了理论分析结果的合理性与有效性.
The z-domain model of digitally controlled Buck converter is derived by only considering the effect of sampler-and-holder. Based on the z-domain model, the cause of the low-frequency bifurcation is analyzed. The location and type of the bifurcation point when a system loses stability is predicted in terms of the system eigenvalues. Moreover, the frequency and the amplitude of the low-frequency oscillation, i.e., the wave equations, are deduced. These theoretical results are verified by PSpice simulations.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2008年第10期6174-6181,共8页
Acta Physica Sinica
基金
国家自然科学基金(批准号:50607015)
高等学校博士学科点专项科研基金(批准号:20050698004)
陕西省自然科学基金(批准号:2006E113)资助的课题.~~
关键词
低频振荡
数字控制
变换器
z域模型
low-frequency oscillation, digitally control, converter, z-domain model
