摘要
在设计和分析平均电流控制型功率因数校正(PFC)Boost变换器时,通常假设其工作在电流连续模式下,而采用电流连续模式下的平均模型分析变换器的动力学特性.而实际的变换器可能工作在电流断续状态,当变换器负载较小时,电流断续状态更加明显.因此,采用电流连续状态下的平均模型无法准确描述变换器的特性,尤其是混沌和分岔现象.本文采用考虑电流断续工作状态的状态空间模型,对PFC变换器中的低频分岔现象进行了分析,得到了低频分岔图,使该变换器由倍周期分岔到达混沌的路径更加清楚,使人们可以更全面理解这种变换器的动力学行为.并从分岔的角度分析了变换器的稳定性.其结果表明,变换器的输出电容和负载对变换器的稳定性具有很强的影响.通过给出的参数分岔图和二维参数与稳定性的映射图,为更好地设计变换器提供了指导.仿真分析结果和实验结果表明了本文所提方法的合理性和结果正确性.
It is conventionally assumed that the average current controlled Power Factor Correction （PFC） boost converter operates in Continuous Conduction Mode （CCM）, and hence the average CCM model is used for analyzing the dynamics of the converter. In fact, the converter might work in Discontinuous Conduct Mode （DCM）, especially,in the light load condition. Therefore, the average CCM model cannot predict the dynamical characteristics accurately, especially bifurcation and chaos phenomena. The state space model, which covers possible DCM operation,is employed to investigate the low frequency bifurcation of the PFC converter. Low frequency bifurcation diagram is derived, which makes the route from period doubling bifurcation to chaos clear and makes a better understanding of the dynamics of the converter. The stability of the converter is investigated from the viewpoint of bifurcation, whose results show that the output capacitance and the load make great contributions to the stability of the converter. One dimensional bifurcation diagram and two dimensional parameters stability map give the hint to better understand and design the converter. The consistence of the simulation results and experiment results shows that the proposed method is reasonable and the results are correct.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2006年第5期784-789,共6页
Acta Electronica Sinica
基金
陕西省自然科学基金(No.2003F028)
关键词
电力电子变换器
功率因数校正
电流断续模式
分岔
混沌
power electronics converter
power factor correction
discontinuous conduct mode
bifurcation
chaos
