中文摘要：

在连续导电模式（CCM）时,V2控制Buck变换器的控制性能主要取决于输出电容的时间常数。基于离散映射模型,利用分岔图研究了输出电容时间常数较小时,电感与负载电阻对V2控制Buck变换器的动力学特性影响。结果表明,当时间常数较小时,V2控制Buck变换器工作在断续导电模式（DCM）次谐波或CCM混沌振荡状态,通过选择较小的电感或较大的负载电阻,该变换器将工作在正常的DCM周期振荡状态。PSIM电路仿真验证了分岔分析的正确性。

英文摘要：

When operating in continuous conduction mode（ CCM）,the control performance of V2- controlled buck converter mainly depends on the time constant of the output capacitor. Based on the discrete mapping model,the dynamics effects of inductance and load resistance on characteristics of V2- controlled buck converter with small time constant output capacitor are investigated by using the bifurcation diagrams. The study results indicate that when the time constant is small,V2- controlled buck converter operates in discontinuous conduction mode（ DCM）subharmonic or CCM chaotic oscillation states,through selecting smaller inductance or bigger load resistance,the converter will operate in normal DCM periodic oscillation state. PSIM circuit simulations verify the validity of bifurcation analysis.