【摘要】 利用谐波平衡法对Buck变换器中的倍周期分岔进行了仿真研究,首先给出了连续控制模式下电压控制型Buck变换器的动力学模型,然后采用谐波平衡法进行分析,获得了产生倍周期分岔的充要条件,同时也得到了分岔的准确位置。基于这个分岔条件,可以设计一个前馈控制来避免倍周期分岔的发生。此控制法有利于输入电压工作范围的大幅度扩大,以及较好的输出电压校准。更多还原

【Abstract】 The period doubling bifurcation in buck converters is studied using the harmonic balance method. A dynamic model of a buck converter in continuous conduction mode under voltage mode control is derived.An exact harmonic balance analysis is used to obtain a necessary and sufficient condition for a period doubling bifurcation to occur and provide information on its exact location.Using the condition for bifurcation, a feedforward control is designed that eliminates a period doubling bifurcation.This results in a wider range of allowed source voltage,and also in improved output voltage regulation.更多还原