中文摘要：

由于Buck变换器具有非线性特性,在一定参数条件下,它会处于混沌状态,此时Buck变换器不能正常工作.为了抑制Buck变换器的混沌现象,本文首先建立了Buck变换器的精确状态方程模型,然后通过分析可控范围图、开关逻辑图、相图、电感电流波形、输出电压波形,研究了基于改善Buck变换器的电感电流与输出电压之间关联性的混沌控制策略.研究结果表明：该控制策略能够将处于混沌状态的Buck变换器稳定在周期1,2,4,8轨道,且该控制策略不需要预先确定期望的目标轨道,不依赖于Buck变换器的电路参数,只取决于一个外部参数即耦合强度,所以该控制策略同样适用于其他拓扑结构的功率变换器.

英文摘要：

Due to the strong nonlinearity of the Buck converter, it can be in the chaotic state under certain parameters and the chaotic Buck converter does not work normally. In order to suppress the chaotic phenomena in the Buck converter, a chaotic control scheme is demonstrated by establishing the accurate state equation models, and then analyzing the controllable range diagrams, the switching logic diagrams, the phase portrait, the inductor current waveforms and the output voltage waveforms. Also this scheme can be im- plemented by improving the correlation between the inductor current and the output voltage of the Buck converter. Research results show that this scheme can stabilize the chaotic Buck converter to the period-1, period-2, period-4, period-8 orbits, without determining the desired targeting orbits in advance. Moreover, this scheme does not depend on circuit parameters of the Buck converter, it only depends on an external parameter named the coupling strength, so this scheme can be applied to the other power converters.