单周期控制Cuk变换器的一种实现策略及降频现象分析

An Implementation Strategy for One-cycle Controlled Cuk Converter and Analysis of Reducing Frequency Phenomenon

开关变换器的单周期控制技术具有动态响应快、跟踪性能好、控制简单等特点。该文在考虑了Cuk变换器启动过程及全局稳定性的基础上,采用固定占空比控制与单周期控制相结合的策略,实现了Cuk变换器的单周期控制。同时也对控制模式切换点选择不当时出现的降频现象进行了分析。仿真和实验结果证明了分析的正确性和控制策略的有效性。

One-cycle control technique for switched converters features fast dynamic response,good tracking performance,simple control and so on.In this paper,with considerations of start-up process and global stability of Cuk converter,the strategy of combining constant duty-ratio control and one-cycle control was employed,then one-cycle controlled Cuk converter was realized.Meanwhile,reducing frequency phenomenon due to the inappropriate selection of exchange point of control modes was analyzed.The analysis and control strategy was confirmed to be correct and effective by the results of simulation and experiment.