单周期控制Cuk变换器的启动问题与解决方案

Solution to Start-up Issue of One-cycle Controlled Cuk Converter

开关变换器的单周期控制技术具有动态响应快、开关频率固定、输入扰动抑制能力强等特点.将单周期控制用于一些拓扑结构较复杂的变换器时,会给变换器的启动带来问题.首先分析了单周期控制Cuk变换器的启动问题,然后结合变换器的全局稳定性,采用固定占空比控制的辅助方案,很好地解决了启动问题,实现了Cuk变换器的单周期控制.最后对提出的解决方案进行了仿真分析和实验验证,仿真和实验结果均表明解决方案是正确与有效的.

One-cycle control technique for switched converter is characterized of fast dynamic response,constant switch frequency,good suppression of input perturbation.Start-up issue appears when one-cycle control is employed in some converters with complex topology.At the beginning of this paper,start-up issue of one-cycle controlled Cuk converter was analyzed.Then with consideration of global stability,start-up issue was solved and one-cycle controlled Cuk converter was realized by using the auxiliary scheme of constant duty-ratio control.Finally,simulation analysis and experiment was carried out,and the strategy was confirmed to be correct and effective by the results of simulation and experiment.