本文论述在闭环反馈控制下，输入环节工作在不连续导电模式（ＤＣＭ） 时单级功率因数校正（ＰＦＣ） 组合变换器的稳定性，讨论通过脉冲宽度调节使变换器的输出电压能够维持在期望的电压范围之内的条件，以及满足条件的输入电压动态范围和负载变化范围．并采用上述方法对一个ＰＦＣＤＣＭｂｏｏｓｔｂｕｃｋ 变换器进行了理论分析与实验研究，实验结果表明理论分析的正确性 This article discusses the stability of a single-stage PFC combiner with an input connected to a discontinuous conduction mode (DCM) under closed-loop feedback control. It is discussed that the output voltage of the converter can be maintained at the desired level Of the voltage range of the conditions, and to meet the conditions of the input voltage dynamic range and load range. And a PFCDCMboostbuck converter is used in the theoretical analysis and experimental research. The experimental results show that the theoretical analysis is correct