A single - stage pfc converter combines the pfc stage and a dc / dc converter into one stage with a shared switch and controller . implements the input current shape and provide tight output regulation . the advantages and disadvantages of pfc approachs are analyzed and compared 单级pfc变换器把pfc级和dc / dc级集成在一起，共用开关管和控制电路，同时实现输入电流的整形和对输出电压的调节。
