homefree：
dc-dcboostconverter,inmostofcase,hasgooddcinput.andthePFC,inmostofcase,hasfullwaverectifierinput,(becauseoftheinputcapacitorvalueshouldbelow,andforfilterswichingfrequencyonly).Thismakesthecalculationofpfcchokeratherbothersome.Furthermore,somepfcic(likeL6561/2)hasvariableswitchingfrequency(switchingfrquencyishighatinputwavelowend,andislowaroundpeakofinputwave).sorrymyOShastroubletokey-inChinese.