mindriver：
Usually,therearetwowaystoachievetheanti-striationforAChighfrequencyballast.ThefirstwaycouldbetodirectlyimposeaDCcomponentonlampcurrent.ButifexistingaDCblockcapacitorinserieswithlamp,itwillbeofnoeffect.Thesecondwaycouldbeofasymmetricalhalfbridgeoperation,inotherwords,thehalfbridgeisworkinginnon_50%dutycycleonpurpose.Inthisasymmetricaloperation,althoughtheDCcomponentisblockedsincecapacitor,thelampcurrentshapeofpositivehalf-cycleisslightlydifferentfromthatofnegativehalf-cycle. Forinstance,thepositivepeakoflampcurrentisdifferentfromthenegativepeak.Sothat,thestriationisdisappeareddramatically.