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EMI產生分析及無Y電容充電器設計TheEMIdesignofthechargerwithoutYCapacitorAdlsongAbstract:SomegeneralknowledgeofEMIisintroducedinthispaper.ThebasicprincipleofcausingdifferentialmodeandcommonmodecurrentrelatedconductedemissionsofEMIintheswitchmodepowersupplyisdiscussedindetailthroughtherelevantcircuittheoriesandthesketchdiagrams.Thedesignofthecancellationinsidethestructureofthetransformerisalsopresentedandexplainedbythesketchdiagram.ThemethodsforreducingradiatedemissionsofEMIaredescribedaswelltoo.Intheendthedesignforcommonmodeinductorisoffered.Atpresent,YcapacitoriswidelyadoptedinsideSMPSincludingthecellphonechargertopassEMItests.TheusageofYcapacitorleadstotheleakagecurrentfrominputlinestooutp……