mko145：
反向恢復慢的二極管1N4007在RCD線路中應用，抑制了初級漏感上的能量引致的諧振（振鈴現象）-1.有助于減小次級輸出的電壓波動。2.大大地減小1MHz~十幾MHz間的EMI噪聲。---------------------------------------------------------------------------------------------------------------EffectsofFastvs.SlowDiodesinClampCircuitAslowreverserecoverydiode(>1us)reducesthefeedbackvoltageringingandimproveoutputregulation.Usingafastdiode(500ns)increasestheamplitudeofringingwhichcanresultinincreasedoutputripple.InFigure15the(larger)ringamplitudewhenusingaFR104dioderepresentsuptoan8%errorinthesampledvoltageoverthetimeperiod2.5usto3.1us.[圖片] 下面摘自ONSemi的AN8461----------------------------------------------------------------------------------------------------------------Thereisadifferenceinringing(andsubsequentlyinradiatedEMI)dependingonusageofTVSclamportheRCDclampwiththe“slow”1N4007.Figures7and8showthedifferenceinringingvoltagesbetweenthetwoimplementations,underthesameinputvoltageandloadconditions.Theringingpeaktopeakvoltageis226VincaseofusetheTVS.ThishighamplitudeofringingisdecreasedbytheusageofRCDclamp,wheretheringingpeak?to?peakvoltageisonly106V.ThisapproachsignificantlyreducestheEMInoiseinfrequencybandfrom1to10MHz.[圖片] [圖片]