10.1.1单相桥式整流电路OLJ2V2.V和IT0.9V2VL=0.9V2V =-" /2.V, sin ot dotOwtDrD/D2D4/D,D,D2D4导通导通导通导通元2V2TrL~0.9VaIDI-3元~220VD50Hz0.9VWI电网0U1R,R.ULiL电压RbID2-43.纹波系O数K=0.483V.5.最大反向电压4.平均整流电流VRM =V2V,V2=0.45ID = ID3 = ID2 = I D4RHOME
V V t t 2 sin d π1 2 π0 L LL L RV I 0.483 L 2 L 22 r V V V K 2 π2 2 V 2 0.9V L 2 0.9RV D1 D3 I I D2 D4 I I L2 L 0.45 21 RV I RM 2 V 2 V
滤波电路10.1.2几种滤波电路LRC2C1O.(b)(a)(c)电容滤波电路ad(b）（倒L型）电感电容滤波电路（c）Ⅱ型滤波电路HOME
(+)Tr滤波电路10.1.2a220V50Hz电容滤波电路+01CUL+RLV2VLVCR未接入R接入后C放电C充电VC=ULV2Va0c=V2V1Va13元14元TLat10ID.IDDID2/DDDD导导导导！02=/2V2sint电电！电UrotULitR1nHOMEee18elat
滤波电路10.1.2IV2VL-VCR.未接入R接入后C放电C充电电容滤波的特点Ue=UVEVaA.二极管的导电角0<元100=V2V,1流过二极管的瞬时电流V314元1oDatDDID很大。DD3DD1导导导导02=V2 Vesin ot电电电电B.负载直流平均电压VL升高+tTa=RC越大，VL越高otVLLRC.直流电压VL随负载电流增加而减少GI[e]1e98-时VL=（1.1当≥（3~51.2)V2HOME
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