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1、,Power ElectronicsLecture(7),Prof.Mohammed Zeki KhedherDepartment of Electrical EngineeringUniversity of Jordan,1,Single-Phase Full-Wave Diode Rectifier,Center-Tap Diode Rectifier,PIV of each diode=,Example 3.The rectifier in Fig.2.8 has a purely resistive load of R Determine(a)The efficiency,(b)For
2、m factor(c)Ripple factor(d)TUF(e)Peak inverse voltage(PIV)of diode D1 and(f)Crest factor of transformer secondary current.,The PIV is,Single-Phase Full Bridge Diode Rectifier With Resistive Load,Example 4 single-phase diode bridge rectfier has a purely resistive load of R=15 ohms and,VS=300 sin 314
3、t and unity transformer ratio.Determine(a)The efficiency,(b)Form factor,(c)Ripple factor,(d)The peak inverse voltage,(PIV)of each diode,and,(e)Input power factor.,The PIV=300V,Input power factor=,Comparision between Single Phase Rectifiers,Half wave Full wave Fullwave center-tap bridgePeak repetitiv
4、e reverse voltage VRRM 3.14Vdc 3.14 Vdc 1.57 VdcRms input voltage per transformer leg Vs 2.22 Vdc 1.11 Vdc 1.11 VdcDiode average current IF.AV.1.00 Idc 0.50 Idc 0.50 IdcDiode rms current IF.RMS.1.57 Idc 0.785 Idc 0.785 IdcForm factor of diode current IF.RMS.1.57 1.57 1.57Rectification ratio 0.405 0.
5、81 0.81Form factor 1.57 1.11 1.11Ripple factor 1.21 0.482 0.482Transformer rating primary VA 2.69 Pdc 1.23 Pdc 1.23 PdcTransformer rating secondary VA 3.49 Pdc 1.75 Pdc 1.23 PdcOutput ripple frequency fr 1 fi 2 fi 2 fi,Multi-phase Rectifier,Three-Phase Half Wave Rectifier,ThePIV of the diodes is,Exa
6、mple A 3-phase star rectifier is operated from 460 V 50 Hz supply at secondary side and the load resistance is R=20.If the source inductance is negligible,determine(a)Rectification efficiency,(b)Form factor(c)Ripple factor(d)Peak inverse voltage(PIV)of each diode.,The PIV=,Vm=650.54V,Three-Phase Ful
7、l Wave Rectifier With Resistive Load,Example 10 The 3-phase bridge rectifier is operated from 460 V 50 Hz supply and the load resistance is R=20ohms.If the source inductance is negligible,determine(a)The efficiency,(b)Form factor(c)Ripple factor(d)Peak inverse voltage(PIV)of each diode.,The PIV=,Vm=650.54V,Single phase rectifier 3 phase rectifier,Performance:,3-phase bridge rectifier with RL load,Condition for continuous load current,谢谢你的阅读,知识就是财富丰富你的人生,docin/sanshengshiyuandoc88/sanshenglu,更多精品资源请访问,
