Diode-Circuits-or-Uncontrolled-Rectifier---University-of-Jordan二极管电路或不控整流-35页PPT课件

1、Power ElectronicsLecture (7)Prof. Mohammed Zeki KhedherDepartment of Electrical EngineeringUniversity of Jordan1Single-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)

2、 Form 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

3、=300 sin 314 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 ce

4、nter-tap bridgePeak repetitive 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

5、1.57Rectification ratio 0.405 0.81 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 fiMulti-phase RectifierThree-Phase Half Wave Rectifi

6、er ThePIV of the diodes is Example 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

7、diode.The PIV=Vm=650.54V Three-Phase Full 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 rectifierPerformance:3-phase bridge rectifie