Power electronics, notes (1 to 5)_ part_1, Lecture notes of Power Electronics

Download Power electronics, notes (1 to 5)_ part_1 and more Lecture notes Power Electronics in PDF only on Docsity! These Slides are Prepared By: Professor Dr Md Abdur Razzak Head of the Department, EEE Independent University of Bangladesh Lecture – 3 AC-DC Converters (Diode Rectifiers) Prof. Abdur Razzak EEE 332/413 Lecture 3 Page 1/20 EEE 332 / 413 (POWER ELECTRONICS AND DRIVES) Lesson Outcomes After completing this lecture, students will be able to  explain the working principle and modeling of different types of ac-dc converters including single- phase and three-phase diode rectifiers.  design ac-dc converters with specific requirements.  apply ac-dc converters for battery charging and other applications. Prof. Abdur Razzak EEE 332/413 Lecture 3 Page 4/20 Half-wave and full wave rectifier with resistive load and filter Input HWR output t t vi(t) 0 0 Vm vo(t) FWR output t0 vo(t) 1 cycle Ripple Ripple Prof. Abdur Razzak EEE 332/413 Lecture 3 Page 5/20 Rectifier parameters Rectifier efficiency: Form factor (measure of the shape of output voltage): Ripple factor (measure of ripple content): Transformer utilization factor: Crest factor: Harmonic factor or Total Harmonic Distortion (THD): rmsrms dcdc ac dc IV IV P P  dc rms V V FF   1FF1/RF 22  dcrms VV ss dc IV P TUF 1THD)(or HF 2 1 2 1 2 1 2            s s s ss I I I II s peaks I I )( CF  Prof. Abdur Razzak EEE 332/413 Lecture 3 Page 6/20 Rectifier parameters (contd..) Displacement factor (measure of the distortion of a waveform): Power factor: cosDF   coscosPF 11 s s ss ss I I IV IV  Prof. Abdur Razzak EEE 332/413 Lecture 3 Page 9/20 Example: 3-1 solution (contd..) (c) PIV of the diode: (d) Crest factor: Power factor: (e) Power factor angle: mVPIV 2 2/ / CF )(  RV RV I I m m s peaks         707.0 2/2/ /2/ 2/2/ / PF 2 2   RVV RV RVV RV IV P mm m mm rms ss ac     011 450.707cosPFcos   Prof. Abdur Razzak EEE 332/413 Lecture 3 Page 10/20 Example: 3-2 Problem: The full-wave rectifier shown in Fig. has a purely resistive load. Determine:  Efficiency,   FF, RF & TUF  PIV of the diode  CF & PF  power factor angle Prof. Abdur Razzak EEE 332/413 Lecture 3 Page 11/20 Example: 3-2 solution  Rectification efficiency:  Form factor:  Crest factor:  Ripple factor:  PIV of the diode: %3.57 22 2 / 2 2//TUF 2                      R VV R V IVPVAP mm m ssdcdc  mV2PIV  2 2/ / CF )(  RV RV I I m m s peaks      707.0 2/2/2 /2/ 2 PF 2   RVV RV IV P VA P mm m ss acac  Transformer utilization factor:  Power factor:     %0.81 /2/ //2 2 2  RV RV P P m m ac dc  11.122//FF  dcrms VV   %2.48111.11FFRF 22  Prof. Abdur Razzak EEE 332/413 Lecture 3 Page 14/20 Full wave rectifier with highly inductive load Determine the (i) THD of input current, & (ii) input PF. where       ..5,3,1 sincos n nndcs tnbtnaIti      0 2 1 2 0          tdtiI sdc       0cos 2 cos 1 0 2 0                ttdnIttdntia asn             n I ttdnIttdntib aasn 4 sin 2 sin 1 0 2 0                    .... 5 5sin 3 3sin 1 sin4 tttI ti as   2 4 1  a s I I  a a s I I I                             .. 7 1 5 1 3 1 1 2 4 222  48.01 4 2 1 THDor HF 22 1                   a a s s I I I I  9.00cos 2 4 cosPF 01  a a s s I I I I   Prof. Abdur Razzak EEE 332/413 Lecture 3 Page 15/20 Three-phase half-wave rectifier (star rectifier)  tVV mA sin  0120sin  tVV mB   0240sin  tVV mC  ?DCV Assignment: 3-2 Prof. Abdur Razzak EEE 332/413 Lecture 3 Page 16/20 Three-phase full-wave rectifier  tVV mA sin  0120sin  tVV mB   0240sin  tVV mC    mmDC VtdtVV     2 33 sin3 3/ 1 3/ 0   Prof. Abdur Razzak EEE 332/413 Lecture 3 Page 19/20 References 1. M. H. Rashid, Power Electronics – Circuits, Devices & Applications, 4th Ed, Pearson, pp. 103–157. Prof. Abdur Razzak EEE 332/413 Lecture 3 Page 20/20 Next lecture! DC-DC Converters