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UNIT II

UNIT II. PHASE CONTROLLED CONVERTERS. Phase-Control Converters. Single-Phase. Three-Phase. Semiconverter. Semiconverter. Full converter. Full converter. Dual converter. Dual converter. Semiconverter ..is a one-quadrant converter and it has one polarity. Full converter

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UNIT II

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  1. UNIT II PHASE CONTROLLED CONVERTERS

  2. Phase-Control Converters Single-Phase Three-Phase Semiconverter Semiconverter Full converter Full converter Dual converter Dual converter EE2301- POWERELECTRONICS

  3. Semiconverter ..is a one-quadrant converter and it has one polarity Full converter ..is a two-quadrant converter and the polarity of its output can be either positive or negative. However the output current of full converter has one polarity only Dual converter ..can operate in four quadrants ; both the output voltage and current can be either positive or negative EE2301- POWERELECTRONICS

  4. EE2301- POWERELECTRONICS

  5. Average Output Voltage Maximum Output Voltage Normalizing Output Voltage RMS Output Voltage EE2301- POWERELECTRONICS

  6. If the converter has a purely resistive load of R and the delay angle is , determine (a) the rectification efficiency (b) the form factor FF (c) the ripple factor RF and (d) the peak inverse voltage PIV of thyristor T1 EE2301- POWERELECTRONICS

  7. EE2301- POWERELECTRONICS

  8. If the converter has a purely resistive load of R and the delay angle is , determine (a) the rectification efficiency (b) the form factor FF (c) the ripple factor RF and (d) the peak inverse voltage PIV of thyristor T1 EE2301- POWERELECTRONICS

  9. If the converter has a purely resistive load of R and the delay angle is , determine (a) the rectification efficiency (b) the form factor FF (c) the ripple factor RF and (d) the peak inverse voltage PIV of thyristor T1 EE2301- POWERELECTRONICS

  10. Semiconverter EE2301- POWERELECTRONICS

  11. Single-Phase Semiconverter EE2301- POWERELECTRONICS

  12. Mode 1 Mode 2 Single-Phase Semiconverter (RL-load) EE2301- POWERELECTRONICS

  13. RMS Current for Thyristor RMS Current for Thyristor RMS Output Current AVG Output Current Single-Phase Semiconverter (RL-load) EE2301- POWERELECTRONICS

  14. The single-phase semiconverter has an RL load of L = 6.5mH, R = 2.5 Ohm, and E = 10 V. The input voltage is VS = 120 V(rms) at 60 Hz. Determine (a) the load current IL0 at , and the load current IL1 at , (b) the average thyristor current IA (c) the rms thyristor current IR (d) the rms output current Irms and (e) the average output current Idc EE2301- POWERELECTRONICS

  15. Rectification Mode Inversion Mode Single-Phase Full Converter EE2301- POWERELECTRONICS

  16. Single-Phase Full Converter EE2301- POWERELECTRONICS

  17. Single-Phase Full Converter (RL-load) Mode 1 = Mode 2 EE2301- POWERELECTRONICS

  18. Single-Phase Full Converter (RL-load) RMS Current for Thyristor RMS Current for Thyristor RMS Output Current AVG Output Current EE2301- POWERELECTRONICS

  19. Dual Converter EE2301- POWERELECTRONICS

  20. Single-Phase Dual Converter High-Power Variable-Speed Drives EE2301- POWERELECTRONICS

  21. Three-Phase Semiconverter EE2301- POWERELECTRONICS

  22. 3 Phase Controlled Rectifiers • Operate from 3 phase ac supply voltage. • They provide higher dc output voltage. • Higher dc output power. • Higher output voltage ripple frequency. • Filtering requirements are simplified for smoothing out load voltage and load current. EE2301- POWERELECTRONICS

  23. Extensively used in high power variable speed industrial dc drives. • Three single phase half-wave converters can be connected together to form a three phase half-wave converter. EE2301- POWERELECTRONICS

  24. 3-Phase Half Wave Converter(3-Pulse Converter) with RL LoadContinuous & ConstantLoad Current Operation EE2301- POWERELECTRONICS

  25. EE2301- POWERELECTRONICS

  26. Vector Diagram of 3 Phase Supply Voltages EE2301- POWERELECTRONICS

  27. 3 Phase Supply Voltage Equations EE2301- POWERELECTRONICS

  28. EE2301- POWERELECTRONICS

  29. van vbn vcn van EE2301- POWERELECTRONICS

  30. Each thyristor conducts for 2/3 (1200) Constant Load Current io=Ia Ia Ia EE2301- POWERELECTRONICS

  31. To Derive an Expression for the Average Output Voltage of a 3-Phase Half Wave Converter with RL Loadfor Continuous Load Current EE2301- POWERELECTRONICS

  32. EE2301- POWERELECTRONICS

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  35. EE2301- POWERELECTRONICS

  36. EE2301- POWERELECTRONICS

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  39. 3 Phase Half Wave Controlled Rectifier Output Voltage Waveforms For RL Load atDifferent Trigger Angles EE2301- POWERELECTRONICS

  40. =300 =600 EE2301- POWERELECTRONICS

  41. =900 EE2301- POWERELECTRONICS

  42. 3 Phase Half Wave Controlled Rectifier With R Load andRL Load with FWD EE2301- POWERELECTRONICS

  43. EE2301- POWERELECTRONICS

  44. 3 Phase Half Wave Controlled Rectifier Output Voltage Waveforms For R Load or RL Load with FWDatDifferent Trigger Angles EE2301- POWERELECTRONICS

  45. =00 =150 EE2301- POWERELECTRONICS

  46. =300 =600 EE2301- POWERELECTRONICS

  47. To Derive An Expression For The Average Or Dc Output Voltage Of A 3 Phase Half Wave Converter With Resistive Load Or RL Load With FWD EE2301- POWERELECTRONICS

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