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Unit 2.Converter and Chopper fed Dc drives
- 1. SOLID STATE DRIVES UNIT–II CONVERTER / CHOPPER FED DC MOTOR 1 1 Dr.A.Ravi, Professor, Electrical and Electronics Engineering Francis Xavier Engineering College,Tirunelveli
- 2. TYPES OF DCDRIVES Dr.A.Ravi, Francis Xavier Engineering College,Tirunelveli 2 Phase controlled rectifier fed DC drives According to the input supply • Single phase Rectifier •Three phase Rectifier According to the quadrant •One Quadrant •Two quadrant •Four Quadrant Chopper fed DC drives •One Quadrant •Two quadrant •Four Quadrant
- 3. Dr.A.Ravi, Francis XavierEngineering College,Tirunelveli 3 Here AC supply is fed to the phase controlled rectifier circuit.AC supply may be single phase or three phase.Phase controlled rectifier converts fixed AC voltage into variable DC voltage .
- 4. SINGLE PHASE CONTROLLEDRECTIFIER FED SEPARATELY EXCITED DC MOTOR DRIVES Dr.A.Ravi, Francis Xavier Engineering College,Tirunelveli 4
- 5. SINGLE PHASE CONTROLLEDRECTIFIER FED SEPARATELY EXCITED DC MOTOR DRIVES Dr.A.Ravi, Francis Xavier Engineering College,Tirunelveli 5
- 6. SINGLE PHASE HALFWAVE CONTROLLED RECTIFIER FED DC DRIVES (ONE QUADRANT CONVERTER) Dr.A.Ravi, Francis Xavier Engineering College,Tirunelveli 6
- 7. SINGLE PHASE HALFWAVE CONTROLLED RECTIFIER FED DC DRIVES (ONE QUADRANT CONVERTER) Dr.A.Ravi, Francis Xavier Engineering College,Tirunelveli 7
- 8. SINGLE PHASE HALFWAVE CONTROLLED RECTIFIER FED DC DRIVES (ONE QUADRANT CONVERTER) Dr.A.Ravi, Francis Xavier Engineering College,Tirunelveli 8
- 9. SINGLE PHASE HALFWAVE CONTROLLED RECTIFIER FED DC DRIVES (ONE QUADRANT CONVERTER) Dr.A.Ravi, Francis Xavier Engineering College,Tirunelveli 9
- 10. SINGLE PHASE FULLYCONTROLLED RECTIFIER FED DC DRIVES Dr.A.Ravi, Francis Xavier Engineering College,Tirunelveli 10 Discontinuous Continuous
- 11. SINGLE PHASE FULLYCONTROLLED RECTIFIER FED DC DRIVES Dr.A.Ravi, Francis Xavier Engineering College,Tirunelveli 11 Discontinuous Load current is Discontinuous
- 12. SINGLE PHASE FULLYCONTROLLED RECTIFIER FED DC DRIVES Dr.A.Ravi, Francis Xavier Engineering College,Tirunelveli 12
- 13. SINGLE PHASE FULLYCONTROLLED RECTIFIER FED DC DRIVES Dr.A.Ravi, Francis Xavier Engineering College,Tirunelveli 13 Continuous Load current is continuous Firing angel <90 degree
- 14. SINGLE PHASE FULLYCONTROLLED RECTIFIER FED DC DRIVES Dr.A.Ravi, Francis Xavier Engineering College,Tirunelveli 14 Continuous Load current is continuous Firing angel >90 degree
- 15. SINGLE PHASE FULLYCONTROLLED RECTIFIER FED DC DRIVES Dr.A.Ravi, Francis Xavier Engineering College,Tirunelveli 15
- 16. SINGLE PHASE FULLYCONTROLLED RECTIFIER FED DC DRIVES Dr.A.Ravi, Francis Xavier Engineering College,Tirunelveli 16
- 17. SINGLE PHASE FULLYCONTROLLED RECTIFIER FED DC DRIVES Dr.A.Ravi, Francis Xavier Engineering College,Tirunelveli 17
- 18. SINGLE PHASE FULLYCONTROLLED RECTIFIER FED DC DRIVES Dr.A.Ravi, Francis Xavier Engineering College,Tirunelveli 18 Speed –torque characteristics
- 19. THREE PHASE FULLYCONTROLLED RECTIFIER FED DC DRIVES Dr.A.Ravi, Francis Xavier Engineering College,Tirunelveli 19 two quadrant converter the average output voltage is either positive or negative `but average output current is always positive.
- 20. Dr.A.Ravi, Francis XavierEngineering College,Tirunelveli 20
- 21. CHOPPER FED DCDRIVES Dr.A.Ravi, Francis Xavier Engineering College,Tirunelveli 21 First Quadrant or Type-A or Motoring Chopper During ON time Current flow from Supply,Switch,Motor, Inductor charged During OFF time Inductor polarity Reversed, Diode FB , Current circulated diode and DC motor
- 22. CHOPPER FED DCDRIVES Dr.A.Ravi, Francis Xavier Engineering College,Tirunelveli 22 Second Quadrant or Type –B or Regenerative braking Chopper
- 23. CHOPPER FED DCDRIVES Dr.A.Ravi, Francis Xavier Engineering College,Tirunelveli 23 TYPE-C- chopper or Two Quadrant type A chopper drive
- 24. CHOPPER FED DCDRIVES Dr.A.Ravi, Francis Xavier Engineering College,Tirunelveli 24 TYPE-C- chopper or Two Quadrant type A chopper drive Forward Motoring Mode When the chopper CH1 is on, the supply voltage is fed to the motor armature terminals and therefore the armature current increases. Here the voltage and current is always positive. Therefore the motor rotates in forward direction. When CH1 is in an off state ,Ia freewheels through diode D1 and therefore ia decreases. It is the forward motoring mode. It is first quadrant operation. Forward Braking Mode When chopper CH2 is in an ON state, the motor acts as a generator and armature current Ia increases. Due to this energy is stored in the armature inductance.
- 25. CHOPPER FED DCDRIVES Dr.A.Ravi, Francis Xavier Engineering College,Tirunelveli 25 TYPE-D- chopper or Two Quadrant type B chopper drive
- 26. CHOPPER FED DCDRIVES Dr.A.Ravi, Francis Xavier Engineering College,Tirunelveli 26 TYPE-D- chopper or Two Quadrant type B chopper drive Forward motoring mode When the chopper CH1 and CH2 on, the motor rotates in the forward direction and ia increases. When CH1 is in an off state ,now the current flows through CH2 and diode D1.Here the output voltage current is always positive .It gives forward motoring mode chopper. Reverse Braking Mode When both the choppers CH1 and CH2 are off, the current will flows through the diode Di and D2. Here the output current is positive and output voltage is negative. i.e., power flows from load to source. Here we can achieve the reverse braking mode. It is the fourth quadrant operation. It is shown in fig. Here the motor speed can be controlled by changing the duty cycle of the chopper.
- 27. CHOPPER FED DCDRIVES Dr.A.Ravi, Francis Xavier Engineering College,Tirunelveli 27 Four quadrant Chopper or Type E Chopper
- 28. CHOPPER FED DCDRIVES Dr.A.Ravi, Francis Xavier Engineering College,Tirunelveli 28 Four quadrant Chopper or Type E Chopper
- 29. FOUR QUADRANT CONVERTERFED DC DRIVES Dr.A.Ravi, Francis Xavier Engineering College,Tirunelveli 29
- 30. FOUR QUADRANT CONVERTERFED DC DRIVES Dr.A.Ravi, Francis Xavier Engineering College,Tirunelveli 30