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POWER ELECTRONICS

POWER ELECTRONICS. CIRCUITS, DEVICES, AND APPLICATIONS Eng.Mohammed Alsumady. EPE 352 POWER ELECTRONICS. DC-DC CONVERTERS. 11/15/2014. 2. Step Down Converter. Constant frequency operation Variable frequency operation. 11/15/2014. 3. PWM Waveform Generation.

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POWER ELECTRONICS

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  1. POWER ELECTRONICS CIRCUITS, DEVICES, AND APPLICATIONS Eng.Mohammed Alsumady

  2. EPE 352POWER ELECTRONICS DC-DC CONVERTERS 11/15/2014 2

  3. Step Down Converter • Constant frequency operation • Variable frequency operation 11/15/2014 3

  4. PWM Waveform Generation • which is also called the modulation voltage, M 11/15/2014 4

  5. Step Down Operation with RL Load 11/15/2014 5

  6. Step Down Operation with RL Load 11/15/2014 6

  7. Modes of Operation 7 11/15/2014

  8. Modes of Operation 11/15/2014 8

  9. Discontinuous Operation • For a continuous load current 11/15/2014 9

  10. Step-Up Operation • The average output voltage 11/15/2014 10

  11. Step-Up Operation • For controllable power 11/15/2014 11

  12. Step-Up Operation 11/15/2014 12

  13. Converter Classifications • 1st Quadrant converter • 2nd Quadrant converter • 1st and 2nd quadrant • 3rd and 4th quadrant • Four-quadrant 11/15/2014 13

  14. 1st Quadrant Converter • Both the voltage and the current are positive 11/15/2014 14

  15. 2nd Quadrant Converter • The voltage is positive and the current is negative 11/15/2014 15

  16. 2nd Quadrant Converter 11/15/2014 16

  17. 1st and 2nd Quadrant Converter • S1 and D4 • S4 and D1 11/15/2014 17

  18. 3rd and 4th Quadrant Converter • S3 and D2 • S2 and D3 11/15/2014 18

  19. Four Quadrant Converter 11/15/2014 19

  20. Switching Mode Regulators • Buck Regulator • Boost Regulator • Buck-Boost Regulator • Cuk Regulator 11/15/2014 20

  21. Buck Regulator 11/15/2014 21

  22. Buck Regulator • The critical values for a continuous inductor current and • capacitor voltage 22 11/15/2014

  23. Boost Regulator 11/15/2014 23

  24. Boost Regulator • The critical values for a continuous inductor current and capacitor voltage 11/15/2014 24

  25. Buck-Boost Regulator 11/15/2014 25

  26. Buck-Boost Regulator • The critical values for a continuous inductor current and capacitor voltage 11/15/2014 26

  27. Cuk Regulator 11/15/2014 27

  28. Cuk Regulator 11/15/2014 28

  29. Cuk Regulator • The critical values for a continuous inductor • current and capacitor voltage 11/15/2014 29

  30. Rectified Fed Converter 11/15/2014 30

  31. Input Filter 11/15/2014 31

  32. Summary • A dc-dc can convert a fixed dc voltage to a variable dc voltage. • A four-quadrant converter allows power flow to and from load. • Switching mode converter can produce output voltage higher and lower than the input voltage. • The rectifier fed boost converter is commonly used for unity power factor correction (UPFC). 11/15/2014 32

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