1. Chapter 6 DC-to-DC Converters 1 “Introduction to Modern Power Electronics”, 2 nd Ed., John Wiley 2010 by Andrzej M. Trzynadlowski

2. Static dc switch based on a fully controlled semiconductor power switch Chapter 62 Fig. 6.1

3. Voltage and current waveforms in a static dc switch Chapter 63 Fig. 6.2

4. SCR-based static dc switch with a resonant commutating circuit Chapter 64 Fig. 6.3

5. Subcircut of an SCR-based static dc switch Chapter 65 Fig. 6.4

6. Voltage and current waveforms in an SCR- based static dc switch Chapter 66 Fig. 6.5

7. Step-down chopper: (a) block diagram, (b) equivalent circuit for the dc output voltage and current Chapter 67 Fig. 6.6

8. First-quadrant chopper Chapter 68 Fig. 6.7

9. Equivalent circuits of the first-quadrant chopper: (a) state 1, (b) state 0 Chapter 69 Fig. 6.8

10. Example waveforms of output voltage and current in a first-quadrant chopper Chapter 610 Fig. 6.9

11. Single cycle of the output voltage and current in a first-quadrant chopper Chapter 611 Fig. 6.10

12. Current ripple in a chopper as a function of the magnitude control ratio and switching frequency Chapter 612 Fig. 6.11

13. Second-quadrant chopper Chapter 613 Fig. 6.12

14. Equivalent circuits of a second-quadrant chopper: (a) state 1, (b) state 0 Chapter 614 Fig. 6.13

15. Waveforms of output voltage and current in a second-quadrant chopper Chapter 615 Fig. 6.14

16. First-and-second-quadrant chopper Chapter 616 Fig. 6.15

17. Waveforms of output voltage and current in a first-and-second-quadrant chopper Chapter 617 Fig. 6.16

18. First-and-fourth-quadrant chopper Chapter 618 Fig. 6.17

19. Equivalent circuits of a first-and-fourth-quadrant chopper operating in the fourth-quadrant: (a) state 2, (b) state 0 Chapter 619 Fig. 6.18

20. Waveforms of output voltage and current in a first-and-fourth-quadrant chopper Chapter 620 Fig. 6.19

21. Four-quadrant chopper Chapter 621 Fig. 6.20

22. Chapter 622

23. Allowable ranges of the magnitude control ratio in step-down choppers Chapter 623 Fig. 6.21

24. Step-up chopper Chapter 624 Fig. 6.22

25. Waveforms of the output voltage and input current in a step-up chopper (d = 0.75) Chapter 625 Fig. 6.23

26. Typical supply system of a chopper Chapter 626 Fig. 6.24

27. DC drive with a chopper with a braking resistor Chapter 627 Fig. 6.25