Chapter 5 AC-to-AC Converters

1. Chapter 5AC-to-AC Converters “Introduction to Modern Power Electronics”, 2nd Ed., John Wiley 2010 by Andrzej M. Trzynadlowski

2. Single-phase ac voltage controller Fig. 5.1 Chapter 5

3. Waveforms of output voltage and current in a single-phase ac voltage controller (): (a) , (b) Fig. 5.2 Chapter 5

4. Envelope of control characteristics,), of a single-phase ac voltage controller Fig. 5.3 Chapter 5

5. Operation of a single-phase ac voltage controller with (a) single-pulse gate signal, (b) multipulse gate signal Fig. 5.4 Chapter 5

6. Definition of a control angle Fig. 5.5 Chapter 5

7. Envelope of control characteristics, ), of a single-phase ac voltage controller Fig. 5.6 Chapter 5

8. Fully controlled three-phase ac voltage controller Fig. 5.7 Chapter 5

9. Voltage and current distribution in a fully controlled three-phase ac voltage controller: (a) two triacs conducting, (b) three triacs conducting Fig. 5.8 Chapter 5

10. Output voltage waveforms in a fully controlled three-phase ac voltage controller: (a) , (b) (R load) Fig. 5.9 Chapter 5

11. Polarities of output voltages and currents in a fully controlled three-phase ac voltage controller in mode 2 before firing triac TA (solid line) and following the firing (broken line) Fig. 5.10 Chapter 5

12. Output voltage waveforms in a fully controlled three-phase ac voltage controller: (a) , mode 2, (b) Fig. 5.11 Chapter 5

13. Envelope of control characteristics,), of a fully controlled three-phase ac voltage controller Fig. 5.12 Chapter 5

14. Envelope of control characteristics, ), of a fully controlled three-phase ac voltage controller Fig. 5.13 Chapter 5

15. Three-phase ac voltage controllers connected before the load: (a) half-controlled, (b) delta-connected Fig. 5.14 Chapter 5

16. Three-phase ac voltage controllers connected after the load: (a) wye-connected, (b) delta-connected Fig. 5.15 Chapter 5

17. Three-phase four-wire ac voltage controller Fig. 5.16 Chapter 5

18. Single-phase ac chopper with an input filter Fig. 5.17 Chapter 5

19. Waveforms of voltages and currents in a single-phase ac chopper: (a) output voltage and current, (b) input voltage and current after the input filter, and the fundamental output current Fig. 5.18 Chapter 5

20. Control characteristic of an ac chopper Fig. 5.19 Chapter 5

21. Wye-connected three-phase ac choppers: (a) three-wire, (b) four wire Fig. 5.20 Chapter 5

22. Delta-connected three-phase ac chopper Fig. 5.21 Chapter 5

23. Changes in the firing angle in a cycloconverter Fig. 5.22 Chapter 5

24. Output voltage waveforms in a six-pulse cycloconverter: (a) M = 1, (b) M = 0.5 ( Fig. 5.23 Chapter 5

25. Three-phase three-pulse cycloconverter Fig. 5.24 Chapter 5

26. Three-phase six-pulsecycloconverter with isolated phase loads Fig. 5.25 Chapter 5

27. Three-phase six-pulse cycloconverter with interconnected phase loads Fig. 5.26 Chapter 5

28. Three-phase to three-phase (3-3) matrix converter Fig. 5.27 Chapter 5

29. Arrangement of 3-1 and 1-3 matrix converters, equivalent to a 3-3 matrix converter Fig. 5.28 Chapter 5

30. State AAB as realized by activation od switches in (a) virtual rectifier and inverter, (b) matrix converter Fig. 5-29 Chapter 5

31. Reference current vector in the vector space of input currents of the virtual rectifier Fig. 5-30 Chapter 5

32. Reference voltage vector in the vector space of line-to-neutral output voltages of the virtual inverter Fig. 5-31 Chapter 5

33. Chapter 5

34. Output voltage and current waveforms in a 3-3 matrix converter: (a) N = 48, m = 0.7, (b) N = 12, m = 0.35, Fig. 5-32 Chapter 5

35. Bidirectional semiconductor power switches: (a) two IGBTs and two diodes, (b) one IGBT and four diodes Fig. 5-33 Chapter 5

36. Chapter 5

37. Switching signals for individual switches in a matrix converter in Example 5.4 Fig. 5-34 Chapter 5