1. Seminar on Improved Power Quality AC-DC Converters with High Frequency Transformer Isolation
By Prof. Bhim Singh Department of Electrical Engineering Indian Institute of Technology Delhi Hauz Khas, New Delhi , India Ph.: (91)

2. Classification

3. Improved Power Quality AC-DC Converters with High Frequency Transformer Isolation
The control of DC-DC converter is done such as the input current wave shaping is achieved for AC-DC Diode converter.
The DC-DC converter can be operated in both DCM and CCM mode.
The control technique for DCM and CCM are different.
It works as voltage follower in DCM mode and there is no need of input voltage & current sensing for power factor correction.

4. Applications Lighting such as ballasts, CFL etc. DC Power Supplies,
Telecommunication Power Supply,
Improved Power Factor ballast,
Power Supplies for equipments like computers, medical equipments, printers, scanners etc.
Drives Applications with Power Factor Improvement at AC side,
Electrical Welding,
Lighting such as ballasts, CFL etc.

5. Single-Phase Buck Boost Flyback AC-DC Converter

6. Single-Phase Buck Forward AC-DC Converter

7. Single-Phase Buck Push-Pull AC-DC Converter

8. Single-Phase Buck Half-Bridge AC-DC Converter

9. Single-Phase Buck Full Bridge AC-DC Converter

10. Single-Phase Boost Forward AC-DC Converter

11. Single-Phase Boost Push-Pull AC-DC Converter

12. Single-Phase Boost Half-Bridge AC-DC Converter

13. Single-Phase Boost Full Bridge AC-DC Converter

14. Single-Phase Buck-Boost Cuk AC-DC Converter

15. Single-Phase Buck-Boost SEPIC AC-DC Converter

16. Single-Phase Buck-Boost Zeta AC-DC Converter

17. Single-phase buck-boost flyback AC-DC converter in DCM

18. Single-Phase Buck Boost Flyback AC-DC Converter Average current mode control in CCM operation

19. Single-Phase Buck Boost Flyback AC-DC Converter FLYBACK Converter in DCM

20. Single-Phase Buck Boost Flyback AC-DC Converter Design of Flyback Converter in DCM

21. Single-Phase Buck Boost Flyback AC-DC Converter Design of Flyback Converter in DCM

22. Single-Phase Buck Boost Flyback AC-DC Converter Design of Flyback Converter in DCM

23. Single-Phase Buck Boost Flyback AC-DC Converter Design of Flyback Converter in DCM and CCM

24. Single-Phase Buck Boost Flyback AC-DC Converter Design of Flyback Converter in DCM and CCM

25. Single-Phase Buck Boost Flyback AC-DC Converter Design of Flyback Converter in DCM and CCM

26. Single-Phase Buck Boost Flyback AC-DC Converter Specifications

27. Single-Phase Buck Boost Flyback AC-DC Converter
Source voltage and current in DCM at 100% load
Steady state output voltage in DCM at 100% load

28. Single-Phase Buck Boost Flyback AC-DC Converter
Source voltage and current in CCM at 100% load
Steady state output voltage in CCM at 100% load

29. Single-Phase Buck Boost Flyback AC-DC Converter
TABLE I
Comparisons of Flyback Converter Operation in DCM and CCM
Quantity
DCM Operation
CCM Operation
10% Load
100% Load
Input Current THD
12%
5.1%
11%
4.4% PF
0.981
0.997
0.989
0.998
Output Ripple
0.55%
1.73%
0.52%
1.45%
Normalized Current of Switch
(pu)
Peak
25.1
6.73
6.53
2.60
Average
0.93
0.71
0.54
0.67
RMS
2.87
1.62
1.35
1.14
Normalized Current of Diode
14.5
9.76
10.13
3.95
1.13
1.48
1.29
1.16
5.27
2.86
2.57
1.90
Control Technique
Voltage Mode Control
Average Current Control
Size of Converter
Small
Large
Circuit Simplicity
Simple
Complex

30. Single-Phase Buck Boost Flyback AC-DC Converter
Vs (V),
is(A)
Vdc (V)
Idc (A)
Test results of AC mains voltage, AC mains current, output DC voltage and output DC current waveform of AC-DC flyback converter for load perturbation response on equivalent resistive load (60W to 200W to 60W). (Scale on X-axis 1div=20ms, Y-axis channel-1 1div =85V, channel-2 1div =5A, channel-3 1div= 100V, channel-4 1div= 2A)

31. Single-Phase Buck-Boost Cuk AC-DC Converter in DCM

32. Single-Phase Cuk AC-DC Converter Inductors voltage and current waveforms in DCM

33. Single-Phase Cuk AC-DC Converter CCM operation

34. Single-Phase Cuk AC-DC Converter Inductors voltage and current waveforms in CCM

35. Single-Phase Cuk AC-DC Converter in DCM Operation

36. Single-Phase Cuk AC-DC Converter in DCM

37. Single-Phase Cuk AC-DC Converter in DCM

38. Single-Phase Cuk AC-DC Converter in DCM

39. Single-Phase Cuk AC-DC Converter Average and peak currents in the semiconductors and input inductor

40. Single-Phase Cuk AC-DC Converter Average and peak currents in the semiconductors and input inductor

41. Single-Phase Cuk AC-DC Converter Design Description in DCM and CCM

42. Design Description in DCM and CCM

43. Design Description in DCM and CCM

44. Design Description in DCM and CCM

45. Single-Phase Cuk AC-DC Converter Specifications

46. Single-Phase Buck-Boost Cuk AC-DC Converter
Source voltage and current in DCM at 100% load
Steady state output voltage in DCM at 100% load

47. Single-Phase Buck-Boost Cuk AC-DC Converter
Source voltage and current for 100% load in CCM
Steady state output voltage in CCM at 100% load

48. Single-Phase Buck-Boost Cuk AC-DC Converter
TABLE I
Comparisons of Cuk Converter Operation in DCM and CCM at Full Load
Quantity
DCM Operation
CCM Operation
Input Current THD
5.5%
3.8% PF
0.998 to 1.0
to 1.0
Ripple Factor
1.83%
1.67%
Peak Current Through Device
170A
60A
Control Technique
Voltage Mode Control
Average Current Control
Size of Converter
Small
Large
Circuit Simplicity
Simple
Complex

49. Single-Phase Buck-Boost Cuk AC-DC Converter
Vs (V), is(A)
Vdc (V)
Idc (A)
Test results of AC mains voltage, AC mains current, output DC voltage and output DC current waveform of AC-DC cuk converter for load perturbation response on equivalent resistive load (60W to 200W to 60W). (Scale on X-axis 1div=20ms, Y-axis channel-1 1div =175V, channel-2 1div =5A, channel-3 1div= 100V, channel-4 1div= 1.75A)

50. Single-Phase SEPIC AC-DC Converter in DCM

51. Single-Phase SEPIC AC-DC Converter in DCM

52. Single-Phase SEPIC AC-DC Converter in CCM

53. Single-Phase SEPIC AC-DC Converter in CCM

54. Single-Phase SEPIC AC-DC Converter Specifications

55. Single-Phase SEPIC AC-DC Converter in DCM
Source voltage and current in DCM at 100% load
Steady state output voltage in DCM at 100% load

56. Single-Phase SEPIC AC-DC Converter in CCM
Source voltage and current in CCM at 100% load
Steady state output voltage in CCM at 100% load

57. Single-Phase SEPIC AC-DC Converter
TABLE I
Comparisons of SEPIC Converter Operation in DCM and CCM
Quantity
DCM Operation
CCM Operation
10% Load
100% Load
Input Current THD
10% 6%
3.8%
8.5% PF
0.994
0.997
0.998
0.995
Output Ripple
0.22%
1.27%
1.1%
0.1%
Normalized Current of Switch
Peak
14.50pu
9.84pu
3.24pu
3.14pu
Average
0.76pu
0.77pu
0.71pu
0.78pu
RMS
4.60pu
2.18pu
1.50pu
1.39pu
Normalized Current of Diode
15.2pu
10.94pu
3.17pu
3.15pu
1.47pu
1.27pu
0.93pu
0.98pu
7.22pu
3.34pu
1.68pu
1.56pu
Control Technique
Voltage Mode Control
Average Current Control
Size of Converter
Small
Large
Circuit Simplicity
Simple
Complex

58. Single-Phase SEPIC AC-DC Converter
Vs (V), is(A)
Vdc (V)
Idc (A)
Test results of AC mains voltage, AC mains current, output DC voltage and output DC current waveform of AC-DC sepic converter for load perturbation response on equivalent resistive load (60W to 200W to 60W). (Scale on X-axis 1div=20ms, Y-axis channel-1 1div =150V, channel-2 1div =5A, channel-3 1div= 100V, channel-4 1div= 1.75A)

59. Single-Phase Buck-Boost Zeta AC-DC Converter in DCM

60. Single-Phase Buck-Boost Zeta AC-DC Converter in DCM

61. Single-Phase Buck-Boost Zeta AC-DC Converter in CCM

62. Single-Phase Buck-Boost Zeta AC-DC Converter in CCM

63. Single-Phase Zeta AC-DC Converter Specifications

64. Single-Phase Buck-Boost Zeta AC-DC Converter in CCM
Source voltage and current in DCM at 100% load
Steady state output voltage in DCM at 100% load

65. Single-Phase Buck-Boost Zeta AC-DC Converter in CCM
Source voltage and current for 100% load in CCM
Steady state output voltage in CCM at 100% load

66. Single-Phase Zeta AC-DC Converter
Vs (V), is(A)
Vdc (V)
Idc (A)
Test results of AC mains voltage, AC mains current, output DC voltage and output DC current waveform of AC-DC zeta converter for load perturbation response on equivalent resistive load (60W to 200W to 60W). (Scale on X-axis 1div=20ms, Y-axis channel-1 1div =150V, channel-2 1div =3A, channel-3 1div= 100V, channel-4 1div= 1.75A)

67. Single-Phase Zeta AC-DC Converter
TABLE I
Comparisons of Zeta Converter Operation in DCM and CCM
Quantity
DCM Operation
CCM Operation
10% Load
100% Load
Input Current THD
11%
4.98%
9.2%
1.36% PF
0.993
0.9975
0.994
0.998
Output Ripple
0.62%
1.99%
0.67%
1.98%
Normalized Current of Switch
Peak
9.21
4.15
2.92
1.75
Average
0.92
1.01
0.45
0.62
RMS
2.15
1.71
1.04
0.95
Normalized Current of Diode
36.90
20.01
14.6
8.73
4.52
3.02
3.24
3.17
10.45
5.41
5.37
4.57
Control Technique
Voltage Mode Control
Average Current Control
Size of Converter
Small
Large
Circuit Simplicity
Simple
Complex

68. References
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