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

2. Relationship of Power Electronics
4/20/2017

3. POWER ELECTRONICS TECHNOLOGY
As the technology for the power semiconductor devices and integrated
circuit develops, the potential for applications of power electronics become
wider. There are already many power semiconductor devices that are
commercially available, however, the development in this direction is continuing.
The power semiconductor devices or power electronic converter fall
generally into four categories :
-AC to DC Converter (Controlled Rectifier)
-DC to DC Converter (DC Chopper)
-AC to AC Converter (AC voltage regulator)
-DC to AC Converter (Inverter)
 The design of power electronics converter circuits requires design the
power and control circuits. The voltage and current harmonics that are generated by the power converters can be reduced or minimized with a proper choice of the control strategy.

4. Power Electronics Application
Power Electronics defined as the application of solid-state (devices) electronics for the control and conversion of electric power.
Power electronics have already found an important place in modern technology and are now used in a great variety of high-power product, including heat controls, light controls, electric motor control, power supplies, vehicle propulsion system and high voltage direct current (HVDC) systems.

5. POWER ELECTRONIC SWITCHING DEVICES
1.Uncontrolled turn on and off (Power Diode)
2.Controlled turn on uncontrolled turn off (Thyristors)
3.Controlled turn on and off characteristic (Power Transistor, BJT, MOSFET, GTO, IGBT)
4.Continuous gate signal requirement (BJT, MOSFET, IGBT)
5.Pulse gate requirement (SCR(Silicon-Controlled Rectifier) , GTO)
6.Bidirectional current capability (TRIAC)
7.Undirectionalcurrent capability (SCR, GTO, BJT, MOSFET, IGBT)

6. Diagram Block of Converters

7. Diode Rectifiers. A diode rectifier circuit converts AC voltage into a fixed DC voltage. The input voltage to rectifier could be either single phase or three phase.
AC to DC Converters. An AC to DC converter circuit can convert AC
voltage into a DC voltage. The DC output voltage can be controlled by varying the firing angle of the thyristors. The AC input voltage could be a single phase or three phase.
AC to AC Converters. This converters can convert from a fixed ac input voltage into variable AC output voltage. The output voltage is controlled by varying firing angle of TRIAC. These type converters are known as AC voltage regulators.
DC to DC Converters . These converters can converte a fixed DC input voltage into variable DC voltage or vice versa. The DC output voltage is controlled by varying of duty cycle.

14. 4/20/2017 14

28. Examples of Some Applications
4/20/2017

29. History of Power Electronics
4/20/2017

30. Types of Power Devices
4/20/2017

31. General Purposes Diodes
4/20/2017

32. Thyristors
4/20/2017

33. GTOs
4/20/2017

34. Power Ratings of Devices
4/20/2017

35. Ratings of Power Devices
4/20/2017

36. Devices Symbols and Characteristics
4/20/2017

37. Devices Symbols and Characteristics
4/20/2017

38. Applications of Power Devices
4/20/2017

39. Control Characteristics of Devices
4/20/2017

40. Control Characteristics of Devices
4/20/2017

41. Switching Characteristics
4/20/2017

42. Ideal Characteristics
4/20/2017

43. Voltage and Current Waveforms
4/20/2017

44. Diode Rectifiers
4/20/2017

45. Ac-dc Converter Input voltage AC to DC Converters
-Single phase, half wave AC to DC converter
Input voltage
Waveform of single-phase, half wave AC to DC converter α
Output average voltage :
rms value of Output voltage :

46. AC-DC Converter

47. 4/20/2017

48. 1. AC to DC Converters -Single phase, Full wave AC to DC converter
The average output voltage can be found from :
4/20/2017

49. AC to DC Converters Single phase, Full wave AC to DC converter
4/20/2017

50. 3 Phase Half-Wave Uncontrolled Rectifier with Inductive Load
4/20/2017

51. 3 Phase Half-Wave Uncontrolled Rectifier with Inductive Load
4/20/2017

52. 4/20/2017

53. Three Phase Controlled Rectifier with Resistive Load
4/20/2017

54. Three Phase Controlled Rectifier with Inductive Load
4/20/2017

55. 3 Phase Half-Wave Controlled Rectifier With Inductive Load
4/20/2017

56. 4/20/2017
AC to DC Converters -Three-phase, Half wave AC to DC converter with inductive load
If the phase voltage is : van= Vm Sin(wt). The
average output voltage for a continuous load current is :
4/20/2017

57. 4/20/2017

58. AC to DC Converters -Three-phase, Half wave AC to DC converter
4/20/2017

59. 4/20/2017

60. 4/20/2017

61. 4/20/2017

62. 4/20/2017

63. 4/20/2017

64. 4/20/2017

65. 4/20/2017

66. 4/20/2017

67. 4/20/2017

68. 4/20/2017

69. 4/20/2017

70. 4/20/2017
4/20/2017

71. 4/20/2017

72. 4/20/2017

73. 4/20/2017

74. 4/20/2017

75. 4/20/2017

76. 4/20/2017

77. 4/20/2017

78. 4/20/2017

79. 4/20/2017

80. 4/20/2017

81. 4/20/2017

82. 4/20/2017

83. 4/20/2017

84. 4/20/2017

85. 4/20/2017

86. AC-AC Converter
4/20/2017

87. IGBT in DC-DC Converter
4/20/2017

88. DC-AC Converter
4/20/2017

89. UPS System
4/20/2017

90. RMS Values of Waveforms
4/20/2017

91. RMS Values of Waveforms
4/20/2017

92. Power Converter System
4/20/2017

93. Drive System
4/20/2017

94. Smart Power System
4/20/2017

95. Summary
Power electronics uses low power electronics (ICs, microprocessors, controllers ), and switching power devices for power converter and/or processing from one form of power to another.
The characteristics of the power devices play a major role in the speed and effectiveness of the power conversion.
4/20/2017