EEL 4242 POWER ELECTRONICS

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EEL 4242POWER ELECTRONICS

• DIODE RECTIFIERS

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Single-Phase Half-wave Rectifier
Figure 3.1
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Input Waveforms
Figure 3.2
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Half-wave Rectifier with RL Load
Figure 3.3
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Full-Wave Rectifier (center-tapped)
Figure 3.5
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Full-Wave Bridge Rectifier
Figure 3.6
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Bridge Rectifier (motor load)
Figure 3.7
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Bridge Rectifier (RL load)
Figure 3.8
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Bridge Rectifier (RL load)

• Case 1 Continuous conduction, Io gt0
• Case 2 Discontinuous conduction, Io 0

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Bridge Rectifier (RL load)

• Case 1 Continuous conduction, Io gt0

• Case 2 Discontinuous conduction, Io 0

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Boundary of continuous and discontinuous
(single-phase)
Figure 3.9
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Multiphase Rectifiers
Figure 3.12
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Three-Phase Bridge Rectifier
Figure 3.13
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Waveforms and Conduction Times
Figure 3.14
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3-Phase Bridge Rectifier (RL Load)
Figure 3.15
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Three-Phase Bridge Rectifier (RL load)

• Case 1 Continuous conduction, Io gt0
• Case 2 Discontinuous conduction, Io 0

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Three-Phase Bridge (RL load)

• Case 1 Continuous conduction, Io gt0

• Case 2 Discontinuous conduction, Io 0

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Boundary of continuous and discontinuous
(three-phase)
Figure 3.16
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DC Filters
Figure 3.18
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AC Filters
Figure 3.19
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Single-Phase Rectifier with C-Filter
Figure 3.22
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Single-Phase Rectifier with C-Filter
Figure 3.22
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Output Voltage with C-Filter
Figure 3.26
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Effects of Source Inductances
Figure 3.27
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Summary

• Diode rectifiers convert an ac voltage to a dc
  voltage.

• The output voltage contain ripples which can be
  removed by filters.

• Depending on time constant of the load, the load
  current may be discontinuous.

• Line inductances cause overlap and reduce the
  effective dc output voltage.

• What was the major idea?

• What was the muddiest idea?