Three-Phase, Full-Bridge Rectifier
• Two groups with three diodes each
Copyright © 2003
by John Wiley & Sons, Inc.
1-1
Three-Phase, Full-Bridge Rectifier Waveforms
• Output current is
assumed to be dc
Copyright © 2003
by John Wiley & Sons, Inc.
1-2
Three-Phase, Full-Bridge Rectifier: Input
Line-Current
• Assuming output current to be purely dc and zero ac-side
inductance
Copyright © 2003
by John Wiley & Sons, Inc.
1-3
Three-Phase, Full-Bridge Rectifier
• Including the ac-side inductance
Copyright © 2003
by John Wiley & Sons, Inc.
1-4
3-Phase Rectifier: Current Commutation
• output
current is
assumed to be
purely dc
Copyright © 2003
by John Wiley & Sons, Inc.
1-5
Thyristor Converters
• Two-quadrant conversion
Copyright © 2003
by John Wiley & Sons, Inc.
1-6
Thyristors
• Semi-controlled device
• Latches ON by a gate-current pulse if forward biased
• Turns-off if current tries to reverse
Copyright © 2003
by John Wiley & Sons, Inc.
1-7
Primitive circuits
with thyristors
Copyright © 2003
by John Wiley & Sons, Inc.
1-8
Single-Phase Thyristor Converters
Copyright © 2003
by John Wiley & Sons, Inc.
1-9
Input Line-Current Waveforms
• Harmonics, power and reactive power
Copyright © 2003
by John Wiley & Sons, Inc.
1-10